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TECHNICAL INFORMATION REPORT 1�
of �'
HIGHLAND OASIS DUPLEXES 1� ;'(�
1419 Jefferson Avenue NE �v
Renton, WA
for
Andrew Wang
12419 NE 140`" Street
Kirkland, WA 98034
by
THE LAND DEVELOPER'S
ENGINEERED SOLUTION
A Division of THE LAND DEVELOPER, LLC
Erik B. Ainsworth, PE '�
PO Box 4420 I
Tumwater, WA 98501
(360) 250-3973 �,�����,���t��T;;�;
�ECEIVED
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TABLE OF CONTENTS
PROJECTOVERVIEW.......................................................................3
CONDITIONS AND REQUIREMENTS SUMMARY............................5
CORE REQ I. DISCHARGE AT NATURAL LOCATION...................5
CORE REQ II. OFFSITE ANALYSIS ................................................5
CORE REQ III. FLOW CONTROL ....................................................5
EXISTING SITE HYDROLOGY........................................................................................5
DEVELOPED SITE HYDROLOGY, PERFORMANCE STANDARDS & FLOW
CONTROLSYSTEM ........................................................................................................6
CORE REQ IV. CONVEYANCE SYSTEM ........................................6
CORE REQ V. EROSION AND SEDIMENT CONTROL ...................6
CORE REQ VI. MAINTENANCE AND OPERATION ........................6
CORE REQ VII. FINANCIAL GUARANTEES AND LIABiLITY ........7
CORE REQ VIII. WATER QUALITY .................................................7 �
SPECIAL REQUIREMENTS .............7 I'I
..................................................
SPECIAL REQ I. OTHER AREA SPECIFIC REQUIREMENTS...........................................7 ''
SPECIAL REQ II. FLOOD HAZARD DELINEATION............................................................7
SPECIAL REQ III. FLOOD PROTECTION FACILITIES.......................................................7
SPECIAL REQ IV. SOURCE CONTROL..............................................................................7
SPECIALREQ V. OIL CONTROL........................................................................................7
APPENDICES
Appendix A Drainage&Erosion Control Plan
Appendix B Stormwater Best Management Practices for Single Family
Residential Activities Guide
Appendix C Residential Declaration of Covenants
Appendix D Stormwater Maintenance Plan
Appendix E Geotechnical Report
Appendix F KCRTS Drainage Analysis
Highland Oasis Duplexes September 20,2015 Page 2
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PROJECT OVERVIEW
This Technical Information Report was determined to be required as a result of the proposed
construction of two duplexes. This project is being reviewed under Peak Rate Flow Control
Standards. There are no existing structures on the lot. The existing lot is 0.257 acres. The
proposal includes the construction of two 1,535 sf duplexes residences, two garage structures that
are 425 sf and 640 sf of paved driveway and parking area. Frontage improvements include
reducing the frontage pavement area by approximately 3.5 feet in width and adding curb gutter and
sidewalk total 430 sf. The middle common area is proposed to have 240 sf of paver area. There �
will be approximately 0.1434 acres of landscaped area. The site address is 1419 Jefferson Ave '
NE, in Renton,Washington. The parcel number is 722780-1625. The legal description as shown
on the King County Assessor Website is as follows
Lot 13, Block 46, Renton Highlands, No. 2, City of Renton, records of King County Washington.
The 2009 King County SurFace Water Design Manual as amended by the City of Renton was used
for this design. This project is located in urban area with residential lots on the north, south, east
and west sides of the project. A KCRTS analysis was run for the site that shows that this project
does not increase stormwater release from the site by more than 0.1 cfs during the 100-year
design event therefore this project is not required to mitigate stormwater discharge rates.
Utilizing Appendix C of the 2009 King County Surface Water Design Manual for small projects
Section C.1.3.1.A.3,the required amount of impervious surface relative to the overall site area that
must be mitigated is 10%for projects up to 11,000 sf in size, and 20%for project between 11,000
sf and 22,000 sf. The proposed project area is 11,195 sf. A weighted average for the amount over
11,000 sf was used to determine the required amount of impervious surface to mitigate. The
required amount of impervious surface to mitigate is therefore 11,OOOsf*0.1 + 195sf'0.2 = 1,139
sf. The project proposes to mitigate the impervious area of the two main apartment structures
which are a total of 3,920 sf. Even if we were required to mitigate 20%for the whole project that
would be 2,239 sf and this project is mitigating more than that. Stormwater from the garage roofs
will discharge via downspout splash blocks and flow offsite to the west.
The project proposes to splash block the roof downspouts from the garages and discharge the
duplex roofs into gravel trench flow spreaders that are 24"x24"x221f long. There is 25 If of
landscaped area directly downstream of the flow spreader trenches. The sidewalk and driveways
will sheet flow offsite. The paver areas located in the middle portion of the site will be constructed
with pervious pavers. As such the site complies with the drainage manual for flow control.
PREDEVELOPED CONDITIONS
The site is currently vacant and cleared, there was an existing single family residence that has
been recently removed from the property. The remainder of the site is well established lawn with
some trees. There are no signs of flood, ponding, wetlands or other drainage issues associated
with this site. The site is accessed via Jefferson Ave SE, located along the east side of the
property. Jefferson Ave is an existing Residential Access Street with approximately 33 feet of
pavement and gravel shoulders,the existing right of way is 50 feet wide, and the existing pavement
appears to be centered in the ROW.There are no City drainage facilities in Jefferson Ave. There is
a shallow roadside swale on the west side of Jefferson Ave that flows south to north.
Highland Oasis Duplexes September 20,2015 Page 3
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Existing Soils-The King County Soils Survey Maps identify the soil types for the subject site as
AmC,Arents Alderwood with slopes from 6-15%.
DEVELOPED SITE HYDROLOGY
The project does not increase discharge more than 0.1 cfs in the post construction design therefore
the project proposes to splash block the roof down spouts from the garages and discharge the
duplexes into gravel trench flow spreaders. The sidewalk and driveways will sheet flow offsite.
Table 3.1 Threshold Discharge Area
(All Areas Measured in Acres) lefferson Ave Onsite
Total Non-Pollution Generating p 099 0.096
Impervious Surface (NPGIS)
Total Pollution Generating Impervious
SurFace(PGIS) (0.084) 0.0147
Total Pollution Generating Pervious
Surface (PGPS) 0.00 0.00
Native Vegetation Converted to 0.015 0.1374
Lawn/Landscape
Native Vegetation Not Converted 0.00 0.00
Total Effective Impervious Surface 0.015 0.11
Discharge Point JeAve�n Alley to West
KCRTS Software Inputs
Areas Acres
Predeveloped (forested Scenario)
Pervious area (Till Forest): 0.257
Developed Scenario
Till Pasture (with amended soils) 0.137
Impervious area 0.12
Figure 1. Site Location
Figure 2. Drainage Basins and Site Characteristics
Figure 3. Soils
(See next pages for each of the above figures.)
Highland Oasis Duplexes September 20,2015 Page 4
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LEGAL DESCRIPTION
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PLAT THEREOF RECORDED IN VOLUME 57 OF PLATS, PAGES 92-98,
RECORDS OF KING COUNTY, WA.
SITUATE IN THE CITY OF RENTON, COUNTY OF KING, STATE OF
WASHINGTON.
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MAP LEGEND MAP INFORMATION
Area of Interest(AOI) � Spoil Area The soil surveys that comprise your AOI were mapped at 1:24,000.
Area of Interest(AOI) O Stony Spot
Soiis Warning:Soil Map may not be valid at this scale.
Very Stony Spot
Soii Map unit Polygons Enlargement of maps beyond the scale of mapping can cause
u wet Spot misunderstanding of the detail of mapping and accuracy of soil line
r.. Soil Map unit Lines placement.The maps do not show ihe small areas of contrasting
;•, other soils that could have been shown at a more detailed scale.
� Soil Map Unit Points
•� Special Line Features
Special Point Features Please rely on the bar scale on each map sheet for map
(, Blowout Water Features measurements.
Slreams and Canals
� Borrow Pit Source of Map: Natural Resources Conservation Service
Transportation Web Soil Survey URL: http://websoilsurvey.nres.usda.gov
� Clay Spot
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�;> Ciosed Depression � Interstate Highways Maps from the Web Soil Survey are based on the Web Mercator
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� Marsh or sw2mp . Aerial Photography
Soil Survey Area: King County Area,Washington
� nnine or quarry Survey Area Data: Version 10,Sep 30,2014
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U+S� Natural Resources Web Soil Survey 1/15/2015
Conservation Service National Cooperative Soil Survey Page 2 of 3
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Soil Map—King County Area,Washington
Map Unit Legend
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Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI �
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� Conservation Service National Cooperative Soil Survey Page 3 of 3
� •
CONDITIONS AND REQUIREMENTS SUMMARY
The City of Renton Drainage Manual has eight Core Requirements for stormwater management
and six Special Requirements. The Core Requirements are:
1. Discharge at the Natural Location
2. Offsite Analysis
3. Flow Control
4. Conveyance System
5. Erosion and Sediment Control
6. Maintenance and Operation
7. Financial Guarantees and Liability
8. Water Quality
Special Requirements:
1. Other area specific requirements
2. Flood Hazard Delineation
3. Flood Protection Facilities
4. Source Control
5. Oil Control
6. Aquifer Protection Area
Addressing these ten requirements, it is anticipated that the proposed project will have little or no
adverse effects on the downstream and surrounding hydrology. Each of the minimum
requirements is discussed below.
CORE REQ I. DISCHARGE AT NATURAL LOCATION
The natural direction of flow on the property is overland sheet flow from east to west. There are no
signs of existing drainage courses or concentrated flows either to or from this property.
CORE REQ II. OFFSITE ANALYSIS
The KCRTS analysis shows that this project does not increase stormwater release from the site by
more than 0.1 cfs during the 100-year design event therefore an offsite analysis is not required
because no likely downstream adverse impacts to stormwater are anticipated. The project is
located within an area of long established residences in all directions around the property. There is
a shallow roadside ditch along the west side of Jefferson that would intercept any runoff from the
street. This swale flows southerly along Jefferson Ave. down to NO 12'h Ave where the stormwater
system collects the stormwater.
CORE REQ III.FLOW CONTROL '
EXISTING SITE HYDROLOGY I'
The subject site consists of a single lot with a single family home located in the front portion of the
lot. There are residential lots located on the north, south and west sides of the property and
Highland Oasis Duplexes September 20,2015 Page 5
.
Jefferson Avenue NE is located on the east side of the lot. The site topography generally slopes
from the east to the west side of the site. Stormwater then flows over the surFace to the south-
west. There does not appear to be any ravines,wetlands or other critical areas on the site.
That attached soils report revealed soils below 18"of depth had limited infiltration charecteristics.
The project does not appear to be located in an aquifer recharge area or welihead protection area
as defined by the King County Health Department,the EPA or by the city. There are no known
basin plans for the area.
DEVELOPED SITE HYDROLOGY, PERFORMANCE STANDARDS & I
FLOW CONTROL SYSTEM
DEVELOPED SITE HYDROLOGY
The project does not increase discharge more than 0.1 cfs in the post construction design therefore
the project proposes to splash block the roof down spouts from the garages and discharge the
duplexes into gravel trench flow spreaders that are 24"x24"x221f long. There is 25 If of landscaped
area directly downstream of the flow spreader trenches. The sidewalk and driveways will sheet
flow offsite. The paver areas located in the middle portion of the site will be constructed with
pervious pavers. As such the site complies with the drainage manual for flow control.
Utilizing Appendix C of the 2009 King County Surface Water Design Manual for small projects
Section C.1.3.1.A.3, the required amount of impervious surtace relative to the overall site area that
must be mitigated is 10%for projects up to 11,000 sf in size, and 20%for project between 11,000
sf and 22,000 sf. The proposed project area is 11,195 sf. A weighted average for the amount over
11,000 sf was used to determine the required amount of impervious surface to mitigate. The
required amount of impervious surFace to mitigate is therefore 11,OOOsf'0.1 + 195sf'0.2 = 1,139
sf. The project proposes to mitigate the impervious area of the two main apartment structures
which are a total of 3,920 sf. Even if we were required to mitigate 20%for the whole project that
would be 2,239 sf and this project is mitigating more than that. Stormwater from the garage roofs
will discharge via downspout splash blocks and flow offsite to the west.
CORE REQ IV. CONVEYANCE SYSTEM
There are no proposed conveyance pipes for this project that required analysis and design.
