HomeMy WebLinkAbout03241 - Technical Information Report FINAL C O C TED TIR �
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� Techn�cal Informat�on Report
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Do Property Short Plat
125th Avenue S.E. and South of S.E. 173rd Place
King County, Washington
King County Project No. L01 S0053
Prepared for:
Xuyen Do
- --s-- 23241 — 109th Place S.E.
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FINAL ����'�� ' �'� p� Kent, WA 98031
DAT�: �� �� � � �-
�� December 10, 2002
p,ppROVED: Revised July 8, 2003
Our Job No. 7721
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� Technical Information Report
Do Property Short Plat
125th Avenue S.E. and South of S.E. 173rd Place
King County, Washington
King County Project No. L01 S0053
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1A���S� �5`���� �.� Xu en Do
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23241 — 109th Place S.E.
'��'�k� Kent, WA 98031
December 10, 2002
Revised July 8, 2003
Our Job No. 7721
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TABLE OF CONTENTS
1.0 PROJECT OVERVIEW
2.0 CONDTI'IONS AND REQUIItEMENTS SUMMARY I
3.0 OFF-SITE ANALYSIS I
4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN
A. Existing Site Hydrology
B. Developed Site Hydrology
C. Performance Standards
D. Flow Control System
E. Water Quality System
5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN
6.0 SPECIAL REPORTS AND STUDIES
7.0 OTHER PERMITS
8.0 ESC ANALYSIS AND DESIGN
9.0 BOND QUANTITIES,FACILTTY SUMMARIES,AND DECLARATION OF COVENANT
10.0 OPERATIONS AND MAINTENANCE MANUAL
EXHIBITS
EXHIBTT A Level 1 Off-Site Drainage Analysis
EXHIBIT B Detention System
EXHIBIT C Water Quality System
EXHIBTT D Conveyance System
EXHIBTT E Erosion and Sediment Control (ESC)Plan
FIGURES
FIGURE 1 Technical Information Report(TIR)Worksheet
FIGURE 2 Site Location '
FIGURE 3 Drainage Basins,Subbasins,and Site Characteristics
FIGURE 4 Soils '
FIGURE 5 Developed Conditions Basin Map ',
7721.014.doc
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1.0 PROJECT OVERVIEW
The proposed Do short plat property is approximately 0.78 acres within the southwest quarter of the
Southeast quarter in Section 28, Township 23 North, Range 5 East> Willamette Meridian, King
County, Washington. The property is near the intersection of S.E. 173rd Place and 125th Avenue
S.E. The enclosed Vicinity Map,Figure 2, depicts the approximate location of the project site.
The proposed project site includes an existing barn that will be demolished as part of the
development. The remainder of the property is covered in brush and grass. Along the southern
property line there is a maintained lawn from an adjacent property owner. The northem property
line is adjacent to an existing gravel drive. There are existing residences to the west. The
northwest comer of the property is the end of 125th Avenue S.E., which has its own catch basins
and conveyance system for drainage.
The existing topography of the site is such that the ground slopes toward the center of the property
and then east to a low point along the center of the property line. Drainage continues east down a
10 percent slope to a small existing pond, then through a driveway culvert and eventually reaches
Big Soos Creek appro�cimately one-third of a mile from the site. Slopes on site range from
relatively flat to up to 10 percent near the eastern property line. The existing site soils are
Alderwood type, which is considered gravelly, sandy loam.
The planned development for this site is four lots for single-family residences. It will include a
tract for access (future road corridor) and a tract for a detention/water quality vault. The storm
system after development will consist of surface drainage of the driveways and access road to a
catch basin at the south end of the road and conveyed to a detention/water quality vault in Tract B.
Each of the lots will also have a storm drain tightline to collect roof runoff and convey it to the road
pipe system and then to the vault. An infiltration evaluation was done as part of the Level 1 Off-
Site Drainage Analysis and infilvation was not considered feasible. Figure 3 depicts the project site
topography and drainage basin information. A Soils Map is also included as Figure 4.
There is some off-site drainage that is directed towards the project area. This azea has been
included in the detention calculations for the detention/water quality vault.
7721.014.doc
FIGURE 1
TECHNICAL INFORMATION ,
REPORT (TIR) WORKSHEET '
;
King County Department of Development and.Environmental Services
TECHNICAL tNFORMATION REPORT (TIR) WORKSHEET
Part 1 PROJECT OWNER AND Part 2 PROJECT LOCATiON AND
PRO.lECT ENGINEER DESCAIPTION
Project Owner Project Name
Hien Do, HoanQ Do, Bav Do nn prnTert3� �hnrt Plar
Address Location
23241 109th Place S.E. Township 23N
Kent, WA 98031
Phone Range 05E
(253) 850-0701
SW..}.,..._Section 28
Project Engineer SE�
Nathan Machiela
Company BarQhausen Consulr;ng
Address/Phone �����e��I'-6���'
Part 3 TYPE OF PERMIT Part 4 OTHER REVIEWS AND PERMITS �'
APPLICATION �
Subdivison DFW HPA Shoreline Management
X Short Subdivision COE 404 Rockery
Grading DOE Dam Safe Structural Vaults X
tY
Commercial FEMA Floodplain Other I�
Other COE Wetlands
Part 5 SITE COMMUNITY AND DRAINAGE BASIN
Community King County
Drainage Basin Soos Creek Basin
Part 6 SITE CHARACTERISTICS
River Floodplain
Wetlands
Stream
Seeps/Springs
Critical Stream Reach
High Groundwater Table
Depressions/Swales
Groundwater Recharge
Lake
Other
Steep Slopes
Part 7 SOILS
Soil Type Slopes Erosion Potentia! Erosive Velcoties �
AmC Alderwood � 10� T.nw
Additional Sheets Attached
Part 8 DEVELOPMENT�IMITATIONS
REFEF3ENCE LIMITATION/SITE CONSTRAINT
Ch.4—Downstream Analvsis
Additional Sheets Attached
Part 9 ESC REQUIREMENTS l}
MINIMUM ESC REC�UIREMENTS MINlMUM ESC REQUIREMENTS
DURING CONSTRUCTION AFTER CONSTRUCTION
Sedimentation Facilities X Stabilize Exposed Surface
X Siabilized Construction Entrance X Remove and Restore Temporary ESC Facilities
g Perimeter Runoff Control X C1ean and Remove All Silt and Debris
Clearing and Graing Restrictions X Ensure Operation of Permanent Facilities
Cover Practices Flag Limits of SAO and open space
X Construction Sequence preservation areas
Other Other
Part�0 SURFACE WATER SYSTEM
Grass Lined Tank Infiftration Method of Analysis
Channei X Vault Depression xr.uT�
X Pipe System Compensation/Mitigati
X Energy Dissapator Flow Dispersal on of Eliminated Site
Open Channet Stora e
Wetland Waiver 9
Dry Pond Stream Regional
Wet Pond Detention
Brief Description of System Operation A storm drain in the roadway collects
surface ru 9ff 3I1� � gP an�l rrnitac i t to a c�PtPnti nn f�atar
qua ity vault. Disc arge is to the natural discharge loca i �} �nd has
Facility Related Site Limitations roc�C ��ning.
Reference Facility Limitation
Part 11 STRUCTURAL ANALYSIS Part i2 EASEMENTSlfRACTS
X Cast in Place Vauft X Drainage Easement
Retaining I�Va(I Access Easement
Rockery>4' High Native Growth Protection Easement
Structural on Steep Slope X Tract I
Other Other
Part 13 SIGNATURE OF PROFESSIONAL ENGINEER
I or a civil engineer under my supervision my supervision have visited the site. Actual site
conditions as observed were incorporated into this worksheet and the attachments. To the best of
my knowledge the information provided here is accurate.
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AND SITE CHARACTERISTICS
EXISTING CONDITIONS BASIN MAP ��
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� QJIDE TO MAPPING UNITS
For a fu12 description of a mapping tmit, read both the description of the mapping �m it and that of the soil
series to xhich the mapping imit belongs. See table 6, page 70, for descriptions of woodland groups. Other
inforwation is given in tables as follows:
Acreage and extent, table 1, page 9. Town and country planning, table 4, page 57.
Engineering uses of the soi2s, tables 2 and 3, Recreational �es, table S, page 64.
pages 36 thrwgh 55. Estimated yields, table 7, page 79.
Noodland
Described Capability imit group
Map on
symbol Mapping imit page Symbol Page Symbol
Ag6 Aldeiwood gravel2y sandy loam, 0 to 6 percent slopes---------- 10 IVe-2 76 3d2
._AQC Aldeiwood ¢ravelly sandy loam. 6 to 15 nercent sloves--------- 8 IVe-2 76 3d1
AgD Aideneood graveliy sandy loam, 15 to 30 percent slopes-------- 10 VIe-2 78 3d1
AkF Aldeixood and Kitsap soils, very steep------------------------ 10 VIIe-1 78 2d1
AmB Arents, Aldeiwood materi al, 0 to 6 percent slopes 1/---------- 10 IVe-2 76 3d2
AmC Arents, Aldeiwood material, 6 to 15 percent slopes 1/--------- 10 IVe-2 76 3d2
An Arents, Everett material 1/---------------------------------- 11 IVs-1 77 3f3
BeC Beausite gravelly sandy loam, 6 to 15 percent slopes---------- 11 IVe-2 76 3d2
BeD Beausite gravelly sandy loam, l5 to 30 percent slopes--------- 12 VIe-2 78 3d1
BeF Beausite gravelly sandy Ioam, 40 to 75 percent slopes--------- 12 VIIe-1 78 3d1
Bh Bellingham silt loaa►------------------------------------------ 12 IIIw-2 76 3w2
Br Briscot siit loam--------------------------------------------- 13 IIw-2 75 3w1
Bu Buckley silt Ioam-------------------------------------------- 13 IIIx-2 76 4w1
(b Coastal beaches----------------------------------------------- 14 VIlIw-1 78 ---
Ea Earlmont silt loan-------------------------------------------- 14 IIw-2 75 3w2
Ed Edgexick fine sandy loam-------------------------------------- 15 IIIw-1 75 201
Ev6 Everett gravelly sandy loam, 0 to 5 percent slopes------------ I5 IVs-1 77 3f3
EvC Everett gravelly sandy loam, 5 to 15 percent slopes----------- 16 VIs-1 78 3f3
EvD Everett gravelly sandy loam, I5 to 30 percent slopes---------- 16 Vle-1 77 3f2
B,�C �Everett-Alde n+ood gravelly sandy loams, 6 to 15 percent
slopes------------------------------------------------------ 16 VIs-1 78 3f3
InA Indiar►ola loamy fine sand, 0 to 4 percent slopes-------------- 17 IVs-2 77 4s3
-�C Indianola loamy fine sand, 4 to 15 percent slopes------------- 16 IVs-2 77 4s3
�D Indiaz�ola loamy fine sand, 15 to 30 percent slopes------------ 17 VIe-1 76 4s2
�B Kitsap silt loan, 2 to 8 percent slopes----------------------- 17 IIIe-1 75 2d2
_.r�C Kitsap silt loam, 8 to 15 percent slopes--------------------- I8 IVe-1 76 2d2
KpD Kitsap silt loam, 15 to 30 percent slopes--------------------- 18 VIe-2 78 2d1
KsC Klaus gravelly loamy sand, 6 to 15 percent slopes------------- 18 VIs-1 78 3f1
Ma Pti xed alluvial land------------------------------------------- 18 VIw-2 78 201
NeC Neilton very gravelly loamy sand, 2 to 15 percent slopes------ 19 VIs-1 � 78 3f3
Ng Newberg silt loam--------------------------------------------- 19 IIw-1 74 201
T�c Nooksack silt loam-------------------------------------------- 20 IIw-1 74 201
No Nox�a sandy loam-------------------------------------------- 20 IIIw-3 76 3w2 -
Or Orcas peat---------------------------------------------------- 21 VIIIw-1 78 ---
Os Oridia silt loam---------------------------------------------- 21 IIM-2 75 3w1
OvC Ovall gravelly loam, 0 to 15 percent slopes------------------- 22 IVe-2 76 3d1
OvD Ovall gravelly loaa, 15 to 25 percent slopes------------------ 23 VIe-2 78 3d1
OvF Ovall gravelly loam, 40 to 75 percent slopes------------------ 23 VIIe-1 78 3d1
Pc Pilchuck loamry fine sand-------------------------------------- 23 VIw-1 78 2s1
Pk Pilchuck fine sandy loam-------------------------------------- 23 IVw-1 76 2s1
Pu Puget silty clay loam----------------------------------------- 24 IIIw-2 76 3w2
Py Puyallup fine sandy loam-------------------------------------- 24 IIw-1 74 201
RaC Ragnar fine sandy loam, 6 to 15 percent slopes---------------- 25 IVe-3 77 4s1
RaD Ragiar fine sandy loam, 15 to 25 percent slopes--------------- 26 VIe-2 78 4s1
RdC Ragnar-Indianola association, sloping: 1/---------------------- 26
Ragnar soil--------------------------------------------- -- IVe-3 77 4s1
Indianola soil------------------------------------------- -- IVs-2 77 4s3
RdE Ragnar-Indianola association, moderately steep: 1/------------ 26 -------- -- ---
Ragnar soil--------------------------------------------- -- VIe-2 78 4s1
Indianola soil------------------------------------------- -- VIe-1 77 4s2
� ' � U.S. GOVF]WMIIi'f PR7N1'II7G OFFICE:1977 O-�68-266
GUIDE TO MAPPING UNITS--Cantinued
Woodland
' Described Capability w►it group
Map �
symbol Mapping imit page 5ymbol Page Symbol
Re Renton silt 2oam-------------------------------------------- 26 IIIw-1 75 3v1
I� Riven�rash--------------------------------------------------- 27 VIIIw-1 78 ---
Sa Salal silt loazs--------------------------------------------- 27 IIw-1 74 201
Sh S�veaiaish silt loa�----------------------------------------- 27 IIw-2 75 3w1
Sk 5eattle muck------------------------------------------------ 28 IIw-3 75 ---
Sa Shalcar muck------------------------------------------------ 29 IIw-3 75 ---
Sn Si silt loam------------------------------------------------ 29 IIw-1 74 201
So Snohomish silt loam----------------------------------------- 30 IIw-2 75 3w2
Sr Snohonish silt loam, thick surface variant------------------ 31 IIN-2 75 3w2
Su Sv2tan silt loam-------------------------------------------- 31 IIw-1 74 3w1
Tu Tukwila �uck------------------------------------------------ 32 IIw-3 75 ---
UrLh�an land---------------------------------------------- 33 -------- -- ---
Wo Woodinville silt loam--------------------------------------- 33 IIw-2 75 3w2
1/ II
1he co�osition of these imits is more variable than that of the others in the Area, but it has been
controlled well enough to interpret for the expected use of the soils.
2.0 CONDITIONS AND
REQUIREMENTS SUMMARY
2.0 CONDITIONS AND REQUIREb�ENTS SUMMARY �
A. Title 19A
(1) The short subdivision shatl comply with all provisions of Title 19A.
(2) The final review process must be completed prior to recording of the short subdivision. II
The Department of Development and Environmental Services (DDES) strongly �,
recommends the Final ShoR Plat be submitted at least one year prior to the expiration
date of the project. The Final Short Plat submittal package includes: ,
(a) A surveyed map page (four sets), including lot area closure calculations; '
(b) Final health appro�al from the King County Health Department (different from
preliminary health approval);
(c) A current short plat certificate and supporting documents (easements,etc.);
(d) Payment of the Final Short Plat submittal fee; and
(e) A copy of this letter(preliminary approval letter).
(3) A licensed land surveyor shall prepare the final short subdivision documents. These
documents shall comply with all of the following conditions for final approval:
(a) All persons having an ownership interest in the subject property are required to
sign the final shoR subdivision.
(b) If modifications to the approved preliminary site plan (attached to preliminary
approval letter) are needed to accomplish engineering design or final short plat,
then a revised preliminary site plan shall be submitted to DDES for review and
approval. The revised site plans shall be submitted with the engineering plans or
the final short plat submittal.
B. Surface Water Management(KCC 9)
1998 King County Surface Water Design Manual(SWDM)
(1) This short subdivision proposal is subject to Full Drainage Review per section 1.1.2.3.
Final short subdivision approval shall require full compliance with drainage provisions
and storm drainage requirements of this section. Compliance may result in reducing the
number and/or location of lots shown on the approved preliminary short subdivision.
The conditions outlined below are site-specific drainage conditions:
(a) Core Requirement No. 1 —Discharge at the Natural Location
(b) Core Requirement No. 2—Off-Site Analysis
(c) Core Requirement No. 3—Flow Control
(d) Core Requirement No. 4—Conveyance System
(e) Core Requirement No. 5—Erosion & Sedimentation Control
7721.014.doc
(fl Core Requirement No. 6—Maintenance and Operation
(g) Core Requirement No. 7—Financial Guazantees&Liability
(h) Core Requirement No. 8—Water Quality
(i) Special Requirement No. 1 —Other Adopted Requirements
NOTES
KCC 16.82.150 D: Seasonal Clearing Restriction
SO 220: Significant Trees
For additional details,please see Sections 5 and 7 of this report
(2) A professional civil engineer licensed in the State of Washington shall prepare a
Technical Information Report and/or engineering plans per Chapter 2, of the 1998 King
County,Washington Surface Water Design Manual.
C. Health(KCC i
(1) This proj
if improvements are requir� from the Sewer and/or the Water llistrict, then
verification shall be required from said District(s) that the improvements have been
bonded and/or installed,prior to final recording of the short plat.
D. Road Standards(KCC 14)
1993 King County Road Standards,Ordinance 11187
Final short subdivision approval shall require full compliance with the provisions set forth in
the King County Road Standards (KCRS) including engineering plans for all road
improvements. The engineering plans shall be prepared by a professional civil engineer
licensed in the State of Washington. DDES strongly recommends the Engineering Plans be
submitted at least 2 years prior to the expiration date of the project. The following conditions
are road requirements for this short subdivision and shall be satisfied, unless a variance is
obtained.
(1) The off-site road (125th Avenue Southeast} shall be improved with 20 feet of
all-weather surface from Southeast 172nd Street to the development.
(2) ROW dedication is required for the 30-foot portion of Southeast 172nd Street as shown
on the revised site plan(KCRS Section 2.03).
(3) The existing cul-de-sac located at the south terminus of 125th Avenue Southeast shall
be widened to an 80-foot-diameter(KCRS Section 2.08).
(4) Private access to Lots 2 and 3 (Tract A) shall be a joint-use driveway tract (JUDT). The
tract shall be an undivided ownership to the lots it serves, and the lot owners shall be
responsible for its maintenance (KCRS Section 3.01). The tract shall be 20 feet wide
(minimum) with an 18-foot-wide paved surface. The tract shall be located as shown on
the revised site plan.
7721.014.doc
(5) Lot 1 shall be restricted from use of the Tract A. Access shall be from the dedicated
ROW,unless a variance is granted allowing the JUDT to serve 31ots.
(6) Tract D (a future access and utility tract) shall be owned by the owner (or future
owners) of Tract C. Additionally, it shall be for the benefit of Tax Lot 0043 (the
property to the south)at the time of future subdivision(KCC 19A.08.110).
(7) The following notes shall be shown on the final recorded short subdivision:
(a) Warning: King County has no responsibility to build, improve, maintain or
otherwise service the private roads contained within or providing service to the
property described in this short subdivision.
(b) All private tracts to be maintained, repaired, and/or rebuilt by the owners of the
parcels having legal access therefrom and their heirs, assigns or successors,
unless and until such roads are improved to King County standards and are
dedicated and accepted by King County for maintenance.
(8) All utilities within proposed rights-of-way shall be included within a franchise
approved by the King County Council prior to final short subdivision recording.
E. Building and Construction Standards(Title 1�
(1) The applicant shall comply with all applicable provisions of KCC 16.82.
F. Fire Code(KCC 17)
Seclion 902 of the 1997 Edition of Uniform Fire Code
As proposed, any future residences constructed on the lots �i�ithin this short plat will have to
be sprinklered NFPA 13D due to inadequate fire a}�; :
(1) If ALL of the following fire apparatus acces ,. ,. � . �, , �� ' t
the Uniform Fire Code (1997 addition) are being met, the sprinkler requirement can h�
removed.
(a} A minimum 20-foot-wide fire lane shall be provided so that no portion of an
exterior first story wall of the proposed residence is more than 150 feet (as a
person would walk) from an approved fire lane. An approved fue land cannot
exceed 150 feet in length without an approved fire apparatus turn-around
(80-foot-diameter cul-de-sac or "hammerhead") as outlined in Title 17 of the
King County Code. Specifically, this means that 125th Avenue SE and Tract "A"
must have minimum 20-foot driving surface widths, and that the cul-de-sac at the
south temvnus of I25th Avenue SE be a minimum of 80 feet in diameter.
(b) The fire lanes shall have an all-weather surface capable of 25 tons.
(c) Private access tracts shall be properly marked/signed as fire lanes as outlined in
the King County Code.
(d) No lot can be more than 350 feet (vehicular travel distance) from a fire hydrant
that delivers at least 1,000 gpm at 20 psi residual pressure. A King County Fire
��z�.oia.ao�
Engineering permit is required for fire hydrandwater main installation. If the lots
are designated "rural" they are exempt from fire hydranbfire flow requirements.
Fire hydrandfire flow requirements will be waived for residences sprinklered
NFPA 13D.
(2) If sprinklers are used,fire hydrant and fire flow requirements will be waived.
G. Zoning Code(KCC 21A)
(1) Density and Dimensions(KCC 21A.12)
All lots shalI meet the density and dimensions requirements of the R-12-SO and
R-18-SO zone classifications or shall be as shown on the face of the approved
preliminary short subdivision, whichever is larger. Minor revisions to the short
subdivision, which do not result in substantial changes and/or do not create additional
lots may be approved at the discretion of Land Use Services Division. NOTE: The
applicant requested a density waiver due to the stormwater detention and treatment
requirements and the base density requirements of the parcel based on the zoning.
Based on the applicant's analysis, a density waiver will be approved (21A.12.060.B)
due to the stormwater detention and treatment requirements for this parcel in this area.
Tract "C" as depicted on the preliminary short plat map shall be designated as Lot 4 on
the final short subdivision map with a note to the effect that a minimum of fow
dwelling units are required on lot 4 for future development unless a waiver of minimum
density is granted.
(2) P-Su�x Conditions(SO-220 Significant Trees)
"Pursuant to KCC 21A.38.230, an approved Significant Tree Retention Plan is required
to be provided along with the engineering plans for the final short plat. Any proposed
clearing, grading or construction activities that will or may impact a significant tree
within said lots must be reviewed and approved by King County Land Use Services
Division,or successor, for compliance with the Significant Tree Retention Plan, prior to
final engineering plan approval.
H. Road Mitigation Payment System
The applicant shall comply with Road Mitigation Payment System (MPS), by paying the
required MPS fee as determined by King County Department of Transportation, plus an
administrative fee. The applicant has an option to either:
(1) Pay the MPS fee at final short subdivision recording and the MPS administrative fee at
final short subdivision application,or
(2) Pay the MPS fee at building pernut issuance and the MPS administrative fee at the time
of building pernut application.
If option 1 is chosen,then the following note shaIl be shown on the final short plat:
MPS FEE NOTICE:
All fees required by King County Code 14.75, Mitigation Payment System have been
paid.
7721.014.doc
If option 2 is chosen,then the following note shall be shown on the final short plat:
MPS FEE NOTICE:
This short plat is subject to King County Code 14.75, King County Road Mitigation
Payment System. The MPS fees plus the MPS administrative fee shall be paid at the
time of building permit application at the rate in effect at that time.
I. State Environmental Policy Act(SEPA)
This short subdivision was considered under the provisions of the State Environmental Policy
Act(SEPA). A Determination of Non-Significance was issued on June 14,2002.
J. Other Considerations and Conditions
(1) Preliminary approval of this application dces not limit the applicant's responsibility to
obtain any required permit or license from the State or other regulatory body. This may
include,but not be limited to,obtaining a forest practice permit or an HPA Pernut.
(2) All restrictions, easements, tracts, and their purpose shall be shown on the final
recorded short subdivision.
(3) There are no known sensitive areas located on this proposal site.
This project is located within the Soos Creek Basin. In accordance with the Soos Creek Basin
Reconnaissance Summary Report, the roof drains from the houses on Lots 1 through 4 will be
tightlined to the storm drain system.
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7721.014.doc
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3.0 OFF-SITE ANALY5IS
A Level 1 Off-Site Drainage Analysis, dated August 16, 2001, and revised November 6, 2001, by
Barghausen Consulting Engineers, Inc., was done on this site and is included as Exhibit A.
7721.014.doc
4.0 FLOW CONTROL AND WATER
QUALITY FACILITY ANALYSIS AND DESIGN
�
4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN
A. Existing Site Hydrology
The proposed plat is approximately 0.78 acres. The existing drainage basin is 1.11 acres,
including 0.33 acres of off-site drainage. For modeling the e�cisting conditions, it was
assumed that 1.04 acres of the site was pervious till pasture and 0.07 acres was impervious
(the existing on-site barn and existing gravel drive). The total 1.11 acres of pre-developed
drainage area is based on site topography and includes the whole development and some
property to the north, west, and south. The site was assumed to drain to the low point at the
eastern property boundary. The existing basin map is included as Figure 3.
B. Developed Site Hydrology
The developed drainage basin is based on 0.78 acres of new development and 0.33 acres of
existing land. This includes 0.53 acres of impervious area (a roadway and four single-family
residences) and 0.58 acres of pervious landscaped areas. The four lots of the proposed plat
will each have a single-family residence, an adjacent driveway and the roadway access to the
lots make up approximately 23,000 square feet of impervious area. The ma�cimum buildable
area on each lot was assumed as 4,000 square feet for Lots 1, 3 and 4, in accordance with the
1998 King County, Washington Surface Water Design Manual (KCSWDM)for single-family I
lots. The maximum buildable area for Lot 2 was calculated at 3,571 square feet using the area
left after the required setbacks were used. The developed basin conditions are shown on I
Figure 5. '
C. Performance Standards
Based on existing conveyance system nuisance problems detailed in the Level 1 Off-Site
Drainage Analysis, this project will mitigate by providing Level 1 Flow Control, and adding
additional flow control such that the project will hold the 10-year peak to the overflow T�peak
matching the 10-year peak to the 2-year storm event pre-developed conditions peak. This
results in detaining approximately 5,325 cubic feet of runoff to reduce the flow from the
10-year developed condition rate of 0.208 cfs to the 2-year pre-developed rate of 0.062 cfs.
The conveyance system for this project was sized to transport the 25-year developed site
runoff to the detention vault. The rim of the proposed catch basin was set 2 feet above the
maximum high water surface of the vault to minimize the potential for flooding in a larger
storm event.
D. Flow Control System
The flow control system was designed using the KCRJS program. Refer to the drawing and
calculations of the detention system in Exhibit B. Because the detention system was sized to
reduce the 10-year developed peak flow to the 2-year predeveloped flow, a safety factor of 1.0
was used. An emergency overland overflow route between Lots 3 and 4 can be used to
convey runoff to the discharge point in case the detention/conveyance system is not operating
conectly.
n2�.o�a.a�
E. Water Quality System
Basic water quality Option 4—wet vault was chosen for this project. A drawing of the water
quality/detention system can be seen in Exhibit C. The residences in the proposed plat will
have the roofs of their homes tightlined to the storm drainage system and detention vault.
Therefore, the water quality system has been designed to treat runoff from the entire 1.11-acre
basin. The water quality requirements are integrated into the detention system, with the
requirement being met below the live storage volume. The bottom 4.15 feet of the proposed
detention/water quality vault will be for water quality including 1 foot for sediment storage.
Due to limited grades, a gravity drain for maintenance has not been included. For the
1.11-acre development, 3,165 cubic feet of water quality storage is required. This
development proposes a detention/water quality vault of 28 by 36 feet, and 3.15 feet of depth
for water quality. This amounts to 3,175 cubic feet of water quality, exceeding the
requirement.
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FIGURE 5
DEVELOPED CONDITIONS BASIN MAP
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�+.GH'4VS 18215 72ND AVENUE SOUTri °'"°'"0 "'"' �' T�`
T121 mQ' t�Z KENT, WA 98032 0,�.� � „,„�„�„ XUYEN DO DEVELOPED CONDITIONS
(425)251-6222 23241109TH PLACE S.E. BASIN MAP
SM�1 (i
(425)251-8782 FAX �"iMi°� �,_�
� KENT, WA 98031
s w��. �a�
s y. ����NE��N�.�o P�,N,N�, ,._z. DO PROPER?'Y
`<, �" sum�enr+c�ENVIRONMENTAL SERNCES �. - - (253) 850-0701
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5. CONVEYANCE SYSTEM
ANALYSIS AND DESIGN
5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN
The conveyance system for this project consists of 12-inch pipe along the east side of the roadway
to collect surface runoff and drainage from the roofs of the future residences. This 12-inch system
discharges into the proposed detention/water quality vault. The discharge from the detention/water
quality vault is also a 12-inch pipe. The minimum slope on the 12-inch system is 0.50 percent,
which will adequately convey the 100-year discharge of 0.305 cfs. See Exhibit D for a drawing of '
the conveyance system and pipe calculations.
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6.0 SPECIAL REPORTS AND STUDIES
6.0 SPECIAL REPORTS AND STUDIES
A Level 1 Off-Site Drainage Analysis, dated August 16, 2001, and revised November 6, 2001, has
been prepared for this site and is included as Exhibit A.
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7.0 OTHER PERMITS
A Notice of Intent (NOI) for an NPDES permit has been submitted to the Department of Ecology
for their review.
7721.014.doc
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18215 72ND AVENUE SOUTH oMq�w 16111 xoM � ��
7721 mP t�`Z KENT, WA 88032 0,,.� J([a ,��„��, XUYEN DO ROADWAY IMPROVEMENTS AND
� (425)251-8222
�..� � � (425)251-8782 FAX �^�^�� �'-��' 23241109TH P�ACE S.E
wT STORM DRAINAGE PLAN
4�(,�� �� p�r CML ENCINEERINC,UNO PUNNING, ���� �� KE1�11, WA 98031
�2 5 '"�eNa�NEe SURVfANG,FNVIRONMEMµSEFMCES �.u� (253) 850-07Q1 DO PROPER?'Y
�M1:P�07��jjy��Z �vn n.n Dol��O7/0!/jpp}_ly;j6 k�1�j0 nmo�Ai�lp Kr�l�: 177211.17771�.71721b.ho1.77721-p1. ,
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8.0 ESC ANALYSIS AND DESIGN
I
8.0 ESC ANALYSIS AND DESIGN '
Clearing Limits — The clearing limits for the road and utility construction has been designated on
the ESC Plan and is included as Exhibit D.
Cover Measures—Notes describing type and times of disturbed soil covers are included in the ESC
Plan. ',
Perimeter Protection — Silt fence will be installed downstream of all construction activity. There
will also be undisturbed vegetation adjacent to most of the construction areas that will filter runoff
prior to it leaving the site. Perimeter protection will be used as the primary treatment because site
slopes are less than 10 percent and flow path lengths are less than 250 feet.
Traffic Area Stabilization — Temporary constzvction entrances will be used to stabilize entrances
and reduce the amount of tracked sediment.
Sediment Retention — Sediment retention is not proposed for this site due to the limited amount of
area being distwbed during construction and due to the large amount of existing vegetation that can
filter the runoff prior to discharge from the site. Perimeter protection will be used as the primary
treatment.
Surface Water Controls — Due to the limited upstream basin size and small amount of disturbed
area during construction, surface water controls are not proposed for this project.
Dust Control — Dust convol measures (watering, covering, etc.) will be used during construction if 'I
a dust problem is encountered.
The erosion and sedimentation control measures shown on the ESC Plan represent measures to be
done during the road and utility construction phase of the development. Additional measures will
be required by individual lot owners during home construction. This includes individual
construction entrances, street inlet protection and silt fence along the street and on the low sides of
their property to prevent sediment-laden stormwater runoff from leaving their property.
ESC maintenance will be done by the conswction contractor during construction. Permanent
maintenance of the water quality vault will be provided by King County on an annual basis.
See Exhibit E for the Temporary Erosion Control Plan for this project.
7721.014.doc
9.0 BOND QUANTITIES, FACILITY SUMMARIES,
AND DECLARATIONS OF COVENANT
Site Improvement Bor , .� Quantity Worksheet
King County Department of Development & Environmental Services
900 Oakesdale Avenue Southwest
Renton, Washfngton 98055-1219
Project Name: Do Property Short Plat Date: 7/7/2003
Location: 125th Ave. S., Kinq County, WA Project No.: L01 S0053
Activity No.: L02SR085
Note: Ail prices include labor, equipment, materials, overhead and
Clearing greater than or equal to 5,000 board feet of timber? profit. Prices are from RS Means data adjusted for the Seattle area
or from local sources if not included in the RS Means database.
yes x no
If yes,
Forest Practice Permit Number:
(RCW 76.09)
Page 1 of 9
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Unit prices updated: 02/12/02
Version: 04/22/02
7721.017.x1s Report Date: 7/8/2003
Site Improvement Bo� �� Quantity Worksheet
_ unif : #ot _ ,
_. _
_ Refer�nce t# Prlce Uni# Quantit _ q }icatiions.....:: cnst '<
__ _ _ ............ __ _........
ER SfU{Vl��D1MENT CONTRCIL _ , , ,
,
_
Backiill &com action-embankment 5 5.62 CY
Check dams, 4"minus rock SWDM 5.4.6.3 $ 67.51 Each
Crushed surfacin 1 1/4" minus WSDOT 9-03.9 3 $ 85.45 CY
Ditchin $ 8.08 CY
Excavation-bulk � 1.50 CY 1000
Fence, silt SWDM 5.4.3.1 $ 1.38 LF 200
Fence, Tem ora NGPE $ 1.38 LF
H droseedin SWDM 5.4.2.4 $ 0.59 SY
Jute Mesh SWDM 5.4.2.2 $ 1.45 SY
Mulch, b hand, straw, 3"dee SWDM 5.4.2.1 $ 2.01 SY
Mulch, b machine, straw, 2"dee SWDM 5.4.2.1 $ 0.53 SY
Pi in ,tem ora , CPP, 6" $ 10J0 LF
Pi in ,tem ora , CPP, 8" $ 16.10 LF '
Pi in ,tem ora , CPP, 12" $ 20.70 LF
Plastic coverin ,6mm thick, sandba ed SWDM 5.4.2.3 $ 2.30 SY
Ri Ra , machine laced; slo es WSDOT 9-13.1 2 $ 39.08 CY
Rock Construction Entrance, 50'x15'xi' SWDM 5.4.4.1 $ 1,464.34 Each
Rock Construction Entrance, 100'x15'x1' SWDM 5.4.4.1 $ 2,928.68 Each 1
Sediment ond riser assembl SWDM 5.4.5.2 $ 1,949.38 Each
Sediment tra , 5' hi h berm SWDM 5.4.5.1 $ 17.91 LF
Sed.tra , 5'hi h, ri ra ped spillwa berm section SWDM 5.4.5.1 � 68.54 LF
Seedin , b hand SWDM 5.4.2.4 $ 0.51 SY
Soddin , 1"dee , level round SWDM 5.4.2.5 $ 6.03 SY
Soddin , 1"dee , slo ed round SWDM 5.4.2.5 $ 7.45 SY
TESC Su ervisor $ 74.75 HR
Water truck, dust control SWDM 5.4.7 $ 97.75 HR
1Mf;#TE-I�TEiUfS*•**',; t�: e �t;'�3 ' >,
_ _
_
Each
ESC SUBTOTAL: $ -
30%CONTINGENCY & MOBILIZATION: $ -
ESC TOTAL: $ -
COLUMN: A
Page 2 of 9
Unit prices updated: 02/12/02
Version: 04/22/02
7721.017.xis Report Date: 7/8/2003
Site Improvement Bc Quantity Worksheet
_ _ __ _ _ __ _ _
_ _ _ _ _ _ _ _ _ _ _ _
'' '` ` ;' ` '; EXisting Future Pubifc Private Duantity CamplBted <:
, ; ,;
> ' , __Right�oi-Way; poad lmprovements Impravements (Bond aeduction)•;
, . r ; ,' _ &Draina e Facilities Quant. .