CORE REQ V. EROSION AND SEDIMENT CONTROL
Since less than one acre is being disturbed as part of this project, the small site erosion control
(ESC)standards will be utilized to mitigate onsite erosion potential. A Small Site ESC Plan is
attached to this report in Appendix A. Applicable details for this project are also attached in
Appendix A.
CORE REQ VI. MAINTENANCE AND OPERATION
The Homeowner will be responsible for maintaining the flow paths and landscaping. The
Stormwater Maintenance Plan is attached in Appendix D. The maintenance plan describes
Highland Oasis Duplexes September 20,2015 Page 6
. +
maintenance and operation of the yard drains, and landscaping and how homeowners can
minimize use of hazardous household products
CORE REQ VII. FINANCIAL GUARANTEES AND
LIABILITY
Once the Engineering plans are approved, the appropriate bonds will be submitted to the City as
part of the building permit process.
CORE REQ VIII. WATER QUALITY
This project proposes 640 sf of PGIS which is less than 5,000 sf therefor this project does not
require water quality mitigation.
SPECIAL REQUIREMENTS
SPECIAL REQ I. OTHER AREA SPECIFIC
REQUIREMENTS
There are no known restrictions for this project.
SPECIAL REQ II. FLOOD HAZARD DELINEATION
There are no known flood hazards for this project.
SPECIAL REQ III. FLOOD PROTECTION FACILITIES
There are no known flood protection requirements for this project.
SPECIAL REQ IV. SOURCE CONTROL
Not applicable to this project.
SPECIAL REQ V. OIL CONTROL
Not applicable to the residential project. Detailed development plans for the site will include site
specific oil control measures if required.
Highland Oasis Duplexes September 20,2015 Page 7
,
APPENDIX A -Drainage & Erosion Control Plan ,
Highland Oasis Duplexes September 20,2015
I
HIGHLAND OASIS DUPLEXES, RENTON� WA APORTIONOFSECTION4,TOWNSHIP23N.,RANGESE.,W.M.
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APPENDIX B — Stormwater Best Management Practices
for Single Family Residential Activities Guide
Highland Oasis Duplexes May 11,2015
�
• _
• - �
lntroduction................ _..._....... ........_... .........__ . .._ . .. . ..... .__._........... ....__...1
Residential Automobile and Boat Washing..........................................................R-1
Residential Storage of Solid and Food Wastes................ ............_.....................R-2
Residendal Automobile Repair and Maintenance.. ... .................................R-3
Residential Hazardous Waste Use, Storage,and Disposal...................................R-4
Resident�al Gardening and Lawn Caze.................................................................R-S '
Residenhal Maintenance and Repairs...................................................................R-6
Resident�al Swimming Pool and Hot Tub Maintenance.......................................R-?
,
. � ":;, . � .
�
- � • - •
Th�s chapter cons�sts of a senes of informaUon sheets Gst�ng the best management prachces
(BMPs)that are required for single family residential activities in unincorporated King
County. The activity sheets in this chapter target n�pical household activities that have the
potential to pollute�tormwater, surface waters,and groundwater.
Stormwate�pollution occurs when water runs over the ground,picks up pollutants,and
washes the pollutants into surface and ground waters. Street storm drainage systems are
designed to prevent local flooding by carrying stormwater runoff to nearby streams and
rivers. These drainage systems do not remove pollutants such as mator oil or soap.
Even small amounts of commonly used household products such as motor oil, pesticides,
paint wasie, and soaps are harmFul to aquatic life. Although individual acti��ities may
appear insignificant, runoff from urban areas is now a leading cause of water pollution in
nvers, lakes,and coastal areas.
King Councy's goa) is to reduce polludon by educadng homeowners and residents to
prevent the contamination of stormwater nu�off and our streams, rivers, lakes,and
�roundwater.
January 2009 K�ng County Stormwater Polluf�on Preventron Manual
� ' �" � �a<:��`: �:.� " �;_ ��-���n. ,�. - �
b..�, ._ .. . �.���� �,.��. .�.�:� ....�<_
Residential Automobile and Boat Washir��
...
�lutomobile washing is one of the most common resident�al activities that pollutes surface w•ater.
.treams,creeks, lakes,and Puget Sound. [n addition to soap and dirt, vehicle wash uatcr car►,e•
�,il, grease, solvents, nutrients,and metals and to our local water bodies. The soaps and
�ietergents that we use to wash automobiles can be more of a pollution threat than the �nmc
��ashed offthe automobiles. Even soaps that are labeled "biodegradable," "environmentall�
triendlv" or"nonto�ic" are harmfiil to aquatic life and water qualin The "nontoxic" label s�n�pl�
itt�3n, ih� ,+���� i, I��� I���ic ti� th� u,er
. � .
I�he folloNing B'�1Ps, or equivalent measures. methods or practices
are required if you engage in automobile or boat v►�as6ing at your
home.
It is acceptable tu r�nse do�+n the bod� ut�a �ehiclelx�at Hith just �vater
v►ithout doing any washwater BMPs. The wash water is diverted from
the storm drain, i.e. wash water will infiltrate.
I f you wash your automobile or baat using mild detergents(pH neutral) I
��n an area that allows for infiltration of the wash water, such as gravel,
��rass,or loose soil, it is acceptabie to let the wash water infiltrate as
I��ng as you only wash the bod�� of the vehicie(i.e. not the undercarriage
�>r �n�;�ne►
1 f�ou �4�ash ��n a pa��ed area ,uc:h a� ��c�ur dr»�e���a�� and use soap, ur
��ther cleansers,you should do C)NE of the follo�in�
• Redirect the wash water to vegetated areas such as landscapin� c�r
�our lawn This can be accomplished b� using temporary measure�
�uch as a berm,boom;scxks,or other solid materials like a piece of
lumber placed at the low� point of where your vehicle is parked Th��
��ill direct the flow of water to your lawn or landscaping.
• t se a wet �•acuum to collect the wash water and then disp��sc uf the
��ash water to �our sink or toilet for treatment ai ��our local se��age
treatment plant
ra�;�a-� :';;r;c, Kmg County Stormwater Poltuhon Prevenhon Manual
Residentral Automob,le and Boat Washmg r�nbnued
• ' • ' • � I
T�ake��our vehicie to a commercial car w ash w here w ash «ater �,
recycled and dischazged to the sanitary sew�er This also reduces th�
amoum of water used for vehicle washin�
Use a hose noule �+ith a tn�:�rr and shut �t ��t� �1I1t11 �l�U 1C Illll II�IIIL Il
IO l'0(liZf��E µ�Blei
Ne�er clean or pressure �vash the �n�ine «r undercama�e c�f�c�ur
automobile at home. The oil, grease, and other pollutants from th�s
activih can contaminate your property, as well as groundwater such as
shallow aquifers. This is especially important in areas where wells
provide potable water. For this type of cleaning,take the vehicle to a
commercial car wash where wash water will be treated appropnately.
rhere are several waterless caz wash products on the market. These
products are designed to clean and protect your vehicle without using
water. Cloths,rags, etc. used with these products should be disposed of
as solid waste.
For . , . . . . • << , , , . . , . .. • . �.
I�c
. . . � 3�. -� ., . : .� . , �v+o�.:� .. .:a�. . _ �
�� , ` � ;.�
Residential Storage of Solid and Food Wastes
I►nproper storage uf household Karbage and other wastes can lead to a var�ety of pollutants in
titorm water runoff. Waste such as leaking garbage cans, yazd waste containers without lids,
�crap piles,and junk vehicles and equipment can cause polluted runoff from your property to
drain to surt'ace and groundwater. Contaminants such as oils, greases,nutrients,bacteria,
pathogens, and suspended solids are carried to our creeks, streams, lakes,rivers,and Puget
tiuund
- � -
1 he folloHin� 6�1P�, i►r eyui�alent mea�ure�, method�, or pr.ictice�
are reyuireci in srorage of solid and tood wastes at yuur home.
[�ispose of unwanted garbage or scrap in your regular garbage service
p�ckup containers, or dispose of garbage and scrap at a landfill or
transfer station. Do not let garbage accumulate at your residence. The
.iccumulat�on of garbage is a surface waier concern and a health �ssue.
'�ccumulated garbage can attract rodents, rats,mosquitces, and other
��rsts that are also health hazards.
Waste stored outside should be kept in covered containers or be covered
��ith a tarp .All ���aste containers that are outdoors should ha�e lids.
• - • � • � �
Recycle as much as possible. Someone else may be able to use leftover
paints, fin�shes, cleaning matenals, buildin� matenals,etc. Contact a
neighbor, fnend, school, church, or communit� group to see �f your left
��ver matenals can be used. The King County Indusmal Matenals
Fxchange(IMEX) is a good resource for finding uses for your left over
matenals. Call IMEX at 206-296-4899 or send an e-mail to
imex��Dkingcounty.�ov. Consult the IMEX Web site for more
�nformation, at http:'!www.govlink orgr'hazwaste/business/imex.
-1nc�ther recycGng resource is the Kin� Counh Online Matenals
I��change a� http �'��our kinga�unt� gov�solidwaste;�elchan�e%
January 2009 King Counry Stormwater Pofluhon Preventron Manual
Res�Oenhaf Storage ol Solid and Food Wastes (contrnuedl
�l he f�in� Cuunt� S�lid Waste Unision pro�ides waste d�sposal ancl
recycling information at
http://your.kingcounty.gov/solidwaste/index.asp. Informat��>n r«ard�n�
proper household hazardous waste disposal is available at
http://www.govlink.org/hazwaste/house,or contact the Nazar�i, l.�ne at
206-296-4b92. See Acti�•it� �hcet R-�. "Residenti�l Hararduu� �'�a,te
Use, Storage, and Disposal "
Compost biodegradable Ha�tr� rather than �ii�pu>in� ��f thrin a� �arbaie
Contact the King County Solid Waste Division at
http://your.kingcounty.gov/solidwaste/compostin� �nd�� a:p t��r m��rr
information on composting yard and kitchen waste
fnf�rmation on vard waste collection services is a�a�lahlr at
IIII�� �I�UI �IIIL���UIII\ L��� 1t�Ilt��\:I�IC L"i1ff��ILI-C�l�l'IIIIL ��lflj��:l�jl il��l
l)i;p�,.� u! p�t ��.i,t� in �viit �arha��. bun �t �n ���ur �ar�l ln��t in
�egetable gardens); or,dispose of m sanitary sewer systems surh ;�. ���ur
toilet. See
hit� ��ur km�rc�unt� z�� ;�,I�d��a,tc c��rnp��stm� �et��a�t� <i���
F��r mc�re tnti,rmauun or a„i�tancr �n irn��lernenuni thr�n c�yt rnan:�iement pra�ti:cy �onta�t thr hin�(oun��
UeE�anrnem�,{\atural R��,��ur:�,_in�1 Per�., Al_u�r an�i I an,l ftc-,��ur�e� I)��,i,i�m .it '_ur,-��,�,_t�h�u
�,nq �o,:nfy Stor•nwafe� �o;lafror P�_r';����t. �'.4an.:a� _�a^LBN_=?�1
�
Residential Automobile Repair and Maintenance
Many people prefer to repair and maintain their vehicles at home. Those that do need to ensure
that these activities do not pollute our streams,rivers,and lakes. Automobile maintenance and
repair activities can introduce chemicals such as oil, grease, antifreeu, hydraulic and brake
Fluids, and metals to our surface and groundwater. A recent study estimated that the amount �f
oil running off our streets and dnveways and ultimateh• flow�ing into the oceans is equal to an
Exxon Valdez oil spill - 10 9 million gallons - even e��h► munth� I tiRC. '(�+��i
. � .
The following best management practices (B11Ps)or equival�•���
measures, methods,or practices are required if you engage i
automobile repair and maintenance at your home.
Collect all used oil,ant�freeze, or other �ehicle flu�ds in containers with
ti�ht fitt�ng lids. Do not mix these fluids in the same container as this
lim�ts your abiliry to recycle the oil at your local auto parts store or
service station.
tiever dispose of used oil, antifreeze,or other flu�ds into a storm drain
into a ditch,or onto the L:round. Oil should be recvcled at an auto part•
store or sen�ice station. Other fluids can be disposed of at a h�ncehnlc+
hazardous waste collection site. Call the household haza�
at 206-296-4692 or see
http:r'/www.govlink.or�,mazwaste'h��
and disposal �nformation and locat��
Never clean the engine or undercarr�ar� ,�i �„s.�� ,��u�i� �; i���u��
this t��pe of cleaning,take the veh�cle to a commercial car wash fac�„
(;se dnp pans, tarps,or even cardboard and newspaper under the vehit'
to capture leal:s or spills that mav occur dunng maintenance and - �
dCtlVlh�� Tl�i: ;•n:,i���. :nil�,_'�� fl�;irj� �.�,,t,'? f.0 �ti`?�fl�'�1 ��, rl,�� :f
draina���
Res�dent�al Automob�le Repair and Mamtenance (cont�nued!
Clean up spills with rags or absorbent material, such as sand,dirt, or cat
litter. Do not wash down or hose down these spilis to the curbs,
roadway>or storm drains. Sweep up absorbents and dispose of them in
<<�ur �arbaKe can
Store automot�ve parts, such as battene�, engines, transmissions, and
other parts that ma� ha�•e oily or greasy residue on them, under cover
and off the ground to minimize rai�water contact. Rainwater can wash
poliutants off these parts and send pollutants to storm drainage systems
and groundwater Tarps are an ine�pensive and easy solution to
��111[Itl!' (l�fl�
• ' 1 ' I ' I
I ak� �our �ehicle to a cummerc►al car repair facilit} where fluids are
handled, recycled and disposed of correctl�• to avoid pollutants being
introduced to our local water bodies. The En��roStars E'ro�ram certifies
husinesses for reducin�, rec��cling, and properly managing haiardous
�+aste. See http:;iw�►w.envirostars.com/ to search for businesses that
!i.��c earned !he F�n�ir���tar� rahn��
I c,r more infc�r��auon c�r:is��;tanre m implementmc thc�e hcst manaLement practices contact the Kmi ('ount�
�)i���,lii�i:c � , 1 \,; .. ,. t::�., ,u��• .s�,il I'.:�F,, l\.1'i' ,f'i,'� � .ti : k�'.,,.�'.c`� �),.i ., , :�, _� r,_,,�.._I , ��
e� ,1 ����"����.� } �
Residential Hazardous Waste Use, Storage, and Di sposal
There aze a variety of'hazardous matenals routinel� used in and around our hames including
chemical cleaners, pestic�des,paints, solvents, lighter fluid, gasoline, antifreeze, brake fluid and
other automotive products, wood presen•atives and even batteries from our electronic equipment
Improper disposal and failure to keep hazardous products from rainwater contact may cause
surface and groundwater poliution. With so many hazardous compounds present in thousands uf
households in King County,the cumulative adverse effects of poor usa�e, stora�e and disposal
practices are potentiallv se�ere to our em�ironmental health
. � .
The followin� best management practices (B!�iPs) or equivalent I
measures, methods,or practices are required when using or storing I
hazardous wastes at your home. ��
Store all hazardous materials inside a bu�idin � or shed or under cover.
�
tk�not expose hazardous materials ro rainwater that can transport
harardc�u,pol(utants ta surface and groundwater
l.lse products unl� as spec�tied un labelin� due�ti�m�.
U�spou: of and rec�cle hazardous �+astes thruu�h the Huuu�hold
Hazardous Waste Program or other recyclin�programs or businesses, or
carefully follow disposal directians on containers of chemicals. There
are three fixed ha�ardous waste collection sites for household hazardaus
wasie in Seattle and King Count}•. In addition, the Wastemobile travels
to �ifferent areas of K�ng Count�� throughout the year. See
http �wu�.go��link.or�fiazvr�aste�'house or call the Household Hazards
Li��e at '(lh-?9fi-1692 for mure information
Never allow hazardous chem�cals to be discharged or dumped mto storm
draina�e systems or on to the gr�und.
Januery?009 King County Storrnwafsr Polkition Prevention Manusl
Res,dentia!Hazardous Waste Use Storage and D�sposa�;"conhr,uedl
• ' • ' • � 1 '
Reuse a��d recycle as rziuch as possible. Somec�ne else may be able to use
leftover paints, finishes, cleaning materials, building matenals,etc.
Contact a neighbor, friend, school,church,or community group to see if
�our left over materials can be used. The King Counry lndustrial
'viaterials Exchange(IMEX) is a good resource for finding uses for your
left over matenals. Call IMEX at 206-296-4899 or send an e-mail to
�mex�kingcounty.�ov. Consult the IMEX Web site for more
information, at http: :`�+r�;ti� go�lin{:.org:1�az�vastebusiness�ime�
l�se the least tox�c praduct a�ailable See
tittp:iJwww.govlink.or�r'hazwaster'houseialternaUves for �nf�nnatiun �n
findinr� alternahves to hazardous household pr�ducts
f�,r iniire <nli,rmat�un �n :n,i,tan�r in �m��lenuntiri thr,e hctit niana�rnirnt pract��r, �untac� the hinc l ,�unt�
ll��ur,mert�,t \:iu.r.il Rr,��urre�:uu� Pa��,> 1latrr :�nd I :�n.l Rcw��urc� I)i�i.i�m a� ��-:t,_,�>r•-I'r�,
- n , „ ..�. .,•,• r,,;- . -,,7n•_
.. j �._,� .r,`l•n,..1;d•P, n.ilUlO .PVB, t,•� n.A3 . d: �d^L'B^y _ � J
# -
Residential Gardening and Lawn Care
Many �Ilutants can enter stormwater systems, groundwater, and water bodies as a result of
t�pical lawn and gardening work. Runoff that is contaminated by pesticides and fertilizers can
�everely degrade receiving waters and result in ad��erse effects on fish and other aquatic life.
Recent studies in the Puget Sound re�ion detected pesticides in urban streams at levels that
�xceed limits set to protect aquatic life. Some gardening chemicals are also harmful to children
and pets. Fertilizers add nutrients to water bodies causing unwanted algal blooms and other
aquatic plant growrth. Disposal of grass clippings and other vegetation into storm drains,
�tormwater ponds, roadside ditches and other water bodies can lead to decreased oxygen le��els
m stormwater as the vegetahon decomposes. Decreased oxygen levels can be lethal to fish and
z�ther aquatic life. Several simple practices can be used to prevent these problems, and may result
in improved lawn and garden quality. These practices should also be shared with private
landscapers that conduct gardening and lawn caze on your property.
Vote The term �esticide includes insecticides, herbicides, fungicides, rodenticides, etc.
. �
The following BMPs.or equi��alent measures, methods,or practices,
are required if you are engaged in gardening and lawn care at your
home:
tiever appl� herbicide;. insertic�des. r��denhc�des, nr f�un�;icides aloni
the banks of strea�n and drainage channels with flc�w•ing water, or along
the shores of lakes and wetlands. Never apply these chemicals when rt is
raining.
Manually or mechanicallv remove weeds and other pests rather than
using �e�l�cide. in area� ��f�ninnine <�r s�at�din� ��ater
titc�r�: �I) ha�s ��r pile� ��f fertilizrrs and cunta�ners uf�pcs�iride� in a
co�ered locat�on such as a garden shed.
Oo not s�eep or dump �,nass clipp�ngs, leaves, or h;�igs into an�� street,
drainage ditch, or stormwater facility or pond.
.ianuary 2uf19 K�ng Coun!y Sro�mwate�Po�tutron Preventor? h4anual
Residentra!Garden�ng and Lawc carn icontrnued;
Sture pile� ot�beaut� t�ark and other erodible matenals im la�tins or other
pervious areas. lf these matenals are stored on impervious areas such as
driveways,cover them with a tarp so that rainwater does not wash the
materials into st�rm drains ar ditches.
• • - • � �
Purchase and use the least amount of pesticides necessan and always
f'ollow the label directions for appl�cation. Tn pest c�ntrol measures
that do not require chemicals first. See
http:r'www.govlink.org/hazwaste.-'house'��ard;pmblems t���r inforn�at�on
on how to reduce or avoid the use of pesticides
Compost your yard wastes,or use yard waste as mulch in your yard c�r
garden. Contact your local solid waste utility to see if yard waste p�ckuF�
service is availabie. See http "�our kinicountv.gav�'solidwaste'garba��-
recyclin�'yardw�aste.asF� f�u n���r� n�f�,nnati��r ��n �ar�i �+�t;te c��llecnc�n
an�1 r���rl�iiL :�r�i����
f�clur,it� ����u�,�11�,�h��u1 alternati��, t�� �h�ini���l E>csti�icl« anc� 1���1�li�cr,
such as intel;rated pest mana�ement techniques. Contact the Local
Hazardous Waste Management Program at ?OG-2�h--�1,9'. <,r �„��
http:�`:�w��w.govlink.or�mazwaste�'housei�arci
Limit the amount of lawn and�arden watenn�; �u that �urTa�c: runut�l
dces not leave your property. Check automatic sprinkler systems to
ensure water is dispersed to landscaped areas and not to hard surfa«�
such as drivewavs and sidewalks that dr�3in t�� :t��rm �iriin:i�� .�,teni�
Avoid planting species on the Noxious ������1� I�.i F��r a..�,t<�n«� ��r
questions c��ntact the Nr���<�u� �'�'�ed �e���,�r� ��t �1 I I��� ,�i
'�fi-��f,-1�)i��.
f��€ [31c�(l uliUittl:it:utl u; .1»t�l.1I��.0 �I� ;itl�'.C1LC!lil: � i:iC]C� Cwl !i:31��i,1���.1.:-!I ��t:i�ll�t;� �.Rlld�i IY.c' h'i _ ( � �i`I?=
Department of Natural Resources and Parks 11�`ater arxi Land Resources Un�ision at 2()b-�5�6-1�_�
Reader Note The above requirements are the minimum r�uired H!�1Ps tf these B?�iPs faii to prc.�u: ..i;,���.: _. ;,
thestorm. ..i t...r•, -1r'�. . 'q'.. .. , t.ii ,..! ? ? . ',t.,.. u�� t � 'r�' ,�1� .,,��' i;;�J C`� i�.ti, t'.
d�;ihar:�c•
x l.y ,..�:: i.y_ �tGrl�n.4di2r t'"ll'U!rG'�7,�-�.�P.'B+',un ,FtA2�i�:3 .,81;c-d y ���-!`4
��
Residential Maintenance and Repairs ;
There are a varieh� of home maintenance and repa�r act��ities routinel� cacned out by
homeowners in King County that have the potential to adversely affect our streams, rivers, and
lakes. Pollutants generated from these activities can affect whether a lake or water body is
swimmable or fishable. Painting,pressure washing,carpet cleaning,moss control, and concrete
repair and maintenance are a few examples of acdvities homeowners eonduct that can result in
pollutants being discharged to drainage systems, surface water,and ground w�ater. Wash water
from these activities contain chemicals,suspended solids,organic compounds,detergents,
solvents, abnormal pH, and other toxins that have a detrimental and toxic effect on fish and other
aquatic life.
- � -
"I'he followin� B11Ps,or equivalent measures, methods or practices
are required when conducting residential maintenance and repairs at
vour horoe.
Do not dispose of an�� wastew�ater inro the street, �utter, storm drain, or
draina�e ditch, or mt�,a stream. creek. or other bc3dy c�f�tiater.
PAl?�IT1tiG I)c� n��t dispuse of��ash ���ater trom cleanin� brushes, paint
rollers, paint buckets, or conta�ners to surface water, storm drains, or
ditches. Vdash water from latex paints can be disposed of to the sanitary
sewer. Empt��containers of latex paint can be left open to dry aut any
residual paint, and then disposed of in your normal garbage or taken to a
transfer station for disposal. Residual oil based paint,paint thinners,and
solvents must be disposed of as hazardous waste.
See http:��w���.�ovlink.org�haz�i�aste.�'house/productsilist cfm and
http:;/w�tiv g�vlink,or�;'hazwasteipublications/Paint CommonWastes.pdf
for informatic�n an the proper disposal of paint and solvent waste.
PRESSURE WASNING: Vdater from pressure washing decks,driveways,
roofs,or other hard surfaces ma} contain suspended solids and other
pc�llutants that should not be d�rectly discharged to drainage systems.