' Unrt Pries'' Uni[ Quant. Cost Quant. Cos€ ' Quant, : Co�t ' 'Corri ete Cost >
__ ___ __ _ _
_ _____ __ __.... _ _ __ __ _____ __ ____ ____ ____ _._ _.._ ._.
�3 ; . " « ;r: I:: ,, ;
Backfill&Com action-embankment $ 5.62 CY
Backfill&Com action-trench $ 8.53 CY
Clear/Remove Brush,b hand $ 0.36 SY
Clearin Grubbin ree Removal $ 8,876.16 Acre
Excavation-bulk $ 1.50 CY
Excavation-Trench $ 4.06 CY
Fencin ,cedar,6'hi h $ 18.55 LF
Fencin chain link,vin I coated, 6'hi h $ 13.44 LF
Fencin ,chain link, ate,vin I coated, 20' $ 1,271.81 Each
Fencin lit rail,3'hi h $ 12.12 LF
Fill&com act-common barrow $ 22.57 CY 1200 27,084.00
Fill&com act- ravel base $ 25.48 CY
Fill&com act-screened to soil $ 37.85 CY
Gabion, 12"dee ,stone filled mesh $ 54.31 SY
Gabion, 18"dee ,stone filled mesh $ 74.85 SY
Gabion,36"dee ,stone filled mesh $ 132.48 SY
Gradin fine b hand $ 2.02 SY
Gradin ,fine,with rader $ 0.95 SY 1500 1,425.00
Monuments,3'lon $ 135.13 Each
Sensitive Areas Si n $ 2.88 Each
Soddin , 1'dee ,slo ed round $ 7.46 SY
Surve in ,line& rade $ 788.26 Da 2 1,576.52
Surve in ,lot location/lines $ 1,556.64 Acre 0.8 1,245.31
Traffic control crew 2 fla ers $ 85.18 HR
Trail,4"chi ed wood $ 7.59 SY
Trail,4"crushed cinder $ 8.33 SY
Trail,4"to course $ 8.19 SY
Wall, retainin ,concrete $ 44.16 SF
Wall, rocke $ 9.49 SF
Paye 3 of 9 SUBTOTAL 31,330.83
Unit rices u dated: 02/12/02 II
P P
`KCC 27A authorizes only ono bond reduction. VerslOtl: M22/02
772t.ot7.xls Report Date: 7/8/2003 �
Site Improvement Bc Quantity Worksheet
` !; !;..... ; '' ;;. .......':'.:. Exi&t[Itg . ; Flfltf[e pdbHc'' PCiuAt� ' " �iond£�eduction�' '
, _ _
;; Righi o�way:: > �Ivad#mpravements . .: 1m�rov�m�nts
&Dra#na e�'a�ilitlas: :Qaant.
Uni!F+rice: FliiiY Qiaant. G�isi Q�rant Cost Qu�nt< Cosi �m vte <�st
_ _ , _ _ , _ , _ _ .. _.....,.. _........ ......
AC Grindin ,4'wide machine< 1000s $ 23.00 SY
AC Grindin ,4'wide machine 1000-2000s $ 5.75 SY
AC Grindin ,4'wide machine>2000s $ 1.38 SY
AC RemovaVDis osaURe air $ 41.14 SY
Barricade, e I $ 30.03 LF
Barricade, e III Permanent $ 45.05 LF
Curb&Gutter, rolled $ 13.27 LF 520 6,900.40
Curb&Gutter,vertical $ 9.69 LF
Curb and Gutter,demolition and dis osal $ 13.58 LF
Curb,extruded as halt $ 2.44 LF
Curb,extruded concrete $ 2.56 LF
Sawcut,as halt,3"de th $ 1.85 LF 190 351.50
Sawcut,concrete, er 1"de th $ 1.69 LF
Sealant,as halt $ 0.99 LF 190 188.10
Shoulder,AC, see AC road unit rice $ - SY
Shoulder, ravel,4"thick $ 7.53 SY
Sidewalk,4"thick $ 30.52 SY
Sidewalk, 4"thick,demolition and dis osal $ 27.73 SY
Sidewalk, 5"thick $ 34.94 SY
Sidewalk, 5"thick,demolition and dis osal $ 34.65 SY
Si n, handica $ 85.28 Each
Stri in , er stall $ 5.82 Each
Stri in ,thermo lastic, for crosswalk $ 2.38 SF
Stri in ,4" reflectorized line $ 0.25 LF
Page 4 of 9 SUBTOTAI 7,440.00
Unit prices updated: 02/12/02
'KCC 27A authorizes only one bond reduction. Vel'siotl: 4/22/02
7721.o17.xls Report Date: 7/8/2003
Site Improvement Bc Quantity Worksheet
` a I ' �xisting ' ' ' �ulure Put��a.. ;! . Private Rond Reductiprt-
Rig�if•of•�eray Road tmpravements Ir�pr�vements I
_ ' ' &�raina e�aailiHes Quant ; I
Urut Pdr,� tJnit': Quarif. �osi f�u�rrt. Ccrst Quarit: Co�t Com efa '�st <
_ N .:;:: (� 4�ii�tc Z:�ba�e& t:,�"�oi�cQw��...>Far.93 I��RS(.6!5'..k�ou�k:.5°baae�I�.,;�i eaurs�} :,: .. ....:: ; '; I
For KCRS'93, additional 2.5"base add: $ 3.60 SY 505 1,818.00
AC Overla , 1.5"AC $ 7.39 SY
AC Overla ,2"AC $ 8.75 SY
AC Road,2",4" rock, First 2500 SY $ 17.24 SY 505 8 706.20 I
AC Road,2",4" rock,Q .over 2500SY $ 13.36 SY
AC Road,3",4"rock, First 2500 SY $ 19.69 SY
AC Road,3",4" rock,Q .over 2500 SY $ 15.81 SY �
AC Road,5",First 2500 SY $ 14.57 SY
AC Road,5" Q . Over 2500 SY $ 13.94 SY
AC Road,6",First 2500 SY $ 16.76 SY
AC Road,6",Q . Over 2500 SY $ 16.12 SY
As halt Treated Base,4"thick $ 921 SY
Gravel Road,4"rock, First 2500 SY $ 11.41 SY
Gravel Road 4` rock,Qt .over 2500 SY $ 7.53 SY
PCC Road,5", no base,over 2500 SY $ 21.51 SY
PCC Road, 6',no base,over 2500 SY $ 21.87 SY
Thickened Ed e $ 6.89 LF
Page 5 of 9 SUBTOTAL 10,524.20
Unit prices updated: 02/12/02
'KCC 27A authorizes only one bond reduction. Vefsioll: 4/22/02
�72�.o�7.xls Report Date: 7/8/2003
Site Improvement Bc l Quantity Worksheet �
_ _
> ,' .. ; _�xiating ', PuEut@ Pyh#la.:' ...... .: Prjvat� ;; �vnt!Reduction'
_ Right-o#-way Roud Itt�prou�ttt��s 'Improusments _
&Draina e�adlliti�s;: ': ' Q�anE :
_
lJn�t Pnc>e� l}nit Quant. CQst C?u�inl, ' �ask Quant< Cost G��m�tete Cc�st
,,.
,�{314�HACa� (�F'P=C'iOrttlgdi8d pl�9t3G piPB, E�E3;2 QC�qWIV2E611f3 :..... . :. FoiCutverf;n¢es Avara e o#�'c�erwas assum�d,Assume rtoral�:tl PVC is same nco as sotid i e
Acce�:s Ro��rl. R/D $ 16.74 SY
Bollards-fixed $ 240.74 Each
Bollards-removable $ 452.34 Each
' CBs include frame and lid
CB T e I $ 1,257.64 Each 4 5,030.56
CB T e IL $ 1 433.59 Each
CB T e II,48"diameter $ 2,033.57 Each
for additional de th over 4' $ 436.52 FT
CB T e II,54"diameter $ 2,192.54 Each
for additional de th over 4' $ 486.53 FT
CB T e II 60'diameter $ 2,351.52 Each
for additional de th over 4' $ 536.54 FT
CB T e II,72"diameter $ 3,212.64 Each
for additional de th over 4' $ 692.21 FT
Throu h-curb Inlet Framework Add $ 366.09 Each
Cleanout, PVC,4" $ 130.55 Each
Cleanout, PVC 6" $ 174.90 Each
Cleanout, PVC,8" $ 224.19 Each
Culvert,PVC,4" $ 8.64 LF
Culvert PVC,6" $ 12.60 LF
Culvert,PVC 8" $ 13.33 �F
Culvert,PVC, 12" $ 21.77 LF
Culvert,CMP 8" $ 17,25 LF
Culvert,CMP, 12" $ 26.45 LF
Culvert,CMP, 15" $ 32.73 LF
Culvert,CMP, 18" $ 37.74 LF
Culvert,CMP,24" $ 53.33 LF
Culvert,CMP,30" $ 71.45 LF
Culvert,CMP,36" $ 112.11 LF
Culvert,CMP,48" $ 140.83 LF
Culvert,CMP,60" $ 235.45 LF
Culvert,CMP,72" $ 302.58 LF
Paye 6 of 9 SUBTOTAL 5,030.56
Unit prices updated: 02/12/02
'KCC 27A authorizes only one bond reduction. Vefsloll: 4/22/02
7721.o17.xls Report Date: 7/8/2003
Site Improvement Bo � Quantity Worksheet
' " ` :L,x,ist#ng Future Pu61ic Private E3Ond F��c4[�CtlPil� .>
Right-af�way., ,' Road[n3provemerits Improvemsnta ' ` ;
, ;.
&Qrainage Facili6es Qu�nt, :
' Ut1tlPn�a;: Unil' QnaRt. ' CosF Quant. E;c�St Qu�tnt: Cost Gom ete <'�as�....:: ;:'
c
Culvert,Concrete,8" $ 21.02 LF
Culvert,Concrete, 12" $ 30.05 LF
Culvert,Concrete, 15" $ 37.34 LF
Culvert,Concrete, 18" $ 44.51 LF
Culvert,Concrete,24" $ 61.07 LF
Culvert,Concrete,30" $ 104.18 LF
Culvert,Concrete,36" $ 137.63 LF
Culvert Concrete,42" $ 158.42 LF
Culvert,Concrete,48" $ 175.94 LF
Culvert,CPP,6" $ 10.70 LF 38 406.6
Culvert,CPP 8" $ 16.10 LF 22 354.2
Culvert,CPP, 12" $ 20.70 LF 215 4450.5
Culvert,CPP, 15" $ 23.00 LF
Culvert,CPP, 18" $ 27.60 LF
Culvert CPP,24" $ 36.80 LF
Culvert,CPP,30" $ 48.30 LF
Culvert,CPP,36" $ 55.20 LF
Ditchin $ 8.08 CY
Flow Dis ersal Trench 1,436 base+ $ 25.99 LF
French Drain 3'de th $ 22.60 LF
Geotextile laid in trench, ol ro lene $ 2.40 SY
Infiltration ond testin $ 74.75 HR
Mid-tank Access Riser,48"dia 6'dee $ 1,605.40 Each 2 3210.8
Pond Overflow S illwa $ 14.01 SY
Restrictor/Oil Se arator, 12" $ 1,045.19 Each 1 1045.19
Restrictor/Oil Se arator, 15" $ 1,095.56 Each
Restrictor/Oil Se arator, 18" $ 1,146.16 Each
Ri ra , laced $ 39.08 CY 3 117.24
Tank End Reducer 36"diameter $ 1,000.50 Each
Trash Rack, 12" $ 211.97 Each 1 211.97
Trash Rack, 15" $ 237.27 Each
Trash Rack, 18" $ 268.89 Each
Trash Rack,21" $ 306.84 Each
Page 7 of 9 SUBTOTAL 9796.5
Unit prices updated: 02/12/02
'KCC 27A authorizes oniy one bond reduction. Ve�slOn: 4/22/02
7721.017.x1s Report Date: 7/8/2003
Site Improvement Bc � Quantity Worksheet
'; .. . ..:: ': ` " 'i II �xi�hng ' ' ; �utur�Pub3ic.:': i�tivate ' �ond F2eductip[�' '
,: _
; ' _ Right-of-wAy' Road Improvements !Im�trovsdienta
_ ,
d� Draina e Facilities <: ; ' QuanE.
i:
UnitPri�e__ Unit Qaan4. Ptiee Quant Cc�st' Quant: < Cost ' Gvm�tete �as! :<' >
� , , ' ;I
2"AC,2"to course rock&4"borrow $ 15.84 SY
2"AC, 1.5" to course& 2.5"base course $ 17.24 SY
4'select borrow $ 4.55 SY
1.5"to course rock&2.5'base course $ 11.41 SY
,,
� �E`!��+ :.; i: ..:;, "
Detention Vault $32 000.00 EA. 1 32000
EA.
LF
EA.
EA.
EA.
LF
SF
�F
LF
SUBTOTAL 32,000.00
SUBTOTAL(SUM ALL PAdES): 96,122.09
30%CONTINGENCY&MOBILI2ATION: 28,836.63
G RAN DTOTAL: 124,958.72
COLUMN: B C D E
Paye 8 of 9
Unit prices updated: 02/12/02
'KCC 27A authorizes only one bond reduction. Ve�Sio11: 4/22/02
772t.o�7.xls Report Date: 7/8/2003
Site I mprovement 6�� ..� Quantity Worksheet �
Original bond computations prepared by:
Name: Nathan Machiela �ate: 7!7/2003
PE Registration Number: 39372 Tel.#: 425.251.6222
Firm Name: Barghausen Consulting Engineers
Address: 18215 72nd Ave. South, Kent, WA 98032 Pro)ect No: L01 S0053 '
ROAD IMPROVEMENTS 8 DRAINAGE FACIUTIES FINANCIAL GUARANTEE REQUIREMENTS i
PERFORMANCE BOND' PUBLIC ROAD&DRAINAGE I
AMOUNT BOND'AMOUNT MAINTENANCE/DEFECT BOND'
REQUIRED AT RECORDING OR
Stabilization/Erosion Sediment Control (ESC) (A) $ - TEMPORARY OCCUPANCY'"'
Existing Right-of-Way Improvements (B) $ 124,958.7
Future Public Road Improvements& Drainage Facilities (C) $ -
Private Improvements (D) $ -
Calculated Quantity Completed (E) $ -
Total Right-of Way and/or Site Restoration Bond"/*' (A+B) $ 124,958.7
(First$7,500 of bond'shall be cash.)
Performance Bond` Amount (A+B+C+D) = TOTAL (T) $ 124,958.7 T x 0.30 $ 37,487.6 OR
mimum on amount is .
Reduced Performance Bond'Total *" (T-E) $ 124,958.7
Use larger o x o or - (B+C) x
Maintenance/Defect Bond'Total 0.25= $ 31,239.7
NAME OF PERSON PREPARING BOND'REDUCTION: N8th3t1 M3Chl@13 Date: 7/7/2003
'NOTE: The word"bond"as used in this document means any financial guarantee acceptable to King County.
`•NOTE: KCC 27A authorizes right of way and site restoration bonds to be combined when both are required.
The restoration requirement shall include the total cost for all TESC as a minimum,not a maximum. In addition,corrective work,both on-and off-site needs to be included.
Quantities shall reflect worse case scenarios not just minimum requirements. For example,if a salmonid stream may be damaged,some estimated costs for restoration
needs to be refiected in this amount. The 30%contingency and mobilization costs are computed in this quantity.
"'NOTE: Per KCC 27A,total bond amounts remaining after reduction shall not be less than 30%of the original amount(T)or as revised by major design changes.
SURETY BOND RIDER NOTE: If a bond rfder is used,minimum additional performance bond shall be $ - (C+D)-E
REQUIRED BOND'AMOUNTS ARE SUBJECT TO REVIEW AND MODIFICATION BY DDES
Page 9 of 9 Unit prices updated: 02/12/02
Version: 4/22/02
7�21.o17.xls Report Date: 7/8/2003
10.0 OPERATIONS AND MAINTENANCE '
MANUAL
10.0 OPERATIONS AND MAINTENANCE MANUAL
See attached Appendix A from the KCSWDM for maintenance standards for privately maintained
drainage facilities. �
7721.O14.doc
KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL
; APPENDIX A
MAINTENANCE STANDARDS FOR
PRIVATELY MAINTAINED DR.AINAGE FACILITIES
N0. 1 - DETENTION PONDS
Maintenance Defect Conditions When Maintenance Results Expected When
Component Is Needed Maintenance Is Pertortned
General Trash 8 Debris Any trash and debris which exceed 1 cubic foot Trash and debris deared from site.
per 1,000 square feet(this is about equal to the
amount ot trash it would take to fill up one
standard size office garbage can). In ge�eral,
there should be no visuai evidence of durnping.
Poisonous Vegetation My poisonous or nuisance vegetation whoch No danger of poisonous vegetation
may constitute a hazard to County personnet or where County persorxiel or the
the pubtia public might noRnapy be.
(Coordination with Seattle-K'mg
County Heatth Departrnen4}
Potlution Oi,gasoline,or other contaminants of one No contaminants present other than
gallon or more or any amount found that could: a surface film. (Coordination with
1)cause damage to plant,animal,or marine Irfe; Seattie/Kng County Heatth
2)constitute a fire hazard;or 3}be flushed Departrnent)
downstream during rain storms.
Unmowed Grass/ If facility is Iocated in private residential area, When mowing is needed,
Ground Cover mowing is needed when grass exceeds 18 grass/ground cover should be
� inches in heighL In other areas,the generat mowed to 2 inches in height
pdicy is to make the pond site match adjacent Mowing of selected higher use
ground cover and terrain as long as fhere is no areas rather than the entire sbpe
interference with the function of the facility. may be acceptable tor some
situations.
RodeM Hdes My evidence of rodent hdes if facility is acting RodenL�destroyed and dam or
as a dam or berm,or any evidence of water berm repaired. (Coordination with
piping through darn or berm via rodent holes. SeatUe/IGng County Health
Departrnent)
Insects When insects such as wasps and homets Insects destroyed or removed from
iMerfere with maintenance activities. site.
Tree Growlh Tree growth does not aflow maintenance access Trees do not hinder maintenance '
or interferes with maintenance activity(i.e.,slope activities. Selectively cultivate trees
mowing,siR removal,vactoring,or equipment such as alders for firewood.
moveme�ts). H trees are not interfering with
aocess,leave trees alone.
Side Slopes of Pond Erosion Eroded damage over 2 inches deep where Slopes should be stabilized by
cause of damage is still present or where there using appropriate erosion corhrol
is potential for continued erosion. measure(s);e.g.,rock
reinforcement,planting of grass,
compaction.
Storage Area Sediment Accumulated sediment that exceeds 10'/0 of the Sediment cleaned out to designed
designed pond depth. ponci shape and depth;pond
reseeded if necessary to contrd
erosion.
Pond D�Ces Settlements My part ot dike which has settled 4 inches lower Dike should be bu8t back to the
than the design elevation. design elevation.
Eme�gency Rock Missing Onty one layer of rock e�tists above native soil in Replace rocks to design standards.
Overflow/Spillway area frve square feet or larger,or any exposure
of native sa'I at the top of out flow path oi
spiqway. Rip-rap on inside slopes need not be
replaced.
1948 Surface Water Design Manual 9/1/98
A-1
APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAWTAINED DRAINAGE FACILPfIES
NO.4-CONTROL STRUCTURE/FLOW RESTRICTOR
Maintenance Defect Condition When Maintenance is Needed Results Expected When ��
Component Maintenance is Performed
General Trash and Debris Distance between debris buifd-up and bottom of All trash and debris removed.
(Includes Sediment) orifice plate is less than 1-1rL feet
Structural Damage Struclure is not securefy attached to manhole wall Structure securety attached to
and outlet pipe structure should support at teast wall and outlet pipe.
1,000 Ibs of up or down pressure.
Structure is not in upright position(allow up to Structure in correct position.
1 Q%from ptumb). i
Coruiections to outlet pipe are not watertight and Connections to outlet pipe are
show signs of rust. water tight;sUucture repaired or '
replaced and works as �I
designed. ;
My holes—other than designed holes--in the Structure has no holes ofher
stnicture. than designed holes_
Cleanout Gate Damaged or Missing Cleanout gate is not watertigM or is missing_ Gate is watertight and worics as
designed. '
Gate cannot be moved up and down by one Gate moves up and down easity I
maintenance person. and is watertight. i
Chain leading to gate is missing or damaged. Chain is in place and works as
designed. I
Gate is rusted over 50%of its surface area. Gate is repaired or replaced to
meet design standards.. ,
, Orifice Plate Damaged or Missing Contrd device is not working properly due to Plate is in place and works as �
missing,out ot place,or bent orifice plate. designed.
Obstructions Any trash,detrris,sedment,or vegetaUon Pfate is free of all obsVuctions
blocking the plate. and worics as designed.
Overflow Pipe Obslructions Arty trash or debris btocking(or having the Pipe is free of all obstructions
potential of bbcking)the overflow pipe_ and works as designed.
MaMole See"Closed Detention Systems"Standards No.3 See"Closed Detenfion Systerr�s'
Standards No.3
Catch Basin See°Catch Basins"Standards No.5 See'Catch Basins'Standards
No.5
l
9/1/98 1998 Sudace Water Design Manual
A-4
APPENDIX A MAINTENANCE STANDARDS FOR PRIVATFLY MAINTAINED DRAIlVAGE FACII_ITIES
NO. 5-CATCH BASINS
Maintenance Defect Conditions When�llaintenance is Needed Results Expected When
:� Compone�t Nfaintenance is pertormed
General Trash 8�Debris Trash or debris of more than 1/2 cubic toot which is No Trash or debris located
(InGudes Sediment) located immediately in front of the catch basin immec�ately in ftont of catch
opening or is blocking capacity of the basin by basin opening.
more than 10%
Trash or debris(in the basin)that exceeds 1!3 the No trash or debris in the catch
depth from the bottom ot basin to invert the lowest basin.
pipe into or out of the basin.
Trash or debris in arry iMet or outlet pipe biocking Inlet and oudet pipes free of
more than 1!3 of its height trash or debris.
Dead animals or vegetation ihat couki generate No dead animals or vegetation
odors that could cause complaints or dangerous present wiihin the catch basin.
gases(e.g.,methane).
Deposits of garbage exceedng 1 cubic foot in No conc�tion present which
volume would attract or support the
breeding of insects or rodents.
Structure Damage to Comer ot frame extends more than 3J4 inch past Frame is even with curb.
Frame and/or Top Slab curb face into the street(If appficable).
Top slab has holes lazger than 2 square inches or Top slatr is free of holes and
cracks wider than 1/4 inch(intent is to make sure cracks.
� all material is nxu�ing into basin).
Frame not sitting flush on top slab,i.e.,separation Frame is sitting flush on top
of more than 3/4 inch of the frame from the top slab.
slab.
Cracks in Basin Walls/ Cracks wider than 1/2 inch and longer than 3 feet, Basin replaced or repaired to
Bottom any evidence ot soil partides entering catch basin design standards.
through cracks,or maintenance person judges thai
structure is unsound.
Cracks wider than 1/2 inch and longer than 1 toot No ccacks more than 1/4 inch
at the joint of any iNeU outlet pipe or any evidence wide at the jant of inleVouBet
of soil partiGes entering qtch basin through pipe_
cracks.
SedimenU Basin has settled more ihan 1 inch or has rotated Basin replaced or repaired to
Misalignment more than 2 inches out of alignment. design standards.
1998 Surface Water Design Mannal 9/1/98
A-5
APPENDIX A MAII�PIENANCE STANDARDS FOR PRIVATELY MAWI'AINED DRAINAGE FACILITIFS
NO.5-CATCH BASINS(C�NTINUED� _
Maintenance Defect Conditions When Maintenance is Needed Resutts E�cpected When
Component Maintenance is pertormed ;�
Fire Hazard Presence of chemicals such as natural gas,oH and No flammable chemicais
gasdine. present.
Vegetation Vegetation growing across and blocking more than No vegetation blocking opening
10%of Uie basin opening. to basin.
Vegetation growing in inleVoutlet pipe joints ihat is No vegetation or root growth
more than six inches tall and less than six inches present.
��
Polfution tJonflammable chemicals of more�an 1/2 cubic foot No pollution present other ihan
per ihree feet of basin length. surface film.
Catch Basin Cover Cover Not in Pface' Cover is missing or only partialty in place.Any open Catch basin cover is closed
catch basin requires maintenance.
Locking Mechanism Mechanism cannot be opened by on maintenance Mechanism opens with proper
Not Working person with proper tools.Bolts into frame have less tools.
than 1!2 irxh of thread.
Cover Difficult to One maintenance person cannot remove lid after Cover can be removed by one
Remove applying 80 lbs.of fift;intent is keep cover from maintenance person.
sealing off access to maintenance.
Ladder Ladder Rungs Ladder is unsafe due to missing rungs,misalignment, Ladder meets design standards
Unsafe rust,cracks,or sharp edges. and albws maintenance person
safe access_
Metal Grates Grate with opening wider than 7/8 inch. Grate openirtg meets design
(If Applicable) standards.
� Trash and Debris Trash and debris that is blocking more than 20'/0 of Grate free of trash and debris_ ��
grate surface.
Damaged or Grate missing ar broken member(s)ot the grate_ Grate is in place arxi meets
Missing. design standards.
NO.6 DEBRIS BARRIERS(E.C.,TRASH RACKS)
Maintenance Defect Condition When Maintenance is Needed Results Expected When
ComponeMs Maintenance is Performed.
Generaf Trash and Debris Trash w debris that is plugging more than 20�/of Barrier clear to receive capaat}r
the openings in the barrier. flow.
Metal Damaged/Missing Bars are bent out of shape more than 3 inches. Bars in place with no bends more
Bars. than 3/4 inch.
Bars are missing or entire barrier missing. Bars in place according to
design.
Bars are loose and rust is causing 50%deterioration Repair or replace barrier to
to any part of barrier. design standards.
)
9/1198 1998 Sudace Water Design Manual
A-6
APPENDIX A MAIId'TENANCE SfANDARDS FOR PRiVATELY MAINTAINID DRAIIVAGE FACR,TPIES
NO.7-ENERGY DISSIPATERS �
Maintenance Defect Conditions When Maintenance is Needed Resutts Expected When
` Components Maintenance is Pertormed.
�
Extemai:
Rock Pad Missing or Moved On►y one layer of rock exists above native soil in Replace rocks to design
Rocic area five square feet or larger,or any exposure of standards.
native sal.
Dispersion Trench Pipe Plugged with Accumulated sediment that exceeds 209'a of the Pipe cleanedl flushed so that it
Sediment design depth. matches design.
Not Discharginq Visual evidence of water discharging at Trench must be redesigned or
Water Properly concentraled points along trench(nortnal condtion rebuiR to standards.
is a`sheet flov✓'of water along Vench).Intent is to
prever�t erosion damage.
Perforations Over 1/2 of perforations in pipe are plugged with Clean or replace periorated pipe.
Ptugged. debris and sediment.
Water Flows Out Mainienance person observes water flowing out Faaliry must be rebuilt or
Top of"Distributor� during any storm fess than the design st�rm or its redesigned to standards.
Catch Basin. causing or appears likely to cause damage.
Receiving Area Water in receiving area is causing or has potential No danger of landslides.
Over-Saturated of causing landstide problems.
tntemal:
Manhote/Chamber Wom or Damaged Structure d�ssipating flow deteriorates to 1/2 or Replace structure to design
Post.Baffles,Side original size or any concentrated wom spot standards.
of Chamber exceeding one square foot which would make
structure unsound.
Other Defects See'Catch Basins"Standard No.5 See'Catch Basins"Standard No.
t' 5 �
1998 Surface Water Design Manual 9/1/98
A-7
APPENDIX A MAINTENANCE STANDARDS FOR PRNATELY MAINfAINED DRAINAGE FACII..TIZF,S
NO.8-FENCING
Maintenance Detect CondRions When Maintenance is Needed Results F.�cpected When `�
Components Maintenance is Performed
C,enera! Missing or Broken My defect in the fence ihat permits easy entry Parts in place to provide adequate
Parts to a facility. security.
Erosion Erosion more than 4 inches high and 12-1 S No opening under the fence that
inches wide permitting an opening under a exceeds 4 inches in height
fence.
Wire Fences Damaged Parts Post out of plumb more than 6 inches. Post plumb to within 1-1/2 inches.
Top raits bent more than 6 inches_ Top rail hee of bends greater U�an
1 inch.
Any part of fence(ncluding post,top rails,and Fence is aligned and meeis design
fabric)more than t foot out o!design alignment. standards.
Missing or loose tension wire. Tension wire in place arxi holdng
fabric.
Missing w loose barbed wire that is sagging Barbed wire in place with less than
more than 2-1/2 inches between posts. 3/4 inch sag beiween post.
Extension arm missing,broken,or bent out of Extension arm in place with no
shape more than 1 1Y2 inches. berxis larger than 3J4 inch.
Deteriorated Paint or Part or parts that have a n�sting or scaling Structurally adequate posts or
Protective Coating conditlon that has affected structurat adequacy. parts with a un'rform protectinre
coating.
Openings in Fabric Openings in tabric are such that an 8-inch- No openings in fabric_
diameter ball couM fit through.
. �_�
NO.9-CATES
Maintenance Defect Conditions When Maintenance is Needed Results Expected When
Component Maintenance is Pertormed
General Damaged or Missing Missing gate or locking devices. Gates and Locking devices in
Members ptace.
Broken or missing hinges such ihat gate cannot Hinges intact arxl lubed.Gate is
be easily opened and Gosed by a maintenance working ireely.
person_
Gate is out of plumb more than 6 inches and Gate is aligned and vertical.
more than 1 foot out of design atignment
Missing stretcher bar,sVetcher bands,and ties. Stretcher bar,bands and ties in
place.
Openings in Fabric See"Fenang"Standard No.8 See"Fencing"Standard No.8
� II'
9/I/98 1998 Sudace Water Design Manual
A-8
APPENDIX A MAINTENANCE STANDARDS FOR PR]VATELY MAINTAINID DRAINAGE FACILiTIF.S
N0. 10-CONVEYANCE SYSTEMS(PIPES &DITCHES)
- Mainienance Defect Cond'iU'ons When Maintenance is Needed Resutts Expected When
Component Maintenance is Performed
Pipes Sediment&Debris Accumulated sediment that exceeds 20%of the Pipe cleaned of all sediment
diameter of the pipe. and debris.
Vegetation Vegetation that reduces free movement of water All vegetation removed so water
through pipes. flows freely through pipes.
Damaged Protective coating is damaged;rust is causing Pipe repaired or replaced.
� more than 50'/o deterioration to any part of pipe.
Any dent that decreases the cross section area ot Pipe repaired or replaced. �
pipe by more U►an 20%.
Open Ditches Trash 8�Debris Trash and debris exceeds 1 cubic foot per 1,000 Trash and debris cleared from
square feet of ditch and slopes. ditches.
Sediment Accumulated sediment that exceeds 20%of the Ditch deaned/flushed of all
design depth. sediment and debris so that it
matches design.
Vegetation Vegetation that reduces free movement of water Water flows freely through
through dftches. ditches.
Erosion Damage to See"Ponds'Standard No.1 See"Ponds"Standard No.1
Slopes
Rock Lining Out of Maintenance person can see native soil beneath Replace rocks to design
Place or Missing(It the rock lining. standards.
Applicable).
Catch Basins See"Catch Basins:Standard No.5 See'Catch Basins'Standard
No.5
�
' Debris Barriers See"Debris Barriers'Standard No.6 See"Debris Barriers'Standard
(e.g.,Trash Rack) No.6
N0.11 -GROUNDS(LANDSCAPING)
Maintenance Defect Condftions Wben Maintenance is Needed Results Expected When
Component Maintenance is Pertormed
General Weeds Weeds growing in more than 209'0 of the landscaped Weeds present in less than 59'0
(Nonpoisonous) area(trees and shn�s only). of the lar�dscaped area.
Safety Hazard Any presence of poison ivy or oiher poisonous No pasonous vegetation
vegetation. present in lar►dscaped area
Trash or Litter Paper,cans,bottles,totaling more than 1 cubic toot Area dear af litter.
within a larxlscaped area(trees and shrubs only)of
1,000 square feet
Trees and Shrubs Damaged Limbs or parts of trees or shrubs that are split or Trees and shrubs with less than
broken which affect more than 25%of the total 5%of total foliage with split or
foliage of the tree or shrub. broken limbs.
Trees or shrubs that have been blown down or Tree or shrub in place free of
knocked over. injury.
Trees or shrubs which are not adequately supported Tree or shrub'r»place and
or are{eaning over,causing exposure of the roots. adequately suppoRed;remove
any dead or diseased trees.
1998 Surface Water Design Manual 9/1/98
A-9
APPENDIX A MAII�TIENANCE STANDARDS FOR PRIVATELY MAINTAINID DRAINAGE FACILITIES
NO. 12-ACCESS ROADS/EASEMEM�S
, Maintenance Defect Condition When Maintenance is Needed Results Expected When --�
Component Maintenance is Performed
General 7rash and Debris Trash and debris exceeds 1 cubic foot per 1,000 Roadway free of debris which
square feet i.e.,trash and debris would fill up could damage tires_
one standards size garbage can.