Red�rect pressure washing wastewater to vegetated areas or areas such �s
�;ravel, lawns, landscaping, or bare soil where the water will infiltrate
slowly into the ground. If this cannot be accomplished, filter the wash
water through filter fabric,or other filtering media to collect the
suspended sohds before discharging the water to a drainage s}�stem. lf any
January?009 K�ng CourMy Srom►water Polk»tion Prever►tion Manual
. �
Resxlentie!Ma,ntenance and Repalrs(continued)
chem�cals are used dunng the pressure washing process, the wastewater
must be collected and disposed of in a sanitary sewer system or infiltrated
on site. lf moss control or another chemical treatment is used during
pressure washing of roofs, disconnect the downspouts so the chemicals �c�
not dischazge to the storm drainage s}st�►r�. and disper�e th< «ash ��z�ter
�nto adjacent lawns and landscapinL
CARPET CLEANING: Most commerc�al carpet cleaners have onbuard
wastewater recycling systems. If you do your own carpet cleaning, the
wash water must be discharged to the sanitary sewer or your septic
system. Filter the water if it contains lint or other particles to avoid
clogging the drains. If you prefer not to discharge the water to your s�pt��
system,you may also discharge the w•ater to your lawn or a landscapeci
area to allow the washwater to infiltrate slowly into the ground. Be a�ar�
that detergents and other cleaning chemicals sucb as solvents can be
harmfu) to vegetation and septic systems. Discharging wash water to th�
ground may not be allowed if you live in a Critical Aquifer Recharge
Area(CARA). Never dispose of carpet cleaning wash water to a storn�
drain, drainage ditch, ar surface water. Carpet cleaning wastewater
contains chemicals,detergents,and suspended ���i�c1� that �i�i��r��l�
impact the quality of surface and ground water�
CEMENT/CONCRETE WORK: Concreteicement wash water tias a pf i
level that is toxic to aquatic life. Do not a11ow wash water from concrete
work to discharge into storm drainage systems, including small yard
clrains or adjacent roadways. This is especially important when installin�
washed aggregate driveways or pat�os. Direct the wash water to vegetated
areas or dig a hole where the wash water can settle and infiltrate slowl�
into the ground. The cement residue can be mixed into the soil where the
��ash �iater is infiltrated ���ith no detrimental effects. and the pH uill tk
n�utr�il�r_��1
� • • - • � s
Hire a proiessional h��rne mamtenanc� an�l reE�air ���t>>pan� that ��ull�»ti�
the approved BMPs for h�me r�pair and ma�ntena��ce, as adopted by ��n��
County If you have questions about which Best Mana�ement Practice� ��
business must comply with contact King Cauntt� Water and Lanci
Resources at 206-296-1900 or see
http:/�www.kingcounty.govtenvironmentiwaterandland/srormwat�r <�,���
Remember. as a homeowner. you ha��e a responsibility to ensure v��u�
contractors follow the requ�red Best Management Practices. As pan ,}1
�our a�reement with cc�ntractors. require them to follow al) Kin�� t_ ,�u��t�
C����1�� .tnt; r�s�til,ili��n�
K 'y _ � , +�td`_ , n,f., �Pve'. , Ib1r�r.,a .3•^Jd�y��J9
y
Residential Swimming Pool and Hot Tub Maintenance
Many residents in King County have swimming pools, spas,or hot tubs. Improper dramage or
discharge of pool water to storm drains or ditches during maintenance activities can lead to
nutnents,suspended solids,chlonne,abnormal pH, and other chemicals entenng our streams,
nvers,and lakes. Chemicals used in pool, spa,and hot tub maintenance can contaminate
:tc�rm��ater and �urface water if they are not stored. used, and disposed �f correctiv
�
I he folle�Hin� B\iPs, or eyui�alent measures, method, or practice�
are required when drainin�or maintaining your pool, spa� or hot
tu b.
Dechlorinate pool, hot tub, and spa water if it �s to be discharged to the
�round. Neutralizing chemicals are available. Letting the pool, hot tub,
��r spa"sit"with no chemicals may reduce chlonne levels. State law
<�llows discharFes of pool water to the ground if the chlonne level is
t�elow 3 ppm (parts per million). The pool water must be dra�ned to the
Lround in a manner so that it dces not cross property l�nes or cause
�rosion problems. Never discharge pool water directly to stortn drains or
d�tches.
If pool or spa water cannot be dechlorinated, the water m�st be drained
to the sanitary sewer or collected by a pool maintenance company for
��ff-s►te dispo�al
Uiatumaceuus earth (c��mmcml� u,�� a, a tilt�nn� agentl and ��ater
trom backtlushing filter systems ca��not be discharged ta surf�ace ��aters.
stunn drainage systems, septic s`�stems, or the ��round
Pool water that has been treated ��ith c����er ha:�d al�acr��e� rna� n��t
he discharced t� the Lro�m�1
,;anua.ry 2DC19 K,nq�ounty Srormwafer Pollut,on ��pvent�on Manuat
, �
Residentiaf Srwmmin9 Pool and Fbt Tub Maintenance(continuedJ
• ' 1 ' • � • •
Hire a professionai pool maintenance company to senice ��our pool, hot
tub or spa.
For more mformauon or assistan:e in implemenun�;these best management practices.contac-t the f�ine (`ount�
Department ot'�atural Re,.�sources and Parl.��1�atrr and land R��ources Di�isiun:�t '_��6-'�ii�-I�xx�
__�. , ,. '.ta'P' , �.'iG" 'e4E"��,r, r,dd".:a ;i".;e . .00y
APPENDIX C — Residential Declaration of Covenants
Highland Oasis Duplexes May 11,2015
City of Renton Page 1 of 2
MAINTENANCE AND DEFECT AGREEMENT(Two Years) Applicant's Name and Address
For public roads and drainage facilities
Agreement Number Project Number and Name
Guarantee Amount Site Location/Section
This AGREEMENT is made and entered into this day of , 19_, between the City of Renton,
hereinafter called the CITY, and the above named APPLICANT, hereinafter called APPLICANT.
Basis For AGREEMENT:
WHEREAS the undersigned APPLICANT has constructed public roads and/or drainage facilities in connection
with the above-referenced project; and
WHEREAS the APPLICANT has agreed to secure the successful maintenance and operation of said
improvements for the referenced projects pursuant to RMC 4-6-030
NOW THEREFORE, the APPLICANT hereby agrees and binds itself and its legal representatives, successors, and
assigns as follows:
Terms of the AGREEMENT:
1. The improvements constructed by the APPLICANT or his representative shall successfully operate and shall
remain free of defects in design, workmanship, materials, and design for a period of two years from the date
of satisfactory completion of the improvements or final plat approval, whichever is later. As used in this
AGREEMENT, the term "defects" includes but is not limited to, damage resulting from construction activities
and/or use during the two year period.
2. The APPLICANT is responsible for maintenance of the public road and drainage facilities, including the
roadway surface for the two year period from the date of satisfactory construction approval or final plat
approval, whichever is later.
3. In the event of any failure of the improvements to satisfactorily operate or in the event of a defect in design,
workmanship or materials, the APPLICANT shall promptly and adequately repair and/or correct the failure or
defect.
4. The CITY will perForm maintenance inspections during the two year period.
5. During the two year period upon notification by the CITY, the APPLICANT shall correct and/or make repairs to
the right-of-way improvements within the time period specified by the CITY when defects in the design,
workmanship, or materials occur.
6. In the event the CITY determines that repairs must be performed immediately to prevent risk to person(s) and
property, the CITY may make necessary repairs and the costs of those repairs shall be paid by the APPLICANT
upon demand.
7. The APPLICANT shall pay all required fees in accordance with Renton Municipal Code.
8. At the end of the two year period, the APPLICANT shall clean the drainage system prior to the CITY's final
inspection.
City of Renton Page 2 �f 2
Agreement Number Project Number and Name
9. If, at the conclusion of the two year period, the City of Renton, at its sole discretion, determines that the
improvements are not adequately maintained, the APPLICANT shall perForm prompt maintenance to the
CITY's satisfaction. In the event this maintenance is not performed within the time period specified by the CITY,
the CITY will invoke the enforcement processes found in RMC 1-3.
10. Any failure by the APPLICANT to comply with the terms of this AGREEMENT in a timely manner shall constitute
default. Any action or inaction by the City of Renton following any default in any term or condition of this
AGREEMENT shall not be deemed to waive any rights of the City of Renton pursuant to this AGREEMENT.
11. The APPLICANT shall indemnify and hold the CITY and its agents, employees and/or officers harmless from and
shall process and defend at its own expense all claims, damages, suits at law or equity, actions, penalties,
losses, or costs of whatsoever kind or nature, brought against the CITY arising out of, in connection with, or
incident to the execution of this AGREEMENT and/or the APPLICANT's performance or failure to perform any
aspect of the AGREEMENT. Provided, however, that if such claims are caused by or result from concurrent
negligence of the APPLICANT and the CITY, its agents, employees and/or officers, this provision shall be valid
and enforceabie only to the extent of the negligence of the APPLICANT, and provided further, that nothing
herein shall require the APPLICANT to hold harmless or defend the CITY from any claim arising from the sole
negligence of the CITY's agents, employees and/or officers.
12. In the event that any party deems it necessary to institute legal action or proceedings to enforce any right or
obligation under this AGREEMENT, the parties hereto agree that any such action or proceeding shall be
brought in a court of competent jurisdiction situated in King County, Washington.
Release Requirements: This AGREEMENT shall remain in full force and effect and shall not be released until all
terms of this AGREEMENT have been completed to the satisfaction of the City of Renton.
IN WITNESS THEREOF,the parties hereto have executed this AGREEMENT as of the day and year first above written.
APPLICANT
By Title Date ,
Received for City of Renton By Date '
,;s;zo,o �
Return Address:
City Clerk's Office
City of Renton
1055 S Grady Way
Renton,WA 98057
DECLARATION OF COVENANT FOR INSPECTION AND
MAINTENANCE OF STORMWATER FACILITIES AND BMPS
Grantor:
Grantee: City of Renton
Legal Description:
Assessor's Tax Parcel ID#: I
IN CONSIDERATION of the approved City of Renton permit
for application file No. LL"A/SWP relating to the real property("Property")
described above,the Grantor(s),the owner(s)in fee of that Property,hereby covenants(covenant)with the
Ciry of Renton,a political subdivision of the state of Washington,that he/she(they)will observe, consent
to,and abide by the conditions and obligations set forth and described in Paragraphs 1 through 10 below
with regard to the Property,and hereby grants(grant)an easement as described in Paragraphs 2 and 3.
Grantor(s)hereby grants(grant),covenants(covenant),and agrees(agree)as follows:
1. The Grantor(s)or his/her(their)successors in interest and assigns ("Owners of the described
property")shall at their own cost,operate,maintain,and keep in good repair,the Property's stormwater
facilities and/or best management practices('BMPs") constructed as required in the approved
construction plans and specifications on file with the Ciry of Renton and submitted to the
City of Renton for the review and approval of pernut(s) . The
property's stormwater facilities and/or best management practices("BMPs") are shown and/or listed on
Exhibit A. The property's stormwater facilities and/or BMPs shall be maintained in compliance with the
operation and maintenance schedule included and attached herein as Exhibit B. Stormwater facilities
include pipes, swales,tanks,vaults,ponds,and other engineered structures designed to manage and/or
treat stormwater on the Property. Stormwater BMPs include dispersion and infiltration devices,native
vegetated areas,permeable pavements, vegetated roofs,rainwater harvesting systems,reduced impervious
surface coverage,and other measures designed to reduce the amount of stormwater runoff on the
Property.
2. City of Renton shall have the right to ingress and egress over those portions of the Property
necessary to perform inspections of the stormwater facilities and BMPs and conduct maintenance
activities specified in this Declaration of Covenant and in accordance with RMC 4-6-030.
3. If City of Renton determines that maintenance or repair work is required to be done to any of
the stormwater facilities or BMPs,City of Renton shall give notice of the specific maintenance and/or
repair work required pursuant to RMC 4-6-030. The City shall also set a reasonable time in which such
Page 1 of 3 Form Approved by City Attorney 10'2013
' . I�
work is to be completed by the Owners. If the above required maintenance or repair is not completed
within the time set by the City,the City may perform the required maintenance or repair,and hereby is
given access to the Property, subject to the exclusion in Paragraph 2 above, for such purposes. Written
notice will be sent to the Owners stating the City's intention to perform such work. This work will not
commence until at least seven(7)days after such notice is mailed. If,within the sole discretion of the
City,there exists an imminent or present danger,the seven(7)day notice period will be waived and
maintenance and/or repair wark will begin immediately.
4. If at any time the City of Renton reasonably deternunes that a stormwater facility or BMP on
the Property creates any of the hazardous conditions listed in RMC 4-4-060 G or relevant municipal
successar's codes as applicable and herein incorporated by reference,the Ciry may take measures
specified therein.
5. The Owners shall assume all responsibility far the cost of any maintenance or repair work
completed by the City as described in Paragraph 3 or any measures taken by the City to address hazardous
conditions as described in Paragraph 4. Such responsibility shall include reimbursement to the City
within thirty(30)days of the receipt of the invoice for any such work performed. Overdue payments will
require payment of interest at the current legal rate as liquidated damages. If legal action ensues, the
prevailing party is entitled to recover reasonable litigation costs and attorney's fees.
6. The Owners are hereby required to obtain written approval from City of Renton prior to
filling,piping,cutting,or removing vegetation(except in routine landscape maintenance) in open
vegetated stormwater facilities(such as swales,channels,ditches,ponds,etc.), or performing any
alterations or modifications to the stormwater facilities and BMPs referenced in this Declaration of
Covenant.
7. Any notice or consent required to be given or otherwise provided for by the provisions of this
Agreement shall be effective upon personal delivery, or three(3)days after mailing by Certified Mail,
return receipt requested.
8. With regard to the matters addressed herein,this agreement constitutes the entire agreement
between the parties,and supersedes all prior discussions,negotiations, and all agreements whatsoever
whether oral or written.
9. This Declaration of Covenant is intended to protect the value and desirability of the real
property described above,and shall inure to the benefit of all the citizens of the City of Renton and its
successors and assigns. This Declaration of Covenant shall run with the land and be binding upon
Grantor(s),and Grantor's(s')successors in interest,and assigns.
10. This Declaration of Covenant may be ternunated by execution of a written ageement by the
Owners and the Ciry that is recorded by King County in its real property records.
IN WITNESS WHEREOF,this Declaration of Covenant for the Inspection and Maintenance of
Stormwater Facilities and BMPs is executed this day of , 20
GRANTOR,owner of the Property
GRANTOR,owner of the Property
Page 2 of 3 Form Appro�-ed by City Attorney 10;'2013
STATE OF WASHINGTON )
COLJNTY OF KING )ss.
On this day personally appeared before me:
,to me known to be the individual(s) described in
and who executed tbe within and foregoing instrument and acknowledged that they signed the same as
their free and voluntary act and deed,for the uses and purposes therein stated.
Given under my hand and official seal this day of ,20
Printed name
Notarv Public in and for the State of Washingto�
�1� ;i4��,,,,rin�.ii! :���:r�, __
Page 3 of 3 Form.Approved by City Attorney 10!?O l3
APPENDIX D — Stormwater Maintenance Plan
Highland Oasis Duplexes May 11,2015
HOMEOWNER'S STORMWATER MAINTENANCE PLAN
of
HIGHLAND OASIS DUPLEXES
1419 Jefferson Avenue NE
Renton, WA
for
Andrew Wang
12419 NE 140`h Street
Kirkland, WA 98034
bv
THE LAND DEVELOPER'S
ENGINEERED SOLUTION
A Division of THE LAND DEVELOPER. LLC
Erik B. Ainsworth, Pl�.
PO Box 4420
Tumwater, WA 9R���I
(_;(,(1) ��n-��>��
January 15, 2015
TABLE OF CONTENTS I,
I. STORMWATER MAINTENANCE PLAN .................................................... 3 �
II. Best Management Practices for Single-Family Residence ................. 12 ,
I. STORMWATER MAINTENANCE PLAN
TABLE OF CONTENTS
I. STORMWATER FACILITY MAINTENANCE GUIDE.........................5
Introduction...........................................................................................................................5
What Is Stormwater Runoff?....................................................................................5
What Is a Storm Drain System and How Does It Work?.........................................�
What Does Stormwater Runoff Have to Do With Water Quality?............................�
StormwaterFacilities................................................................................................�
Who Is Responsible for Maintaining Stormwater Facilities?....................................:
How to Use the Stormwater Facility Maintenance Guide?......................................E
Includedin This Guide.............................................................................................E
Your Stormwater Facilities....................................................................................................E
FacilityKey............................................................................................................................E i
Site Plan.................................................................................. ................7
..............................
QuickList..............................................................................................................................8
Maintenance Checklists........................................................................................................9
ResourceListing...................................................................................................................9
LogSheet............................................................................................................................11
II. Best Management Practices for Single Family Residence .........12
I. STORMWATER FACILITY MAINTENANCE GUIDE ''
Introduction
What Is Stormwater Runoff?
When urban and suburban development covers the land with buildings, streets and parking lots,
much of the native topsoil, duff, trees, shrubs and grass are replaced by asphalt and concrete.
Rainfall that would have soaked directly into the ground instead stays on the surface as stormwater
runoff making its way into storm drains (including man-made pipes, ditches or swale networks),
stormwater ponds, surface and groundwater and, eventually, to Puget Sound.
What Is a Storm Drain System and How Does It Work?
The storm drain system for most developments includes measures to carry, store, cleanse and
release the stormwater. Components work together to reduce the impacts of development on the
environment. Impacts can include floodrng that results in property damage and blocked emergency
routes, erosion that can cause damage to salmon spawning habitat and pollution that harms fish
and/or drinking water supplies.
The storm drain system provides a safe method to carry stormwater to the treatment and storage
area. Swales and ponds filter pollutants from the stormwater by physically settling out particles,
chemically binding pollutants to pond sediments and biologicaUy converting pollutants to less
harmful compounds. Ponds also store treated water, releasing it gradually to a nearby stream or to
groundwater.
What Does Stormwater Runoff Have to Do With Water Quality?
Stormwater runoff must be treated because it carries litter, oil, gasoline, fertilizers, pesticides, pet
wastes, sediments and anything else that can float, dissolve or be swept along by moving water.
Left untreated, polluted stormwater can reach nearby waterways where it can harm and even kill
aquatic life. It can also pollute groundwater to the extent that it requires treatment before it is
suitable for drinking. Nationally, stormwater is recognized as a major threat to water quality.
Remember to keep everything out of stormwater systems except the rainwater they are designed
to collect.
What Types of Stormwater Facilities Are There?
Different types of ponds are designed for different purposes. For example, wet ponds primarily
provide treatment of stormwater. Dry ponds or infiltration ponds are designed to provide storage
for stormwater and allow for its gradual release downstream or into the ground. Roof infiltration
trenches serve in infiltrate roof runoff directly into the ground reducing offsite stormwater
discharges.
Who Is Responsible for Maintaining Stormwater Facilities?
All stormwater facilities require maintenance. Regular maintenance ensures proper functioning
and preserves visual appeal. This Stormwater Facility Maintenance Guide was designed to explain
Highland Oasis Duplexes January 15,2015 PAGE 5
how stormwater facilities work and provide user-friendly, straightforward guidance on facility
maintenance.
You are responsible for regularly maintaining privately owned ponds, catch basins, pipes and other
drainage facilities on your property. Stormwater facilities located in public rights-of-way are
maintained by local governments.
How to Use the Stormwater Facility Maintenance Guide
This Maintenance Guide includes a Site Plan specific to your development and a Facility Key that
identifies the private stormwater facilities you are responsible for maintaining. A"Quick LisY'of
maintenance activities has also been included to help you identify the more routine needs of your
facility. Also included in this guide:
• Comprehensive Maintenance Checklists that provide specific details on required
maintenance
• Pollution Prevention Tips that list ways to protect water quality and keep storm drain
systems functioning smoothly
• Resources to provide more information and technical assistance
Your Stormwater Facilities
This section consists of two parts that are to be used together: the Facility Key and the Site Plan.
Review the Site Plan and identify the numbers denoting a feature of the system. Then check the
Facility Key for the feature type and checklist name.
Facility Key
The stormwater facility in your neighborhood is composed of the following elements: I
Type of Feature&Checklist Name Lceation on Site Plan
Grounds (Landscaping) 1
Downspouts 2
Dispersed Land 3
Highland Oasis Duplexes January 15,2015 PAGE 6
I
, 19 JEFFERSON AVE., NE, RENTON, WA 98056 " . ' `" '
i..�'L��"��
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AROUND PROPF.RTY t
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6"�"(-)GRAVEL UNl7 2 1 5B ° IN SI�,OPE � �� MAIIBOXES WI 6"SIDE SEWEF2 FOR EACH
INTO EX GRAVEL DRIVE � � PARKIN �i.> Is T^eie' � f ^ p o p I DUPLEX VERIFY LOCATION,
MAX GRADE 5%(TYP) W N W 6 D�.-�. < < N I � I � DEPTH,AND CLEARANCES
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-� -. , + c Il` � I �I 5;'1 Y YD _ -,- �- �_ � � �i o LL PRIOR TO CONSTRUCTION. U:;E
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p _ i gg�"� � UNIT 3 •- --�--� g• � PERMITS PRIOR TO CONS I I�!r i b�N
-�- � � � I - �( ^� { REMOVE EX CONC SHOUI�
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(TYP ONE PER DUPLEX) IE 6"E 371 Sb
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METER ASSEMBLY FOR EACH �I� '� 1 °£ ..
UNIT REQUIRES CONNECTION � 50 L F LONG x a :',i,n
PERMIT INSTALLAT�ION PER � � �'AIN I t f�Fn<;t u��i
CITV DETAIL 320.1 � I i�:���; �n�'[1:
Quick List
The following is an abbreviated checklist of the most common types of maintenance required.
Please go over this checklist after hea�y rains. The list represents minimum maintenance to be
performed and should be completed in conjunction with the other checklists for an effective
maintenance program.
❑ Inspect catch basin grates to see that they are not clogged or broken. Remove twigs,
leaves or other blockages.
❑ Inspect inlet and outlet pipes for blockages. Clear all blockages.
❑ Inspect Amended soil area and infiltration trench cleanouts.
Highland Oasis Duplexes January 15,2015 PAGE 8
Maintenance Checklists
The Maintenance Checklists in this packet are for your use when inspecting the stormwater
facilities on your property. This packet has been customized so that only the checklists for your
facilities are included. If you feel you are missing a checklist, or you have additional facilities not
identified or addressed in this packet, please contact your local jurisdiction.
The checklists are in tabular format for ease of use. Each describes the area to inspect, inspection
frequency, what to look for and what action to take. A log sheet is included toward the end of the
chapter to help you track maintenance of your storm drainage system.
Although it is not intended for the maintenance survey to involve anything too difficult or strenuous, ,
there are a few tools that will make the job easier and safer, including: �
• A flashlight '
• A long pole or broom handle
• Some kind of pry bar or lifting tool for pulling manhole and grate covers
• Gloves
A resource list is included in the next chapter. There you will find the phone numbers of the
agencies referenced in the tables, as well as the contractors and consultants who designed and
constructed your facilities.
SAFETY WARNING: In keeping with OSHA regulations, you should never stick
' your head or any part of your body into a manhole or other type of confined space.
When looking into a manhole or catch basin, stand above it and use the flashlight
■ to help you see. Use a long pole or broom handle to check sediment depths in
confined spaces. NO PART OF YOUR BODY SHOULD BREAK THE PLANE OF
THE OPEN HOLE.
Resource Listing
If you suspect a problem exists, please contact your local jurisdiction at one of the numbers below
and ask for technical assistance.
CONTACT NUMBERS
King County (206)296-6640
Washington State University(WSU)Cooperative Extension (360)786-5445
DEVELOPER INFORMATION ENGINEER'S INFORMATION
Andrew Wang THE LAND DEVELOPER'S ENGINEERED SOLUTION
12419 NE 140th Street a division of The Land Developer, LLC
Kirkland, WA 98034 PO Box 4420
Tumwater,WA 98501
(360)250-3973
Highland Oasis Duplexes January 15,2015 PAGE 9
Downspouts
Inspection Frequency Look For Action
Area
Downspout Annually Water overflowing from the First clean the gutters and
downspout onto the ground. downspouts. If this doesn't solve
the problem, a larger drywell may
be required.
Roof Annually Moss and algae taking over Disconnect flexible part of the
the shadier parts of the downspout leading to the drywell.
shingles. Remove moss. Pressure washing
or use of fatty acid solutions,
instead of highly toxic pesticides or
chlorine bleach, is preferred. Install
a zinc strip as a preventative.
Highland Oasis Duplexes January 15;2015 PAGE 10
1�'IAINTENANCE REQUIREMENTS FOR
PRIVATELY nZAIrT4I?�'ED DRAINAGE FACILITIES
� NO. 8- FENCING
� Maintrnana Condition When Mamtenmxe Msintrnanu llaivrty or
Componeuts Defeu ls Needcd R�sults Afta Maintrnance
� General Missing or Broken Any defat in the fence that permiu Parts in plac� to provide adeqwce
Paru asy cn�y to�fsciliry. securiry.
Parts brokcn or missiag. Brokcn or missing puu replaced.
Erosioa Erosion raore than 4 iacbcs high and No openiag undez thc fence that
, 12-18 incha wide permining sn exceeds 4 inches in hei�ht.
� opening unda a fence.
W ire Fences Damaged Parts Posts out of plumb more than 6 inches. Posts plumb to within 1 'h mcbes.
, Top nils bent more than 6 incba. 7"op rail fra of bends greatrr than 1
inch.
Any put of fencc {including posts, top Fence is aligned aad metts design
raits, md fabric) more than 1 foot out sunduds.
of design alignmeat.