Blocked Roadway Debris which could damage vehide tires(glass Roadway free of debris which
or metal). could damage tires.
Any obstruction which reduces clearance above Roadway overhead dear to 14 feet
road surface to less than 14 feet high.
Any obstn�ction restricting ihe access to a 1010 Obstruction removed to allow at
12 foot widih for a d'�stance of more than 12 feet least a 12 foot access.
or any point resficting access to tess than a 10
foot width.
Road Surface Settlement,Potholes, When any surface defect exceeds 6 inches in Road surface uniformly smooth
Mush Spots,Ruts depth and 6 square feet in area.In general,any with no evidence of settlement,
surface defect which hinders or prevents poMoles,mush spots,or ruts.
maintenance acxess.
Vegetation in Road Weeds growing in the road surface that are Raad surface free ot weeds taller
Surface more than 6 inches tall and less than 6 inches than 2 inches.
tall and less than 6 inches apart within a 400-
square foot area.
Modu{ar Grid Build-up of s�ment mildly contaminated with Removal of sediment and disposal
Pavement peVoleum hydrocarbons. in keeping with Health Departrnent
recommendations for mildly
contaminated soils or catch basin
sediments.
Shoutders and Erosion Damage Erosion within 1 foot ot the roadway more than 8 Shoulder free of erosion and
1"�
Ditches inches wide and 6 inches deep. matching the surrounding road. �
Weeds and Brush Weeds and brush exceed 18 inches in height or Weeds and brush cut to 2 inches
hinder maintenance access. in height or cleared in such a way
as to apow maintenance access.
I - .
I
i
I
I
�
9/1/98 1998 Surface Water Design Manual
A-10
APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILTITFS
N0. 13-WATER QUALfTY FACILft1ES
� _A.) Biofiltration Swale
Maintenance Defect Condition When Maintenance is Needed Results Expected When
Component Maintenance is Pertormed
BiofiRraOon swale Sediment Accumulation Sedment depth exceeds 2-inc�es No sediment deposits on grass
on Grass Layer layer of the bio-swale,which would
impede filtration of runoff.
Vegetation When the grass becomes excessively tatl Vegetation is mowed or nuisance
(greater than 10-inches);when nuisance weeds vegetation is eradicated,such that
and other vegetation starts to take over. flow not impeded.Grass should be
mowed to a height between 4
inches and 9 inches.
Inlet Outlet Pipe InIeU outlet pipe dogged with sediment and/or No clogging or blockage in the inlet
debris. and outlet piping.
Trash and Debris Trash and debris accumulated in the bio-swale. Trash and debris removed from
Accumulation bioswale.
Erosion/Scouring YVhere the bio-swale has eroded or scoured Bioswale should be re-graded and
the bottom due 4o flow channelization,or i�gher re-seeded to speafication,to
flows. eGminated channeled flow.
Overseeded when bare spots are
evident_
NO.y3-WATER(�UALITY FACILITIES(CONT/NUED�
B.} Grasslined Fitter Strips
Maintenance Defect Condition When Maintenance is Needed Results Expected When
; Component Maintenance is Perto►med
��
Flter 5trip Sediment Accumulation Sediment depth exceeds 2 inches. No sediment deposits on grass
on Grass Layer layer of the filter sfip,which would
�i impede filtration runoff.
Vegetation When the grass becomes excessively tall Vegetation is mowed or nuisance
, (greater than lo-inches);when nuisance weeds vegetation is eradiqted,such that
and other vegetation staris to take over. flow not impeded.Grass shoWd be
mowed to a height behn+een 4
inches and 9 inches.
Trash and Debris Trash and debris accumulated on the fdter Trash and Debris removed from
'. Accumulation sVip. fifter.
ErosioN Scouring Where the fifter strip has eroded or scoured Strip shou{d be re-graded and re-
due to flow channelization,or higher flows. seeded specification,to elirrrinate
channeled flow.Overseeded when
bare spots are evident
V-Notch Pipe Weir When the V-Notch pipe becomes damaged or Cleaned and properfy ftmctioning
clogged with sedimenU debris. weir,such that flows uniformly
spread.
I
il
I�� .
1998 Surface Water Design Manual 9/1/98
A-11
APPENDIX A MAINIENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAIIVAGE FAQLTITES !
_C�Wetponds
Maintenance Defect Condition When Maintenance is Needed Results Expected When
Component Maintenance is Performed �,/ � I
Wetpond Vegetation Vegetation such as grass and weeds need to be Vegetation should be mowed to
mowed when it starts to impede aesthetics of pond. 4 to 5 inches in height. Trees
Mowing is generally required when height exceeds and bushes should be removed
18-inches.Mowed vegetation shoutd be removed where they are interfering with
from areas where it could enter the pond,either pond maintenance activities.
when the pond level rises,or by rainfall runoff.
Trash and Debris Accumulabon that exceeds 1 CF per 1000-SF of Trash and debris remrned from
pond area. pond.
InIeU Outlet Pipe InIeU Outlei pipe dogged wiih�ment and/or No dogging or biockage in the
debris material. inlet and outlet piping_
Sediment Sediment accumulations in pond bottom that Removal of sedment from pond
Accumufation in Pond exceeds the depth of sediment zone plus 6-inches, bottom.
Bottom usualty the first ceU.
Oil Sheen on Water Prevatent and visible oil sheen_ Removal of sediment hom pond
bottom.
, Erosion Erosion of the pond's side sJopes and/or scouring of Slopes should be stabilized by I�
the pond bottom,that exceeds&inches,or where using proper erosion control
continued erosion is prevalenL measures,and repair methods.
Settlement of Pond Any part of these components that has settled 4- Dike/berm is repaired to
Dike/Berm inches or bwer than the design elevation,or specifications.
inspectw determines dike/berm is unsound.
Rodc Window Rodc window is clogged wRh sediment Window is free of s�ment and
debris.
. �'�Overflow Spillway Rock is missing and soil is exposed at top of Replace rocks to specification�
spillway or outside slope. �
1
�
9/1/98 1998 Surface Water Design Manual
A-12
EXHIBIT A
LEVEL 1 OFF-SITE DRAINAGE ANALYSIS
LEVEL ONE OFF-SITE DRAINAGE ANALYSIS
Proposed Do Short Plat
Southern Terminus of 125th Avenue S.E., North of Petrovitsky Road
King County, Washington
�� � -�o/ Prepared for:
���RYwAC�Bs Sue Ann Do, et al
ew��---��J�� 23241 109th Place S.E.
�
�
" Kent, WA 98031
t,
\n.2 G9 �-�
�'��-_.-_'..�`u
EY.PtflES i���o�d z_ August 16, 2001
Revised November 6, 2001
Our Job No. 7721
��'�Hq�s CIVIL ENGINEERING,LAND PLANNING,SURVEYING,ENVIRONMENTAL SERVICES
' : �� 18215 72ND AVENUE SOUTH,KErvr,WA 98032 • (425)251-6222 • {425)251-8782 F,ax
www.barghausen.com
� u
. `2
�i�����p,.
TABLE OF CONTENTS
TASK 1 STUDY AREA DEFINITION AND MAPS
EXHIBTI'A VICINITY MAP
EXHIBTI'B DOWNSTREAM DRAINAGE MAP
EXHIBTI'C UPSTREAM BASIN MAP
TASK 2 RESOURCE REVIEW i
EXHIBTI'D FEMA MAP
EXHIBTT E SENSTTIVE AREA FOLIOS I
EXI�BTI'F SCS SOIIS MAP AND INFQ.TRATION EVALUATION
EXHIBIT G ASSESSOR'S MAP
EXHIBIT H WETLAND INVENTORY MAP
EXHIBTT I BASIN RECONNAISSANCE SUMMARY REPORT
TASK 3 FIELD INSPECTION
EXHIBIT J OFF-S1TE ANALYSIS DRAINAGE SYSTEM TABLE
3.1 Conveyance System Nuisance Problems(Type 1)
3.2 Severe Erosion Problems(Type 2)
3.3 Severe Flooding Problems(Type 3)
TASK 4 DRAINAGE SYSTEM DESCRIP'I'ION AND PROBLEM DESCRIP`I'ION
EX�-�I'T K DRAINAGE COMPLAIN'I'S
TASK 5 MTI'IGATION OF EXISTING OR POTENTIAL PROBLEMS
TASK 1
STUDY AREA DEFINITION AND MAPS
TASK 1 STUDY AREA DEFINITIONS AND MAPS
The proposed Do short plat is approJcimately 0.78 acres located within a portion of the southwest
quarter of the southeast quarter of Section 28, Township 23 North, Range 5 East, Willamette
Meridian,King County,Washington. More specifically,the site is located at the southem terminus
of 125th Avenue S.E., appro�mately one lot north of S.E. Petrovitsky Road a.k.a. S.E. 176th
Street. The enclosed vicinity map, E�chibit A, depicts the approacimate location of the proposed
site.
The proposed project site has one existing building located on it in the north central portion of the
site which will be demolished with the development of the property. This building is
approximately 2,000 square feet and appears to be unused at this time. Mainly the property is
cleared or trees;however,there is brush and grass growing over the remainder of the property. The
property to the south consists of a lawn area whicb extends onto the subject property and the
property on the north is bound by gravel drive which forms the northem property boundary. There
are elcisting residences to the west and the northwest comer is the southem terminus of
125th Avenue S.E. which has its own catch basin collection and pipe conveyance system. Tbe
topography of the site is such that the ground slopes toward the center of the site and then off the
eastem property line of the site such that grades on the site are varied from relatively flat up to 10
percent near the eastem property line of the site. The proposal for this development is to short plat
the property into four separate lots for single-family residential development.
UPSTREAM DRAINAGE ANALYSIS
Based on our site visit, it appears that there is upstream flow onto and through the site. A small
portion of the lot to the south drains to the north onto the subject property which consists of
appro�cimately 0.15 acres of lawn azea. In addition,there is small portion of the front yard of a lot I
on the west side of the project that has 0.09 acres contributing runoff to the project site. This area I
consists of lawn area,as well. So there is a total upstream basin contributing to[he project site of I
approacimately 0.24 acres,and no detention exists for this runoff nor is water quality provided for I
this runoff other than the fact that all runoff from this azea passes through lawn or grass area. I
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y���r� � ¢�a� SUMEY�NC.�FJMROr�u�ENT�Lu5E1MCF5o, aio�io� "%" K@�t, WA 98031 KINC� COUNTY, WA3HINQTON
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TASK 2 RESOURCE REVIEW
• Adopted Basin Plans: The site is part of the Soos Creek Basin
• Finalize Drainage Studies: This is not applicable
• Basin Reconnaissance Summary Report: Once again, the site is located in the Soos Creek Basin. Part
of the Soos Creek Basin Reconoaissance Summary Report is to construct a proportional control weir and
berm in Boulevard Lane Park. The only coocern about this is that King County is worried that upstream
basin development is contributing to higher peak flows flowing through ihe upper reaches of Big Soos
Creek and they feel this berm and proportional control weir would mitigate upstream peak flows of
runoff. We are noi sure at this time if this project has been constructed yet.
• Critical Drainage Area Maps: According to the Water Quality Applications Map and the 1998 King
County Washington Surface Water Design Manual, basic water quality treatment is requued. Also,
according to the Flow Control Applications Map, also in the 1998 King Counry Washington Surface
Water Design Manual,Level 1 Flow Control is required as a minimum.
• Floodplain and Floodway FEMA Maps: Please see the enclosed FEMA map for this analysis. Panel No.
983 of 1,725, Map No. 53033C0983 F revised May 16, 1995. As indicated by this map,the proposed
project site dces not lie within a floodplain or floodway of a stream. Refer to Exhibit D FEMA map.
• Other Off-site Analysis Report: A review of Eachibit I,Basin Reconnaissance Summary Report,and the
site investigation work were conducted in prepazation of this Level 1 Drainage Analysis. The United
States Department of Agriculture Soils Conservation Service Map is also provided. See Exhibit F.
, • Sensirive Areas FoGos: Based on a review, the King County Sensitive Area Map Folios, it was found
that the subject site dces not lie within any sensitive areas. However,the site dces drain to a wetland area
as well as Big Soos Creek which is classified as a Class 2 Stream with salmonids less than one-half mile
from the site.
• Road Drainage Problems: This is not applicable.
• United States Department of Agriculture King County Soils Survey: Based on the soils map for this area,
the site is located in Alderwood type soils which is considered gravelly sandy loam.
• Wetland Inventory Maps: The Wetland Inventory Map for this area is included herewith,see Exhibit H
Soos Creek No.2 Wetland located in Section 33,Township 23 North,Range 5 East,also in the southeast
quarter of Section 28, Towuship 23 North, Range 5 East, Willamette Meridian, King County,
Washington. As shown on this map,the wetland is generally located oo the south side of S.E.Petrovitsky
Road and for the most part east of 124th Avenue S.E.
• Migrating River Studies: This is not applicable.
��2i.00�[Jp�ibyl
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LEGEND
SPECtAI FLOOD HAZARD AREAS INUNDATED
BY 100—YEAR FLOOD
ZONE A Nu bax Ikx�d clevati�nz delcrmincd. �
NATIONAL FL000 INSURANCE PROGRAM ZONE AE �a� �,� �..a�,.,��e���d. I,
ZONE AH FI«xl depths ot 1 to 3 (eet (uwaMy areas
��( pundir�l: base (kx�d eleva�icx�s
dcvenninecl.
ZONE AO Fla�d dcpths of t to 3 feci luwally �heM
fk�w on sloping terraink average depths
F I RM detM'Tu^ed F�r arcas of allwial(an fla�ding,
vekicities also det�Ymined.
FLOOD INSURANCE RATE MAP ZONE A99 T� � �.��,� <<�, ,�,��, �:� �,
Federal (kx�d praectiw� systcm under
caxlnxtion; no base el�watiurts de�ermined_
��� �0��`_' ZONE 4 Coaual floai with vclociry hazard Iwave
�l'i/ actwml: no base(I�wd clevations cletermirmd. i
WASHINGTON AND ZONE VE ��� � w,�ti ,�,� hazard �Wa„e '��
INCORPORATED AR,EAS �p°�` �'�` �"d e�,�"°'� ��."';"�_
FLOODWAY AREAS IN ZONE AE
� OTHER FLOOD AREAS I
PANEL 983 Of 1725 ZONE X .4cas of 500-year fbod: areas of 100-year ',
fla�d widl average tlepths of kss Nun i
ISEE MAP INDEX FOR PANELS NOT PRINTEO) 7 frwt or with dr�irwge ueu less than
1 square mile: and areas prdected by
le�res from lOP-year flood.
OTHER AREAS
ZONE X Areai determined to be outside 5 ear
CONTAINS: � �-Y '
COMMUN�TY NUMBER PANEL SUFFIX fl«�dplain.
ZONE D Areas in which flood huards ue
KI4G COUN7Y. unde[ermir.ed. ,
UNINCORPORA7ED AREAS 530071 0983 F
RENrori.arr oF s�ooee ose� F UNDEVELOPED COASTAL BARRIERS
� �\ \ •1�.�
Identified Identified (kherwise
1983 1990 RdMed nrex
Coastal barner areas are no�mally located wRhin or adjacenl to Special
Flood Hazard Areas.
Flood Boundary
MAPNUMB�R Fbodway Boundary
_ Zone D Boundary
53033C0983 F Boundary Drviding ��� F��d
Hazard Zones. and Boundary
MAP REVISED. Drviding Areas of DiHe�ent
�G��t,�,ti. Coastal Base flood Elevations
�G �� MAY 16, 1995 Withi� Spec�al ftood Nazard
w � Zones.
< � Base Flood Elevation Line:
�p � 513 Elevation in Feet. See Map Index
`�.r o r° tor Elevation Dalum.
- v v Goss Section One
Base Fbod Elevation e� Feet
Federal Emergency Management Agency �E� ��� wne�e u��+wm Within zo�e.
See Map Index for Elevation Datum.
RM7 X Elevation Re(erence Mark
� M2 River Mde
Horizontat Coordi�a[es Based on North
97°07'30", 32°22'30" nmerican Datum ot t927 (rvAD 2�1
Projection.
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'� �,��' NORTH
SOURCE: 1990 KING COUNTY SENSITIVE AREAS FOUO
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The site is Iocated on Page 5 of the
King County Sensitive Areas Map Folio.
There are no Coal Mine Hazard Areas
on Page 5.
� v2 0 �
MILE
�G�`�
- r � COAL MINE HAZARD AREAS
�,���' NORTH
SouacE: 1990 Kiric Covrvrv SENsrivE AR�s Fouo
II
I
EXHIBIT F
SCS SOILS MAP AND INFILTRATION
EVALUATION
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� QJIDE TO MAPPING UNITS •
For a full description of a mapping imit, read both the description of the mapping imit and that of the soil
series to which the mapping u�it belongs. See table 6, page 70, for descriptions of woodland groups. Other
infora�ation is given in tables as follows:
Acreage and extent, table 1, page 9. Town and country planning, table 4, page 57.
Engineering uses of the soils, tables 2 and 3, Recreational uses, table S, page 64.
pages 36 thraugh 55. Estimated yields, table 7, page 79.
Woodland �
Described Capability imit group j
Map on 'I
sy�bol Mapping imit page Symbol Page Symbol
Ag6 Aldeiwood gravelly sandy loam, 0 to 6 percent slopes---------- 10 IVe-2 76 3d2
AoC Aidexwood QravellY sandY loam, 6 to 15 �ercent slopes--------- 8 IVe-2 76 3d1 i
AgD Aidenaood gravelly sandy loam, 15 to 30 percent slopes------ 10 VIe-2 78 3d1
AkF Aldenaood and Kitsap soils, very steep------------------------ 10 VIIe-1 78 2d2
Am6 Arents, Aldeiwood material, 0 to 6 percent slopes 1/---------- 10 IVe-2 76 3d2
AmC Arents, Aldeiwood material, 6 to 15 percent slapes 1/--------- 10 IVe-2 76 3d2
An Arents, Everett material 1/----------------------------------- 11 IVs-1 77 3f3 �
BeC Beausite gravelly sandy 2oam, 6 to 15 percent slopes---------- 11 IVe-2 76 3d2 �
BeD Beausite gravelly sandy loam, 15 to 30 percent slopes--------- 12 VIe-2 78 3d1 I
BeF Beausite gravelly sandy loam, 40 to 75 percent slapes--------- 12 VIIe-1 78 3d1
Bh Belling3►am silt loam------------------------------------------ 12 IIIw-2 76 3w2
Br Briscot silt loam--------------------------------------------- 13 IIw-2 75 3w1 '
Bu Buckley silt loam-------------------------------------------- 13 IIIw-2 76 4w1 �
Cb Coastal beaches---------------------------------------------— 14 VIIIw-1 78 --- ��
Ea Earlmont silt loam------------------------------------------ 14 IIw-2 75 3w2
Ed Edgewick fine sandy loam-------------------------------------- 15 IIIw-1 75 201
Ev6 Everett gravelly sandy loam, 0 to 5 percent slopes------------ IS Ns-1 77 3f3
EvC Everett gravelly sandy loam, 5 to 15 percent slopes----------- 16 VIs-1 78 3f3
EvD £verett gravelly sandy loam, 15 to 30 percent slopes---------- 16 Vle-1 77 3f2
EwC �Everett-Aldeiwood graveily sandy loaa�s, 6 to 15 percent
slopes------------------------------------------------------ 16 VIs-1 78 3f3
InA Indianola loamy fine sand, 0 to 4 percent slopes-------------- 17 IVs-2 77 4s3
-nC Indianola loamy fine sand, 4 to 15 percent slopes------------- 16 IVs-2 77 4s3
l Indi�ola loamy fine sand, 15 to 30 percent slopes------------ 17 VIe-1 76 4s2
;d Kitsap siit loam, 2 Lo 8 percent slopes----------------------- 17 IIIe-1 75 2d2
KpC Kitsap silt loam, 8 to 15 percent slopes---------------------- 18 IVe-1 76 �d2
KpD Kitsap silt loam, 15 to 30 percent slopes--------------------- 18 VIe-2 78 2d1
KsC Klaus graveliy loamy sand, 6 to IS percent slopes------------- 18 VIs-1 78 3fl
Ma Mixed alluviai land---------------------------------------- 18 VIw-2 78 201
NeC Neilton very gravelly loamy sand, 2 to IS percent siopes------ 19 VIs-1 � 78 3f3
Ng Narberg silt loam--------------------------------------------- 19 IIw-1 74 201
FHc Nooksack silt loam-------------------------------------------- 20 IIw-1 74 201
No Noima sandy loam---------------------------------------------- 20 IIIw-3 76 3w2 -
Or Orcas peat--------------------------------------------------- 21 VIIIw-1 78 ---
Os Oridia silt 2oam---------------------------------------------- 21 IIK-2 75 3x1
OvC Ovall gravelly loam. 0 to 15 percent s2opes------------------- 22 Ne-2 76 3d1
QvD Ovall gravelly loam, 15 to 25 percent slopes------------------ 23 VIe-2 78 3d1
OvF Ovall gravelly loam, 40 to 75 percent slopes------------------ 23 VIIe-1 78 3d1
Pc Pilchuck loamy fine sand-------------------------------------- 23 VIw-1 78 2s1
Pk Pilchuck fine sandy loam------------------------------------- 23 IVw-1 76 2s1
Pu Puget silty clay loam----------------------------------------- 24 IIIx-2 76 3w2
Py Puyallup fine sandy loaao-------------------------------------- 24 IIw-1 74 201
RaC Ra�ar fine sandy loam, 6 to 15 percent slopes---------------- 25 IVe-3 �7 4s1
RaD Ragnar fine sandy loam, 15 to 25 percent slopes--------------- 26 VIe-2 78 4s1
RdC Ragnar-Indianola association, sloping: 1/---------------------- 26 -------- — ---
Ragnar soil--------------------------------------------- -- IVe-3 77 4s1
Indianola soil------------------------------------------- -- Ns-2 77 4s3
RdE Ragnar-Indianola association, moderately steep: 1/------------ 26 -------- -- ---
Ragnaz soil-------------------------------------------- -- VIe-2 78 4s1
Indianola soil----------------------------------------- -- VIe-1 77 4s2
� T � U. S. GOVERNMENT PRIIi7'777G O£FICE:1977 O-468-266
GUIDE TO MAPPING UNITS—Continued
Woodland
Described Capability iu►it group
Map on
-ymbol Mapping tmit page Symbol Page Symbol
Re Renton silt loam------------------------------------------=- 26 IIIN-1 75 3w1
ISi Riven�rash-------------------------------------------------- 27 VIIIw-1 78 --
Sa Salal silt Ioam--------------------------------------------- 27 IIw-1 74 201
Sh Sammamish silt loam----------------------------------------- 27 IIw-2 75 3w1
Sk Seattle muck------------------------------------------------ 28 IIx-3 75 ---
Sm Shalcar muck------------------------------------------------ 29 IIw-3 75 ---
Sn Si silt loam------------------------------------------------ 29 IIw-1 74 201
So Snohomish silt loam----------------------------------------- 30 IIw-2 75 3w2
Sr Snohomish silt loam, thick surface variant------------------ 31 IIw-2 75 3w2
Su Su2tan silt loam-------------------------------------------- 31 IIw-1 74 3w1
'hi Tukwila muck------------------------------------------------ 32 IIw-3 75 ---
UrUx�an land------------------------------------------------- 33 -------- -- ---
Wo Woodinville silt Ioam--------------------------------------- 33 IIw-2 75 3w2
1/
The co�osition of ihese imits is more variable than that of the others in the Area, but it has been
controlled well enou� to interpret for Lhe expected use of the soils.
Ii
I I�
• \ � • I � '
- Farth Consultants Inc.
� Geaecfinic.al Enginee�s.Geobgisis&Environmental ScierNisis
November 6, 2001 E-9900
Ms. Xu Yen Do
23241 — 109th Place Southeast
Kent, Washington 98031
Subject: Infiltration Evaluation
Do Short Plat
173XX—125"'Avenue Southeast
King County, Washington
Dear Ms. Do:
As requested, we are pleased to present this letter discussing the feasibility of infittrating
stormwate� from roof downspouts at the subject site. Based on the observed soil conditions and
on infiltration testing, in our opinion, infiltration does not appear to be feasible.
Site Conditions
We understand it is planned to subdivide an approximately 0.68-acre residential plat into three
residential lots with a fourth to be developed at a later date. The site is located southeast of an
existing cul�Je-sac in the 17300 block of 125th Avenue Southeast in an unincorporated portion of
King County (Plate 1).
Subsurface
Subsurface conditions were evaluated by excavating six test pits within the limits of the site. Four
of the test pits were excavated at the proposed infiltration locations determined by the project civil
engineering. Two additional test pits were excavated to further assess existing soil and
groundwater conditions in areas outside the proposed infiltration areas. The test pit locations are
shown on Plate 1. The test pits were excavated to a maximum depth of twelve (12} feet below
existing grade. Please refer to the test pit logs for a detailed description of the subsurface soil
conditions encountered at each test pit location.
At our test pit locations, we encountered a suficial layer of grass over topsoil. The topsoil and
vegetation layer was typically three to six inches thick. The topsoil and duff layer is characterized
by its dark brown color and the presence of abundant roots and organic debris.
Underlying the vegetation and topsoil layer we encountered five to ten feet of loose to dense fill.
The fill at our test pit locations was comprised of gravelly foam and silt loam with localized areas of
wood and miscellaneous household debris.
1805- 1361h Place N E.,Suite 201,Bellevue,Washingion 98005 Bellewe f425)6�13-37� FA�(425j 7�6-08E��� Tull Free(8E81739-6670
Ms. Xu Yen Do E-9900
November 6, 2001 Page 2
The underlying native soil consists of inedium dense to dense silt loam with oNy trace amounts of li
graveL ,
Groundwater '
Moderate to heavy groundwater seepage was encountered at four of the six test pit locations. In
Test Pits TP-2, TP-3, and TP-4 we encountered seepage at two and one half to six and one half
feet below existing grade. In Test Pit TP 5 we encountered heavy seepage at nine feet below
existing grade. In addition, mottled soils were encountered at widely varying depths at all of the
test pit loeations to the maximum depth explored. Test Pits TP-2, TP-3, and TP-5 were terminated
due to excessive seepage flowing into the excavation. The seepage is likely indicative of a
seasonal perched groundwater condition above the contact with the underlying medium dense to
dense, low permeability silt loam that was encountered.
Conclusions and Recommendations
The feasibility of infiltrating stormwater from the proposed development was assessed by
observing soil and groundwater conditions at the site. Additionally, textural analyses were
conducted on representative samples collected at our test pit locations. No infiltration tests were
conducted as part of our evaluation. In our opinion, due to the likely presence of up to ten (10)feet
of fill, a shallow, seasonal perched groundwater table, and low permeability soil within several feet
of the surface, infiltration of.runoff fram the roof downspouts does no# appear to be feasible.
We trust this information meets your current needs. If you have any questions, please call.
Respectfully submitted,
EARTH CONSULTANTS, INC.
__,�
���,c��K�YX���� ��-y
Mitchell G. McGinnis . Dinkelman, RPG
Project Geologist Project Manager
MGM/SDD�me
Attachments: Plate 1 Test Pit Location Plan
Earth Consultants, Inc.
TEST PIT LOGS
E-9900
TEST PIT TP-1 �I
Depth USCS U.S.D.A. Soii Classification I
0.0-0.3 Topsoii and Grass
0.3-2.5 ML Mottled brown, silt LOAM, medium dense, moist(Fill)
2.5-5.0 SM Reddish brown, silt LOAM, medium dense, moist (Possible Fill)
- 15.4 % moisture at 3.0 feet
5.0-8.5 SM Mottled brown, silt LOAM, dense, moist
TEST PIT TP-2
Depth USCS U.S.D.A. Soil Classification
0.0-0.3 Topsoil and Grass
0.3- 1.5 SM Mottled brown, silt LOAM, dense, moist(FiH)
- trace gravel
- 14.8% moisture at 1.0 foot
1.5-2.0 SP-SM Gray, coarse SAND, loose, wet(Fill)
- moderate seepage at 2.0 feet
2.0-5.0 SM Brown, silt LOAM, medium dense, moist (Fill)
- buried tire
5.0-9.0 SM Brown, silt LOAM, dense, moist
� - heavy seepage at 6.0 feet
- test pit terminated at 9.0 feet due to excessive seepage at 6 feet
� TEST PIT TP-3
i
� Depth USCS U.S.D.A. Soil Classification
0.0-0.5 Topsoil and Grass
0.5-3.5 SM Brown, gravelly LOAM, loose, moist(Fill)
- 12.3 % moisture content
- heavy seepage at 3.5 feet
3.5-7.0 SM Dark brown, LOAM, very loose, water bearing (Possible Fill)
- test pit terminated at 7.0 feet due to excessive seepage at 3.5
feet.
Earth Consultants,Inc.
TEST PIT TP-4
Depth USCS U.S.D.A. Soil Ciassification
0.0—0.5 Topsoil and Grass
0.5—4.5 SM Brown, gravelly LOAM, dense, moist (Filt)
- 9.6 % moisture
4.5—6.5 SM Blue gray, LOAM, medium dense, moist (Fill)
- contains organic debris
- 57.7% moisture
- light seepage at 6.5 feet
6.5—8.5 ML Mottled blue gray, silt LOAM, medium dense, moist
- trace small g�avel
TEST PIT TP-5
Depth USCS U.S_D.A. Soil Classification
0.0—0.3 Topsoil and Grass
0_3—6.0 SM Brown, LOAM, medium dense, moist (Fill}
6.0—9.5 ML Blue gray, silt LOAM with organics, medium dense, moist(Fill)
- contains abundant wood, plastic and miscellaneous household
debris.
- heavy seepage, becomes water bearing at 9.0 feet ,
9_5— 11.0 ML Blue gray, silt LOAM, medium dense, wet
- test pit terminated at 11 feet due to excessive seepage at 9 feet '
TEST PIT TP-6
Depth USCS U.S.D.A. Soil Classification
0.0—0.3 Topsoil and Grass ,
0.3—4.0 SM Brown, gravelly LOAM, toose to medium dense, moist (Fill} I
-buried concrete debris '
4.0— 10.0 ML Blue gray, silt LOAM, medium dense, moist(Fill) I
- contains box spring and miscellaneous household debris I
10.0— 10.5 ML Dark brown, silt LOAM with organics, loose, moist (Possible Buried
Topsoil)
10.5— 12.0 ML Blue gray, silt LOAM, medium dense, moist
-contains organics
Earth Consultants, Inc.
� �
� �
i �
� � i
, ----------- , Existing
--------------�� i
Q _____ Grave/Drive �' Cu/de Sac
i �---------_-—_ – _ � – �
� � - - - - -_ � _ _ _ - - i
I � � ' � �
I f II I I
Ir-- - - -- - - - - - -- - -- - - -I
+ �' TP-11 � �
' T ' '
� ,
I '
� TP-2� � � �
_ � i
` ' � � � Exisb�g TP-31 I
� Meta/Bdilding 3 i
� � T +
� I
( ; � �
i i
i
i i TP-5 i_ �
� �
,
i
� - - - , , I
-- - - - -
� - - - - --- -
_._ - -- - - -_"_—i— �
� I TP-6 TP-4 ( i
I � �
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� I
I
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i
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L _ _ �
— - - — - - — - - — - - — - - — - - —I
LEGEND
TP-1—�—Approximate Location of Approximate Scale
ECI Test Pit, Proj. No. 0 20 4o soft.
E-9900, Oct. 20Q1
Earth Consultants, Inc.
j '�. Subject Site Geo�echnical Engineers.Geologists 6 flmronmeroal Sciernisis
� Existing Building Test Pit Location Plan
Do Short Plat
� King County, Washington
�
�
i NOTE: This plate may contain areas of color. I
ECI cannot be responsible for any subsequent Drvvn. GLS Date Nov. 2001 Proj. No. 9900 �
misinterpretation of the information resulting ',
from black& white reproductions of this plate. Checked MGM Date 11/?J01 Plate 1 �
� I
EXHIBIT G
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EXHIBIT H
«'I;TI.�ND INVFNTOIZY '��7�����
� � er Ccdar River
Gre �,
v v
2�ry ''
o,�
. - 5 °r �� -
�� �
� $ 6 B�• �
, 9 �-
ac. "`
2
j� 15
75
� 16
20 � 23 81
Blaek River 25 24 27 62 Jenkins Creek
`�' 26 2 ��� 80
30
� SOOS 29
Creek �338�
E �98� -
5i 50 87 � �
s �
4S
52 � � �c�.
54 �
55 �
Lower Green River K�.4 58 CO�°n Creek
6
�
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'�G
86
M�ddle Green Rfver
Mile N
o �� t
� Soos Creek
�
Green River Basin
7t � .� P. T t+ `' - 'fT . - �� " �� '�" '+ ti� `
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Soos Creek 2
�BSERVED SPECIES: (refer to list in Appendix 1)
Tress: AR, PT, TS, TP
HerDs: LA, MU, OS, PH, RR, SD, TL
�Nb� AC, CS, �S, LL, RP, RS, SX, SD �
Sedges/Rushes/Grass/Ferrr SE, BX, AX, AF, CX, EX, J£, JX, LM, ,PA
B��s� G8, MA, VS, TS, BS, RB, AR, ST, MW, S5, YT, YW, WH', RS
Mammslx
Fish:
Other. DF
iARE/ENDANGERED/THREATENED SPECIES: {refer to list in Appendix 2)
Recwded/Obserred:
Poter►tial:
�IGNIFICANT HABITAT FEATURES: ,
)UTLET: TYPe� Pipe, Overland, Undefined I�
Condition: pPen '
Outflow enten: Stream
�TENTIAL STORAGE: Existing Active: 786 ac. ft.
Potential Active: 258 ac. ft. '
iENERAL OBSERVATIONS: Li tter from park on south edge. Fi1I pushed into wetland
from west edge. Ponds artificial. Bog area is drying up.
l�,�.-�ND EVALUATION SUMMARY:
�te was collected in the five categories shown belovr. Within each category the data was evaluatad to prodice numerical values. Composite
'ues for each category were produced in order to compars each wetland to other wetlar►ds in iu wb-b�asin a�xl in King County. The rewit of
at comparison was a percentile rank. The perctntile is expres�d on a scsle of o�e hundred and indicates the percent of wetlands that scored
ual to or below that perticuler site. For exampk,a percentile rank of 80 under wb-basin means that the wettand scored equai to or better
�n BO percent of �! sites within the wb-basin fw that evaluation category.NOTE: The percmtile ranks are vatid only within the individual
�luation category and are intended solely tor reference and comperison.