Missing or ioose t�:uion wire. Tcnsion wirc in place and 6olding
wire.
Missing or loose barbcd wirc that is Barbed w'vt in place with less tht '/.
sagging more ttsan 2 'h inches betweca inch sag between pc�su.
P�•
Extcnsion arm missmg,broken,or bent Extension arm in piue with no bends
out of shape morc than 1 '�4 inches. luger than'/.inch.
I�eunorated Paint Part or parts that have a rusting or Savcturally 'dequatc posu or pans
or Procectivc sc�ling condition that has affected with a unifo�m protecdve coating.
Cosang structunl adcquacy.
C��rning in Fabric Openings in fabric are such that an B- No openings in fabric.
;n;h diamrter ball could fit through.
.- ,�
MAINTENANCE REQUIREMENTS FOR
PRI�'�TELY MAINTaTNED DRAINAGE FACILITTES
NO. 1l — GROUNDS (Landscaping)
M�intrnance Condiiicn Whea M�imrnance Maintcnana Activity or
Components Defcct Is Necded Resulu Afla Maintenancc
Geaerel Weeda Weeds growing in more thau 20% of Weeds presmt in lcss than 5°io of the
(nowpoisonous) the landscapcd a:ea (vccs aad shrubs ]andscaped arca.
only).
Safery Hazatd Any presencc of poison ivy or other No poisonous vrgctation present in a
poisonous vegctation. landscaped area.
Trssh or Liaer Paper� caas, bottles, totsla�g �rc t�an Area clear ot litter.
l cubic foot within a ]andscaped area
(trees and shrubs onlyj of 1,00C� squarc
feer.
TTtes 8c Damege Limbs o; pazts of vices or shrabs that Trecs and shrubs w;th iess thnn `O��
g�� art split w broictn wbich affect more of the fo:�age w�ith spli� or trokrn
than 2'% of the total foliage of the tree limbs.
or shrub
"'rees or s`.r�bs ti:at have hce^ biow�n Trct ot shn:b ir. place free of�n�un.
down or ia�ockcd ovc:.
Trees or sluvbs •�.h�ch arc not Trcc cr shrut in riace and adequatcl_.
adequatdy supponed or are leaning supported; rcmcve am dced or
over,ausing e�cposure of she roou. discased trccs.
Log Sheet
Use log sheets to track maintenance checks and what items, if any, are repaired or altered. Make
copies of this page; use a fresh copy for each inspection. The completed sheets will serve as a
record of maintenance activity and will provide valuable information about how your facilities are
operating. Log sheets should be kept in a dry, readily accessible place.
INSPECTION DATE:
PERFORMED BY:
PHONE NUMBER: ADDRESS:
POSITION ON HOA: CITY,ST ZIP:
• •
• • � � � •
� • •
Highland Oasis Duplexes January 15,2015 PAGE 11
II. Chapter 3 — Best Management Practices for Single
Family Residence
Highland Oasis Duplexes January 15,2015 PAGE 12
•
• - �
Introduction..............._.__.............................................._........... ...._............... ........1
Residential Automobile and Boat Washing..........................................................R-I
Residential Storage of Solid and Food Wastes....................................................R-2
Residential Automobile Repair and Maintenance........................................... ....R-3
' Residential Hazardous Waste Use, Storage, and Disposal...................................R-4
Residential Gardening and Lawn Care.................... ............................................R-5
Residential Maintenance and Repairs...................................................................R-6
Residential Swnmmin� Pool and Hot Tub Maintenance.... ..................................R-7
� � � •
4 «
� . I • I
Th�s chapter cons�sts of a senes of u�fonnat�un sheets I�sUng the besi mana�ement pract�ces
(BMPs)that are required for single family residential activities in unincorporated King
County. The activity sheets in this chapter target typical household activities that have the
potential to pollute stormwater, surface waters,and�oundwater.
Stortnwater pollution occurs when water runs over the ground,picks up pollutants,and
washes the pollutants into surface and ground waters. Street storm drainage systems are
designed to prevent local flooding by cazrying stormwater runoff to nearby streams and
nvers. These drainage systems do not remove pollutants such as motor oil or soap.
Even small amounts of commonl�- used household products such as motor oil, pesticides,
paint waste, and soaps are harmful to aquatic life. Although individual activities may
appeaz insignificant, runoPf from urban areas is now a leading cause of water pollution in
nvers, lakes,and coastal areas.
king County's goal is to reduce pollut�on by educahng homeow�ners and residents to
prevent the contamination of stormwater runoff and our streams, rivers, lakes, and
�roundwater.
January 2009 King County Stormwatei Pollutron Prevention Manual
0
Residential Automobile and Boat Washing
Automobile washing is one af the most common resiciendal activities that pollutes surf'ace water.
streams,creeks, lakes,and Puget Sound_ [n addition to soap and dirt,vehicle wash H�atc r carnes
oii, grease,solvents,numents,and metals and to our local water bodies. The soaps and
detergents that we use to wash autamobiles can be more of a pollution threat than the Lnm�
washed off the automobiles. Even soaps that are labeled "biodegradable," "environmentall�
friendly" or"nontoxic" are hannti�i t� aquatic life and water qualin� The "nomosic"labei simpl�
means the soap is less tu��c t�� thc ��;�r
. �
Tbe following BMPs, or equiralent measures, methods or practices
are required ityou en�a�e in automobile or boat v►ashing at your
hcrme.
It i. ac�cptabl� t�� unu �����n t1i� h��d� ��(�,i �el�irlr i����il ��i�l�)u�t l�utri
w�thout doing any washwater BM}'s. �The�+a.h �tiat�r i� .ii��rtc� tr��n�
the storm drain, i e ti1a�h �+ater will infiltrat,
li �ou «a�h `c�ur aute�muhile or boat using m�ld deter�ents(pH neutral�
�m an area that allows far �nfiltration of the wash water, such as�ravel.
��rass, or loose soil, it is acceptable t�let the N�ash �vater infiltrate as
�OT1K 3& YOtI OII�V �S'aSft t}l��1ni�� ��l ifl� ��f1IC��' i I C 11��1 [}1� LII1����21I�fl�f�_'C
i+( �Ilil(It I
�I \��ll ��:l�fi �+I1 .! �?�1�C�j ;l(C:! �U��i 3� �+>ll( �1I\tV�;i\ 311�� U�� �ti3E�� i�[
other cleansers,y�ou shauld do ONE of d�e follo��in��
• Redirect the wash water ta��egetated areas sucl� ��� ian,i,���p�nz ,>>
your lavm. This can be accomplished by using temporary meas�u��
such as a berm, boom/socks,or other solid materials like a piece �f
lumber placed at the low point of w�here your��ehicle �s park�d Th��
w•ill direct the flow of water to your lawn or landscaping
• Use a wet vacuum to collect the wash water and then disJ}��.� ��i tl,�•
wash water to ��c�ur cink �r t�ilet far treatment at �our Ic�cal .r��ai�
treatment lant
P
Jenuary 2d09 K�ng County Stormwate�Pollut�on Preven'�on Manual
ResrderM�a!Automobde and Boat Wash�ng(cont�nued)
• ' • ' • � 1 '
Take vour vehicle to a commercial car wash where wash water �s
recvcled and dischar�ed to the sanitarv sewer. This also reduces th�
amount ��f�+ater used f��r �ehicle �+a,hin�
l l�e a hose nuzzle ���th a tn��er and shut it «ff Nhen �ou're nut usin� it
tu c�»>ser�e ��al�r
tie�er cican ur pre;�ur� ��a�h thr en��ne ��r under�arna�r uf�c�ur
automobile at home. The oil, grease, and other pollutants from this
activity can contaminate your property, as weU as groundwater such as '
shallow aquifers. This is especially important in areas where wells
provide potable water For this rype of cleaning, take the vehicle to a
commercial car wash where Hash water will be treated appropnatel�
There are several waterless car tiash products on the market. These
products are designed to clean and protect your vehicle without using
►�ater. Cloth. - �� � � , ,,� ,�, �. ,. _�. .� j �,, � , ,
a� �olid �+a�t�
1 ��r rnore mformadon or assistance in implemenung these best management pracuces,contact the Kmg County
I��•;,.,�yment of tiatural Resources and Park�VI'ater and Land Resources Di��sion at'_OG-'�-19O(l
K,ng ��oun�r��;'�m;,va!e� �eu�hor Preve�!�c� Ma���a� _'a^uary ''009
Residential Stora�e ot� Solid and Food Wastes
Improper storage of household garbage and ather wastes can lead to a variety of'pollutants �n
storm water runoff. Waste such as leaking garbage cans,yazd waste containers without lids.
scrap piles,and junk vehicles and equipment can cause polluted runoff from your propem t��
drain to surface and groundwater. Contaminants such as oils,greases, nutrients, bacteria.
patho��n�. and �u��ended .c�lids are carried t�� c,ur crtekc_ �tream�, lake�. n�erti. and Pu�et
Sound
�
I he folloH in� B�1Ps, ur eyui�alent measures, methocl�, or practice�
are required io storage otsolid and food wastes at your 6ome.
Dispose of unwanted garbage or scrap in your regular garbage sen��<
p�ckup containers,or dispose of garbage and scrap at a landfill or
transfer station. Do not let �arbage accumulate at your residence. Thr
accumulation of garbage is a surface w�ater concern and a health iss��e
Accumulated garbage can attract rc�dents. rats. mc�:qu�tc�es. and<�ther
pests that are also health hazard�
Waste stored outside should be kept �n ru��r�d :unta�ncr. ��r h� c����r��f
��ith a tarp_ All ���aste coniaincrs that .ir< <�ut�i��ur� �h��ul�i h<��r I�ti.
� � • t � �
Rec��cle as much as possible. Someone else ma� bc: able to use Irfi�����r
paints, finishes, cleaning materials, building matenals, ete. Contact a
ne�ghbor, friend, school, church,or communitv group to see if your lelt
over matenals can be used. The I�ing Count�� Indusmal Matenals
Exchange(IMEX)is a good resource for finding uses for ���<<r i�tt ,����
materials. Call IMEX at 206-296-4899 or send an e-mail tt�
imex'"c�kingcou�ty.gov. Consult the IMEX Web sire for rn;�<<
information, at http:'!w�ww�.govlink org�'hazwaste;business�m��
Another recycl�ng resource is the King Countti� Online Matcn;�;�
Fschan�e at http�"�•c�ur kin�rc�unt��-ti����'sc�lid�ti�aste=`e�chai���
.;a�..a�. _'��:9 k nq _,;,��� ;�o-�^.tia!e�Por'rurc,^ p�tie�,,o� Manua�
Rasdential Storsge o/Sol�d end Food Wastes(continued)
The King County Solid Waste Division provides waste disposal and
recycling information at
http://your.kingcounry.govCsolidwaste/index.asp. Informadon regarding
proper household hazardous waste disposal is available at
http://wvttiv.govlink.org/hazwaste/house,or contact the Hazards Line at
206-296-4692. See Activity Sheet R-4, "Residential Hazardous Waste
Use, Storage, and Disposal."
Compost biodegradable wastes rather than disposing of them as garbage.
Contact the King County Solid Waste Division at
http://your.kingcounty.gov/solidwaste�compostingJindex.asp for more
information on composting yard and kitchen waste.
Information on yazd waste collection sen7ces is available at
http:''your.k�ngcounh gov solidH asteigarba�:e-rec}clin���ardw�aste.asp.
D�spose c�t�pet ���aste in �our garba�e, bun it in �our yard 1 not in
�egetable gardens): or, dispose of in sanitary sewer systems such as your
toilet. See
http:!lyour.kingcounty.gov/solidwaste;`composti ng/petwaste.asp.
For more mfortnahon or ass�stance in�mplementm�these best management pracdces,contact the King County
Departme�t of Natural Resources and Parks Water and Land Resources Division at 206-296-1900
Kmg County Stormwa,'e�Pollutro�Prevenho� Manua; ,lanuary 2009 ',
�
_ � �- - ��:�.:�IM��
Residential Automobile Repair and Maintenance
Man} people prefer to repair and ma�ntain their vehicles at home Those that do need to ensure
that these activities do not pollute our streams,rivers, and lakes. Automobile maintenance and
repair activities can introduce chemicals such as oil, grease, antifreeze, hydraulic and brake
Fluids,and metals to our surface and groundwater. A recent study estimated that the amount of
oil running off our streets and driveways and ulpmately flowing into the oceans is equal to an
Exxon Valdez oil spill - 10.9 million gallons -every ei�;ht m�nths(NRC '_OU�i
�
The following best management practices(Bti1Ps) or equi�alent
measures, methods, or practices are required ityou en�aRe in
automobile repsir and maintenance at your home.