Rank
Evaluation Category 1by percmtile}
S1ib-basin County-wide
lydrology: runoff storage potential,water quality,potential for minimizing damage 94 98
in dwmstream areas
iology: quatity of habitac,abundance and diversity of plant end animal species 94 81
iwal: diversity and co�trast of wetland and wnou�ing vegetstion, 96 22
wrrounding landforms
ultu►al: types of access,proximity to schools/i�utitutions,overall 23 3S
ernrironmental quality
OonorrliC: pcesence of agriculture/peat extraction,anadromous or geme tish, 33 12
game birds or mammals of commerciaf value
�ETLAND RATtNG:
ach wetland vwas auigned one of three possible wetland racings. The wetland ratings were determined by examining the scores of selected
v tasks, specific data or percentile ranks for individual evaluation categories. The criteria used to auign the wetland ratings are
., n the Introduction. For each rating a number of specific guidelines fot new development in or adjacent to wetlands were prepared.
i.. ,�...�lines are intended to assist in carrying aut King County's Sensitive Areas Ordinance end other wetland policies. They are induded'e�
separate report titled"Guidelines for King County Wetlands".
Wetland Rating: 1 �c1
EXHIBIT I
BASIN RECONNAISSANCE SUMMARY REPORT
RECOTtNAISSANCE REPORT NO. 2
SOOS CREEK BASIN
JANUARY 1986
Natural Resources and Parlcs Division
and Surface Water hlanaoement Division
Kin� Countv. Washington
Kiag County F�ecvtive I
Tim Hill I
King County Cauncit _.. � I
` ,.
Audrey Gruger, District 2
Cynthia Sullivan, District 2
Bill Reams, District 3
Lois North. District 4
Ron Sims. District 5 �
Bruce Laing, District 6 �
Paui Barden, District 7
Bob Grieve, District 8 �
Garv Grant, District 9
Department of PubGc Works Pdrks, Plannin� and Resources ,
Don LaBelle, Director Joe Naael, Director
Suriace Water Management Division Natural Resaurces and Parics Division I
Joseph J. Simmler, Division Manaaer Russ Cahill, Division Mana�er ,
Jim Kramer. Assistant Division Manaaer Bill Jolly. Actina Division Mana�er
Dave Clark. hlana�er. River S Water Derek Poon, Chief. Resources Piannin� Section
Resource Section Bill Eckel, Manager, Basin Ptannin, Pro�ram I
Larrv Gibbons, Mana,er, Project i
hlanaaement and Design Section I
Contributing Sta[f Coninbuting Staff � �-� I
Dou� Chin, Sr. Ensineer Ray Heller. Project Mana�er �� Team Leader
Ran�il Parsons, Sr. En;ineer Macthew CIark, Project Mana;er
�ndv Levesque, Sr. En:ineer Robert R. Fuerstenber�. Biolo�ist �� Team Le�der
Bruce Barker, En�neer Matthew J. Bn►en�o. Geoiogist
Arny Stonkus, Enp neer Lee Benda, Geoloo st
Rav Stei;er, En�neer Derek Booth, Geolo�st
Pete Rin,en. Encineer Dvanne Sheldon, Wetlands Biolo;ist
Cindv Baker. Earth Scientist
Di Johnson, Planning Support Technician
Robert Radek, Plannin� Support Technician
Randat Bays, Plannin, Support Terhnician
Fred Bentler. Plannin; Support Technirian
Coasulting StaCf Mark Hudson, Pl�nnin� Support Technici<�n
Sharon Clausen. Plannin, Support Terhnirian
Don Spencer. :�ssociate Geolo�ist, Eanh David Truax, Plannin, Support Terhnician
Consultants. Inc. Brian Vanderbur„ Plannin, Support Technician
John Bethel. Soil Scientisc. Eanh Camlvn M_ Bverlv. Terhnical Writer
Consultants. Inc. Susanna Horni;. Technical �Vriter
Vir;inia Newman, Graphic Artist
hlarcia blcNulty, Tvpesetter
Mildred Miller, Tvpesetter
Jaki Reed, Tvpesetter
Lela Lira. Office Technician
A1am Cox. Office Technician
P:CR
i
TABLE OF CONTENTS '
I. SUMMARY 1 li
II. INTRODUCTION 1
III_ FINDINGS IN SOOS CREEK BASIN 2 I
A. Overview �
B. Effects of Urbanization 3 II
C. Specific Problems 4 �'
1. Bank failures 4
2 Channel erosion 4 !
3_ Ftoodino and potential floodin� 4 �,
4. Stream habitat -�
I�'. RECO;�II�IEND.-�TIONS 5
A. Inform appropriate governmental agencies of 5
the reconnaissance findin�
B. Reevaluate specific surface water management 5
policies
C. Prepare a comprehensive basin plan 6
D. Construct the capital improvement projects 6
E. Maintain or enhance instream and riparian habitats 6
V. M�P 7
APPENDICES:
APPENDIX A: Estimated Costs A-1
APPENDIX B: Capital Improvement Project Rankina B-1
APPENDIX C: Detailed Findin�s and Recommendations C-1
I. SUMMA_RY
The Soos Creek Basin is located north and east of the Greea River in King County. While
the southern and eastem portions of the basin are rural, the remainder is a rapidly
expanding suburban community. This devetopment pattern has not caused serious
environmental damage or flooding, however, due to highly pervious soils, an extensive
network of streams and wetlands that pravide natural storage for stormwater runoff, and the
fact that development has only recent}y accelerated in this basin. '�
Although the overall severity of problems in the Soos Creek Basin was not �eat at the time
of reconnaissance, several signiGcant probiems were identified and should be addressed.
These include banlc faiiures, channei erosioq flooding in some locations, and poor stream
habita�
Recommendations to address these problems include efforts to 1) inform appr�priate
age�ies of the reconnaissance findings, 2) reevaivate speci6c policy issues regarding the
management of surface water, 3) prepare a oompreheasive basin ptan, 4) mosiruct the
rapital improvement projecis evaluated with citizen advisory committee criteria, and S)
maintain or enhance habitat throughout the basin.
II. INTRODUCTION: History and Goals of the Program
In 1935 the King Covnty Councii approved funding for the Planning Division (naw called
the Natural Resources and Parks Division), in coordination with the Surface Water
Management Division, to conduct a reconnaissance of 29 major drainage basins located in
Kino County. The effort began with an initial investigation of three basins —Evans, Soos,
and Hylebos Creeks — in order to determine existinD and potentiat surface water problems
and to recommend action to mitio te and prevent these problems. These initial
investioations used available data and new field observations to examine geolopy, hydrolow,
and habitat conditions in each basin.
Fndinp from these three basins led the King County Councit to adopt Resoiution 6018 in
April 1936, calling for reconnaissance to be completed on the remaining 26 basins. The
Basin Reconnaissance Pro�am, which was subsequently established, is now an important
element of surface water management. The goals oE the program are to provide useful data
with re;ard to 1) critical problems needing immediate solutions, 2) basin characteristics for
use in the preparation of detailed basin mana�ement plans, and 3) capital costs associated
w-ith the early resolution of drainage problems.
The reconnaissance reports are intended to provide an evaluation of present draina�e
conditions in the County in order to iransmit information to policymakers to aid them in
developin� more detailed rea latory measures and specific capital improvement pians. Thev
are not intended to ascribe in anv conclusive manner the causes of draina�e or erosion
problems; instead, they are to be used as initial survevs from which choices for subsequent
detailed en�neerin; and other professionai environmental analyses mav be made. Due to
the limited amount of time available for the field work in each basin, the reports must be
viewed as descriptive emrironmental narratives rather than as finat en�neering conclusions.
Recommendations contained in each report pmvide a description of potential miti�ative
measures for each particular basin; these measures might prrnide maaimum environmental
protection throu:h capital project construction or development approval conditions. The
appropriate exte�t of such measures will be decided on a case-bv-case basis by County
officials responsible for reviewin� applications for permit approvals and for choosin, amon;
competin� projects for public construction. Nothin� in the reports is intended to substitute
P:SCB 1
Soos Creek Basin
(continued)
` �
for a more thorough environmental and en�neering analysis possible on a site-specific basis
for any proposal.
III_ FINDINGS IN SOOS CREEK BASIN
Reconnaissance in the Soos Creek Basin w-as conducted in November 1935 by Ray Heller,
resource planner, Randall Parsons, en�neer, and Don Spencer and John Bethet, consultino
soil scientists. Their findin;s and recommenda[ions are presented as follows.
A Oven+iew of Soos Cretk Basin
Geographic and land use features. The Soos Creek Basin is located north and east of
the Green River in the eastern portion of the Soos Creek Plateau Community Planning
Area. T'he basin is situated east of the city of Kent, northeast of Auburn, and
southeast of Renton. The city of Seattle's Lake Youngs w-atershed is inctuded in the
Soos Creek Basin.
The south and east portions of the basin are rurat in character, with the north and
west portions committed to a suburban development pattern that includes subdivisions
and scattered single-family homes. T'he 1935 Kin� Countv Comprehensive Plan shows
areas east of Big Soos Creek (in the northern part of the basin) and south of Lake
Youn� with "rural deveiopment" desi�ations that specify 1-5 dwelling units (DU} per
acre. The southern area to the east of Soos Creek and north of the Green River is
desi�ated "transitionaL" This interim desi�ation will limit development to rural-
residential densities until such time as rural/urban desi�ations are made throu�h
updated community plans.
The King County Parks Department aw-ns more than a �ve-mile stretch from Southeast
192nd Street to Lake Meridian, along Big Soos Creek. These presencly unde.�eloped
park lands are mostly wetlands and lie w-ithin the 100-year floodplain.
Major geoiogiS hydrauliS and hydrologic features. The Soos Creek draina,e area is a
tributary basin to the Green River basin. The area is part of the Puget Sound
losclands and is characterized by a alacial drift plain, cavered by small ridpes and
rounded hilIs that were formed by continental' glaciation.
While the Soos Creek Basin is moderately developed, the degree and amount of
channel erosion. slope failures, and other forms of geoloa e and hydraulic dama;e are
far less than might be expected. Artificiai convevances are also still functionin� in this
basin as thev were orip nallv desi�ed and intended.
These conditio�s mav be esptained by three main factors. First, there is a verv
effective natural retention and detention (R/D) s�5tem provided by an eatensive
network of 52 w�etlands and numerous major and minor streams. Most of the wetlands
are located in the nonhern portion of the basin in the upland areas as well as
adjacent to streams. Bi; Soos Creek ori�nates in the northeast corner of the piateau
and flows southeast to the junction of Little Soos and Jenkins Creeks, then curves w-est
at its confluence with Covington Creefc. Bi� Soos Creek joins the Green River east of
,auburn near State Road (SR) 13 at 160th Avenue SE. These wetlands and streams � `�
appear to be functioning well as stormwater control facilicies for the current levels of �
de��elopment, as well as servin� to prevent dama�e from surface water runoff.
P_SCB 2
Soos Creek Basin
(continued)
Second, the soiis in the upland areas generally have a high infiltrative capacity,
particularly in the southern portion of the basin. Stormwater is absorbed into the
ground at these locations before it can cause erosion or other damaoe. ,
Third, development in the basin has only just bea n. Properly functioning wetlands
and streams have not yet been altered, nor have well-draining soils been cwered by
impervious surfaces to any dreat extent. Maintaining these properly functivnin�
drainage systems shouid be a ;oal in this basin and will be the focus of
recommendations made later in the report.
Habitat chaiaderistics. The habitaE of Soos Creek Basin is generally Dood and
supports large populations of both native and hatchery anadromous fish. The source
of the hatchery fish is a State facility near the mouth of Soos Creek. Cutthroat trout
reside in stream w-aters, and anadromous fish spaw-n and travel in many of the
tributaries and the main stem of Big Soos, according to field observations and reports
Erom local residents at the time of reconnaissance. Habitat is being damaged or
threatened in some places by bank erosion and degraded water quality as.sociated with
land clearing, livestock feces, and wetland fllino for development. One of the more
serious instances of habitat-threatening erosion ori�nates at the parking lot of the
Seattie International Racew-ay (SIR), which is located on the plateau in the lower
portion of the basin. Drainaoe from the paved parking lot is increasino erosion in
nearby tributaries and fillino spaw-ning �aveis with sediment. Appendix C of this
report identifies sites of habitat damage or potential damage. Further w-ater quality
information related to habitat in the basin can be found in the Critical Stream
Inventorv of Soos Creek, published by Metro.
� Fffecis of UrfianiTation
Lov�; levels of development in rnost parts of the Soos Creek Basin, together with a
well-functioning natural drainage system, have kept serious erosion, sedimentation, and
habitat damage to a minimum until now. However, the present and projected rates of
development indicate that there could be increasina amounts of damage. as sug�ested
by the types of problems observed durinp reconnaissance. The expansion of
impervious sudaces in the basin is already be�nning to accelerate the rates and
volvmes of stormwater flaw-ing into (and reducing the capacities o� both natura[ c3nci
artificial channels. Impervious surfaces are also reducin� the amount of highIy pervious
soils available to absorb runoff. The predictabie unpacts are alreadv in evidence:
erosion, mass-w-asting, sedimentation, and de�aded water quality and other habitat
destruction.
The following section provides a more detailed account of problems found durin� field
investigation.
G Specific Probtems Identified
The studv team examined numemus sites along the main stem of Big Soos, Littte
Soos, and �'Vest Soos Creeks. as well as 21 small drainages tributarv to these main
stems. Several of the most si;nificant problems found durino reconnaissance are
described below.
P:SCB 3
Soos Creek Basin
(continued)
��
1. Bank faitures. On Tributary 0072A, river mile 3Q, for example, there e�sts a
major bank failure tri�,ered by bank undercuttin;. The source of the problem
appears to be increased runoff from street construction. Unless flows are
intercepted and redirected to storm sewers or other facilities, there w-ill be
increased bank erosion and consequentiat deterioration of property and stream
habitat.
2 (�annel Ein�ion. This inctudes both instream and bank erosion caused by lar�e
volumes of runoff emer�ng from storm drains and washing away highly eraiible
soils. This creates a new, deeply incised channet that enla bes over time. One
example of this problem occurs on Tributarv 0072 near the SIR in the lower
part of the basin. La,e expanses of pavement at this location have contributed
to high volume flows and channel erosion.
3. Flooding and potentiai f]oodin� In numerous locations, development has
' increased the amount of runoff entering existina drainage facilities or otherwise
impeded the ability of natural systems to carry the amount of runoff. When
drainage systems fail to funciion as they were intended, flooding can occur.
Increased devetopment w-ithout concurrent increases in drainage facilities adds to
the possibility that serious floodinp will occur. On Tributary 009?, river mile 1.20,
for ezample (collection point lI), the Little Soos has been contained and
manicured as it passes through a developed plat. Such alteration to a natural
drainaoe channei reduces the stream's capacity in places. The result has been the
reo iar semi-annual flooding of some homes. Further devetopment could
a�avate these kinds of flooding problems.
4_ Poor siream habitat due to.
a. Iacic of overhead canopy and streamside vegetation_ O�erhead canopv I
stabilizes w-ater temperature, while streamside vegetation protects banks from
erosion.
b. Contamination by livestock feces. In areas of the basin where livestock have
extensive access to streams, water quality has become de�aded by animal
feces. These cause harmful nutrients to be added to the w-ater which can
threaten fish survival
c Erasion_ Streambank and channel erosion, already dexribed above, is caused
in part by livestock access. On Tributary 0073, river miles 3.60--3_70. for
example. there e�ists poor stream habitat because livestock have trampled
and denuded banks of ve�etation; this has led to the sedimentation of
spaw-nin� areas and caused turbiditv.
IV. RECOMMENDATIONS FOR ACITON
The followin; recommendations are based on findin�s of the field team and reflect the
ori�nal �oa1s of the Basin Reconnaissance Pro;ram, as outlined in the introduction of this
report_
A. Inform appropriate gwernmental ag+encies of the detailed findin,s from the
�
reconnaissance of this basin. Project representatives should meet w�ith staff from Kin�
P:SCB �
Soos Creek Basin
(continued)
County Roads Division, Surface Water Management Division, Building and Land
Development, and other interested agencies to transmit relevant information.
B_ Reevaluate specific policy izwes regarding surface water managemenL These may
include the need to:
1. Improve eaforoement of wetlands regulaEioaz to maintain these areas in their
aatural states This will insure their continued function as surface water quality
and quantiry controllers, as weU as preserve their habitat value. If reb Iation
proves ineffective, the Counry should serure easements or consider other means
to preserve wetland areas.
2 Require t6e establishmeat of nndistu� buffers and seibacks adjacent to natural
drainage swales. Variations in stream morphology and geology indicate the need
for stream corridor o idelines that take these into consideration. Improve
enforcement of "no ciearing" covenants in these sensitive areas or seek Countv
easements or actual ow-nership. Fencsn� atong streams in livestock areas w-ould
help water quality and reduce erosion and sedimentation.
3. Invesiigate and promote the mfiltration of surfaoe water where feasible and
economical to reduce increased runoff from developed areas. Also. encouraae the
vse of �ass suales and open ditch conveyaace systems to improve infiltration and
water quality enhancement capaciry. Areas of hioh filtration are identified on
final display maps (for the Basin Reconnaissance Program) in the offices of
Surface Water Management, Buiidino and Land Development, and Basin PlanninD.
4. Require the tightliniag of storm�rainage outfalls dvwn steep or sensitive
slopes using state-of-the-art facilities, �including high density polyethylene pipe with
energy dissipation at the outfall.
5_ Reevaluate stormwater rate and wiume releas�e regulatioas for new developments.
Current reD lations may be inadequate and result in unacceptable downstream
erosion that causes property damage and loss of habitat.
6. Increase current maintenance levels for King County surface water R/D and
mmeyanoe facilities. Due to the tack of funding, maintenance of existin�
facilities is sometimes insufficient and results in facility dvsfunction and failure.
These wili onlv be agoravated bv additional upstream development.
P:SCB �
Soos Creek Basin
{continued) _�
C. Prepare a comprehen.sive basin pian to coasider, at a minimum, the need to:
1. Fahance and utilize the eztensive e�osiing wetlands as re�ooal storm-detention
facilities without jeopardizing habitat values. Prepare a schedule for the
anticipated need for these hydrolo�c enhancements as they relate to projected
development in the basin and impact the wetland ecology.
2 Eaamine e�ting storm�eteation and comeyance fac7ities to determine whether
their control orifices are pmperly sized to optimize the detention site and achieve
the maximum benefit to the downstream systems.
3. EStablish floodplains in low-lying areas of stight gadient for existing and
developed runoff conditions, i.e., adjacent to wetlands, particulariy for wetlands
proposed as re�onat detention sites where inundation of adjacent properties may
be si�►ificant.
4_ Identify stream reaches critical to the maintenaace of anadromous and trout
P�Puiatioos.
S. Review geoiogic Findings from this study in order to identify areas of particular ',
soils' sensitivity and develop special analysis criteria for nev�; developments. I
D. Construct the capital imprwement projects acoording to t6e CIP priority selecrion
criteria. T6ese projects, identified in Appendu B of this ieport, include projects to: '
1 Cal�brate and retrofit ea-isting detention-control structures and to improve existing
conveyance systems.
2 Stabilize c�anneLs and slopes.
3_ Provide regional detention faciliries, includin� the utilization of wetlands. where
biolo�cal assessment has determined that the natural habitat values will not be
si�ificantly altered.
E_ Maintain or enhance the insiream and riparian habitats
1. Maintain weitands and buffer areas around them. These provide both valuable
wildlife habitat and natural stormwater storage that helps to maintain year-round
baseflov�s in the stream.
2 Adopt a st�eam-corridor poliry in the Soos Creek Communitv Plan to protect the
stream corridor from dama;in; types of land uses in adjacent areas.
3_ Encourage the WaShington State Department of Fisheries to allow use of the
natural stream system for salmon spawnin� Maintain a natural run of all the
indi�enous anadromous species.
4_ Prolnbit Cilling in the 100-year floodplain. The Countv should establish
re;ulations to prevent the loss of floodplains in order to maintain their natural `�
' stora_e for floodwaters and �uard a�ainst de�radation of important fish and
wildlife habitat_
i
I
P:SCB 6
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L'.S'I'IM/1'I'�U COS'I'S: 1'R<)POS�U Cnl't'I'/1t, IMPItOVGM�N'I' I'It(�.I�C't'S
SOOS CR[:L'K 13AS(N
'� Indicales pro�Qcl was idenlified by the
Surtace Waler Managemenl Division prior
lo reconnaissance.
NOfE: All projects are located on map included
in ihis reporl.
I'rc�jccl (:ollccL Cstimaled Cosls
Numhcr Pc�inl Projccl Ucscription ProUlcm A�Idresscd and Commcnts
S�1Ol* 2O Construct low bcrm (approx. 2') �►nd Milig�tcs incre�sed upstream peak $153,000
pi-orortiontil �lischarge-con�rol weir flows ana runoff volumes. (likely to be much
al outict �o wcllan�. ('I'his �rojcct Icss due to land
is in�JupcnJcnlly justifinblc.) W�Ilan�l acquisition cost)
r�ilin� is #2. L3ic>I�gical �isscssment is
ncccicJ lo a�.surc Ihis projcct docs not
�ccrcasc hahilat valucs. ,
Sa02� 9 Cxcavu�c an�1 hcrm �o constr��ct rcgion�l Mitig�tcs incrc�scd upstrcam pc�k $194,000
facility i�t lowcr cna of wcUan�l. flows nnd n�no[f. This loc�tion scrves (depcndent on land
1'rovid� proporlion�l wcir diu:h�rg�. 'I'rib. 007;i nnd OQ7G. (Good location.) costs)
WcU��nd r���ing is #1. l3iologicnl
a�.�c�.smcnt is nccdcd to ��.surc this
�rojcct docs not Jccrc�sc h�bitnt v,ilucs.
5-103" Cc�uIJ not loc,itc or vcrify. AJclress in b�isin plan. (Climinate for now,)
540�' 17 Cons�rucl a proportionul conlrol wcir Mi�i��tcs increascd upstrc�m pcnk flows $250,OQ0
Wc�lanas 4�11(� �it S� 224t1i St. hriJ�e. (I'roject shoul�i �nJ runoff. (�irst site tlint could
he justific� hy ,i fulure h<isin �iaclress flows south of Petrovitsky.)
rl�in.) Wcll�►n�1 r�iting is #2. BioloFic��l
a�.1c�.smcnl is nccdcJ lo ��.tiurc this
Projcct �locs nol �Jccrcasc h�ihilat v,�lucs.
r;sc�i3.nrn n.i
Prc�jvc� ('c�llcct. Cstimatt_ .:osts
Numhcr Point 1'rojuct Ucscription Prohlcm Addre�.scd ��nd Commcnts
5q05° 19 Construct hcrm �n�l propor�ion�il control Mitigates incre�sed u�stream pcak $98,000
wcir in [3oulcvar� I,anc P.�rk, (Projcct flows ��nd ninoff.
shouW hc justificd hy a b��sin
plun,) Wctlancls ra�ing is #1
L3iolo�;ical a�.tic�.smcnt is ncc�c�J lo
�i�.tiurc thiti projcct �locs not �ccrcasc
hahital vulucs,
SaO(�" 12 Conslruct �ullct-control structurc Mitigalcs incrc�scd upstrc�m pcak $17,800
WuU�in� 5�4� a� cxisling culvcrt p�i�.sing flow flows �nJ n�noff. May provide
un�cr SL: ?S(>Ih St. (Pr�ject woul�l extra detention lo �s,5ist in
hc inJupcnJcnUy juslifiahlc.) Wcllt�nd allcvi�ting cnp�icity problems far
ru�ing is #?. l3iologicnl �c5c�.smcnt is downstrc�m.
nccdc� lo ti�.tiurc Ihis projcct Jocs not
Jccrc�isu huhilsil vuluc5.
5�7(17 15 Contitnict a hcrm tin�i proporlion�l Mitigatcs incre�scd upstrcam pcak $22$,000
Wcllana Sa2O �lischargc wcir .it �ullct of �xitiling flows nnJ ilinoff.
wutl�inJ. (Projcct shoulJ hc jusii-
ficJ hy u hasin plan.) Wc�lun�
r;iting is #2. L3iologicul ���.tic�.�mcnt
is nccdcd la ��.tiu►•c this prc>jccl �ocs
not Jccrc�isc hahit��t v,�lucs.
5-1O�w 13 R;iisc thc SL ?40th SI. ro�iJway Mitig�tcs incrc�sed upstre�m pcak �70,000 I
��rr������„�►�v�y ?' t�nJ construcl u ncw flows and runoff. (Good localion.)
hri��;c with proportionul contr�l wuir.
(I'rojccl tihoul� hc juslificJ by a hasin
�I�in,) WctlanJ r�iting is #2.
l3ic�locic�il ���.tic�.timcnt iti ncc�c�l to
a�.tiurc Ihis prc�jcct Jc�cs nc>I cJccrcasc
h,ihilal valucs,
I':ti('l3.nl'n n.2
�; .. �
I'rc�jccl ('ollcct. Cstimatea Costs
Numhcr I'oint Pi•ojcct Ucu:riptic>n I'rohicm Ad�Jrc�.sed and Comments
SaO�)~ 13 ("onstruct bcrm an�i proportion�l control Mitigntcs incrcnsed upstrc�m pcak $221,000
Wc�lancl 5�33 wcir �it outlut lo Clark I��ke. (I'roject flows �nd runoff volumes. M�iy (dcpendi�g on land
could hc incJcpcndcntly justificd.) providc cxtra �elcntion to allcvintc costs)
Wc11anJ rating is #l. 13iolobic�il capaci�y prohlcm downstrc�m.
��.ti��.smcnt is neccicJ lo �is.�;urc Ihis pro-
jccl �ocs not Jccrc�isu h��bitat valucs.
541O" 8 Constilirt ccnlr�l manholc �t oullct I'rovidcs contimicd detention for $28,000
Wctlan�l S4�'S8 of cxitiling pond. Uc�d storngc should mohilc homc p�rk plus small �motmt
hc maiinlaincJ for �csthclics. (I'rojcct of .uJJitional arca.
sccros of vciy limilcd v�iluc.) WcUnnd
rating is #?.
541I" I8 Sm�ill wctlan� locatc�i ncar top of No projcct proposcd. Maintain (Lliminatc for now.)
WuUancl 547h suhh;�sin; m�iinlain condilion ns is. wctland in ils cxisting st��tc.
Wctlan� rating is #2. L3iologic:�il
a�.tic�.timcnt is nccdc�l to assurc this
pro.jct clocs not dccrc�►sc h�ibitAt v;�lues,
5�11?" 16 <'onstruct bcrm �na proportion�l control Mitig�tcs incrcascd upstream pcnk flows $246,500
Wcllan� 54�0 wcir at ouUct l4 wcU�na. (1'roject and runofL (dependenl on land i
shoul� he justificd hy futurc b�isin costs)
pl<in.) Wctland r�ling is #2. L3iologic�l
��ssc�.timcnt is nccdcd to �ssurc this
��rojcct Jocs not Jccrc�sc hahil�l v�lucs.
5a I:�" :� Conslruct herm and proportional control Mitigates incre�►sed upstream pe��k $193,600
Wutlan�i SA77 wcir �il oullct to wetland ,idjacenl 1� flows �n�l runoff. (M��y not be �s (dependent on land
SR I�. (Projcct shoula hc juslific�i hy dcsirahlc �s Projccls 5419 nnd 542Q.) costs)
futurc ha�in pl��n.) Wcllan�l r�iling
is #2. l3iolo�ical ��.tic�.5mcnt is ncccicd
�o a�.tiurc lhis Proj�ct Jocs not �iccrc.isc
h�ihi�at v�ilucs.
i�:�c��3.ni�n n-�
1'I'ojc�l Coilccl. L'sllnlll� SIS
Numhcr I'oint Prc�jcct Ucsc:ri�tion Prohlcm nddres.scd and Coi, ,nls
S-t I-t 2 Cons�n�ct hurm anJ cxc�vule io Mitig�►le incrense�l upslrenm pcak flows $JG9,000
rrovide �d�ition�l detention volume. �nd ninoff. Reconstruct disch�rge from
('onstruct � control m�inhole. (Project SL 320th St. to sliil>lc outict. (Justifi.►l�le
is inJupenacnlly juslifit�hle.) immediutely due la impacts on state fish
n����i,��y.�
5�{IS 1 ConsU•uct ti�h�linc sys�cm in Prcvcnts [urthcr rond embankment and stcep $15G,000
existing stre,im channeL (Prajcct cut-h�nk failures. (Justified immedi�tely
is incicpun�icnlly juslifulil�.) due lo impt�cts on st�te fish h��tchcry.)
541�, Il l'c�ns�ruct ncw I��n��:�ped herms adj�cent Prevent neighhorhood floocJing, which
�o cxis�inb privutcly ownc� un�l m�iin- jcop�ir�izcs 3-4 homes by cont�ining strcam
I�iinc�l strcam chunncl to incruasc �s it ptisscs• lhrough plat. (Justifi�Ulc
capacity .inJ pruvcnt ncighhorhood immediately as situalion will only worsen
flo�Jinb. (Projuct is indcpcn�iunlly with upstream �ievclopment.)
juslifahlc.)
5a 17 13 , Raisc 14R�h �1va S� roa�lway fipprox. Llimin��e scasonal flooding of ro�dway $223,000
I,.S' an�1 construct proportional conlrol nnd mitig��te incro�scd upstrcpm pcak
wuir �it SL; 25�>Ih hri�gc. (Prc>jcct is flows �i�d runoff. (.lu5tifi�►ble immedi�tcly
in�lcpcn�icnlly justifahlc,) Juc to flooding of roadwAy.)
5.�1�� I`t ('onstruct ccmtrol wcir ��I hri�bc on Mitigalc incrc��sc� ups�rc�m pcak flows $88,700
SL I.:ikc Youn�s Way. (I'rojccl should nnd n�noff.
hc jutilific�i hy fulurc h��sin pl�in.
S-J I') 10 (:onstruct proportional wcir ut �ais�ing Miti�atc incrcasc�l upstrc�m pcak flows $138,Q00
hri�Jgu. (Pcoject shouW bu j��s�ificJ Find runoff volumcs. (Sitc appct�rs more (depenelenl on land
hy fu�urc h�isin rl�in.) dcsir�ihl� �hun S�Il3 duc to casc of usc costs)
accu�.ti.)
S J?O I I Uivcrt cxcusti flows from I.illlc Soos Miligalc incrc�isc�! u�strcnm pcak flows $8$,SOQ
into ��I,anJonc� hc�rri�w pit for infil�r��- uncl runoff vcilumus. ('I'his is a hi�;hly
�ic�n. (1'rojccl shoulJ hc juslil'ic� hy Jusir�ihlu ,illcrn�ilivc Juc to groun�lwniur
fuiurc h;isin �I�in.) rcch�irrc an� quulily control.)
I':�Cl3,n I'n /�-4
��; ;,�
APPENDIX B
CAPITAL IMPROVEMENT PROJECT RANKING
SOOS CREEK BASIN
Prior to the Soos Creek watershed field reconnaissance, 13 projects had been identified and
rated using the CIP selection criteria developed by the Surface Water Management (SWh1)
Division and the Natural Resources and Parks Division. Following the reconnaissance, 20
projects remain proposed for this area. They include the 7 new, previously unidentified and
unrated projects plus the initial 13 project�
The previous SWM capital improvements project tist for t6e Soos Creek Basin had an
estimated cost of S3.450 000 while the revised list decrea.ses to an estimated cost of
. > >
S?,62,000. This 24S''o reduction in estimated capital costs is due mainly to downward revised
cost fi,wres for acquiring or securing easements aver w-etlands.
The follow-ing table summarizes the scores and co�sts for the CIPs proposed for the Hylebos
Creek Basin. The projects were rated according to previously established SWM Program
Citizen Advisory Committee criteria. 'The projects ranked below are those for which the first
rating question, ELEMENT 1: "GO/NO-GO." could be answered affirmatively. The projects
can now be coosidered for mer�ng into the "live" CIP list. Any project xoring over 100
points shouid be considered for incorporation into the si�c-year CIP plans.
RANK PROJECT NO. SCORE COST
1 5415 135 S 156,000
2 5�317 127 ?2i,000
3 S�OT 113 �23,000
�i 5414 105 169,000
5 5�109' 100 221,000
6 5416 93 63,400
7 S�0?' 95 194.000
8 5�301' S9 153.000
9 5�06' 33 17.300
TOTAL S1.�30.000
' Indiraces project w�as identified bv S��%I�f prior ro the reconnaisance.
APPI:NUTX C
UL;'fnll.�U I�INUINGS ANU ItL.COMM�NUA'['IONS
SOOS CRC'sL;K l3nSIN
� All ilems I�sted here aro located on linal display maps in
Iho o(Iices ol Surface Water Management, building and land
Developmenl, and Eiasin Planninq.
'I'ril�, .� ('ollccl. Csxislin6 Anticip�l�J
licm Itivcr Mile I'oin� C,ilc�c� I'rop. 1'roi. ('on�li�ions �nd ProhlemS Conditions �nd Prohlems Recommendations
I Oc)7? l l iy�lrology Sce Ilcm b. M�in slem will be strained to New developmcnts in upland arca I
ItM 2,�ca �ccommoJF�lc incrcF�scd volume should invesligatc infiltration of
of runoff from developing n�noff �s mucli as possible. Direct
�rcas upstrc�m. Li�nk erosion dischargc to strc�m, aftcr tighUining
(cnusing incre�sed siltation down sensitive slopes, is undcsirnble
nnd h�bil�it dcstruction) ond "last choicc" altcrnativc,
slopc failures (Icnding to
property cl�m�gc) will result.
2 (l(172 1,3,IO, I lahil��t Ilahilat of �ipper strcam Morc filling of wctl�nds. Prohihit filling within 100-yr.
1tM ,�iU 13,17, gooJ from buffcr of cxtcn- Scdimcnt from adjaccnt devcl- [loodpl�iin or in wetlands. Work with
I�,I'), sivc wcll��nds nnd m��inlcn- opmcnt will fill portions of lan�lowners to fcnccg alongsidc strcam
20 �nce by County Parks Dept. wctlands .�nd stream chnnncl to keep farm animals out.
Prohlcros on .SC�2 acres qf duc to luw graaicnts. Morc
wc�l<�nas includc illcfi�l dcbris, pollution, and flood-
fillin�, livcstock-rclatcd ing will result from �ddition�
bank crosion, �icbris in dcvclopmcnt.
sU•cam. 't'here is � Frc�tcr
�1c�;rcc of Jcvclopntcnt
�i�ljaccnt lo slrc�im. M�iin '
slcnt proviJcs important
rcaring hsihitat for
salmoni� s�ccics.