Collect a11 used oil, antifreeze,or other vehicle flwds �n containrn ���th
ti�ht fitting lids. Do not mix these fluids in the same conta�ner a. thi,
lim�ts youc abilih tc� rec��rl� the ��il at ���ur I���al ��utc� par1� ;t��r< <�r
service stah�>n
Never dispose uf u�d oil, antifreeze, or other tlwds ►nto a storni �irain
into a ditch, or onto the ground. Oil should be recycled at an auto part�
store or service station (?ther tluids can t�di�c�sed �f at a hc�usehold
ha7ardous waste collecn,�n .i1r ( ,ii) tli�• !���u���h��l�l h;i..tr�l��u� ��a>t�• lirt�
at 206-296-4692 or se�
http://www.govlink.or� h;in�.»r� h�,��.� G�r,�,iu�c� I�.t �tn� t�•� ��•c��l�n�
and disposal �nformation and la:atiu���
Never clean the engine or undercarr�a�e uf yuur �ehicle at huni�• I ��r
thi< t�re ��f rleanin��. take the �el�irle t� a cc�mmercial car ��a�li t,���l�i�
� �: �jfl}' j?�ifl� l;lf�,• ��; ;:\�Il �,ti�jf���,if�j �ffl�j lli\�,j��1��Cf Illl�j�� ifl�' ��'�il���'
t�� capture leaks or ;pills that ma� occur dunn� maintenance an�i i�4�.i�r
activities. Th�s ensures spilled tluids «cm't he ��ashed tc�the :t��rn�
drainaLe s�•stem the next time i� r,un�
�a��:;a��r :�.:�y w.�,;; � �;��nt. .;�^,,ti�ate� �c1,�u!,�r Gre✓e�r��or� Ma�Ua;
� _S ,r^_.: .....- - .... _ . .. , .�:. 'p� r . ;i'..
� i�ar uE; >},iii, ti1 it�� i.i�, ��i ab,urb�nt n����nal. �uci� a� ,�►n�l. Jin. ��r �.0
litter. Do not wash dc�a�n or hose dow�n these spiits m the curbs. '
rc,adwav_ or stc�� '
.+tl��i pai1� tl�at ma� ha�� ��i� �r �,reas} resieiue un thein, un�er c�n
and off the ground to minimize rainwater contact. Ra�nwater can �+ �
pollutSnts off the�e �artc and send �nll��tantc t� �t{�rn� cir;�in�t�e •���
and �r�und� �
.���i�t-i.��►1.Ji�c+�.i-�_i.i%��i.�
Take }our �eh�cle to a rumrnerc�al �,, �, �,. ,.,., , ., _ i ,. , ..
handled, recycled and disposed of correctly ta avoid pollutants bei�
introduced to our local water bodies. The EnviroStars I'rogram ce� I
husinesses for reducing, rec}clin�, and properly managing hazardous
N�aste. See http:,'i�;�« en�irostars.conij ro search for businesses that
have earned the En�iroStars rat�ng.
For more�nformaUon or ass�stance in implemennng these best management pract�ces,contact the King County
Departrnent of Natural Resources and Parks Water and Land Resources Divis�on at 206-296-1900
�;r,�, `.o J„ `, w•� , :t a.'e' ``�i� ;or F�F•.,' , �v�a'.,�3� _ar'ua.ry�"vi19
��
Residential Hazardous �'aste Use, Storage, and Disposal
I�here are a vanetv of hazardous matenals rout�nel� used in and around our homes including
chemical cleaners,pestic�des, paints, salvents, l�ghter fluid,gasoline, antifreeze,brake fluid and
��ther automotive products,w�ood preservatives and even batteries from our electronic equipment.
Improper disposal and failure to keep hazardous products from rainwater contact may cause
�urface and groundwater pollution. With so many hazardous compounds present in thousands of
househalds in King County, the cumulative adverse effects of poor usage, storage and disposal
��ra�tir�� are �utentiall� se�ere to our en�ironmental health.
. �
I�he followink be.t mana�ement practire• �B�IPc) or eyui�alent
measures, methods, or pracdces are required w�hen using or storing
hazardous wastes st your home.
Store all hazardous matenals inside a building or shed or under cover.
Dc� not expose hazardous materials ro rainwater that can transport
I�azardous pollutants to surf�ace and groundwater
L`se �rc?ducts �>t�l� a, sprc�tied ��n labeling d�rect�uns
Dispose of and recycle hazardous wastes throu�h the Household
Nazardous Waste Program or other recycling pro�rams or businesses,or
carefully foltow disposal directions on containers of chemicals. There
are three fixed hazardous waste collection sites for househald hazardous
waste in Seattle and King County. In addition,the Wastemobile travels
to different areas of King County throughout the year. See
http:-/v►�ww.govlink.or�;'hazwaste,mouse or call the Household Hazards
Line at 206-296-•�692 for more information.
Never allow hazardous chemicals to be discharged or dumped into storm
drainage s��st�ms �r on ro the eround
January 2009 K�ng County Stormwate!Polluhon Prpvenbon Menua!
Residential Flazardous Waste Use. Storege,and Disposal(continued)
• ' • ' • • I '
Reuse and rec�cle �� much as possible. Someone else ma� be able to use
leftover paints, finishes,cleaning matenals, building matenals,etc.
Contact a neighbor, fnend, school, church,or community group to see if
}�our left over materials can be used. The KinK County lndustrial
Materials Exchange(IMEX) is a good resource for finding uses for your
left over materials. Call IMEX at 206-296-4899 or send an e-mail to
imex a kingcounri.gov. Consult the IMEX Web site for more
information, at http: ����+�� go�link.or�.'han�aste'business,imex.
t ise the least toxic product a��ailable- See
http:Uwww.govlink.org/hazwaste�fiouse/alternatives for informat�on on
finding alternatives to hazardous household products.
For more informahon or ass�stance in implementing these best management pracUces,contact the Kmg County
Department of Natural Resources and Parks Water and Land Resources Division at 20fr29�1900
King County Stormwabr Polfution PreaerKron Manuaf January 2009
�-:
Residential Gardening and Lawn Care
Many pollutants can enter stormwater systems, ground�ater,and water bodres as a result c�f
typical lawn and gardeninK work. Runot�that is contaminated by pesticides and fertilizers ran
severely degrade receiving waters and result in adverse effects on fish and other aquatic life
Recent studies in the Puget Sound region detected pesticides in urban streams at levels that
exceed limits set to protect aquatic life. Some gardening chemicals are also harmful to children
and pets. Fertilizers add nutrients to water bodies causing unwanted algal blooms and other
aquatic plant growrth. Disposal of�nass clippings and other vegetation into storm drains,
stormwater ponds, roadside ditches and other water bodies can lead to decreased oxygen le��el.
in stormwater as the vegetation decomposes. Decreased oxygen levels can be lethal to fish ar�d
other aquatic life. Several simple practices can be used to prevent these problems, and ma� r�.ulc
in improved lawn and garden quality. These practices should also h� ,hal«1 �.�th E�r��,�t�
landscapers that conduct gardening and lawn care on your propem
Note: The term pesticide includes insecticides, herbicides. fi�n�icid��. r,��i�ntir��1�.. �tc
�
�I�he folluwing BM11Ps, or equi�alent measures, methods, ur practices,
are reyuired if you are en�a�ed in gardening and lawn care at �our
hume:
'����► .i����l� hrrt���i�lc�. �n;�ctic��3r,. i��dtnt��i�1r•. ��i fii�l���ciii�, .il��»r
the banks of stream and dra�nake channels with tlow�ng water,or alon��
the sh��rt� �,f laL.es ane� ��etl:u��� tic�er a��pl� the>e chemical> ��hen �t i>
rainii��
Martu�ll�\ itf Ilil'��l;I'11�3�;� I�I11�.''�� \�C�'�l� :lf,�; �'I�I�1 ���•��ti I;lt�l�( 1�I:111
Li�lil� �1�'�il�l��i� II1 :3f�.1� s�=� (ltllal;I1C G�[ �`E1t:;�lll..' �1�11�1
�,�!'E� � �lG , ��I�C�� 4'! �:"�t1�S/:'I� .11li: �.�ti�.li:`-.C!� ��� �1�'till�iljC� ill ;l
�uvered locat�on such as a�arden shed
l�u not sweep or dump grass clippings, lea��°� ��7r i,���. ,nt,< <�E�� ,tr��t_
dra�nage ditch, or stormwater facility or p���}�i
.,i^.,<I�.Y L,_,lty K.,�? .._u^fl �f�'^"�tdF'r ^'�1�7U."O�' '�'8ti'Ft)�l0/' Md�'l;;d'
Res,dantra!Gardenmg and Lawn care(conbnued)
Store piles of beauty bark and other erod�ble materials on lawns or other I'i
pervious areas. If these materials are stored on impervious areas such as �
driveways, cover them with a tarp so that rainwater does not wash the '�,
matenals into storm drains or ditches i
� • - • � � II
Purchase and use the least a�nount ot�pesticides necessan and always �
tollow the label d�rect�ons for application. Try pest control measures
that do not require chemicals first. See
http://www.govlink.orK/hazwaste.-'house/ti�ardipmhlems for infc�rn�ation
on how to reduce or avoid the use of pesticides
Compost your yard wastes,or use yard waste as mulch in your_yard or
�arden. Contact your local sol�d waste utility to see if yazd waste pickup '
service is available. See http:%!your.kingcounty.gov/solidwaste/garbage- I
recycling/yardwaste asp for mc�re �nformahon on vard �raste collect�on �''�
and recycling services �,
Educate yourself about altemati�es to chem�cal pestir�des and fertilizer5 I��
;uch as �ntegrated pest management techniques. Contact the Local '
I iazardous Waste Management Program at ?06-296-4692, or visit I
http:-!ww�v.govlink.or�*,'hazwaste�'house:yard !
Limit the amount of lawn and garden waterin � so that surface runoff I'
6
does not leave your property. Check automatic sprinkler systems to '
ensure water is dispersed to landscaped areas and not to hard surfacrs
such as dnveways and sidewalks that drain to stoRn cirama�� ��;tc�n�
Avoid planting species on the Noxious Weeds list F��r ,��>���an�� ��r
questic�ns c�ntact the N��i�us VVeee1 Sectic�n �f�1'I il[) :��
?OG-�'��,-����u�
� �i' :1:1�IC Ili(t'Itll:f;li�f� . � .1�»i,..11l�c � III;�`.�� Ic �. 'lc',l' .'l�, 1;1:11'�.I`-_l"�l�c':'�I �'� .i�i :c"� �. .,.tli ��''�l' �; ( . ,If=,.
Uepanment of hatural Resources and Parks N ater and Land Resources Di�►sion at 206-�yb-1�H
Reader Note The above requirements are the mimmum requ�red B'�iPs If these BMPs fail to prc.��:� ,:�„!;,,-__�� ;.
1�ICSIOfiT1<{...� �:��.r�� ,ti•r. ,ut: �.�;itt,�.,,,F.��� , ..i�..: ,..j!.h� �.�� �r..,..!c^ .� _. •cti.. �lr .� t?t�r��ur.; , u'i,. ,.
di.chatte;
� _.;n•y �rc� ..are� - .� eve�.,, 4�+a„�a� _a•..a , Dy
� _ - ,
Residential Maintenance and Repairs
There are a variety of home maintenance and repa�r activit�es rout►nely carnc;d out b�
homeowners in King County that have the potential to adversely affect our streams, n�er,. anJ
lakes. Pollutants generated from these activities can affect whether a lake or water bod} »
swimmable or fishable. Painting, pressure washing,carpet cleaning, moss control, and c��ncrrt�
repair and maintenance are a few examples of activ�ties homeowners conduct that can resuit in
pollutants being discharged to drainage systems,surface water,and ground water. Wash water
from these activi[ies ccmtain chemicals. suspended solids, or�anic compounds. deter�ents,
solvents, abnormal F�1 I. an� uthrr t���in. that h�i�r �► �1�trimrntal �in�l tu�i� ef�fr�t ��n fi�h an� ��thcr
aquatic life.
. � .
'The followin� BM11Ps, or equi�alent measures, methods ur practice�
are required when conductin� residential maintenance and repain at
��our homc.