I':ti('l3.nl'(' (:-1
1.,*y,,. .. ����
'I'rih. ,� ('c�llcct. L'xisling nnlici���tecJ
Ilum Kivur Mil� I'oint (',ilc c�i I'rop. Proj. Con�lilions und Prohlcros Conclilions �nd Prohlems Recommcndalions
;� (1(172 I (icolo�,ry Soos Crcck mcan�icrs on � Untitablc soils an� wct con- I�uture construction should reccivc
1tM .�,0 wi�� iiUuvial pl�iin. Ilum- Jitions on v<illcy slopcs, close slu�ly for stability ��nd
mocks on v�illuy walls �n�l erosion polenlial.
„pislol hull" Ircc trunks
suFgcst colluvial crccp.
Nuntcrous springs wilh silt/
cl�iy lithology.
4 O072 1 l t�ihit��l D�m on main stcm intpounds Increnscd flows will result Dcvelop Uasin plan wilh computcr
1tM .�,0 fish for sl�tc fish in more flooding and potcntial simulation of strc:Am flows to give
hatche�y. No problcros l�ank erosion. complcte analysis in lower portion
ohscrvc�. of Soos Creck. Also include lenkins
�nd Covington Gecks.
5 (1(17? l (icoto�ry Crosional chutc fi' dcep liighlights scvere erosional Reccssion�l s��nd deposits
1tM 1.7() cmcrgcs from ninoff of potcntial of this rcccssional in sections 2, 3, l0, 11, 14, 15, 16,
Scf�ttic Intcrnationul Ro�d- s�nJ unit �nd imp�ct of un- 21, and 22 of 1'21 N, R 5 C arc
way (Sllt) parking area, controlled runoff. highly sensitive to erosion. Require
I.ithogr:�pli is loose, strati- hydroloic and geotechnical reveiw
ficd reccssion�l s��nds. for design, adec�uacy, And suitability
I.��rgc slidc induccd north of collcction and convcyance facili•
of r��ilr��od right-of-way. ties for all runoff fram SIR, as �
well as cxisting and pl�nned develop-
ment within houndary of collection
�rea. Re;yuire implementation and
compli�nce if no facilities exist.
�, OO72 1 Gcolo�ry Main stcm of Soos Crcck is Nonc. Nonc.
KM 2,50 25' widc with wcll-dcvclopcd
gr�vcl l�<�rs. '1'crraccs
su�gcst oca�sion�l flows 2"
ahovc currcnt IcvcL
i�;sc��.nrc� c.�
'I'rih. �� Collucl. C;xisling Anlicipalcd
(lcm Rivcr Milc I'c�inl C;il��c�� Pron. Proj. ('onJilicros sinJ 1'rohlcros ConJilions <�nd 1'rohlcros Rccommcnd�►tions
�i O072 I (;cc�logy M�in stcm of Soos Crcck is Nonc. Nonc.
ItM 2.Sq 25' wiJu with wcll-dcvolopcd
gravcl hFirs. Tcrraccs
sug6cst occasioanl flows 2'
�hovc currcnl Icvcl.
7 O(172 I Gcolobry In vicini�y of priv�itc foot Continucd mcJium to Inrgc None.
1tM ?�iO hridgc, mcdium lo I�rge failures into crcck.
hank fuilures occur in silt/
cl�iy-rich colluvium.
Cnusative mechanisms include
undcrcutting and reauced
shc<u strcnglh owing to
�hun�ant srrings and seep�►ge
�S 11(172 l Il��hitat Privatc Inn�lowner h�s f�ill �nd ripr�p will shift Itestricl [illing and riprap in
ItM 2.�,(1 pl��ccd ri�r�ip for 1S0' on strc�m onta opposite b�nk, n�tur�l mennder of floociplain. If
Icft I�nnk. resulling in incre�sed bank property in danger, consider pro-
erosion. tective measures along streamb�nk
such as riprap.
�) O(172 I (;colory 3Q" di��mctcr CMP with Continucd maintenance. None.
ItM 2.fi5 crosion in rccc�.Sional
sands.
IO Oc)72 3 llyclrolobry 5�13 Scc Itcm (>. Main strcam will be increas- New dcvelopments in upland area
1tM 2.�t-1- in61y slr�inud to h�►n�11e should imestigt�te infillntion of
S.'t5 higher volumc of nino[f from runoff As much as possiblc. Dircct-
dcveloping �rens. I3Ank ing disch�rge to stream after
crosion nnticipated, causing tightlining down sensitive slopes
hahit�t acgr�idation, slopc is undcsir�blc "last choice" �Itcr-
failures, an�i properly dam�ge. native.
I':S('13.n1'(' C.:�
,�,"� ,�", c..
�
i
'I'rih. �� ('ollcc�. Lxisting l�nlici�atcd I
I�cm Itivur Milc I'c�in� Calc roi Pron. Prol, Con�Jilions anJ I'rohlcros Conai�ions �nd 1'rohlcros Rccommcnd<uions
I I tu)73 3 (;cology West of conflucnce of Crcek hlock�ge and threat to Recessional s��nd deposits in sections
I:M a.2(1 Jcnkins and Soos Crccks, proper�y near edge of bank. 2, 3, 10, 11, 14, IS, lh, 21, �nd 22
2O0' of sloughin�; in of T 21 N, R 5 C are highly sc:nsitivc
rcrc�.5ional s�in�is and to erosion. Idenlify dis�;hargc
fir�rvels in 40'-hi�h bank. sources anJ ev,ilu�te adequAcy an�
C�iusc a��cars lo hc ovcrbank suit�►bilily oF colleclion anJ convcy-
�iu:h��rg�. �nce facililics. Rcquire compliance
i[ nonc cxists.
I? (1l)72 :� Ilabil��l Strc,�m hahilat �ppears to None. None.
KM 4.2O bc in goo�i con�ilion on
Ihis slccper portion of thc
strc�m. Rifflcs common,
with somc pools. Slrc�m-
sidc vcgct�ition �nd ovcr•
hc��d c�nopy both abund�nt.
I� OO72 :i (;cology Nc�r bri�igc, slre�m flows incres�sed future flows could Developmcnt detention for
ItM 5,,�0 through woocJcd wctland. overtop existing berm stnic- tributaries upstream.
tures �n� flood �djncent
t�6ricultur�l lands.
la OO72 10 Ily�rol�bry 5419 Slight Jegrce of dcvelop- AreA pl�nncd to develop only A basin plan should examine
RM 5,85 mcnt hus not cr�uscd sig- maier�Ucly; signific�nt prob- [easibility of dirccting flows from
nifi�ant proUlcros. Soulh Icros will prob�ibly rusult Trib. OQ92 at colleclion point 11
portion of Wctl<inJ G430 from upstrcnm t�reas tribu• into propo.sed R/D site at gravel
��nd un�lcsi�n�IcJ wcll�nd t�ry to this point r�thcr pit e�st of 156th YI. SC. This
�t Ihis collcction point than from flows generated could provide infiltration, deten-
proviJc R/U foc loc�l �nJ l�y runoff. lion, �nd overflow discharge directly
upslrc.im trihutary flows. to collcction point l0.
Somc localii.ca h,�nk ovcr-
�opping in rortions of
m�iin rcach, hut innund,�tion
�r�hahly limitca to �i�jac-
cnt ���ricultural lan�i.
I':ti('13.�11'(' ('.q
'I'� _. ('c�llucl, L:xisting llnlicip�tc�1
I�um Itivcr Milu 1'c�int ('u�c��c�iy 1'roP. Proj. ConJitions ��nJ I'r�hlcros Con�itions an�i Prohlcros Rcc:ommunJ,�tions '
IS OO7? 13 C;colo�ry At 25fith crossing, wcllands (hcrflow hetwccn SL 148th �n� Pcrform cost-benefit an�lysis for
I2M 7.?O <�n�i slow flow ch�ir��ctcrize SL. ?S(�lh. gr���ic raisc and improvc� druin<igc.
soils.
IG OO72 I i (;colo�y 11l 2441h (24QIh) ovcrlanJ Nonc. Nonc.
I:M 7.')5 � out-�f-hank flow is �on�mon;
f Ic�o�i nb.
17 (>(172 13 llyclrolc>�,ry S417 Wctlnnds provi�ic R/U for I�loo�iing of roadw�ys will Incrcase hcight of roadway embank-
Msiin s�cm SqOg arc,�s upstrcam nnd tribu- bccomc morc common and ments to prcvcnt continued flooding.
RM 7.2O-7.4 tary to reach. lQ8th Ave, greatcr in �xlcnt ns upland Monitor weUands for illcgal filling
ItM 7.')5 SL roadw�y crossing wctl�nds �u•c��s dcvclop. and gr�ding.
in arc� is ovcrtoppcd durin�
high flows duc to a slight
elev�tion of roadw�y. Some
loc�lixcd bank ovcrtopping
in nonwctland portions of
m�iin rc�ch, hut innund�tion
limilc� lo Fidjaccnt �gri-
cultural I�ind.
I� O072 17 Gcolo�y Minor flooding in wetland Incre�sed floociing activity Develop detcntion for upstream Areas.
1tM '�,45 �re��s with degr��lation of is likely with upstream
portions of SC ?2�iih. devclopment.
19 0072 17 Ilydrology 54U4 No significnnt problems in No upland probl�ms �ntici- Monitor Arcas adjacent to wellAnd
ItM ').55 upland due to low levcl p�ted as �rca is planned ta for 111egal filling and take enfarce-
dcvclopmcnt. SL• 224th Sl, develop very IitUc more, ntent action �s needed for restor-
ro��d emUankment is only Any developments in nre�s s�tion.
t�Pprox. ?' �l�ove wctl�n�; trihutary to lhis subb�sin
may hc ovcrtoppc�J. 1'criodic will cx�ccrl�ailc flooding of
ovcrtopping anJ innund��tion SL: 3241h St.
of hasc, Jcicrior�iling ro�d-
w,iy whcrc "l'rih. Op95 p��.scs
un�icr SL: ?241h.
I':�('13.n1'(' (:-.S
�i'�S� ' �
'I'i•ih. <<'c Collccl. L'xisling AnlicipatcJ
f Icm Itivcr Milc Pc�inl C�ilc oi Pron. 1'roj. Con�ilions and Prohlcm5 Con�iilions �n�1 Prohlcros Recommcnd�tions
2O OO7? I� (;colofiy Soos hcndw�tcrs flow slowly Nonc. Nonc.
ItM IO.5O thmugh smoolh rasturcl�nd.
21 ()()73 I� Ilyarolo�y 5418 Wcll�ind S4Q9 providcs R/D ('ontinucd dcvclpment m�y Monitor arcas adj�cent to wetl�nd
ItM 1O.7� for are�s tribut��ry lo cause some loc�lized c�p�city for illegal filling �nd take enforce-
rc�ch. Somc loc��li•r.cd hank rrohlcros in upl�nd trihut�ry mcnt �ction �s needed for restor�- I
ovcrto�ping in main rcach �rc�s. l�looaing south of tion.
south of 204�h Way, but SL'• 204th W�y likcly to bccomc
floo�ing currenlly limited more sevcre until upstre�m
to .�dj�ccnt �griculturnl rcgionnl dctcntion sitcs
I�ind. �wclopmcn�.
22 ()(l72 !9 IlyJrolo�,ry 5405 Wetlan�l 5402 provi�fes WctlanJs will continue to be Le�al nctions pending against illc:gal
RM 12.20 nt�tural R/U to downstrc�m thre�tened l�y illeg�l filling filling; se;ek to restore wetland to
syslem, ��I�hou�h its func- u�lil cffective en[orcement original state. Possibl� opportunity
tions h�vc becn scvcrcly mclhoJs �re developcd. to creatc multi-use fncility in
dc�caeJcd by illegal filling CF�pacity problcros should be existing King County I3oulevard L,�ke
soull� of nnd ��fjacent to �c1Jre�.scd by downstre�m an�l- Park if nced identified in future
Pctrovitsky ]td, �nd casl ysis for ncw dcvclopmcnls. b�sin pl��n.
of SL' 1S2nd St. Some Counly should coordin�te
c�p�city problcros exist convcynncc improvcmcnts.
�t uncicrcrossing of I'ctro-
vilsky Rd.
I':S('l3.nl'C G(>
'I'rih. �� Collcc�. Lixislinb l�nlicipal�J
I�cm Itivcr Milc 1'oint C�ilc�c�y 1'rc��. I'roj. Con�lilions �na Prohlcros ConJi�ions �nd Prohlems RccommcnJ.itions
3z (1O7? 2O IlyJrolobry .5401 I�aclo�:s cxplaining lack of Rcccn� insl�illcd s��nitary Protcct and cnhancc wcUand. A
ItM 14.?5 prohlcnts in this �rea: scwc�:s make it likely that high-dcnsity muUi•f�mily �cvclopmcnl
I) this ��nr�r�»os� suharea �rca will �ippro�ch its m�y be proposed �dj�ccnt to wcU�incl
h�is no olher trihulaiy anlicipalcJ density soon. due to incrc�sing devclopmc;nt pres-
arc<is; 2) �evclopmcnt is Wc11anJ will continue to sures in arca, I
mo�icra�c ��nd m�ny homcs �rc providc a�Jcqu�tc buffcr for I
siluatcd on largc scvcral- �iownstrc�m systcm, providcd
�crc parccls; 3) �n cxtcn- it is not dcgradc�l by illegal
sivc wctl�in�l (#5401) �cts filling or cic�ring. Channcl
�s cffcctivc natur�l It/D upstrc�m of wcU�nd is likcly
sitc, �s cvi�i�nccJ nt �o expericncc somc cnpacity I
collcction point. prohlcros; thcse should hc �I
addresscd Uy ncw dcvclopmcnts
�s thcy occur, possibly wilh
County coordin�ting A cooper�-
tivc funding of convcy�nce
improvements,
24 OQ72n 1 l iabitat Thcrc �re scvcral severe More dcvelopment at collcc- - Repair erosion of R/D pond at
RM 2.�1O bank cuts, ns wcll �s debris tion point ? and �t Green upper end o[ tributary.
in stream. Il�ibi��l for Rivcr Community College will - Remove debris from slrcam.
fixh is poor. incrc�sc flows. Incre:►sed
flows will result in more
b�nk crosion, sc�fiment, nnd
lo�.y of h�ibitat.
25 OO73n 1 Gcolobry Ur�iin pipe unJcrcuts to Ifighlights potenlial for Cvalu�te source and establish
ItM .35 form crosion�l chute. conlinucd or incrcnsed nitcrn��te mc�ns of convey�nce.
Natur�l springs h�vc down- crosion in (oosc colluvium
cut 8" into soils
I':ti('13.n1'(' C-7
i ��
i
'I'rih. �l ('ollucl. L:xisting Mlicipatc�
Ilcm Kivcr Milc I'oinl ('�ilc�cn 1'rop. Prol• ('on�itions Find I'rohlcros Con�iitions �tnd Prohlems Rccommcn�f�l'tons I
2�, UO7?n I Cicolo�ry L3��nk failures of dclt�ic Incrensc� crosion of banks Intercept source flows in strcct
1ZM ,:t(1 ��posits (t�ncicnt I�kc) �nJ �tctcrioralion of h�ibitat. �rc�s and dircct to storm scw�rs
UiggcrcJ by un�crcutting; or suil�ihlc facilitic:s.
r�sponsc to incresisc� flows
from sirccts �bovc.
37 Ul)72n 2 llyarolobry 5414 Uctcntion facilily for If not corrcctcd, problcm Construct �ictcntion facility hcre
IZM 2.10 Rainier Ki�gc singlc-(amily will �ceply incise swale h�nk and Jircct n�noff from SC 3121h
plat ��p�carcd to bc �n� tr�nsport nn un��cccptul�lc St. to this location. Analysis �nd
funclioning, �il�hou6h onc volumc of matcri�l to slrc�m dcsi�n of facilily 'shouW c�libratc
scclion of Ucrm h.�d croded bclow. Incr��sc� n�noff from existing dcicntion facilities �nd
scvcrcly ,�nd nccds rcp�ir �rca soon lo I�c dcvcloped construct rctrofitting control
�n�f armor. Pipc dirccting will ��grav�tc slopc f�ilures fcatures to flllow all facilitics in
ro��side runoff from obseivcd. Rc�ch is of p�r- the subUasin to work as a complete
norih siac of SC 3201h has ticular conccrn due to adverse system.
fnilu�i, �inJ runoff hns impacts on st�le fish h�tchcry
cut ciitch Ihrou�h vcgc- immcdi�tcly downstre�m.
I.�tion 10 c�st, causing
si�nific�inl slopc failure '
on riFht bank of tribut��iy.
?� OO72L3 l Ilahi�at Culvcrt unJcr r��ilrond is incrc�isca sU•cnm downcutting Placc strict onsite controls on any
ItM .IO � fish hlocka�a Small an�i resulting h�nk crosion, future developmem tribulary to this
ephemcral stre<�m undergoing sidccutting, �nd sedimenta- dr�in�ge, since no �rea ezists for
somc b��nk crosion due to tion downslrc�m will occur. rcgional R/U.
incrc�isccl pcak flows,
?�) (1(17213 1 Gcolofiy Sill/cl��y lilholo�y cxposcd Nona Nonc.
R�1 .75 in bank.
I':S('13.n I'(' (:-8
'I'ril,. �� ('alicci. l:xitilinb Anticip�ilcd
Ilcn� Itivur Milc 1'c>int Calc�;c�ty f'r��. Prc�j. ('on�iilions iinJ I'rohlcros ConJitions F�n�1 Prohlcros Recommcn���tions
;t(l (1(172(' I Ilahit��t Snt��ll, cl�i�.5 5 slrc�m; poor Crosion nn� downstrc�m CstnUlish non�rosive stormw�tcr
IZM .IO fish h�ihil�i� auc to small scJimcn�ation incvit�blc if relc�sc ratcs an� volumcs for
sizc. S�rc,imsi�ic vc�cl�lion �cvclopn�cnt occurs. futurc �icvclopmcnt.
.inJ ov�rhui►J canopy in gooJ
con�li�ion.
:�I f)O7?t) I Il;ihilal Scvcrc crosion, hank fail- 7�hcro will hc morc movcmcnt Lst��hlish onsilc control for SIR
IZM .10 ures, sliacs, ��n�J sc�fimcnt of largc �imoimts of carth. stormwatcr.
cxist. '1'hcrc �re ironfixing
I,acicri�� from �ichris. nut-
f�ill from SIR p�rking lot
flows inlo Ihis tcihul��ry.
.l? Ot)7� I Ilahi�at llahilat in gooa condition. Mud�y watcrs on r�iny d�y show - Rc�ain natural strcam corridor,
l:M .3c)-.�)c) Nicc pools find rifflcs. crosional problcros upstrc<�m - Cnforce crosion conU•ol rcquirc-
somc �icbris �ams hut no from coUcction point 5. ments for ncw development.
fisl� hlockagcs. Strciun is
f��irly high, miiddy �nd
silly. (�crhesi� trces
aUunaiint, �s is strc�msi�ic
vegctation.
?:t (1073 1 Guolo�,ry 100- to 20Q-yr.-oIJ dubris Unstablc for constniction. Monitor during permit rcvicw pra�css.
12M .35 flow with rccognizable fan Itisky.
morpholo�,ry cmcrgcs from
n��rrow dr�iw. Mny h�ve hccn
triggcrcd hy lo�ging bcforc
lurn of ccnlury.
:�-� (1O73 I (;colo�,ry Sill cxpos�J in slopc Continucd hank recession, Evaluate tol�l system flows And,
ItM RM .9(1 failurc inJucc� hy Jcgr;icling af spuwning cnciromncnt. if pn�dent, devclop altern�tivcs
un�crcultin�. �o instrcam disc:hnrge of runoff
from dcvclopn�cnts.
I':ti('13.n I'(: (;.9 '
r,....
r�"'�� ,�
�3�,,v `�t,uv
'I'rih. �� (:ollccl. Lixitiling /\�ti�ipatc�f
Itum Itivcr Milc I'c�inl (',ilc ni I'rc�n. I'roj. Con�litic�ns ;inJ Prohlcros Conclilions ,�nJ i'rohlcros RccommcnJalions
z5 O�17:� I (;col�bry Silt cxroseJ in Continucd hank rcce�.sion, L'valuale total system flows an�, li�
ItM .'.�5 slo�c f�iihn•c ina�iccd hy dc�r�d��tion of spawning if pnidcnt, dcvclop altcrnalivcs I
unJcrculling. cnvironmcnt. to instrcam dischargc of n�noff from
dcvclopmcnts. I
��i (l(17:i I (ic<�loby I.iucr anJ Jchris blocks PcrioJic brc�kout could Clcan ow and restore to n�tural
1ZM I.00 strcam chnnncl. Irirgcr floo�fing. condition. ',
37 OO73 5 1 fyJrology ncceler��ted h�nk erosion As are� nbove TriU. 0073 Puturc developments aUov� "i'riU, 0073L3
of nr.iin ch�inncl due lo dcvelops, crosion of swale should use infiltr�tive capacity of
incrc;�sc�l runoff upstrcnm. th��t conveys it will cxperi• soils in the arca as feasiblc: to
't'rih. 0O73[3 capericncing cncc incrcasing c�p�city ccducc runoCf. Ucvclopmcnts �djaccnt
s�;rio��s inst�ihility ne�ir prohl�nts. Incre�se erosion to mnin streum ch�nncl shouW provi�e
canflucncc wilh m�in stem will occur �s stream attempts n�icqu��te sclU�icks from slopes lo
duc to acvclo�ment. (Sce to seek ncw cquilibrium prcvcnt slope failure. '�
gcologic apPcn�fix.) capacity.
:i��t (1(173 5 Cicology Confluence wilh trihut�ry; None. None.
ItM I.(>0 crosiontil culs suggcst
rcccnt floo� r�►iscd strc�m
3' ab�vc cxisting flows.
�') ()()7:� 5 Il�il�it:�t Il�il�itat in good condition. I3ank erosion will occur from - Plant some trees in floodplain.
12M I.<,0 Silt in suspcnsion; livc- prescncc oC lives�ock. corridor scction.
stock havc �icccss to strcam. - Put in some drop structures
to create pools.
aO OO7z 7 (�colo�,ry C;entl� (2Q^/r�) siJe slopes in Slight incrcase in high flows None.
ItM 21.5 �aslurclunJ. No cvi�lcncc r��ora����o�,�i to dcvclopcmnt
c�f crotiion, hut floo�ing upsU•c��m.
rc�o cl cci,
1';SCL3.nl'(' C-10
'I'rih. .� ('ollcct, lirisiin� llnliciputc�l
I�cn� Rivcr Milc I'c�inl ('aic�;c�iy f'rc��. 1'rc�j^ Con�liticmti �ind I'rohlcros ('onJilions una Prohlcros Rccommcn�ations
-1I OO7� 7 Ily�rc>lobry UnJctcrminuJ sourcc PI'OJuC- I.ACiIII'LCII capacity problcros No rcgional f�icility proposccl for
ItM 2.I S. in� suhsl�intial suspcndcJ will bccomc moru evidcnt �s this lributary �uc to lack of obvious
�.5�1 lo�ia of silt in �rinu�,�ry. ��rca ac�etops. location, but basin plan may justify
Slr�am a�cyualely ticcommo- onc.
claling incrc�isc� runoff
front upstrcum Jcvclopmcnt.
a3 O117:� 7 (;cc�lo�;y Strcam crossing with ninoff Slifiht flooJing. M�i�tain distance from 25•yr. floo�-
I:M 2.55 of S-1A cfs. C:vi�cncc of pl�in using 3' <<bove existing flows
shorl-Juration floo�fing. as minimum ��idcline.
43 OO7� 7 Gcolo�y C:vidcnce for sidecul�ing Widening and undercuUing of None.
ItM 2.��(l G" .�hovc cxisting flows. h��nks in response to nddcd
flows.
a�l OO7� 7 C;col��,ry On lill soils, h0'-widc Nonc. Provides good index Nonc.
IZM 2.�)5 floo� pl�iins 1.S' above for cv�iluntion of system.
cxisting flows with
cvidcncc for a�cfition�l
1.5' dcplli.
a5 OO7:� �) IlyJrology 540? C�;tcnsivc cxisting Wcllnn� I�illing may occur in �re� Monilor wetl�nd for filling; take
RM �,15_ 5450 is currcnlly proviJing �long north bordcr of action to obtain restoration if
�.��5 R/U huffcrinE Ihe flow wetlanJ to incret�se amount this occurs. Enforce weUand
b�forc il pi��.scs into of polcntial commcrci�l rc�l protcclion rcgul��tions.
chann�l through King County cst�tc. Sub�rc� �Icvclopmcnt
Ilousing l�ulhority �icvelop- m�y c�usc loc��lized c�p�city
mcnt. prohlcros in lowcr rcachcs.
-1�; Ot173 7 (;colc��y In houtiinb �cvclopment, Coniinucd erosion �roun� Provi�ie some armoring as b�nk protec-
ItM �.2�4 �rosion ��roun� culvcrt slruclurc. tion (ripr�p).
cntrancc 2' �ihovc cxisling
flows.
I':ti('l3.nl'(; C-I I
��; . � �
'I'rih, �� Co�lcc�. Lxisling /lnticipatc�i
licm Rivcr Milc I'c�in� ('a(u�oi t�rop. Proi, ('on�i�ions ,�nd 1'rohlems Con�i�tions and Prohlems Recommendations
a7 OO7t 7 (icolocry Pcat ovcrlics till in Nonc, Nonc,
1ZM 3.�5 wctlt�n�l a►•c��.
�3ti O(17:i �) Il�ihiiat Inslrc�im hahitat is poor Morc flooJing wilh incrc�sed - Cstahlish more reslrictive controls
ItM 3.��O- auc to lack of ovcrhead strc�imhccf ancl bunk crosion on volumcs and ralcs of rcic�se for
�•��1 canopy F�n� stre��mbank will occur. developments.
vcgcl<ition in sonte a�'e�s. - Work wilh landownc:r to providc
I..ivcstock h�vc ��cccss to fcncing unJ n���ural vegututivc
stro��m; hanks h�ve becn buffcr along stream.
cro�lcJ in somc arcas.
Q') OO73 �) (;colobry Strc�im occu�ics sw,�le in None None.
I:M �1.4 rolling tcrracc. No
crosion��l strc�.s.
S(1 (l(17:� 12 Ily�rolobry SdOh No si�nific�nt p►•ohlcros. Arc� planncd for only slight ruturc basin plan should consi�icr
RM �.75 ndJilion�l dcvclopmcnt. No Wetl�nd 5444 for detention facility
problcros �nticip��tcd. to �ssist in �Ilcviating downstrcam
cap�city problcros.
51 (1(173L3 5 llahi�at Paor fish habit��t. Small Increased Uank erosion will Cstablish nonerosive stormwater
RM .10-,30 strcnm with b�nk erosion accur. rcle�se rutes �nd volumes for
�in�i ���.sociale� pasture future developments.
wilh livustock.
I':ti('13.n1'(: (;_�?
'I'rih. �� ('ollcct. Lxis�in� MticiratcJ
lium Itivcr Milc I'oint (',ilc�;ory I'ron. 1'roj. Con�tili<ms �in� I'rohlcros CcmJitions ana Prohlcros R�commenJations
53 OU7� I,�1 Ilyclrolo�y S41S Moslly �mauvclorc�l; high 1'ulurc aevclopmcnt offcrs Construct proposed tightline projcct
ItM .:�O-,SO percontu�;� of opun ficl�ls opportunity to conslrucl lo prevent failurc o[ ro.id
�in�l p�ist�n•cs. 13ank erosion rcgional dctcnti�n facility, cmh��nkmcnt �nd transport�tion of
�lon� wctit si�lc of SL 312th �is un�icvclopcd �rc�i consists mtUcri��l to scnsitivc ntain crcck
W<iy Ihru�Ucns intc�rily of scvural I�irgc, contifiuous rcachcs.
of roaJwuy. p�irccls. 13unk unJcrcutting
will �cccler:�lc, causing failure
of ro��lw�y tilong ]0(l0' of
S� 312t1i Wny if only norm�l
dctcn�ion rcquircmcnts mct.
Incrc�scd ninoff from suhhasin
now dcvcloping will �ggravatc
slopc fuilures und a�7vcrscly
imp<ic( st�►tc fish hatchcry
downst rc.�m.
51 (1O7a 1 Ilahitat II<�hil�it clownstream of SL Increase� flows m�y cause - CIcAn out debris.
1ZM .5O 3121h W��y. Culvcrt is scour �nJ bnnk erosion. - Provide R/D as needcd at top
improvcd from RM .50 but of ravine.
only m��rginally, Lots of
dcbris in strcam.
5� OO7�4 a lI<ihitat IIiIIsiJe an�1 ro�d sliding B��nk erosion, sedimentation Armor stream bank �nd
RM .��O into strcam <it USGS stre�m �nd roaJ f�ilurc exist. This rcinforce road.
�uugc �t RM .1Q. llabit�t wiU be � Uig problcm with
poor for fish duc to dcbris, incrc�sc� flows in future.
roacJ, ��nc1 crosion prohlcros.
I':Sc'13.n1'(' C-13
� �.��
^�Y'r
'I'rih. .� ('c>Ilcct. L;�;isting nnlicip��tc�l
Ilcm Itivcr Milc I'c�inl ('�ilc�o� I'co�. 1'roj. Con�lilions a�nJ Prohlcros ('on�filions an� Prohlcros Rccommcndations I
SS (1O75 �, Ilydrolc�rry Uuc lo rcl�ilivcly slifiht No prohlcros �nlicipatcd as Nonc.
RM .33. �ic�;i•cc of �cvclopmcnt, �rcu is rlanncd to dcvclop
1.=!O Ihcru �io not ��pcar to hc only slighlly.
�ny si�nificant prohlcros
��t Ihis limc.
5�� (1O�t I �) I lahiiul No major problcros olhcr Nonc. - Mainlain strcam cocri�ior and '
IZM .IU Ihan lack of ovenc�,��l canopy buffer.
from Ic��.S of trccs, vcgcta- - E:ncour�ge owner to fcncc stream I,
lion. [rom �nimals.
S7 (1O�t I 9 (icolo�,ry Culvcrt 2.S' X 2.5' passcs Incrcascd flows will h�rve Idcntify hydrocarbon sourcc �nd
1tM .f>3 under ro��d. Irridcsc:cnt minor incrc�se in soi) test lo ev�luatc pallutnnls.
hyJroc�rh�n shccn notcd on crosion. WouW bc bcncficial lo isol�lc
surf�ca Somc minor sidc- livcstock from sidcbank �rc�s and
I��nk s�:our noted. es�ablish vegetation on banks for
erosion control �nd filtrntion.
5��t (1t)��tl ') II<�hitat Strc.�m has bccn ditched I3��nk erosion will occur. - Reveget�te stre�msidcs.
RM .�i2 throubh p�isturc. Uirt - Cncourage owncr to fcnce off stream
bunks cxposcd with fcw or from livcstock.
no trccs to shacle stre�m.
I':�('13.n1'(' C-14
'I'rih. .l ('c�llccl. Lxisting Anlicipalc�l 'I
licm Itivcr Milc 1'c�inl (',il��,y 1'rc�n, Proj. Con�ilionti �in�i Prohlcros Ccmclitions �nd 1'rohlcros Recommcnda�ions !
S`) O(1'�I � IlyJrolo�,ry 541O I��kc McriJi�in arc� nc�rly Arc� trihiit�ry to lake is I3�sin plan should consider
IZM I,IO cnlircly �cvclopcd wilh ncarly complclely devcl�pc�, modific�tion of I��kc Mcridinn outict
singlc-family r�si�unccs. s� liltic changc is �ntici- to providc considcrably morc dcten-
l.�ikc acls �s suhrcgion�l palcd for syslcm. nrc� sou�h• �ion with vcry minimal �Itcrntion i
rccciving bo�iy is cffca c�ist of lakc h�s yet to fully of lakc Icvcls. 'fhis could substan-
livcly huffcring runoff �Jcvclop �inc! potcntial exisls tially rcduce futurc c�p�city ',
lo Jownstrc��nt rc�chcs. for loc��lizcd convcy�ncc problems immcdiatcly downstrcnm. '
Somc polcntial for flooding cap��city prohlcros lh�t shouW I
of mohilc homc park down- bc ���resscd by downstre�m
strcam of I�kc duc Io �n�lysis for ncw devclopmcnts.
po�.sihlc Iimilcd c<�p��city I�
in pipc �lischarging from
onsitc ponJ.
hO (1O��I n 1� I lyJrolobry S4Q9 Ucvelopment is c�using in- C�pacity problems will Construct berm and control structure
ItM .17- cre�sed c�pacity proUlcros increase �s upstream Areas at outlet to Clark L.ake to possibly
2.�15 t�nJ resulling incre�se;d are �cveloped. "detAin" runolf and help reduce
volume of run�ff, acceler- flow downstream. If a high-densily
ting cr�sion of strct�m mt►Iti-family projcct is propscd
cl��inncl in sul,divisions near Inke, �s is likely, there
nc�r ��If coui:sc, would be opportunity to develop
berm and control mcasures.
Address c�pacity problems at Clark
L.��ke hy ch�nnel �rmoring or
Urs�Z��� ��r�.
��I (1O�)In 13 llahilat nitcrcJ portion of strc�m �uturc problcros only likcly Placcmcnt of somc largcr rocks to
IZM .2U duc to road constn,ction. to bc scouring of sm�llcr crcntc pools and cddics.
All rifflus wilh fcw or no rock Jurin� pcak flows, �uc
�OOIS. l�IIJCI' SllilllC.l' Sll'Cillll lo import of rock
W���.
r:sc'13.n I�c� c:-i s
,
i�,Y;,� .��
'I�rih. �� ('c>Ilcct. Gxislin�; I�ntici�atc�i
licm Itivur Milu I'oint ('�i1� I'rc��. I'rc�j. Conaiiicros �n�t Prohlcros (:on�lilions ��nd Prohlcros Rccommendations
��3 O(1')I n I:� 1 I�ihilat Slrc�im h�is Uccn dilchcJ �n� M�rc hnnk crosion �nd St��bilize bank �nd shadc strc�m by
IZM .:�O most strcamsi�ic vc�cl�ition scJinwnlalion of ch�nncl planling na�ivc vcgct�Uion.
rcmovc� lhrough ��If course. cxpcctca.
Sonic h��nk crosion occurring.
Vcty littic ovcnc���d vegc-
tation tilonrsi�ic strct�nt.
�;3 (1O'>In l:� Il�ihil��t Gao�i sU•c�msiJe vcgclative "I'herc will hc �dditional loss - Cnhance use of Clark L.ake as R/D
I:M 1.2O- cover cxcepl through of n��tive vegett�lion along- facility to reduce pe�ik [lows.
2.�O si,<�rr�ns ccntcr. Ovcnc�aJ si�c strcnm. Morc flooding - I�urth�r restrict stormwatcr
c��nopy vnrics Uy property. �n�1 crosion will occur. rF�te �nd volume ret�lc�se r�tes.
���3 OO'.�I l3 I S I lyarolo�,ry SaO7 Modcratc �m�unt of current I..oc�lixed clpacity problems Protect and possibly enh�nce wctland
ItM .��2 dcvulopmcnt. Wctl�inJ 524Q m�y occur in upl�nd tribut�iy as upper �rca dcvclops.
proviacs R/U, protacting as �rcas devclop. Wctland,
aowntilrc��m ch;inncl from if prescrvcd, will continuc
inc:rcasc� volumc of runoff to providc R/U for incre�scd
,is �rc;i acvul<�ps, No sig- flow guncr�tcd hy ncw acvclop-
nificant prohlcros in arca. mcnls.
��5 OO'�3 3 C;colo�y i.iltic Sc�os Crcck nc�r norlh Nonc. None.
ItM .10 m,ir�in of Covington Channcl.
No rcportca or obscrvc� flow
or crosion prohlcros.
�i�, (1O�)2 3 (;col�ry Ucl�ris �n�l bank erosion Incrcased bank erosion is ReJuce storm flows by use of stricter
1tM .:�O founJ. capcctcJ. stormwatcr controls, new R/D facili•
tics, and fencing of stream.
incrc�sed flows.
1';S('13.�11'(' C-1(i
'fi Cc>Uccl, L?xislinc Anlicipalccl
Itcm Ri_ �lilc I'oini ('atc«oi I'ron, Prc�j. Conailions �in�l 1'rohlcros Conailion5 nn�i Prohlcnts Rccommcn�ialions
(>7 O(1�)? II Ily�rolo�;y S:�I(> l.illlc Soos Cr�ck trihiUtiry !�s Jcvclopntcnl conlinucs, No t�pparcnt suitablc siles for
ItM .35-I.(,9 h�s h�cn cont��inca and m��r1i- exisling cap�icily prohlcros rcFion��l dctcntion facilitics lo hclp
curc�l as il p���,tics Ihrou�h will hc furlhcr �figr�rva�cd by rcduce flow cntcring prol�lum r�E►chcs.
plats. 'I'his has rc�lucc� incrc�isc� volumc of runoff, Address incrcasca ninoff volumcs lrom
c�ip,ici�y of slrc�im in kcy whicl� prcviously w��s ahlc to ncw �1cv�lopmcnts with infillr�ilion
urcas wl�cru resullant cnlcr �roun�wc�tcr systcro systcros whcrc fc�siblc. Ch<inn�l
channcl ovcrtorping causcs Jircc�ly. cupacity cnhanccmcnt projccls (such as
flo��lin�; of sc�mc homcs scmi- Projcct S41(�) should bc constnicicJ
ycarly. to prcvcnt furthcr property d�m�ge.
l3�sin pl:in shoulJ� address potcnlial
of dctaining ninoff from upstrcam
tributnry arca to allow for incrcascd
flows.
�,� t1(1��? I I Ilal,it�i� Instrcam huhi��it is good. Incrcascd flows will cause Cslablish undisturb�d stream
RM .(iS Str�i�m corridor mos�ly in floo�ing �nd erosion. buffcrs.
goo�i con�iilion. M�inicurcd
lawns nin down to strcam in
placcs.
�
�i`) OO')2 1I Il,ihi��it Some Jchris found in stream. [3ank erosion, flooding, and - Stricter control on R/D release
RM I.��O Il<ihitat gcncrully good. sc�im�ntation likcly to occur. rales and volumes should be
est�blished.
- Maint:�in natural buffer along most
of ch�nnel.
7O (1(1')3 1�3 (;colo�,ry Mcandcring se�ment of Polentially unsl�l�le b�nks If construction were considered,
ItM 1.70 l,i��lc Soos; po�.sihlc woula �ffccl construction. rccommcnd cvalu<uion o( soils �nd
colluvi�il crccp in ���ijaccnt stability of sitcs.
siachank �rc�is.
71 OO�)2 I•1 lly�lrolo�ry I,il�lc currcnt dcvclopmcnt. �1s acc<z �icvclops, chnnncl I�uture dcvclopmcnts shoul�i
I:M 1.7(1- No signific�nt Prohlums capacily prohlcros will bccomc utilizc infiltr�ilivc capacity of
?•��S othcr than somc localizc�i morc cvidcnl ��nd increased soils to re�ucc incrc�sed n�noff
h�ink ovcrlo�ping in rortions erosion will occur ns slre��m volumcs. Provide adequ�le flooding
� of main rcach. Innun�i��lion at�cmps to scck ncw cc�ui- prolecti�n for fulurc runoff con-
' will likcly hc limitc�i to lil,rium cap�icity, clitions.
�i�ijaccnt ii�ricultur�i) I�in�,
i�:�c�i3.ni�c c�.i�
(�� �
�.>�<� �
'I'r.. . ._ ('c�llcc�. L;xisling Anticip�itcJ
Ilcm Itivcr Milc I'c�in� (';►Icfic�iy 1'ro�. I'roj, Conailions ��nd Prohlcros ('on�ilions ��ncl 1'rohlcros Rccommcnd�itions
7� OfN)? I-1 (icolo�,ry Pot�nliul for flooJing in Po�.sihlc floo�ing (ntinor). Consiacr upstrctun dcicntion.
ItM ?fi0 low ,irc�is; vciy low sicic-
SIO�CS.
7:� (1(1`>? 14 Ilahi�,it Somc cJchris found. Bank crosion and seJiment�- - Cst�blish stricter control on
I2M 3.�() tion likcly. R/U rcic�sc rates �nd volumcs.
- Maintain nntural buffcr �long most
� of channel. I
7•1 O(1�)? I(� Gcolo�ry Chccbank flows. Possihlc flooding (minor). Cansidcr upstrcam dctcntion.
R M 3.:i 5
7S O(1u2 I�i Ilahitat l.o�s of s�nd in hcdlo��d. More sedimentalion likely, - Cstahlish stricter control on
RM �.40 StrcamsiJu buff�r gencrally ��s wcll as bunk crosion �ina R/D rcicasc rutcs an�l volumcs.
goo�i. flooding. - Maintain natural buffer along most
of cl�anncl.
7�> 0O92 l�i Gcology Rcsi�ent rcports trccs down Some continued erosion. Some cle�n-out of trees and
ItM 3.4U in slrcam �nd sidch�nk limiled armoring of banks would be
crosion cvidcnl. Uenefici�l.
77 (1O')2 1(i IlyJrology 5412 1..ittle current devclopment. No prohlems nnticip�ted Consider Wetlnnd 5480 for a
ItM 3,�i5. somc loctilizcd bnnk ovcr- ns vcry littic nddition�l detcntion site, in A Futurc basin
4.75 topping in portions of main dcvclopmcnt is planncd for pl�n, in ordcr to allcvi�te down-
rcncl� I�ut inmind,�tion is tl�is �rca. stream capacity problcros. �
proh�hly limiic� to ndj�ccnt
agricullural I��n�.
7� OO�)2 IG ll;�hil��t Strcam ditchcd. I.ittic I3ank erosion �nd flooding of - Work with IAnd owncr to fence off
RM 4,O0- slrc�msiJc vcgctation �nd now "improved" pasture will stream.
a•�f) no overhe��a c�nopy. Some accur. - Plant n�tive vegetation buffer.
livestock-rcl�ilcd crosion
ana runoff.
7�) OO')2 I�i (;colo�ry Or.ingc iron prccipit�te Somc I�calizc�l oaygen Natural dcposition as iron is
IZM a.��5 notc�i in strcamhcJ nc�r dcplction of fish h�hit��t. exchangcd for oaygen.
outlut to I.��kc Yoimgs.
1':S('I3.nl'(' C-13
'I'rih. �� (:c�licct. Lixitilinr Anticipa�ca
I�um I:ivcr Milc I'c�int C,i�c�oi 1'rop. Proj. Con�i�ions tin� f'rohlcros ConJilions an�i Problcros RccommcnJations
�tiO OO')2 I(, Ilahil�il Ir�n-fixin�! ha�luria un� Nonc, None.
ItM �l.�iS u�.5c>cialc�l oJor prescnl.
Sourcc unknown, l.��kc Youngs
rcicasu ralc is I111f11111U111
� 1:�.
�I OO'�3 I-� (lahi�al Vciy sm�ill trihulary with Lrosion �ind flooding from Reduce storm flows by usc of sirictcr
ItM .(1(1-.�7 un�cfinc� channcl in placcs. fulurc �lcvclopmcnl likuly. stormwaler conlrols, ncw R/U
Ilahila� v;�luc for fish is f�cililies, �nd fencing of strc<►m.
low.
ti2 OO'):� I�# (;cc�lo�y Po�rly �Icfinc�l slrc,�m Nonc. None.
I:M O.�5 ch��nncl with no cvi�icncc
of �rosion.
�ti� (1(1')-1 13 (;colo�y Minor sicJchnnk crosion Slifiht cnlnr�cmcnt of l.ocal �rmoring/riprap �pplicd by
IZM O,:�O hclow convcrficncc of lwo crosional fcnttires. owners woulJ re�iuce impac�s,
culvcrt/ci•ccks.
ti�l O(1'>-I 13 llahi�a� Strc�imsiac vcnclation has Thcrc is � possiUility of - Provide stormwater control
I:N1 .O.30 bccn rcmovcd hy lobging. b��nk crosion duc to incrc�sc�l - Est<�Ulish stream corridor_buffcr.
flows from dcvclopment. - Improve stormwatcr control.
�S (1e1'>-� I:� llahi�at Impor���nt: 'I'his is � s��lmon Mor� bank crosion will occui�. - Cncour�ge property owners to fcnce
ItM I.t)O spawninfi slrc<�m. Somc bank strenm.
crosion prob�ibly duc lo live- - 1'rovide stream corridor buffcr.
s�ock. - Improvc s�ormwater control.
��� (1c)'�-1 I� Ilahi�at '1'h�rc is rivcrinc wetl�ind Nonc. Maint�in wctlands and stre�m corridor
Itti1 I.Sq jusl cast of lShth Avc S�, in nalur.tl slatc.
i�:sc��3.ni�c� c;-���
� :. �, �"`?�
�.�:�;' M. �r°'i°''
'I'rih. �l ('c>Iluct. L:xis�ing Antici��itc�i
I�cm Itivcr Milu Poin� (',ilc�oi I'ron, I'roj, Con�lilions ��n� Prohlcros CcmJi�ions �m� Prohlcros RccommcnJ<itions
�7 O(l�>5 17 Ilahilal Snt�ill, c�hcmcral slrc�im Nonc. Cnc:ourage property owncr to fcnrc
I�M .�S-,`�S fl�wing throu�h pasturc. slro��m.
I,ivcslock c��using hank
crosi�n.
��ti O(1'�Sn I�S Ilahital UilchcJ �irca; lols of ConlinucJ filling may Muinlain strc�m corridor. Cnforcc
ItM .(1O-.3� �Jchris. occur in floo�i pl�in. grading and I'illing orJinance.
ti'> OO')Sn I��i Ilahil�it Uchris cxisls in s��lmon 'l�his will h�vc minimal effccl M��intain slrc�m corridor in
IZM .��5 s�,iwning �irc��. on habitat. natural condition.
')t) O(1��7 I�� Cicolo�y Struam flowing throufih Continuing �d,justment will The key word is "equilihrates."
IZM .:�5 Juvclo�mcnl shows minor bcd occur �mtil syslcm cstahlishcs Disturbancc of thc naturul syst�m
�nJ hank crosion �s strcam � mnturc, �cvcloped w�tcr- h�s initi�tcd or indiiced rea�ijustmcnt
cquilihra�us lo ncw ch�nncL coursc. in the Ucd as a function of new
gradients, m�teri�ls, and other �
hydr�ulic factors. In tim�, thc
strcam will cstaUlisli itsclf in
�nother "natural" cquilibrium,
nssunting no ncw v�riablcs such as
adJed flows or alteration of channel
gcometry �rc introduccd.
vl OO�)7 IS Ilahilat Ucbris �in�i fill in wctlanJ. Morc fillin� m��y oc:cur. Cnforc� grading anJ filling ordin�nce.
RM .�5
I':ti('L3.nl'(' C-2Q
�
i
I
;`�
. i
I
TASK 3 I
FIELD INSPECTION
1
il
I
�
i
I
i,
li
�
�
EXHIBIT J !,
OFF-SITE ANALYSIS DRAINAGE SYSTEM
TABLE
�
�
OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE
Surface Water Design Manual, Core Requirement #2
Basin: Green River Subbasin Name: Bi�Soos Creek Subbasin Number:
Symbol Drainuge Component Drainage Component Slope Distance Existing Potential Qbservations of Field I
Ty�e,Name,and Size DescripUon from Site Problems Problems Inspector
Discharge Resource Reviewer,or
Resident
Sre St�p I}pr shcet tlu�.�.,��ale,titrcain, Uraina�e ha�in, cegrtauu��,co�rr. � Ft Constnenons,u��drr capaci[}�,pondmg, Tributary area,likelihe�d of problem,
channcl,pipe,pond;size,di�uneter, dcpth,rype of sensitive area,volume overtopping,tlooding,habitat or overtlow pathw,�yy,po[endal impacts
surface area organism desWctioa,scouring,bank
sloughing,sedimentadon,incisioo,
other erosioo
1 Sheetflow from site Across grassy area of vacant 5 0 to 100 None noted None noted
lot to east
2 Pond,50 feet by 30 feet At low area of vacant lot - 100 to 150 None noted Nane noted
3 12-inch ductile iron pipe Flows to east 1 150 to 170 None noted None noted
driveway
4 2-foot bottom swalelthrough Flows east behind homes 1 170 to 435 None noted None noted
thick vegetation
5 Ditch,rock-lined, 3-foot 2 feet deep, flows south 1:1 1 435 to S I S None noted None noted
bottom side slopes
6 1 - 36-inch RCP Under Petrovitsky Road 515 to 685 None noted None noted
1 - 36-inch steel pipe
7 Wetland channel thickly Flows south, 15-foot bottom 2 685 to 1,585 None noted None noted
vegetated
8 Big Soos Creek 1,585 to 3,000 None noted None noted
9 (2) 30-inch RCP culverts Under South 182nd Street 3,000 to 3,020 None noted None noted
7721.006 [JPJ/ath]
TASK 3 FIELD INSPECTION
'There were no problems reported or observed during tt�e resource review. Based on the review of
the drainage complaints, which were numerous in the downstream drainage course, there were
absolutely no development condemning type constrictions or Iack of capacity in the existing
drainage system nor did the field reconnaissance find any potential constrictions or lack of capacity
in the existing drainage system downstream from the site.
3.1 Conveyance System Nuisance Problems(Type 1)
Conveyance system nuisance problems, in general, are defined as any existing or predicted
flooding or erosion that is not constituted as severe flooding or erosion problems. Conveyance
system nuisance problems are defined as flooding or erosion that results in the overflow of the
conswcted conveyance system for runoff events less than or equal to a 10-year event.
Examples include inundation of a shoulder or lane of a roadway,overflows collecting in yards
or pastures, shallow flow across driveways, minor flooding in crawl spaces of unheated
garage/outbuildings,and minor erosion.
Based on the review of the drainage complaints provided by King Couniy, there is some
evidence of conveyance system nuisance problems occurring downstream from the site. First
the property to the east of the subject site located at 17409 126th Avenue S.E. has a pond on
his yard which has a culvert draining under bis driveway to the east. Appazently the property
owner east of him has been filling his backyard and the property owner at 17409126th Avenue
S.E. regraded the other property owner's backyard without norifying him so his upstream
property would drain. This is consistent with past drainage in tt�e area and e�cists so that the
pond functions as its intended purpose and dces not flood his driveway at 17409126th Avenue
S.E. That complaint has been mitigated. Second, another drainage compIaint found that
flooding was occurring in the back yard of a large Iot located on 12601 S.E.Petrovitsky Road.
This is adjacent to the downstream drainage course from the subject property;however,it is
not on the drainage course. Apparently, the drainage course has standing water in it all the
time and may,during high flows, seep into his yazd through groundwater migration. Based
on these conveyance system nuisance problems>this project proposes to mitigate by providing
Level 1 Flow Control, and adding additional flow control such that the project will hold the
10-yeaz peak to the overflow T�peak matching the 10-year peak to the 2-year storm event pre-
developed conditions peak.
3.2 Severe Erosion Problems(Type 2)
Severe erosion problems are defined as downstream channels,ravines,or slopes with evidence
of or potential for erosion/incision sufficient to pose a sedimentarion hazard to downstream
conveyance systems or propose a landslide hazard by undercutting adjacent slopes. Severe
erosion problems do not include roadway or minor ditch erosion.
Based on our site visit and the King County drainage complaints, there was no evidence for
potential erosio�ncision sufficient to pose a sedimentation hazard to downstream conveyance
systems anywhere along the downstream drainage course.
77�1.007 [JPJ/byl
33 Severe Flooding Problems(Type 3)
Severe flooding problems can be caused by conveyance system overflows ar the elevated water
surface ofponds,lakes,wetlands,orclosed depressions. Severe flooding problems are defined
as follows:
• Flooding in a finished area of a habitable building for runoff events less than or equai to
the 100-year event. Examples include flooding of finished floors of homes and
commercial or industrial buiidings. Flooding can occur in electricaUheating systems and
components in the crawl space or garage of a home. Such problems are referred to as
"severe building flooding problems."
• Flooding over ail lanes of a roadway or severely impacting a sole access driveway for
runoff events less than or equal to the 100-year event. Such problems are refened to as
"severe roadway flooding problems."
As mentioned previously, there is no evidence of flooding from the drainage complaints or
from our site visit downstream of the subject property that would constitute a severe flooding
problem. The upper one-third of the downstream drainage course currently courses through
mostly residential land where the lots have been graded to some extent; however, it does
course through thick vegetation as well. T'he downstream drainage course in tbe lower
two-thirds and even farther down is through wetland which consists of trees and brush and
thick vegetation which is impassibie by human being without taking a machete or a chain saw.
The portions of the downstream drainage course investigated by this site visit and a review of
the soils map indicates that the downstream drainage occurs through Alderwood,Everett and
Seattle Muck type soils which are all different type soils including till,outwash,and wetland
type soils. 1fie field reconnaissance for this Off-site Analysis Drainage Report was conducted
on August 9,2001,in the moming. The sky was partly overcast with occasional sun breaks
in the moming. The high temperature on this was 80+degrees.
772].007 [JPJ/bql
TASK 4
DRAINAGE SYSTEM DESCRIPTION AND
PROBLEM DESCRIPTION
�
TASK 4 DRAINAGE SYSTEM DESCRIPTION AND PROBLEM DESCRIPTION �',
Runoff leaves the site by sheetflowing off the eastem property line down a 10 percent grade for I
approximately 100 feet where flows then enter at 50-by 30-foot stagnant pond with algae blooms '
and lily pads. Runoff leaves this pond which is on a property owner's front yard by flowing under �
a driveway through a 12-inch ducUle iron pipe culvert which flows into an area which has a swale
flowing in a easterly direction with a 2-foot bottom through thick vegetation behind a couple of li
residences discharging to a rock lined ditch with a 3-foot bottom width that flows in a southerly i
direction for approacimately 80 feet until entering a 36-inch concrete pipe and a 36-inch steel pipe '
flowing undemeath S.E.Petrovitsky Road for 170 feet discharging on the south of S.E.Petrovitsky
Road into a channel type wedand area,thickly vegetated drainage course that flows in a southeriy
d'uection through a wetland area for approximately 900 feet until it flows into Big Soos Creek. It ',
is then conveyed through a large wetland area documented within this report for approximately '
1,400 feet until passing through two 30-inch RCP culverts under South 182nd Street. Flows ,
continue to course in a southerly direction through Big Soos Creek. There were no problems found �,
on any portion of the downstream drainage course from the project site either e�cisting or potential.
Review of the drainage complaints,Exhibit K,showed that there were some complaints conceming '
flooding and miscellaneous other types of complaints in the downstream drainage course within
a mile of the site. We have investigated the enclosed complaints that we believe to be neaz the
downstream drainage course based on the complaint list. The following is a review of eacb !
complaint ordered from the King County Surface Water Management Division. �
� Complaint No.90-071: T'his complaint is not in the downstream drainage course and was resolved
I prior to King County personneI visiting the complaint area.
Complaint No. 91-0031: This complaint is not on the downstream drainage course.
Complaint No. 91-0852: This complaint is not on the downstream drainage course.
I
Complaint No. 91-1087: This complaint is not on the downstream drainage course.
i Complaint No. 93-1059: This complaint is not on the downstream drainage course.
;
Complaint No.94-0128_ This complaint is about the property owner cleaning up his property and
I then was referred to the Permit Department of King County.
Complaint No. 94-0450: This complaint is not on the downstream drainage course.
Complaint No. 94-0781: This complaint deals with the diversion of Big Soos Creek; however,
King County could not find any evidence of this occurring so this complaint was resolved with no
action.
Complaint No. 95-0649: This complaint is not on the downstream drainage course.
Complaint No. 95-0790: This complaint is not on the downstream drainage course.
��21.00�[.rn���
Complaint No. 96-1135: Tlus complaint is located on the upstream side of the subject property
and has been resolved because King County added catch basins to this area that was flooding in
the roadway of 125th Avenue S.E.and thereby alleviating this complaint from future consideration.
Complaint No. 96-2050: This complaint is located adjacent to the downstream drainage course
and may be caused by heavy runoff within the downstream drainage course overtopping the
drainage channel and spilling into the back yard of an existing residence. This is not impacting
the house,driveway,or roadway. T'he property owner is looking for ways to mitigate that standing
water. Do not l�ow if anything could be done about it other than providing the level of flow
control which our project is proposing to do.
Complaint No.98-489: This complaint was resolved and is the same as Complaint No. 96-1135.
Complaint No. 99-0466: This complaint is on the downstream drainage course, but when the
complaint was made,the property owner was prevented from filling in the pond and impacting the
complainant's property. No change was made to the downstream drainage course.
Complaint No. O1-0109: This complaint deals with an adjacent property owner grading on the
complainant's property to allow runoff to drain from the adjacent property owner's property
through the complainant's property. This met pre-existing conditions so runoffcan course through
the property; however, due to filling and miscellaneous activity over the years, the adjacent
property was not allowed to drain. T'his was resolved by King Counry.
7721.007 [JPJ/bq]
EXHIBIT K
DRAINAGE COMPLAINTS
.i t�.31.ZE101 10=54f�1 KC l LRD NO.590 P.5i 11 II
��li Wate�"�Lan�Sesolrces Dlv�an-��rvla��ec�n �O b � �7�.I
��� Printed: 7l31/01 9:18:06 AM
�t � Typs Of P�hl�ll A�'@3�df Pf4b19AI L�9Dtf lbl'08 P8Q8 I�
� �
1974-0116 C DRNG 12517 PETROVITSKY RD SE CASCADE VISTA PLAT AR�A 656F7 -�—
197�01�8 C FLDG 12210 5�PETROVI7SKY RD 656F7
1977-0073 C DRNG 116TH AVE SFJPETROVI HEADWATERS/SOOS CRK 656E7 ,
1982-0224 C FLDG 11325 SE 1�6THST '
CASCADE ViSTA 656�?
1982-0515 C MISUSE FAIRWOOD PRK DIV#7 EASEMT/SE 173RD/1347H PL SE 686G1
1982-0548 C 918TH /S� 175TH ST DEPl.E710N OF WATER TO PONp 656E7
19B3-0361 C DRNG 12 711 SE 176TH ST ILLEGAL FfLL 656F7 �—
1963-0406 C FLpG 12210 PETROVITSKY RD SE CASCADE VISTA AR�A 656F7
1964-0291 C 11417 SE 180TH p� SINKING YARD 656E7
1984-0298 C F�LL 18504 112TFi AV�SE ILI.EGAL NEAR: 77409 1267'H AVE SE 686E1
19840304 C 17411 117TH AV�SE FILL 656F7
1984-0310 C FLDG �8019 118TH AV�SE BENSON WILL ARFA 656F7
1984-0315 C DRNG 18504 112TH AVE SE EASEMT BLIC�D/17409126TH AV�SE 656F7 li
1984-0316 C FILL iB504 1�2TH A1/E S� ILLEGAL� 17Q�09126th AVE S� 656F7 II
1984-0322 C FLDG 12602 SE 1767H ST 656F7 '�C--'
19840388 C FLDG 12602 PETROVITSKY RD 656F7 �
19$5-0235 E pRNG BsrSdy RQD-COMP BY Ctr�DT 656F7
'^"� "'235 EH WQ� BsnSdy RQaCQMP BY CmDT 656F7
1 '35 SE 7} 656F7
1985-0604 C FILI. 17232 118TH AVE SE DRNG OBSTRUCTION 656F7
1985-1021 C FILL 12234 SE 178TH 5T TO GRADING 656F7
1986,0254 C FLDG 12137 SE 172ND ST FLOODED LOT 656F7
1986-0907 C FLpG 17500 11TTH AVE gE STEAM THRU ARLA 656E7
1986-0907 ER PIPE 17504 117TH AVE SE TRFR 7o BALd-GRDG 656E7
1986-1047 C FLDG 17865 111TH AVE SE TO SMALL OF PIPE 656E7
1987-0409 C FLDG 17665 111TH AVE SE fNADEQUAT�DaNG/PLUGGED 86-1047 656E7
l987-0493 E DRNG 17661 109TH AVE SE DITCH OBSTRUCTION 656E?
'967�99 C NOT IN FI�E. 656F7
987-0723 C FLDG 17H35 122ND PL SE SILTING&POLLUTION-PETROVISKY CON 656F7
987-0817 C FI��. 12637 5E 176TH ST WE7LANDSIS�PETROVITSKY RD/126TH 656F7 �--
987-0817 ER WE7LAND 12637 SE 1T6TH 5T BALp LD ACT,SPT BALD GRDG. 656F7 �-
967-0895 C FIL� 18217 1187H AVE SE FOLLOW FROM GRADING 656F7
98T-0895 E FIHL TO RDS FOR COST EST.IOORE. 656F�
387-10Q5 C FLpG 13100 SE 182ND CT WANTED INFO ON BUILpING ON LOT 686G1
387-1123 C DRNG 17324 117TH AVE SE HOLE AT END OF DRNG PIPE 86-0129,111 656�7
)87-1183 G SILT 13400 SE PETROVITSKY RD SI�TATtON-9347N AVE SE/P�TROVITSKY 656G7
►87-1183 ER BOLLARD 13400 SE PETROVITSKY Rp BOLOCKING ENl'RANCE TO POND 656G7
Page 1 of 4
� �7a�
J u�.:�1.ZFI�i 10=54AM KC W_.RD NO.590 P.6/I 1 � I�
6�°t � l y p e tl Pr�lon A�s 1f�
6wro�1s �p�
Ne�er I�
�-1183 NDA 51LT. Vl.TR CRT PROB 68fiGi
-1194 X DRNG 18217 118TH AVE SE BLOCK�D COUNTY DRAINAG�87-0896 656F7
19BB-0319 C DRNG 17 I
827 116TH AVE SE DRNG DITCHlSLOPE/FRENCM DRAIN 656E7
1988-0382 C DRNG 12505 SE 172ND ST DRNG DITCH-COLOR OF WATEWSOOS C 656F7
1990-0271 C Di�NG 12420 SE PETROVtSKY RD DRAINAGE CONSTRUCTION/STORM EVE 656F7 � II
1990-0566 CL FLDG 12802 SE PETROVITSKY RD CL#12867 DUE MAY 656F7 •E-- �i
1890-0664 E MANHO�,E FAILUR� 656F7 �-- �
199p-0809 C DRNG 17709 1147H pL S� SOGGY YARD/IN CRAWLSPAC� 656E7
9994-1473 C PONDING 18203 140TN AVE SE NEW CONST OVERFLOWING SYSTEM 666G1
1990-1530 C FLDG 18427 1127H AVE SE 65B�7
1990-1531 C FI.DG 1842T 112TH AVE SE 856E7
1991-W31 C FLDG 18217 124TH AVE SE STORM EVENT/NO DITCH PONDING 656F7 �
1991-0099 CL FLDG 126Q2 SE P�TROVI7SKY MEMO TO PA 656F7 '�'�
1991-0698 C SARING 11504 SE 118TH P! FI�LING IN OF POND 656E7
1991-0652 C FLOODING 12615 S� PETROVISKY RD WATER FROM BANK 656F7 f-�
1991-0852 SR FLOODING 12615 SE PETROVISKY RD WATER FROM SANK 656F7 �-
1991-1023 C FLOOpING 11633 SE 180TH ST WA'f�R FFZOM R�ADWAY 656F7
1951-1067 C FLOODING 18216 1247H AVE SE LACK OF DRNGMEW HOUS�S 656F7 �� '
1992-0433 C WE7LAND SE pETROV�Da 13�tA SE 658G7 II
1992-0433 SR WETLAND SE PETROV RA&134A SE 656G7 �i
1992-0�471 C DRAINAGE SE PETROV.RD&134PL g� 656G7
1 571 C DRAINAGE 12301 SE 172ND DITCH CAPACITY-OLD PROBLEM 658F7
1�yc-u�71 SR DRAINAGE 12301 SE 172ND DITCH CAPACITY-OLd PF20BLEM NOT Nf� 65fiF7
1992-0609 C DRAINAG� 17225 125TN SE CASCADE VISTA STUpY fi56F7
9 993-0082 WQC WQD97413 11930 SE PETROVITSKY RD �,SB�
1993-0D62 WQ� WQD97413 11930 SE PETROVITSKY RD pUMPING FLYER-STORM DRAINS 656E7
1993-0181 C DRAINAGE 17033 116TH AVE SE SOGGY YARD 656E7
1993-0186 WQC WQ-OIL 12301 SE 172ND SEE 91-1106 656F7
1993-0338 WQC Otl DUMP 12000 SE Pk'TROVITSKY RD SWM AtDNT ENF ACTION 856F7
1993-0570 C DRAINAG� 17113 12TTH AVENUE SE WATER LIN�LEAKS 656F7
1993-0644 WQC DUMPING 11930 S� PETROVI`fSKY RD SEE 93-0062 656E7
1993-1059 E PIpE 12700 SE P�TROVITSKY CASCADE VISTA/BRODKA 656F7 '��
993-1059 ER PIP� 12700 SE PETROVI7SKY C1lSCADE VISTAI�RODKA 656F7 �-
994-0126 C �RNG 12�20 P�TROVISKY RD NEIGH80R CONSTRUCTING PONp 656F7 �-
994-0144 C DRIVG 1�925 116TH AV� SE POSS FIl.LING VIOVACT PLAT MORNING 686E1
994-0381 CL DRNG 13100 SE PE7ROVITSKY RD 33 AG TRACT RAMAGED�Y KGAPPRVD 856G7
994-0450 WQC ILUHKUP 12517 SE P�TROVITSKY RD SEPTIC PROBL�M 656F7 •'��
�i-Q516 C SPRINGS 171XX 134TH AVE SE �R0510N NEXT TO WD POND 65fiG7
�94-0739 LS 134TH AVE SE&PETROVI7SKY RD COMPl.A1NT WITHdRAWN BY PLAINTIFF 656G7
�94-0781 C DIVERT�D SE 183RD ST&124TH AVE ALLEGED FfLL AC7MTY NOT IpEN71FIED 666G1 �4—
Page 2 of 4
� 7�0�/
JUL.31.z001 10=55f�1 KC bLRD N0.5� P.7/11 i
� T� 1��f Probilln A�oi�r06ND � �.p= '
N�" Co� �
5-0200 C DITCH?S 18204 116'TH AVE SE LACK OF CONVEYAYNCE ON PVT PROPE 886E1
s-0492 C POIVDDRN 11501 SE 173RD ST MAINTENANGE OF PRIVATE R/D FACILITY 656�7
7995-0492 NDA PONDDRN 11501 S� 173RD ST MAINTENANCE OF PRIVATE R/D FACI�ITY 65BE�
1995-0492 RN PONDDRN 11501 SE 1T3RD 5T MAINTENANCE OF PRNATE R/D FACILIN 656E7
1995-0535 WQR MAINP. 17a21 120TH LN SE 656E7
1995-0849 C FLO�DING 12602 SE PETROVISKY Rp BRODKA/WORELY DISPU7E 656F7 �—
1995-0751 C DRAINAGE 134TH 5E $PETROVISKY SUBSURFACE FLOW CAUSING SATURAT 656G7
199�0782 C RUN�FF 13�411 SE i83RD 5T tRON-0XIDE STAIN WAT�R OV�R SIDEW 686G1
199�0790 E DRA�NAGE 12632 SE PE7ROVISKY RD OP�N IAWSUIT B�TWEEN WORLEY AND 656F7 -t� ,
1995-0790 ER DRAINAG� 12632 5E PETROVISKY RD OPEN LAWSUI7 BETWEEN WORL�1(AND 656F7 �—' ,
1996-0591 C CREEK 17405 116TH AVE SE PLUGG�D CULV�RT 656E7 '
1998-0679 C FLDG 12031 SE 170TH PL IMPACT TO PVT PROPERTY FROM UNMAI 656F7
1996-0757 C GRAQING 17728 114TN PL SE SHEET FLOW FRpM ADJACENT LOT 656E7
1998-0936 WQR OiL-POND 17200 11fiTH AVE SE SEND LETTER W/MCL ATTACHED 656E7
199&1'f 35 C W-0-R 17321 125T1-1 AVE SE WATER PONDING AT�ND OF SAC NO RD 656FT f--�
1996-1169 WQC OIL 12'105 SE 170TH PL URBAN DRAINAGE DISCHARGE INTO CHA 656F7
1998-1236 C FLDG 17023 113TH AVE SE APPARENT IMpACT TO PVT PROP OPEN 656�7
199E-1236 RR FLDG 17023 913TH AVE g� APPARENT IMPACT TO PVT PROP OPEN 65&E7 �';
1996-1711 FCR POND 17142 136TH PL gE SEpIMENT BUILDUP MOLASSES CREEK 656G7 �
I
1996-2042 C FLDG 16134 1297H AVE SE GROUND WA7ER IMPACT PVT PROP 656G7 �
19J6-2050 C FLDG 12601 S�- PETROVITSKY RD NAT CHAL.SEDIMENT IMPACT CIP PROJ? 656F7 '�--
� �7� C FLDG ��s28 sE �aarH s7 tNnoEQUAr�CONVEYANc�oFFsrr�F� sss�i
1��v-ca71 R F�DG 11828 SE 180TH S7 INADEQUATE CONVEYANCE OFFSITE FL 686E1
1996-2125 C DRNG 17311 117TH AVE SE TREES IN CHANW�L,DOWN FROM GAtNS 656E7
1997-0588 C pRAtNAGE 17310 119TH LN l.5 SE PVT PROB SITUA710N REMEpiED B�TVIIE 656E7
1897-0692 C DRAINAG� 17�03 125TH AVE gE COTfONWOOD TREE ADJ TO STORM PIP 656F7
1997-1316 WQR SPILI. 12700 SE 172ND ST g�F7
1997-1324 C DRAINAG� 17005 1307H AVE SE GRND 1NTR IMF'ACT SUMP PUMP pISCH T 656G7
1997-1477 WQA DUMPING 116XX PETROVITSKY RD DFtAINtNG OF SWIMMING POOI;H�ALTH fi56E7
1998-0052 C DRAiNAG� 17'120 125TH AVE g� WATER PONDING ON PROP TECH ASST 656F7
1998-0349 C DRAINAGE 13420 SE 182ND ST PI.UGGED ROOF DRRINS MAIN7 R�OU 686G1
1998-0421 FCR DESRIS 17811 1147H PL SE GNFZBAGE DUMPED(N R/D TRACT 656E7
998-0488 C DRAINAGE 17321 125TH AVE g� WATER PONpiNG WITHIN RD R/W 656F7 �'
99&Q543 C DRAINAG� 17232 116TH AVE SE UNCONTROLLED FLOW FROM pARKING L 658E7
89&0886 C D�tAINAGE 12808 SE 170TH ST LOT DRAINAG�CONN�CT 7o RD DRNG S 656G7
998-0921 C DRAINAG� 18532 131ST AVE SE MtNOR PONDING LQCAL�OW AREA 686G1
998-0329 FCR BAMBOO 12317 SE 178TN PL NON NATI1/E GROWTH IN RID�ACIl�ITY 666F1
999-0363 WQC MUD/SILT 112TH SE 17fiTH ST CONST ACTIVlTY CAUSE MUD/DIRT ON R 656E7
a99-03&} C DRAINAGE 17832 114TH pL SE FLOW FROM ADJ PROP ONTO COMF'L 656E7
a99-0�66 C FILL 12420 PETROVITSKY RD FlLL ACTIVITY ON ApJ PROE'IMP FLOW D 656F7 �"'�
Page 3 of 4
� 7/�/
JUL.31.2�01 10=55f�"1 KC l-�RD N0.590 P.8/11 �i
� � 1�L 9f PI'0�! A��� p�
TEiroa�e �
� Cpb
'9-Q608 C FLOODING 17307 11'7TH AVE - g� ROAD RUNOFF CAU5ING FLOODING 656E7 I'i
l-0657 C FLOODING 17314 11BTH AVE SE ROADS CAU5ING F�oOD1NG SEE99-0608 656E7 !
20Q0-0165 WQC DUMPING 18316 129'TH PL SE APPARENT DISCHARGE OF PAIIVT INTO S 686G1 li
2000-0165 WQR QUMPING 1851B 129TN PL � APPARENT DISCHARGE OF PAINT IfYTO S 606G1 II
2000-0363 C DRAINAG� 17300 116TH AV� SE SEDtAAENT tMpACY TO DRAtNAGE CHANN 656E7
2000-0363 R DRAtNAGE T7300 116'TH AVE SE SEDIMENT iMPACT TO DRAlNAG�CHANN 65BE7 ��
2000-0418 WQC WQD 17040 129TH AVE S� VEHtCLES PARKED ON STREET, EVIDEN 656G? �
2000-0418 WQR WQD '17040 129TH AVE 5E VEHICLES PARKED ON STFtEET. EVIDEN 656G7 I��
2000-0576 WQC WQB 12813 SE 184TH PL ALt,�GED POLLUTANT DlSCHARG�TO ST 686G1
2001-0014 C DDM 12207 5E 172ND ST REQUEST FOR CLEANING OF DRAINGE C B56F7
2001-0014 R DpM ' 1?207 SE 172Nd S I',
T REQUEST FOR CLEANtNG OF DRAINGE C 656F7
2001-0�09 C DDM 125�a SE PETROVISKY APpARENT FILLitv�AND oRA1NAG�ACTi 65sF7 �--- ',
2001-0111 C DDM 12308 S� PETROVfSKY RD DUMPING OF YARD WASTE AND CHANNE B56F7 �i
2001-0190 FCR MMA 1147H P SE &PE7ROVITSKY RD CONCERN REGARDING POND S(TE CAND 656E7 I
i
2001-D247 FCR MMA 12317 SE 178Tli PL IDENTIFIED NOXtOUS WEEpS. BLACKBE 666F1 'I
2001-0322 WQC WQO 11631 5� 184TH ST APPARENT GREY WA7ER pISCF[ARGE IN 686E1
2001-0322 Waa WQO 11631 SE 184TH 5T APPARENT GREY WATER DISCHARGE IN 686E1
2�1-0336 C DDM 17022 128THAVE gE DRAINAG�fMPACTTO PVT PROPERTY. 656G7
2001-D382 C DDM 16294-1 125TH PL SE ROADS INDICAT'�D PIPE SEPARATlON OF 656F7
2001�0389 Wac wor SE 18oT &118TH AVE g� POTENTIAL GRAY WAT�R DISCHARGE. B86E1
2001-0389 WC1R WQI SE 180T &118TH AVE SE POTENTIAL GRAY WATER DfSCHARGE. 686E1
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� SURFACE WATER MANAGEMENT DIVISiON
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�LAINT RECEIVED BY:
T^"� OF tNVESTIGATION: Sketch on reverse side:Yes�' No D Photos:Yes C� No C� I
.te 1-30-91 . � ���y
The Lattanzio property is relatively level , rrith a slope from rrest to east, towards the road
South of the Lattanzio lot the roadside ditch slopes to the north, The Lattanzio property
and the neighbor to the north do not have a ditch. To the north of the neighbor tne ditch
resumes. Run off is said to pond around Lattanzio`s mailbox (photo 2) and eventualiy flor�
across the road to the neighbors on the east. The road is county maintained and is a
shoulder type road.
Photo 1} Looks north on 124th. Lattanzio's property starts close to the pole at left.
2) Sam Lattanzia's house is in foreground.
3) Looks south on 124th with Lattanzio's property cleared at right.
4) Oposite side of road where run off is said to flow. Pile of leaves at mail box is
said to have originated at Lattanzio's.
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SEC Z8 TWP�RGE_ �
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dress � �� City State Zip WORKa7�' Z
fAILS OF COMPLAINT: _ ��� ��y��,����� �,
vIPLA(NT RECEIVED BY: '
A = INVESTIGATION: Sketch on reverse side:Yes Q'No O Photos:Yes Q� 3 No❑
apm�ty
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The problem is seepage/drainage from a bank below road grade and off road right of way. It
is said to have occured for the first time approx 2 months ago. At the time of observation
water was flowing from the base of a bank south of Petrovitsky Rd on Mr Fugate's property.
Storm drains on the south side of Petrovitsky and in the vicinity of this problem were dry.
To the east is a 36" concrete culvert under Petrovitsky that was half filled with water
and drains to the south, which appears to be wetlands. Mr Fugate indicated the majority of
this area is on top of a peat bog. North, and across the street, from the problem area is
a low area with stagnant water ponding.
Water district is said to have told Mr Fugate that there was no fluoride in the water that
was seeping from the bank, and therefore not a water main problem.
Photo 1} Looks west on Petrovitsky. Drainage/seepage problem is where vehicle is leaving
road on left.
2) Looks south from Petrovitsky at ponding area on lot 7.
3) Base of bank where seepage is flowing from bank.
1PLAINT INVESTIGATED BY: > �C��.v�r�s+���•^�— DATE: d -Z-�
ON TAKEN: �_13-9 1 . 1.�-� 'f lG�TtZ�2 ui i � Orr4��...f � �ro f �'�/+�l� S�. �o+�.L �� A c%��1� /ke�
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ipiainant advised of action possibfe or taken by: Phone Q' Letter ❑ Personal Contact C �
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�plaint Action Handled By �'y' P�� -�->,.�e�-- Closed: U� 7 OK`d:
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King County Department of Public Works
Surface Water Management Facilities Maintenance Section "
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Ki�C CDUN�( DEP,4�7M�NT OF��3LiC Vil4RKS -t�. �
SURFA�,E 4VATER MANAGEMCNT DIV{StON j
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C4MPL.AlNT fNVESTlGATION REPOR� ' i� } '
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AGATION:• Z3F��.��L lt�-� L d�a„� ��£'z.� ��C'.�- KROLL PG. GD'�� �
:OMPLAINAt�T; tti1E�E W�6'SOt� COUNCIL DIST. ��
- FNONE NO.
��2-�6 1�4,Tt� �Vt�Z's� - HOME 2Z�- 1SO�l
►ddsess �Z City �-'�5�� State �� Zip�. WORK
EFAIl.S OF COMPLAINTi ' - --- . �
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OM�LAINT RECEIVED BY: � - �j 3 Z:�jD,r• 90�n`� -Q f
UF lNVESTfGAT10N: : Sketch on reverse side:Yes No hotos:Yes No C - j
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On site 10-21-91. -- - - - - i
This complaint is the same as 91-0031/Lattanzio. Run off from praperty to the west ponds i
across the street from the Watsons and then eventually flows across the road where their ;
R/W is asphalted and then to the north to 182nd St. There are no defined ditches on 124th at I
this 7ocation. ` �
Photo I} Looks north on 124th. Wa�son residence is at right. i
2) Looks south on 124th witti Watson residence on left. Note puddle on right. �
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OtviPLAI►�lT IM�ESTIGATED BY: � _ �Z I� II
�TtON TAKEN: l o `zi-9l. S��.� �.v�� `Nvf' �7.�d1�. v�lt c S'�s �✓.+��-.- �d� ,�o�.aP �re���I -
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�omptainant advised of action possibie or taken by: Phone � Letter D Personaf Contact D j,�f-/�/��
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KING COUN— " iURFACE WATER MANAGEME�'— -►IVISION
DR.AIN_ _ �E INVESTIGATION �Wi ORT
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Rece'rved by: Date: /� �� OK'd by: F'�le No.
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f )d from: (Ptsase print plainly for scanninp)_ (paY) (Ev°)
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NAME: �,'�{,��__ ��y/V � _ PNONE_ Z��6--��Z�
ADDRESS: CiTy State Zip
Location of problem, if different: ���?`� �/<,j,�r' 1 ��,U��J /�T� �.�7`�
Deiails of Problem: }/1G I�7 �� �(`11/f ft ''�' '
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Other agencies involved: (Give details)
�eponed Impacts: # Properties: Dates/frequency of occurrences:
Home
Access road ' ` ' '
Septic system
_ outbuildings, garage
_ Yard/landscaping
_ Other property
Stream, lake, wetland
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>cafion/Tiacking lnfo: S�%�1/4 S�TZ 3 R ,'7 Parcel Na ��73Q()v -Q�yS TYPe,_��
3asin.SOc7 Council Dist� DIR Ref/Chg No: ���D it ���u'Field investigation needed?
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� KtNG COUNTY SURFACE WATER MANAGEMENT DIVISION "
- DR.AINAGE INVES`�'�TION REPORT �
Page 1: INVESTIGATION REQUEST Type �
I �ed by. �S�� Date: ZlZ Z�q f� OK'd by. Fite No. C1L��D fZg
ReCeived fi'Om: (Please print plainly for scanning). (Day) (Eve)
NAME: /-�/I/O�/y/!ilU� G`�u�,fE C!i/`G/S PHONE Z Z6-ZS7S
ADDRESS: lZ 't7� �E�'�o%s,��/ �C/� City State Zip
Location of problem, if different: PRoP��T�' if/o.tT!! OF N�'P T�X �o� p �,3yoo -00,36
Reported Prob/em: �
��i G N�o�c To THE �t/o�CtN ff'� � �y,���D ,�,(�/y/+i-GC. L�Nt� !/SE�
� Tc� I�O�v D /��iCor� ( GOo T ��t/ �✓ivTE�f ��/T- o w�v��[ /S tiou�
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r'iat name: B�ySO� �E�6f�TS Lot No_ 7 Block No: ' !
Othe�agencies involved: No Field Investigation Needed
(Ir�ltlals>
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�� �� �2$ ,� s Parcel No.073�D0 � 3 � Krdi O'2[ Th.Bros: New 6S� 1C 7 I
t/4 S T R _ Old �f2 g1.� ,
Basin,s(� Councd Dist� Charge No:
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RESPONSE: Citizen notified on 3-g- q� by -�phone letter in person Y 3 �y,✓a �
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DISPOS/TION: Turned to on by OR: No further actian recommended becau�
�✓Lead agency has been notified: �D�S �t�c�.��,-„`Q � �� �,�
_ Problem has been corrected. _ No problem has- een identified. Prior irnestigation addresses probler
See Fle�
Private problem - NDAP will noi address because:
Water originates onsite and/or on neighboring parcel _Water originates on KC Road
Location is outside SWM Service Area. Other (Specify):
DATE CLOSED: � / � /� by: �
KING COUNTY SURFACE WATER MANAGEMENT DIVISION
DRAINAGE INVESTIGATION REPORT
Page 2: FIELD INVESTIGATION
Deta�7s of lnvestigation: The area of concern i s a rel ati vel y 1 ow and wet area. Property owner
appears _to have placed new grave.l on his access road.r-cut up a -large fir tree, and opened
a new access road to the rear of the property. There is a large pond on the front of the
property, but did not observe a culvert or water conveyance system for the pond. An access
road was extended to the rear of the property, and there was ponded water in low spots, but
no drainage channels or ditches observed.
Photo 1) Looks north along access road from Petrovitsky.
2) Shows pond, house, and tree sections.
3) Looks westerly across front of praperty and pond.
4) Looks north along extended access road.
5) Looks towards Petrovitsky from new roadway.
It appeared that the property owner was attempting to "clean up" the property; remove brush,
rim the pond with rocks, etc. No hazard to County property.
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KtNG COUNTY SURFACE WATEf��.��14AL9eGEMENT DIVISION ,
DRAINAGE INVESTIGATION REP RT �
Page t: INVESTIGATION REOUEST Type
R �d by: C�. �,� Date: � /� OK'd by. FNe No. 94-0450 '
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Received from:�"�j zA�y� (�.�1 V�,��'��ease print plainly for scanning). (DaY) (Eve) I
NAME: ��t t'_
�I I��t��� t70G PHONE Z 3S;�Q� _ _
ADDRESS: City State Zip ��
Location of problem, if d'rfierent: �Z�j I^I �F P��V��� � I
Reported Prob/em: � �
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iat name: BENSoN /�EiGNTS ��� Lot No: cS Block No:z
�ther agencies involved: No Field Investigation Needed
onnlals�
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SE 2$ 23 S Parcet No.p73900 O!1� Kroll �Oz �' Th.Bros: New b 56 f 7
t/4 S T R Old S/2 8�/
Basin S�Q Council Dist q Charge No:
SPONSE: Citizen not�ed on '`a � �by�_� on _ letter _ in person
,tJ�l'�tl1G` �r z.�t q�.
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>POSlT/OIV: Turned to on by OR: No further action recommended because:
Lead agency has been notified: �
_ Problem has been corrected. _ No problem has been identified. Prior investigation addresses problem:
See Fle�
_ �problem - NDAP will noi address because:
Water originates onsite and/or on neighboring parcel Water originates on KC Road
_ Location is outside SWM Service _ Other (Specify):
�TE CLOSED: U ����by. �d ��r���
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KING COUNTY SURFACE WATER MANAGEMENT DlVtSION
DRAINAGE II�VESTIGATION REPORT
Page 2: FtELD INVESTIGATION
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KING COUNTY SURFACE WATER MANAGEMENT DIVlSION
DR.AINAGE IN�ESTIGATION REPORT ''
Page 1: tNVESTIGATION REQUEST Type �
�, by: ��• Date: �p/�,� �9 OK'd by. �' File No.94—O7H 1
4eceived from: �i/a� Ho��l' 'c7�/70 �ease print plainly for scannln9)• ��Y) �E'e)
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it name: Lot No: Block No:
her agencies involved: No Field {nvestigation Needed
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1/4 S T R �lC� y 2 Cy �B4�
Basin soo Council Dist q Charge No:
iPONSE: Citizen not'rfied on by _ phone_ letter _ in person �
(� /�'����c. �2-z'S-4y C �oSi -�':l� t-13-`�S. /�Ar �"�,� 1nc-'}�^ � ,..e-lvvr.� c.�.\�.
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'POSITlON: Turned to on by OR: No further action recommended because:
Lead agency has been notified:
_ Problem has been corrected. �No problem has been identffied. Prior investigation addresses problem:
See Fle#
�h�em - NDAP will not address because:
Water originates onsite and/or on neighboring parcel _Water originates on KC Raad
Location is outside SWM Service Area. _ Other (Specify):
-�.L-/_1-_L/,/� bY� -�
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KING COUNTY SURFACE WATER MANAGEMENT DtViSION
DRAINAGE II�VESTIGATION REPORT
Page 2: FIELD tNVESTIGATION
tai/s of/nvestigafion:
Complaint#94-0781 Anderson
inves[igated by Doug Dobkins
investigated on 11-2-94, 12-21-94
I've talked to Mr. Anderson in early part of November about this alleged diversion of water along the
Big Soos creek_ I investigated on 11-2-94 this complaint but I was in the wrong area after talking to Mr.
Anderson. There was an ol@ red tag from DDES from 7-28-93 for a grading violation. This wasn't the
area Mr. Anderson was talking about The area of his concem was to the south of here. I tried to contact
Mr.Anderson 11-15,11-7,11-22,and left a message for him on the 23 of november to give me a call so I
could get better information on this diversion I recieved a call 12-2-94 from Mr.Anderson_ He told me
the area was east of the intersection of SE 184th and 124th ave se. I walked this area and couldn't find
any recent grading or dumping. Mr.Anderson claims this happened 3 to 5 years ago. The area of
concerned is a wedand that is overgrown and clogged with debris. Couldn't find a diversion of water
anywhere near where Mr. Anderson is claiming this happened.
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� KING COUNTY SURFACE WATER MANAGEMENT DIVI N
� � DRAINAGE INVESTIGATION REP E P
j I Page 1: INVESTIGATlON REQUEST y e
I
�,� b ' Date:. OK'd b File No_ C�5 - 0�!.�
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Loc2tion of problem, i� different: �2 (p 6 2 S'� �,�-f?�l�I S �m � �� '��/�
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Basin �D(� Council Dist (p Charge No:
.- c. --- -- . — -
R�SPONS�. Citizen notified on �y phone le�er in person
D/SPOSlT/ON: Turned to on by OR: No iurther action recommended �ec
Lead �gency has been notrfied:
_ Froblem h2s been corrected. _ No problem h2s been ioentiiied. Prior investigation aodresses prot
�e F�ie �
_Priv2te problem - NDAP will not consider because:
�ti'ater originates onsite and/or on neighboring parcel
_ Location is outside SWM Service Area. Other (Specifi��):
DAT� CLOSED: � � by:
�
��. _ - ---
KING COUNIY SURr=ACE V�rATER tJIANAG�t�IENT DIVISION �
DRAII�TAGE INVESTIGATION REPORT
i
Page 1: INVESTIG�TION REQU�ST Type �' v
I iE i by: �.5�� Qate:. . f�/��`!S— OK'd by: File P:o. �5"D/ !O
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Reporied P�ob/em:
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.�ti•.�te proble.;� - �J,%- writ noC consicer b�c2use:
1'`�Glp� O:igin2tes onsit� a�dror on neic^bo,in� parcel
�ocation is oirside v:�4��,�, Service Area_ O:hzr �Speci��j.
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NEIGHBORHOOD*DRAINAGE ASSISTANCE PROGRAM
COMPLAINT EVALUATION MEMO
DATE: 11-17-95 REVISED 12-20-95
TO: FILE
FROM: Alan Meyers
RE: NDAP EVALUATION FOR COMPLAINT NO. 95-0790 WORLEY PROPERTY
12632 SE PETROVITSKY RD, RENTON
COMPLAINT CHRONOLOGY:
ORIGINAL 9-18-95
FIELD EVAL. 10-27-95 BY ALAN MEYERS
OLD FILES: NONE
BACROROUND:
According to Mr. And Mrs. Worley, they have lived on a 2.4 acre lot in
SW Renton for over 30 years. Their lot abute on the north edge of
Petrovitsky Road running 500 feet north and south and 150 feet eaet and
west. Except for the southern edge of their lot which drains north off
of the Road, their lot generally slopes NE to SW with surface drainage
and several springs along the NE and E edge of their lot historically
draining to the west acrosa their yard, through a 0.1 +�- acre backyard
pond and draining off to the west property through a 12 inch drain pipe.
According to the Worley's, Mr. Brodka, who owned the south half of a lot
two lots to the west of Worley's lot, purchased the 2.5 acre lot just
west of Worley's lot about 1985 and the back (north) half of his
original lot about 1988. Mr. Brodka has reportedly done considerable
grading and filling of both lots and constructed a pond in the lot next
i to Worley's. Beginning in 1987, the Worley's drain pipes draining to
the west began backing up reportedly due to the filling and grading that
Brodka was doing on his lot. Worley's have a staff gage in their
backyard pond and have kept daily water level readings and many photos
of their flooding pond condition during wet periods for many years.
Their data reported2y confirm that flooding and backups began about 1987
I when Mr. Brodka reportedly began to fill in and develop the lot just
west of Worley's property. According to the Worleys, there is currently
I a laweuit in progress between these neighbors.
FINDINGS:
A aite vieit with the Worleys plue an analysis of a topographic
hydrologic map confirmed the Worley's etory that the long term
established drainage pattern was NE to SW across these aeveral lots.
Since the Worley's drainage problem is apparently caused by a downstream
DRAINAGE (HAZARD) code violation, it is not eligible for the NDAP and is
therefore being investigated as an Engineering Review.
SOILS:
According to the KC soils map, the eite is located in the
following soil asaociation:
ALDERWOOD ASSOCIATION: Moderately well drained undulating to
hilly soils that have dense, very slowly permeable glacial
Itill at a depth of 20 to 40 inchea; on uplands and terraces.
�
II
1
�
According to the Worley's, their drainfield which ie located juat SW of � ��
their garage, is partially underwater during wet weather due to a
plugged 4 inch drain pipe at their west property line about 50 feet : '�
north of their SW property corner. This pipe drains water from their CB � �-
located in the SE corner of their parking area in their front yard.
Part of the surface runoff is runoff down a slope and through a rockery ± '
off of the Petrovitaky Road right of way. I called Wayne Olsen at the �
KC Health Department (296-4932) and asked about this impact. He said
that Worley's area is new to him and he does not have any knowledge of `
their problem. He said that if an enforcement is needed because of a �
aurface water drainage problem, that he wou2d request RCSWM to do the �
enforcement action. ti-
►
According to Brian Sleight and Pricha Tuksaudom of SWM, severe street !
flooding occurred just north of the Brodka Property in 1990. Portions !�
of SE 172nd Street, 125th PL SE and 127th Avenue SE flooded for several �
days. From preliminary field etudies by Pricha and myself, it appears
that atockpiled landacaping supplies stored at the north end of Brodka's �
lot in the past have covered a drainage pipe outlet which drains the �
street drainage system off of SE 127th Street to the north. In
November, 1995, Pricha told me that as part of the solution to this
street flooding problem, he will probably request Mr. Brodka to lower ! '
his western pond outlet overflow elevation by about 6 inches sometime in �
1996. �
On 11-21-96 I visited the Brodka's property. No one was home so I left '
a door hanger tag and my business card. Z walked over�to the Worley's �•-f i
yard and placed two long pieces of pipe aqainst Brodka s 8 foot high
wood fence at the locations where Worley's pond 12 inch drain pipes were ` i
located. I walked back over to Brodka's property and took aeveral ;�� '
picturea showing the relative location of his drainage pipes in Brodka's ; �
yard. When I hear from Mr. Brodka, I will get his side of the story and
add it to this report. !
s
Mr. Brodka returned from vacation and we met at his property on I2-11-
95. Mr. Brodka was very cooperative and gave me answers to many j
questions about the history of his property and Mr. Worley's drainage I
pipes which enter his property at three locations along his east ': �
property line. According to Mr. Brodka, from about 1986 to 1988 both ��• i
I!C
the installation of a deep trunk sewer line through the center of his j
property north to south by the local Sewer District and the widening of ; �
Petrovitaky Road by Ring County, disrupted his property in varioua ways. �,
Deep cuts for utilities, the filling of drainage ditches by Ring County, '
regrading and building his wetland pond on his east lot. Mr. Brodka �
stated that he cooperated by allowing the extention of Mr. Worley's
three drainage pipes over into his (eastaide) wetland pond and he has
never placed any valves or other blockages in Mr. Worley's three pipes. �
2
x�.-.. .
According to Mr. Brodka, his pond is overgrown with various water plante
which can't be harvested due to wetland regulations. In the eummer,
muskrats are common in and around the pond area. The pond outlet is a
vertical 6 inch diameter PVC pipe with a screen around it to minimize
vegetation blocking the outlet. He stated that the pond level does not
vary by more than 1/2 inch even during and following heavy rainfall
periods. He showed me the pond outlet and explained where and how the
pond outlet is piped over to the north ROW line on Petrovitaky Road and
west to where it ties into the 36 inch road cross culvert near the SW
corner of Brodka's property. I ahared thie information with Pricha
Tuksaudom and Amy Carlson at RCSWM for use in their study.
;
Mr. Brodka gave me permiasion to aurvey whatever I needed on hie
Iproperty. Using my hand level, I checked levels between Brodka's and
Worley's ponds by placing a piece of flagging in the fence at a point 6
feet above the water level on one side of the fence and checking the
same on the other side of the fence after walking around to the other
side. The water Ievel in each pond was the same based on this rough
survey procedure.
I discussed the maintenance of these pipes with Mr. Wor2ey. He has an
electric powered sewer snake 75 or 100 feet long which he has used to
maintain these pipes. He eays that he haa evidence that Mr. Brodka
plugged the 4 inch drain pipe that drains his parking area on the south
side of his house. Mr. Worley says his attorney has pictures to prove
that Mr. Brodka raises hie east pond level from time to time which in
turn raises Worley's pond level.
OPTIONS AND DISCITSSION
Based on information and discuseione with Mr. Worley, it appears that
Mr. Brodka has completed a Rinq County drainage code violation and
produced a Flood Hazard by raiaing the water level from time to time in
his wetland pond located near hie east property line. However, Z have
not actually seen Mr. Brodka's pond level in an elevated condition.
Since there is a pendinq law suit between these parties, I have stopped
work on this Complaint File.
TOTAL ENFORCEMENT RATING = 7
3
_ _____. ��..... . . .,..�,� .-,�,� vvfai Crt mANAcaEMENT DfVlSION �i
DR.AINAGE INVESTIGATION REPOR'X' '
Page 1: INVESTIGATION�REQUEST Type � �
Received by: Date: ���� ��� OK'd by. File No. �/__j J 35 '
(D
"9Ceived frOm: (Pfease print plainly iot scanning). (Day) (Eve} I
��,,,,�E: JJ�V�� ���� PHONE
ADDRESS: ��� �2 f 12�� �V� S� City 1``e��'v State W� Zip
Location of problem, if different: I
Repo�fed P�obJem: �
�, I�tJG� 1r1 /�D�.G� (� •
G�
— G;��GC..�.�2-L� �'�'����-- � �
. ���
me: � 1 _ /� �� � J � Lot No: � Z Block No:
� �d�- ��� 6�8—�,
��/,y��
Other agencies involved: No Field Investigation Needed
pr�t�e�s)
,�} ��� ***���x��x���*,�*�*.,r-.C3��CO�,�F�:E�"Et7:�Y�JI�i�LAII��'�F:OG�AM::57A���,���.�**+���*� * x,� *,�*t���x�
.... . .........................:..:-----.. ............._ . .. ..,..... ....,...::..�.: .-.. , . . ... . . ............_...._...,.......:._:...... .. .._..........---...
-��..... ...... . ..�-��----...--- .... .....:. ..................
.
�� z8 2� 5 Parcel No. ��CO�� �l 2� Krofl �d�� Th.Bros: New�( �"J�P� 1
i/4 S T R 01d
LIZ��'
Basin�D� Council Dist � Charge No:
'c"SPONSE: Citizen notified on by phone letter in person
' `
'SPOS/T/ON: Turned to on by OR: No further action recommended beczuse:
/�, ead agency h�s been notified: ���S ���(�`T//L�l- � t1 --��
_ Problem h2s been corrected. _ No probfem hzs been identified. Prior investigation addresses prob(em:
See Fle � -
_Private problem - NDAP wi!!not conside�because:
Water originates onsite and/or on neighbo�ing parcel
Location is outside SWM Service r Other (Speci"ry}:
— �� _
ATE CLOSED; � f � � � by. r
%ci����
� I ,,, . - � � � �� , �, ,
1,2iOd� .I�IOI.L�JI.I.S�.t�.t�II �J�I.t�II�Q
NOISI/�I4 1N�W�JdNb'W �f�lb'M ��b�-��JC1S J�LNflO� JNI>I
-- - --- -
,,,:.� _,
� -
D � �
i �������� _,
���
, . .
13 May 1996 M�� � � 1996
5URf1►CGE WATER MANRGE�nt�iur RN►�;�rv
OFEICE SUPPURI'S,�y�C��
King County Department of Natural Resources
Surface Water Management Division
700 Fifth Avenue, Suite 2200
Seattle, WA 98104
Re: Cascade �sta Drainage
I own a home at 17321 125 Ave SE, Renton, WA. I have asked the public works
people several times over the past 12 years to eliminate the standing water in the
street in front of my home. They have come out and investigated and investigated
and once even drilled some holes in the pavement. Their efforts have not worked.
There is no effective drainage present. �
Please, whatever plan is adopted, make sure that it takes care of this problem. It I
could be solved by adding additional paving to the street or better yet a storm drain.
The standing water smells bad and has mosquitoes around it at certain times in the
year.
Pfease keep me informed as to what your final plans are.
Thanks,
� ��
David R. es
13015 SE 31 Way
Kent, WA 98031
ti�ii-rw� — - --
.__,;. ...
---------
King County FIL.E NO. 9s-1135
Surtace Water
��
Management NAME DAVID JONES
a.�� �. d�.�.� ADDRESS 17321 - 125TH AVE SE
PNONE TB PAGE 656-F7
DRAINAGE INVESTIGATION REPORT KROLL PAGE so2w DATE 6-07-96
FIELD INVESTIGATION MAINT. DIVISION 4
INTITAL.S- MAM
DETAILS OF INVESTIGATION:
SITE VISIT ON 6-CS-�a. STANDING WATER ON ROAD. �
INVESTIGATION FOUND ON 126TH AYE SE DRAINAGE FLOWS NORTH EXCEPT AT THE SOUTHERN END OF THE ROAD.
THE CUt-DE-SACK APPEARS TO DRAIN SOUTH. SIGNS OF SEDIMENT BUILD-UP INDICATE PONDING. NO SIGNS OF A
CATCH BASIN OF DRAINAGE AT THE END OF THE STREET. 125TH AVE SE DOES MAVE CATCH BASINS AT CORNER OF
SE 173RD PL WHICH FLOW TO THE NORTH.
PHOTOS TAKEN � 1 LOOKING SOUTH ON 125TH AVE SE TOWARD CUL-DE-SACK.
� 2 SHOWING AREA IN CUL-DE-SACK WHERE POND HAS OCCURRED.
� 3 LOOKING AT CUL-DE-SACK FROM THE SOUTHEAST CORNER.
SKETC�I:
- - - � CATCH BASi
SE 173RD ST
FIOW
�I - � CATCH BASIN
' 1
( W
� N
I j
I a
2
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-_-_ � . . � �:
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I NOUSE
17321
�
� _
�,..�- " �--�--.. i
KING COUMY SURFACE WATER MANAGEMENT DNtSION
DR.AINAGE INV�STIGATION REPORT '
Page 1: INVESTtGATlON"REQUEST Type� ,
n � �
F �d by. � Date: f� �� � j OK'd by. Fde No. �- �_�, �j� ,
_ � I
� RBC6ived fTOm: �� (Please print plainFy for scannin9)• - (QaY) (Eve} �
NAME `/l,� � / ` ..� ' . � PHONE of�lc- '���7 0 � �
ADDRESS: ���D�� �.C=, ` ' CitY `��%���,�'� State Zip �����j
� j ,
Locatton of problem, ff diffierent: .
�
Re orted Problem. /� _/ ' �'�
p C�C�/��/�''���1��� -�� <;I.-/}'y'c�� � ����I� �--�� �'��'- �
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�';:!;,✓, ;c/iY�H�'T� lT5 �..�ria�r�z f"o Ti>c' �.r�i•� �:,•i,'- W�c� . ..._ .—
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( �Lr - � J� II
'lat name: F 1e���jC,i� ����yl�s �C�C�f Lot No: � � Block No: � Z
?iher agencies involved: No Fleld irnesttgatfon Needed
yy� �y �y v,...
• (lnttla�s)
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iiki«�"wA".���ELtwt.:Jr.f�.iFw..w':i�Ji4"+lmri.v.r.:w.wMw.w.Wnvwr.wwwrw�vnvww�wwwnb.wwww�nfvir.W:4iww4.4/.'".r'..:.L..'v'..:::iv".v'.win.'lAOF'w:wviF'Jh:iJw.J4w''w4'i4'i.:4iv.:"v.wF.fLw"4rn'�'Wii.w.vwiv fi:2'wwJFiti6L1f4+GiNiG✓Jifw:fiST'i•..Sw.•.....viiJ�
�� } r�.
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1/4 S T R , ' Oid ��
���`� , � � �� '
Basin_��-� _� Counc� Dist� Charge Na !
�SPONSE: Citizen not�ed on 2-l 1�5 7 by ?� phone_ letter _in person �-=''S' ``'=T '�'�r�`•����
L<-T C�iT/Zt�/ /�S��t/D[.0 7"/�iS GU/G� ,f�i� ;�=^,'r. :,_'-/J T� �j�Ji•✓ �/—��',�i��
/�'�rt� �r- t� , - �/' � , _ ` .
✓ �� i Lfj� ��-�"l�ilf ru.c/��� /,f'G,%�f T C�'"' i�-�7.��: �:• .
'SPOSIT/ON: Tumed to On by OR: No further action recommended because:
Lead agency has been notified:
_ Probtem has been corrected. _ No problem has been ident�ed. Prior investigation addresses problem:
—See Fle # -
_ �te problern - NDAP will noi consider because:
Water originates onsfte and/or on neighboring parcet
_ Location is outside SWM Senrice _O:her (Specify):
�ATE CLOSED: ��� by:
����� �ii/��i��I�
. . t . -__._ "__ I
-.. ...._ v�. ... ..
Kin Coun �
9 �► FILE NO. 9G- 050
2
Surface Water
Management NAME KEVIN NGUYEN I
s.�.. f�•�• �� ADDRESS 12601 - SE PETROVITSKY RD �
PHONE 266-4724 TB PAGE 656-F7 ��
DRAINAGE INVESTIGATION REPORT KROLL PAGE so2E DATE ,2-2,-9s
FIELD INVESTIGATION MAINT. DIVISION a
INITIALS - MAM �
DETAILS OF INVESTIGATION:
5{TE VI51T ON 12-18-96. FLOODING OF YARD FROM CREEK. �I
INVESTIGATFON FOUND PROPERTY BORDERS A DRAINAGE CHANNEL/STREAM_ THE CHANNEL HAS APPROXIMATELY 2 FEET N ,
OF FREEBOARD. THE YARD IS MOSTLY FLAT AND AREAS IN THE YARD HAD STANDING WATER. DUE TO THE LACK OF
SLOPE ON THE PROPERTY IT DID NOT APPEAR THIS AREA WILL DRAIN NATURALLY. THE DRAINAGE CHANNEL li
BORDERING THE PROPERTY IS HEAVILY VEGETATED AND AREAS WITHIN CHANNEL HAYE BECOME CF{OCKED WITH TREES
AND DEBRIS. I
PHOTOS TAKEN � 1 LOOKING AT BACKYARD OF HOUSE 12601 - SE PETROVITSKY RD.
� 2 LOOKING AT SOUTH END OF CROSS-CULVERT UNDER SE PETROVITSKY RD.
#� 9 LOOKING INTO DRAINAGE CHANNEL FROM THE PROPERTY AT 12601 -SE PETROVITSKY RD.
+M ♦ LOOKING INTO DRAINAGE CHANNEL FROM THE PROPERTV AT 12601 - SE PETROVITSKY RD.
I
' ��
j I
f DRAINAGE CHANNEL i
� i
SKETCH: 2
38' CMP SE PETROVITSKY RD
18'CMP
. � DRIVEWAY
�
�
� HOUSE
� 12E0/
z
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4
� n.1�C� I,UUNTY �1'ATER A�� LAl�'D KESOURCES llIVISION
�-�--�
DRAINAGE INVESTIGATION REPORT
i Page 1: INVESTIGAT[ON REQUEST Type ����
PROBLE�9: ��� �
pr�'�I�'ED BY: Date: / n'^ OK'd b �: FILE I�'O. ��_ ��,�
�i��ed from:
, (Day) �� (Eve) �,_1
I�TAME: " r C� PHONE /IOl'IL��/!h°!7
ADDRESS: 1'_ City ��.( /�/y',U�/'J State Zip ^�
Location of problem, if different: /���j_ `� �"�� �� �',�' ���`��
/ v �
Reported Problem: CALL FIRST ❑ (Would Like To Be Present}
� �' . , � � � - �-�'�i �.�� ���r�-��!1/
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-���iz��. v ir� t��i�� d'� ���;
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' --�me: � �.-./;J(/,C_?.G.t�'��•'1�1��i Lot I�'o: ; �._, Block I�To:
� Jther agencies im�ol��ed: No field investigation required
- (initials)
• . TO BE CORIPLETED BY CO111PLA1NT PROCRAM STAFF , • . - - �
r-� r% �,� i�
1�. (7�-2J C/'li� L l
�,�/
%a S T R Parcel No. .�9�i �i�G�;�o�� Kroll '���'`''-�Th.Bros: New�2��
. ��
Old �� ��.'SI '
" Basin Jv� Council District �P Charge No. �'�
ZESPOI�'sE: Citizen notified on by: phone letter in person
)ISPOSITIO'��: Tumed to on / / by OR: No further action recommended because:
�Lead agency has been notified: /�/�; F����/yri%
_ Problem has been corrected. No problem has been identified_ Prior investigation addresses problem:
SEE FILE 1�
_ "rivate problem - NDAP will not consider because:
���ater originates onsite and/or on neighboring parcel.
Location is outside WLRD Servi e . Other (Specify):
�ATE CLOSED: �/��/�4 By:
:�
'' �%�DS
.� �
-"` ��--
�:�_
14 July, 1998
King County Department of Natural Resources
Surface Water Management Division
700 Fifth Avenue, Suite 2200
Seattle, WA 98104
Re: Cascade Vista Drainage
I own a home at 17321 125 Ave SE, Renton, WA. { have asked the public works
people several times over the past 14 years to eliminate the standing water in the
� street in front of my home. They have come out and investigated and investigated
and once even drilled some holes in the pavement. Their efforts have not worked.
There is no effective drainage present.
Please can you help the public works people solve this problem?
I believe it could be solved by adding additional paving to the street or better yet a
storm drain. The standing water smells bad and has mosquitoes around it at certain
times in the year. Perhaps this is somethinq which needs to be bro�aght to the
attention of the health department.
Please keep me informed as to what your solutior is and when the problem �vill be
resofved.
Thanks.
__ ,1
� � �_ �
David R. Jone
890 West E A ue
POB 277
LaCenter, WA 98629
4:43 PM 07/14/98 cldrjoneslrenlals117321\general117321-OZ.doc
-_... a..�
KING COUNTY WATER AND LAND RESOURCES DIVISION M A,�/1""—'—
DRAINAGE INVESTIGATION REPORT
Page 1: INVF.STIGATION REQUEST Type �
PROBL.EM:
•ErvID sY•� Date•Vll� . OK'd bt►- ���' Fn.E No Q� '��o ,
l.eceived from: '
. . ,,���, ` �
- - --- --- .---- �ay� � --- -- �Ve� i----� —
N�: ���'��� t.�,��c,�C;� � Z 2Lo— 2 S-7`�
ADvxEss: � �4 ZU -��YUII( City State Zip���5
Location of problem, if different:
Reported Problem: CALL FIRST (Wou1d Like To Be Present) - �
�u,�d- Y� 0 v� ' v1. I'ur� <<9'�- �2� �u(�K (,ut��
^r�+G� . � ,��' �� n�� o��� , u!���--
��.d d1fu.,t „
� �), �� a�.�o �t l�d, u1 0� �;�w� t� , � � �,,e '�ru,r ��
dhr�,c:n.o --�v �� Ch�• S l�!� u���� `�,[.�u� ��G�e�--
t,j'�- �-Y1� ah�� . " 9 r�- a�,�-�
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�o,�� �N���tt
, �
. .�. name: 'J�'�'��y,,,- ��-G� 2��� �4 Lot No: 7 Block No!
Other agencies involved: No field investigation required
1� (initials
. . . � T'BD OMPL'�'pRO�G��� "
�.
� .� _��� -- - - --
�/4 S T R Parcel No.b—1�aQO-6��Kroll��2-� Th.Bros: New �S� �`�
01d 4 2 1�-�-
Basu��3� Coum:il District� Charge N�.
RESPONSE: Citizen notified on � L - �t 9 by: � phone� letter in person
����"T /�tSs�G,� To G�.�� c- . � uI/LL �iZOv�b7 c�vvf �.✓Fa.�c�+�vi
l�o.wr o,� L''v.✓��T �j(��� ��.c/s�'!D.Q t 2 9 6 -: �od g� f�t>N c� �O�Nj���.4 iiv/3 !v r"
JP�rN,e,vs /�j�-�S.�u �•
D�sposrr;oN: Turned to on / / by OR: No further action recommended because:
_�C Lead agency has been notified: � 17 c�� ��� � �`—��e C�-�-s��,�7�'
� Problem has been corrected. No problem has been identified. Prior investigation addresses problem:
SEE Fu..E#
_ Private problem -NDAP will not consider because:
Water originates onsite and/or on neighboring parcel.
Location is outside WLRD Servi . Other (Specify):
DATE CLOSED: �/ � / �9 By:
�������
� K1N� COUNTY FIL.E NO. 99-0466
� Department of Natura) Resources NAME EMILY DILLARD
• �� Water and Land Resource Division .�DDRESS 12420 - SE PETROVITSKY ROAD
PHONE (425)226-2575 TB PAGE 656-F7
DRAINAGE INVESTIGATION REPORT KROLI. PAGE so2E DATE s-2s-99
FIELD INVESTICATION MAINT DIVISION 4
INITIALS - MAM
DETAILS OF INVESTIGATION:
SITE VISIT ON 6-18-99. NEIGHBOR FILLING !N PROPERTY AND CHANGED DRAINAGE. �
INVESTIGATION FOUND THE PROPERTY AT 17409 - 126TH AVE SE HAS ADDED FILL. IN TALKING TO THE
COMPLAINANT ABOUT THE FILLING SHE STATED 26 TRUCK LOADS OF MATERIAL WERE DUMPED. THE DRAINAGE WHICH
USE TO FLOW THROUGH HIS PROPERTY HAS BEEN CHANGED AND WILL NOW FLOW THROUGH HER PROPERTY.THE CULVERT NTS
UNDER HIS DRIVEWAY IS NOW BURIED AND HER PROPERTY WILL BE FLOODED MORE THEN IN THE PAST.THE PROPERTY
TO THE WEST OF HER IS LOWER AND t1SE TO DRAIN BUT BECAUSE OF FILL SHE FEARS tT WILL RUN THROUGH HER
PROPERTY. THtS AREA DRAINS TO SOOS CREEK.
PHOTOS TAKEN #F 1 IOOKING AT 126TH AVE SE PRIVATE ROAD WHICH LEADS TO 17409.
# 2 AREA NEXT TO HOUSE CLEARED AND FILL ADDED.
# 9 AREA IN FRONT OF HOUSE FILL ADDED.
� 4 COMPLAINANTS PROPERTY JUST SOUTH OF FILL.
i
� �
I HOUSE I
17009 -...._ ..��:i�.........._i-.
� �
� �
SKETCII_ � � �
' I - I
'
j 2 I
I AREA FfLLED P�No 3 I
I
i _ :
I
I
I � ` � � FLOW DIRECTION
� _ .
. . . . . � - . - - - - "�
�
� FLOW DIRECTION �� I - - - - - - - - - - - - : .
/
' � I � 4
�
I
I
� HOUSE
12920
f
' a� 1
I
SE PETROVITSKY ROAD
� KING COUNTY WATER AND LAND RESOUR�IVISION NI A 7�
DRAINAGE INVESTIGAI`ION REPORT Z'2 3-o�
� MVESfIGATION REQUEST Type C
PROBLEM:
VED BY: Date:� OK'd b :��FILE NO. 2001
Received from: '
. � ����-�
- -- — _ -- -
�/1� tOtl*tn�� (Da�}—f�ra�-�. �- (Eve) �.�
NAME: HONE 3���
ADDRESS:���p�� (��TTII.c��C�City . State��_ Zlp��
LOCATION OF PROBLEM, 1F DIFFERENT: � �^
V
Access Permission Granted � Call F�rsi (Would Like To Be Present)�
aw��� a��o 9 ��-6� ��s� .��
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o� , _ _ �
,�►v� ' � ��c.� �
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�,�-� ,—�,� � ����--
y Z 5:-Z z.g-39 �8'
Plat name: �y���� Lot No: Block No:
a
Other agencies invotved: No field investigation required
f;.; .,� � . .�� �-- �. �4�� .� �- �r� zv �
��..- �-�- Tb$E;+�L�`p TE'� 1'.COMP Re� , ��` w
-�,�� �_.� =.�.�- _�.� .�,�-�.� �. :i.
`—
l�a S T R Pazcel No.�,7_�/ Kroll�� Th.Bros: New '
Basin �� Council District� Charge No.
RESPONSE: Citizen notified on �/-/o- o/ by: _�, phone letter in person
L�-T �')1r'!Z�:�! /�Cl4�`�'� /N�c+CJk.F)'"/O�v /�C�.✓G. /�Z�F�'�'ne�-7' r0
�I�CS /�vie �-v[.Ltxu ��i
DiSPOStT1oN: Turned to on / / by OR: No further action recommended because:
� Lead agency has been notified_ �%ES �� �� �/G���P�'�'�''�T C-'����-��
Problem has been corrected. No problem has been identified. Prior investigation addresses problem:
SEE FILE #�
_ �rivate problem -NDAP will not consider because:
Water originates onsite and/or on neighboring parcel.
Location is outside WL__FJDG����e Area_ Other(Specify):
DATE CLOSED: / ��/ �� By: �
��� /O.� �`��
-- - -- - _—_._. .-`'-�=.`.`�-��'�t� s
To: Randy Sandin,Supervisor From: Larry Gettle,Seoior Engineer
� Kin� County Development& Environmental Services Water and Land Resources Division
Departrnent Of Natural Resources
Water and Land Resource Site Development Services Local Drainage Services Unit
Mail Stop OAK-DE-0100 Mail Stop KSC-NR-0600
, � ,_ . , _
��'SITBJECT:`COMPLAINT 01-0109 Frank Segoui: ; ` �� ` ..° .` ' : '` �' }°�
;,v�
MESSAGE: Date 04-21-01
Initials MAM
The properly at 27409 - 126 Ave SE and property owner at I2510 SE Petrovitsky are having a dispute with
natnral drainage course. Complainants allege adjacent property owner(17409}has constructed drainage
swale and diverted flow onto their property. Our investigation identified that filling and grading has
occurred over the years on the properties. It appears this has altered the drainage course and may impact
adjacent wetland. For more information see attached complaint investigation.
� - �,
a/a.3/o/
�� �
`' C� G�. �l�n� G�:�
REPLY: " ,
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O KI N G C O U N TY NAME FRANK SEGOUTA
Departmen[ of Natural Resources aDDREss 2o1s - EDMONDS DR. SE
Water and Land Resource Division pHONE (425)228-3968
TB PAGE 656-F7
KROLL PAGE 602 DATE 3-12-01
DRAINAGE INVESTIGATION REPORT MAINT. DIVISION a
FIELD INVESTIGATION INITIALS -MAM �
DETAILS OF INVESTIGATION:
SITE VISIT ON 3-OS-OI. NEIGHBOR CONSTRUCTING DRAINAGE CHANNEL ON PROPERTY
INVESTIGATION FOUND THE PROPERTY OWNER AT 17409 - 126TH AVE SE HAS ENTERED COMPLAINANTS PROPERTY N
AND DUG Q CHANNEL TO ALLOW POND ON PROPERTY TO DRAIN. IN LOOKING AT THE AREA AND OLD TOPO MAPS IT
APPEARS A POND ON THE COMPLAINANT'S PROPERTY HAS BEEN FILLED AND DRAINAGE WAS DIRECTED THROUGH THE NTS
PROPERTY. OVER THE YEARS THIS CHANNEL HAS BECOME LESS DEfiNED. THE PROPEqTY OWNER AT 17409 HAS BEEN ,
BRINGING IN FILL OVER TME YEARS AND HAS REDUCED THE POND AREA ON HIS PROPERTY. TO ALLOW HIS POND TO
DRAIN HE HAS ATTEMPTED TO REESTABLISH THIS CHANNEL. HE DID NOT OBTAIN COMPLAINANT'S PERMISSION TO DO
THIS WORK AND NOW COMPLAINANT WANTS AREA RETURNED TO IT'S NATURAL STATE. IN TALKING TO THE '
COMPLAINANT 1 TOLD HER IT APPEARED TO ME THEIR PROPERTY HAD A POND WHICH WAS FILLED AND PROPERTY
GRADED TO ALLOW WATER TO FLOW FROM NEIGHBORS POND THROt1GH THEIR PROPERTY. 1 ALSO EXPLAINED THE
TRESPASSING ISSUE IS SOMETHING THEY WOULD HAVE TO RESOLVE WITH THEIR NEIGHBOR. I
PHOTOS TAKEN # 1 SHOWING CHANNEL CLEARED ON COMPLAINANT'S PROPERTY BY NEIGHBOR_
#2 SHOWING FILLINGJGRADING BV PROPERTY OWNER AT 17409- 126TH AVE SE.
SKETCH:
SENSITIVE AREA FOI O
MAP WEfLAND 104
HOUSE '
17409 - � � 7 (
� /
� / OLD POND I I
l ON TOPO MAP� I
� / �
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PON � �
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CUL E SIGNS OF CHANNEL
HOUSE
2 t2510
SE PETROVITSKE RD
TASK 5
MITIGATION OF EXISTING �R POTENTIAL
PROBLEMS
TASK 5 MITIGATION OF EXISTING OR POTENTIAL PROBLEMS
The area downstream of the proposed project lrnown as the Do Short Plat had a couple of existing
problems noted in the drainage complaints. Since the 1998 King County Washington Surface
Water Design Manual has indicated that basic water quality and Level 1 Flow Control is the
required means of treating and detaining r�noff(wlvch meets the requirements of the Soos Creek
Basin plan as well),this project proposes a modified Level 1 Flow Control by holding the 10-year
peak to the pre-developed 2-year flow rate thereby increasing the amount of detention on-site
which should alleviate any problems that could be occurring from the development of this
proposed project. Therefore, this project should neither aggravate nor create a problem as
specified in the problem specific mitigation requirements set forth in Section 1.2.2.1 of the 1998
King County Washington Surface Water Design Manual as delineated in Task 4 of this report. A
Level 2 or Level 3 off-site analysis should not be required for this project site since we are
providing the additional flow control. In addition,the project site is not flat nor is the downstream
drainage course flat. T'he project site dces not contribute more than 15 percent of the total peak
flow drainage downstream from the site. i
7721.007(JPJ/bq]
EXHIBIT B
� DETENTION SYSTEM
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BARGHAUSEN DATE: I2'�S I OZ PAGE OF
CONSULTING ENGINEER: ��
ENGINEERS, INC. PROJECT#: 77Z 1
PROJECT/SUBJECT: �X�Sfl rt �6nol.��-i61'�5 /70 Sho r'�" P��"
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BARGHAUSEN DATE: I2�'JIOL PAGE OF
CONSULTING ENGINEER: J�'� �O�-
ENGINEERS, INC. PROJECT#: Do shoit Pla.d- �77��
PROJECT/SUBJECT: DP,U{,l0(1�d C����S
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po short Pla�
KCRTS Command # 77 2'
CREATE a new Time Series mCG��f��ed Le�� �
----------------------- �2 f 3' 02
Production of Runoff Time Series
Project Location : Sea-Tac
Computing Series : 7721pre.tsf
R.egional Scale Factor : 1.00
Data Type : Reduced
Creating Hourly Time Series File
Loading Time Series File:C: \KC_SWDM\KC_DATA\STTG60R.rnf .
I'ill Grass 1.04 acres
Loading Time Series File:C:\KC_SWDM\KC_DATA\STEI60R.rnf .
Imper�.�ious 0.07 acres
--------------
Total Area : 1.11 acres
Peak Discharge: 0.253 CFS at 6:00 on Jan 9 in Year 8
Storing Time Series File:7721pre.tsf .
Time Series Computed
KCRTS Command
Enter tne Analysis TOOLS Module
------------------------
Analysis Tools Com:.and
—------------------
Compute PEAKS and Flow Frequencies
----------------------------------
Loading Stage/Discharge curve:7721pre.tsf .
Flow Frequency Analysis
--------------------------------------------------------
Time Series File:7721pre.tsf
Project Location:Sea-Tac
Frequencies & Peaks saved to File:7721pre.pks .
Analysis Tools Command
----------------------
RETURN to Previous Menu
---------------------
KCRTS Command
CREATE a new Time Series
-----------------------
Production of Runoff Time Series
Project Location : Sea-Tac
Computing Series : 7721dev.tsf
Regional Scale Factor : 1.00
Data Type : Reduced
Creating Hourly Time Series File
Loading Time Series File:C: \KC_SWDM\KC_DATA\STTG60R.rnf .
T�11 Grass 0.58 acres
Loading Time Series File:C: `•.KC__S6VD2�f\.K.C_DATA\STEI60F,.rn` . !
I^��pervious 0.53 acres !
�i�otal Area : l .il acres
Peak Discharge: 0.373 CFS at 6:00 on Jan 9 in Year 8
Storing Time Series File:7721dev.tsf .
Time Series Computed
KCRTS Command
Enter the Analysis TOOLS Module
-------------------------------
Analysis Tools Command
---------------------
Compute PEAKS and Flow Frequencies
----------------------------------
Loading Stage/Discharge curve:7721dev.tsf .
Flow Frequency Analysis
--------------------------------------------------------
Time Series File:7721dev.tsf
Project Location:Sea-Tac
Frequencies & Peaks saved to File:7721dev.pks .
Analysis Tools Command
----------------------
RETURN to Previous Menu
-----------------------
KCRTS Command
Size a Retention/Detention FACILITY
-----------------------------------
Edit Facility
Loading Time Series File:7721dev.tsf .
Time Series Found in Memory:7721dev.tsf .
Saving Retention/Detention Facility File:7721convey.rdf .
Starting Documentation File:c: \kc_swdm\7773\3-1-02\7721convey.doc .
Time Series Found in Memory:7721dev.tsf .
Edit Complete
Retention/Detention Facility Design
-----------------------------------
End Sizing Retention/Detention Facility
KCRTS Command
eXit KCRTS Program
I
�� Flow Frequency Analysis
'� Time Series File:7721pre.tsf
' Project Location:Sea-Tac
,i
� ---Annual Peak Flow Rates-- -----Flow Frequency Analysis-----
Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob
(CFS) (CFS? Period
�' 0.110 4 2/09/01 2:00 0.253 1 100.00 0.990
, 0.062 6 1/05/02 16:00 0.138 2 25 .00 0.960
0.138 2 2/27/03 7:00 0.114 3 10 .00 0.900
0.037 8 8/26/04 2 :00 0.110 4 5.00 0.800
0.062 7 1/05/05 8:00 0.103 5 3 .00 0 .667
� 0.114 3 1/18/06 16:00 � 0.062 6 2 .00 0 .500
''� 0.103 5 11/24/06 3 :00 0. 062 7 1.30 0 .231
! 0.253 1 1/09/08 6:00 0.037 8 1.10 0.091
Computed Peaks 0.215 50. 00 0.980
I
�
�I
Flow Frequency Analysis
Time Series File:7721dev.tsf
Project Location:Sea-Tac
---Annual Peak Flow Rates--- -----Flow Frequency Analysis-------
Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob
(CFS) (CFS} Period
0.180 5 2/09/O1 2:00 0.373 1 100.00 0. 990
0.140 8 1/05/02 16:00 0.218 2 25.00 0.960
0.218 2 2/27/03 7:00 0.208 3 10.00 0.900
0.143 7 8/26/04 2:00 0.190 4 5.00 0.800
0.174 6 10/28/04 16:00 0.180 5 3 .00 0.667
0.190 4 1/18/06 16:00 0.174 6 2 .00 0.500
0.208 3 10/26/06 0:00 0.143 7 1.30 0.231
0.373 1 1/09/08 6:00 0.140 8 1 .10 0.091
Computed Peaks 0.321 50 .00 0.980
�I
Retention/Detention Facility
Type of Facility: Detention Vault
Facility Length: 31.40 ft
Facility Width: 31.40 ft
Facility Area: 986. sq. ft
Effective Storage Depth: 5.40 ft
Stage 0 Elevation: 389.60 ft
Storage Volume: 5324. cu. ft
Riser Head: 5.40 ft
Riser Diameter: 12.00 inches
Number of orifices: 1
Full Head Pipe
Orifice # Height Diameter Discharge Diameter
(ft) (in) (CFS) (in)
1 0.00 0.99 0.062
Top Notch Weir: None
Outflow Rating Curve: None
Stage Elevation Storage Discharge Percolation
(ft) (ft) (cu. ft) (ac-ft) icfs) (cfs)
0.00 389.60 0. 0.000 0.000 0.00
0.01 389.61 10. 0.000 0.003 0.00
0.02 389.62 20. 0.000 0.004 0.00
0.03 389.63 30. 0.001 0.005 0.00
0 .04 389.64 39. 0.001 0.005 0.00
0.05 389.65 49. 0.001 0.006 0.00
0.06 389.66 59. 0.001 0.007 0.00
0.07 389.67 69. 0.002 0.007 0.00
0.08 389.68 79. 0.002 0.008 0_00
0.18 389.78 178. 0.004 0.011 0.00
0.28 389.88 276. 0.006 0.014 0.00
0.38 389.98 375. 0.009 0.017 0.00
0.48 390.08 473 . 0.011 0.019 0.00
0.58 390.18 572. 0.013 0.020 0.00
0.68 390.28 671. 0.015 0.022 0.00
0 .78 390.38 769. 0.018 0.024 0.00
0 .88 390.48 868. 0.020 0.025 0.00
0 .98 390.58 966. 0.022 0.026 0.00
1.08 390.68 1065 . 0.024 0.028 0.00
1.18 390.78 1164. 0.027 0.029 0 .00
1.28 390.88 1262. 0.029 0.030 0.00
1.38 390.98 1361. 0.031 0.031 0.00
1.48 391.08 1459. 0.034 0.033 0.00
1.58 391.18 1558. 0.036 0.034 0.00
1.68 391.28 1657. 0.038 0.035 0.00
1.78 391.38 1755. 0.040 0.036 0.00
1.88 391.48 1854. 0.043 0.�37 0.00
1 .98 391 .58 1952. 0.045 0.038 0.00
2 .08 391.68 2051. 0.047 0.039 0.00
2 .18 391.78 2150. 0.049 0.039 0.00
2 .28 391.88 2248. 0.052 0.040 0.00
2 .38 391.98 2347. 0.054 0 .041 0.00
2 .48 392 .08 2445. 0.056 0 .042 0 .00
2 .58 392 .18 2544. 0.058 0 .043 0.00
2 .68 392 .28 2642. 0.061 0.044 0 .00
2.78 392 .38 2741. 0.063 0.045 0.00
2.88 392 .48 2840. 0.065 0.045 0.00
2.98 392 .58 2938. 0.067 0.046 0.00
3 .08 392 .68 3037. 0.070 0.047 0.00
3 .18 392 .78 3135. 0.072 0.048 0.00
3 .28 392 .88 3234. 0.074 0.048 0.00
3 .38 392 .98 3333. 0.077 0.049 0.00
3 .48 393 .08 3431. 0.079 0.050 0.00
3 .58 393 .18 3530. 0.081 0.051 0.00
3 .68 393 .28 3628. 0.083 0.051 0.00
3 .78 393 .38 3727. 0 .086 0.052 0.00
3 .88 393 .48 3826. 0 .088 0. 053 0.00
3 .98 393 .58 3924. 0 .090 0. 053 0. 00
4.08 393 .68 4023 . 0 .092 0.054 0. 00
4 .18 393 .78 4121. 0 .095 0.055 0. 00
4.28 393 .88 4220. 0.097 0.055 0. 00
4.38 393 .98 4319. 0.099 0.056 0.00
4.48 394.08 4417 . 0.101 0.057 0 .00
4.58 394.18 4516. 0.104 0.057 0.00
4.68 394.28 4614. 0.106 0.058 0.00
4.78 394 .38 4713. 0.108 0.058 0.00
4.88 394 .48 4812. 0.110 0.059 0.00
4.98 394 .58 4910. �.113 0.060 0.00
' S.08 394.68 5009. 0.115 0.060 0_00
5.18 394.78 5107. 0.117 0.061 0.00
5.28 394.88 5206. 0.12a 0.061 0.�0
5.38 394.98 5305. 0.122 0.062 0.00
5.40 395.00 5324. 0.122 0.062 0.00
5.50 395.1Q 5423. 0.124 0.371 0.00
5.60 395.20 5522. 0.127 0.934 0. 00
5.70 395.30 5620. 0.129 1.660 0.00
5.80 395.40 5719. 0.131 2.460 0.00
5.90 395.50 5817. 0.134 2 .740 0.00
6.00 395.60 5916. 0.136 2 .990 0.00
6.10 395.70 6015. 0.138 3 .230 0.00
6 .20 395.80 6113 . 0.140 3 .450 0.00
6.30 395.90 6212 . 0.143 3 .650 0.00
6 .40 396.00 6310. 0.145 3.850 0.00
6.50 396.10 6409 . 0.147 4.030 0.00
6.60 396.20 6508 . 0.149 4.210 0.00
6.70 396.30 6606. 0.152 4.380 0.00
6.80 396.40 6705. 0.154 4.540 0. 00
6.90 396 .50 6803. 0.156 4.700 0. 00
7.00 396.60 6902. 0.158 4.850 0.00
7.10 396.70 7001. 0.161 5.000 0.00
7 .20 396.80 7099. 0.163 5.150 0.00
7.30 396.90 7198. 0 .165 5.290 0.00
7.40 397.OQ 7296. 0 .167 5.420 0 . 00
Hyd Inflow Outflow Peak Storage
Target Calc Stage Elev (Cu-Ft} (Ac-Ft)
1 0.37 ******* 0.31 5.48 395.08 5402. 0.124
2 0.18 ******* 0.14 5.43 395.03 5350. 0.123
3 0.21 0.06 0.06 5.39 394. 99 5310. 0.122
4 0 .19 ***x*** 0.06 5. 1� 394 .74 5069. 0 . 116
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8�0' 0 '8S9T 8Z'T6£ 89'i 60'0 ������� 6T'0 L
�90'0 'S�6Z 85' Z6£ 86' Z SO'0 �����*� LT'0 9
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Flow Frequency Analysis
Time Series File:7721rdout.tsf
Project Location:Sea-Tac
---Annual Peak Flow Rates--- -----Flow Frequency Analysis
Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob
CFS F ft P r' d
( ) (C S) ( ) e io
0.144 2 2/09/Ol 15:00 0.305 5.48 1 100.00 0 . 990
0.035 7 1/06/02 6:00 0.144 5.43 2 25.00 0.960
0.056 5 2/28/03 7:00 0.062 5.39 3 10.00 0.900 �r r1`�LtfC�1�'S
0.031 8 8/24/04 0:00 0.061 5.14 4 5.00 0.800 �_ �r n f� —
0.046 6 1/05/05 Z4:00 0.056 4.42 5 3.00 0.667 � (; �
0. 061 4 1/18/06 22 :00 0.046 2 .98 6 2 .00 0.500 �t'yr��! ��� ``
0_062 3 11/24/06 8:00 0.035 1.68 7 1.30 0.231
0.305 1 1/09/08 9:00 0.031 1.40 8 1. 10 0.091
Computed Peaks 0.252 5.46 50. 00 0 .980
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EXHIBIT C
WATER QUALITY SYSTEM ,
BARGHAUSEN DATE: I2I3 f 42 PAGE OF
CONSULTING ENGINEER: �EQ
ENGINEERS, INC. PROJECT#: �T7ZI
PROJECT/SUBJECT: W�U' Q�G� DO <S{70/�" V ICc�"
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EXHIBIT D
CONVEYANCE SYSTEM
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No. Dala By Ckd. pDr. R�M�ion
Job Numno !„!/i� D�a{6rod.S11 9Cale: �,: T��
�� vs 18215 72ND AVENUE SOUTH XUYEN DO DEVELOPED CONDITIONS
]�2� mP � KENT, WA 98032 wow� Js[R Monmrrta�
k o (azs)zs�-s22z �,,,,�,,�„� 23241109TH PLACE S.E. BA81N MAP
Sns�t n '
�R (425)25t-8762 FAX �••20•
ry �' �wo•«�•e�eo_ �.�Ka� KENT, WA 98031
s� e' CML ENCINEERINC,UNo�N�N�. ,�.z. DO PROPERTY
CI� �l �cp SURVEYING,EIMRONMEMAL SERVICES uab,�„- (253) 850-0701
G � � �N�ENG�H�
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BARGFIAUSEN CONSULiING ENGINEERS-PIPE FLOW CALCULATqR
using the Rational Method&Manning Formula
KING COUNTY DESIGN FOR 25 VEAR STORM
JOB NAME: Do Short Plat NOTE:ENTER DEFAULTS AND STORM DATA BEFORE BEGINNING
JOBIt: 7721 DEFAULTS C= 0.9 n= 0.014
FILE#: 7721conv.xls d= 12 Tc= 6.3 .
A=Contributing Area(Ac) 9d=Design Flow(cts) COEFFICIENTS FOR THE RATIONAL METHOD"Ir"-EQUATION .
C=Runoff Coefficlent 9f=Full Capacity Flow(cfs) STORM Ar Br
Tc=Time of Conceniration(min) Vd=Velocity at Design Flow(fps) 2YR 1.58 0.58
I=Intensity at Tc(in/hr) Vf=Velocity at Full Flow(fps) lOYR 2.44 0.64 PRECIP= 3.4
d=Diameter of Pipe(in) s=Slope of pipe<�) 25VR 2.66 0.65 Ar= 2.66
L=Lengih of Pipe(ff) n=Manning Roughness Coefficlent 50YR 2.75 0.65 Br= 0.65
D=Water Depth at 61d(in) Tt=Travel Time at Vd(min) 100VR 2.61 0.63
FROM TO A s L d Tc n C SUM A A'C SUM A'C I Qd 9f Qd/Qf D/d D Vf Vd Tt
----- --- - - ------ ----------------------- ------ ------ -------------- ------ ------ ------ ------ ------ ------ _--_-_______
CB1 CB2 0.47 1.00 70 12 6.3 0.014 0.9 0.4697 0.42 0.42 2.73 1.16 3.31 0.349 0.408 4.90 4.21 3.85 0.30 '
C83 CB2 0.17 1.00 40 12 6.3 0.014 0.9 0.1738 0.16 0.16 2.73 0.43 3.31 0.129 0.243 2.92 4.21 2.87 0.23 :
CB2 VAULT 0.00 20.00 16 12 6.5 0.014 0.9 0.6435 0.00 0,58 2.67 1.55 14.79 0.105 0.220 2.63 18,85 12.14 0.02
VAULT OUTLET 0.00 0.50 97 12 6.3 0.014 0.9 0 0.00 0,00 2.73 0.31 2.34 0.130 0.244 2.93 2.98 2.04 0.79 :
Page 1
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EXHIBIT E
EROSION AND SEDIMENT
CONTROL (ESC) PLAN
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.bD NumDe� Seoie:
�G�'4�/� 18215 72ND AVENUE SOUTH °"�'"° 'E"` F0� XUYEN DO DEMOLRION AND TESC PLAN
TfQ� P � KENT, WA 98032 0"�" � �'"'oM'� 23241109TH PLACE 3.E.
m �� Z (425)251-6222 �wa�� +'-p'
sn.e � (425)251-8782 FAX
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s� w 5� CML ENCWEERINC.UND PUNNING. � DO PROPERTY
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