�)O I101 (�1��)��>C ��1 �111� ��ii�I�1A:IICI 1111�� 1�1C �IfC�L LU((�t. �I��IIll ���:1111. �"1�
�iraina�e ditrh. ur intu a stream. rrcek. c�r c�ther hud� i�t��ater
f'AI'�T1NG Uu not dispo;e ot��ash �cater frc�m �lean�nz bru,hes, pauit
rollers, paint buckets, or conta�ners to surface water, storm drains, or
ditches. V�'ash water from latex paints can be disposed of to the sanitan
sewer. Empty containers of latex paint can be left open to dry out any
residual paint, and then disposed of in your normal �arbage or taken to ��
transfer station for disposal. Residual oil based pa�nt. pa�nt th�nn�n, anei
solvents must be disposed of as hazardous wastc
See http:%-�a��.Kovlink.org/hazwaste�'houseiproducts:list cfm �n�i
http:::%v►��w.govlink.org/hazwaste'puhlicatic�ns,Paim CommcmV���,�e• ��,i�
for information on the proper di�F����al ��t E�,�int ;�ncl .��I�eni ��:�.t�
PRESSURE WASHWG: Water �r��n� pr��,.ui�� ��,i.li�r�� ,f���{.�. �1ri�,�<<n�
roofs, or other hard surfaces ma� conta�n sus�n�rc1 sulids and uth�r
pollutants that should not be directly discharged to drainage system�
Redirect pressure wash�ng wastewater to vegetated areas or areas su�h ,��
�:ravel, lawns, landscaping, or bare soil where the water will infiltra��•
slowly into the ground. If this cannot be accomplished, filter the wa�h
warer through filter fabnc, or other filtenng media to collect the
suspended solids before discharging the water to a drainage system It .�n�
.;anua�y �009 K,�c ;,ounty Sto�mwate�Polluhon �reve�bc�� Man;;a,
Residenha/Ma�nienance and Repa��s (conUnuedl
chem�cals are used dunng the prea�ure «ashin� proc;ess, the wasteµater
must be collected and disposed of in a sanitary sewer system or infiltrate�i
on site. If moss control or another chemical treatment is used during
pressure washing of roofs,disconnect the downspouts so the chemicals Ju
not dischazge to the storm drainage s�stem, and disperu the �ash w�ater
unto adjacent lawns and landscaping.
CARPET CLEANING: Most commercial carpet cleaners have onboard
wastewater recycling systems If you do your own carpet cleaning, the
wash water must be discharged to the sanitary sewer or your septic
system. Filter the water if it contains lint or other particles to avoid
clogging the drains. lf you prefer not to discharge the water to your septic
system,you may also discharge the water to your lawn or a landscaped
area to allow the washwater to infiltrate slowly into the ground. Be aware
that detergents and other cleaning chemicals such as solvents can be
harmful to vegetation and septic systems. Discharging wash water to the
ground may not be allowed if you live in a Critical Aquifer Recharge
Area(CARA). Never dispose of carpet cleaning wash water to a storm
drain,drainage ditch,or surface water. Carpet cleaning wastewater
contains chemicals,detergents, and suspended solids that adversely
impact the qualiry of surface and ground waters.
CEMENT/CONCRETE WORK: Concrete�cement wash water has a pH
level that is toxic to aquatic life. Do not allow wash w�ater from concrete
work to discharge into storm dra�nage systems, including small yard
drains or adjacent roadwa�•s. This is especially important when installing
washed aggregate driveways or patios. Direct the wash water to vegetated
areas or dig a hole where the wash water can settle and infiltrate slowly
into the ground. The cement residue can be mixed into the soil where the
wash water is infiltrated with no detrimental effects, and the pH will be
neutralized.
• • � • �
I lirc a professwnal home maintenance and repair company that follows
tlie approved BMPs for home repair and maintenance,as adopted by King
County If�ou have questions about which Best Management Practices a
business must compl�� w�th contact King County Water and Land
Resources at 206-296-I 900 or see
http:llwww.kingcounty.gov/env�ronmenti'waterandland�stormwater.aspx.
Remember, as a homeowner, you have a responsibility ro ensure y�our
contractors follow� the reqwred Best Management Practices. As part of
your agreement with contractors, require them to follow all King Count��
Codes and regulations.
IG)►y County Stamwater Poffution Prevention Manual January 2009
. �
,
Residential Swimming Pool and Hot Tub Maintenance
Many residents in King County have swimm�ng pools, spas, or hot tubs. lmproper drainage or
discharge of pool water to storm drains or ditches during maintenance activities can lead to
nutnents,suspended solids,chlonne, abnormal pH, and other chemicals entering our streams,
nvers,and lakes. Chemicals used in pool, spa, and hot tub maintenance can contaminate
stoRnwater and surf'ace water if they are not stored, used, and disposed of correctly
�
"('he tollow inR BMPs, or equi��alent measures, methods or practices ,
are required when draining or msintainiag your pool, spa. or hot I
tu b.
Dechlonnate pool,hot tub,and spa water if it is to be discharged to the
�,Tound. Neutralizin�chemicals are available. Letting d�e pool, hot tub,
or spa"sit"with no chemicals may reduce chlonne levels. State law
allows discharges of pool water to the ground if the chlonne level is
below 3 ppm (parts per million). The pool water must be drained to the
�ound in a manner so that it dces not cross property lines or cause
erosion problems. Never discharge pool water directly to storm drains or
ditches.
If pool or spa water cannot be dechlorinated,the water must be drained
to the sanitary sewer or collected b� a pc�l maintenance company for
c�f�t=site di�pc��l
Uiat�ma�euu,earth (c��mmunl� uscd a� a filtenn� a�ent 1 and Hater
from backflushing tilter systems cannot be discharged to surface waters,
storm drainage systems, septic systems,or the ground.
Pool water that has been treated with copper based algaecides ma�• not
be discharged to the ground.
January 2009 Kmg County Stormwater Polluhon Preventron Manua!
Res�dentia!Swimming Pool and Hot Tub Marnfenence(aonhnued)
• ' • ' / �
Hire a professic,nal pe,��l maintenance cc�mpan� t�� ;en ice �c�ur p��rl_ h„t
tuh ��r �pa
F�,i m�+rc int�xmati��n ur a„utan�c in imF�IrmrntinL the,n c��t mana�rment prarn�eti :�,n�art thr hin� ( ��unh
I)e�wrtrtl�nl��f �.itural Kc�sour�es and Par�,,��ater snd l.:ind Kc_�uur�c�s Ui�i5i�m at'��h-���n-I�HN i
K,ng County Stormwate�Pouutron Prevenhon Manual January 2009
Appendix E - Geotechnical Report
Highland Oasis Duplexes May 11,2015
i
� �. . �� �-- -��. ,r•,F��M �. ,��.- .� ;�
Bergq ist Engineering Services
27207 8th Avenue S P. O. Box 13309
Des Moines, Washington 98198 Des Moines, Woshington 98198
Phone: 253.941.9399 • Fax 253,941 ,9499 • E-mail; soilsengineering@aol,com
October 4, 2013
Mr. Andrew Wang
12419 NE 140�^ Street
Kirkland, Washington 98034
Re: Subsurface Exploration, and
Geotechnical Engineering Services
Two Duplex Residences
1419 Jefferson Avenue NE
Renton, Washington
King Co. Tax Parcel No. 7227801625
BES Project No.: 201338-1
Dear Andrew:
We are pleased to provide this report of our subsurface exploration and
geotechnical engineering properties of the subsurface soils for the planned infiltration
trenches for the referenced project. This work was performed in accordance with our
proposal number 1182013 dated June 12, 2013, which you authorized on September 3,
2013.
PROJECT DESCRIPTION: The referenced property will be developed with two,
residential dupfexes. According to Andy Rykels, PE of Rykels Engineering Group, Inc.,
stormwater will be dispersed by sheet flow.
SCOPE OF WORK: Bergquist Engineering Services excavated one test pit to a
depth of about eight (8) feet below the existing grade. The test pit was be excavated in a
DOWN TO EARTH ENGWEERING SOtUT10N5
' � .
Mr. Andrew Wang BES Project Number. 201338
Renton, Washington October 4, 2013
location selected and located in the field by Mr. Richard Bergquist by measuring from the
survey stake in the northeast corner of the property (see the SITE PLAN attached to this
report.) Bulk samples were obtained at changes in the soils type. The test pit was
backfilled upon completion of the soil sampling.
TEST RESULTS: The surface soils to a depth of eighteen (18) inches feet consisted
of dark brown, medium-dense Silty SAND (ASTM (SM)) topsoil. Underlying the topsoil and
extending to a depth of three and a half (3�) feet, light brown to brown, dense, Silty SAND
{ASTM (SC-SM) was encountered. Below a depth of three and a half feet, dense, Silty
SAND (ASTM (SGSM)) of alternating colo�s from gray-brown, reddish-brown, and light
brown. According to the USDA Textural Classification, these soils are loamy sands. The
results of the field sampling and laboratory testing are attached to this report.
If you have any questions, please contact me.
P�D A-BERGp Sincerely,
�G��,°F�4�'�Sy��^G's,, Bergquist Engineering Services
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,t� G/STER �
�SS�UNAI.ti`,G` Richard A. Bergquist, P.E.
Principal
Attachments:Site Plan
Log of Test Pit 1 and USDA Textural Classification Chart
Test Pit Log Notes
Unified Soil Classification System
Particle Size Distribution
Copies to: Addressee (5)
Bergquist Engineering Services Page 2 of 2
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From Rykels Engineering Group, Inc.
SITE PLAN
Bergquist Engineering Services HIGHLAND OASIS DUPLEXES
PO Box 13309, Des Moines, Washington 98198 1419 Jefferson Avenue NE,
� Ph. 253.941 .9399, Fax 253.941 .9499 Renton, Washington
email: SoilsEngineering@aol.com
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Bergquist Engineering Services
Log of Test Pit TP1
Project. Duplex for Andrew Wang Excavation Rig: JCB 808 Super Ba�khoe
Location: 1419 Jefferson Ave. NE Excavated By� Davies Drilling, Inc.
BES Proiect No.� 201338-1 Logged By= R. A. Bergquist, P.E.
Date Excavated� Sept. 18, 2013 Approximate Ground Surface Elevation: 378' MSL'
m m �c u`� � o � c�
L � � E � � � � � Description (Unified Soil Classification System)
� � �z j � � v � I1SDA Soi/Textura/Classification
� �
_ -- SM --
(Dark brown, medium-dense Silty SAND {Topsoil)
-�- l DAMY SAND -� �
.
_ .
�----------------------------------------------------. -
_2_ _2_
_ BS1 SC-SM 9.0 Light brown to brown, dense Silty SAND
_3_ LOAMY SAND _3_
- --------------------------------------------------------------
-4- BS2 SC-SM 11.3 Gray-brown, dense Silty SAND, with gravel _4_
- BS3 SC-SM 10.5 -------------------- ---------------------------
_5_ Reddish-brown, dense Silty SAND, with gravel _5_
_ BS4 SC-SM 14.1 ---------------------I rJAMY.SAAI/?-----------------------------
_6_ _6_ I
_ BS5 SC-SM 15.6 Light brown, dense Silty SAND with gravel -
-�- LOAMY SA1VD -�- �
_8_ _8_
END OF TEST PIT. DRY AT COMPLETION.
*Ground surface elevation interpolated from Rykels Engineering Group, Inc. Cover Sheet.
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TEST PIT LOG NOTES
These notes and test pit log are intended for use with this geotechnical report for the
purposes and project described therein. The test pit log depicts BES' s interpretation of
subsurface conditions at the location of the test pit on the date noted. Subsurface
conditions may vary, and groundwater levels may change because of seasonal or
numerous other factors. Accordingly, the test pit log should not be made a part of
construction plans or be used to define construction conditions.
The approximate location of the test pit is shown on the Site Plan. The test pit was
located in the field by Mr. Richard Bergquist by measuring distances trom existing survey
corner stakes. The ground surface elevations were interpofated from a topographic map
supplied by Rykels Engineering Group, Inc.
" Sample Type" refers to the sampling method and equipment used during exploration
where:
• "BS#" indicates a bulk sample taken from the ground surface or from the excavator
bucket.
" Moisture Content" refers to the moisture content of the soil ex ressed in r
p pe cent by
weight as determined in the laboratory.
" Description and Classification" refer to the materials encountered in the test pit. The
descriptions and classifications are generally based on visual examination in the field and
laboratory. Where noted, laboratory tests were performed to determine the soil
classification. The terms and symbols used in the test pit log are in general accordance
with the Unified Soil Classification System. Laboratory tests are performed in general
accordance with applicable procedures described by the American Society for Testing and
Materials.
" �" Indicates location of groundwater at the time noticed.
� Indicates location of seepage of water and the time noticed.
TERMS for RELATIVE DENSITY of NON-COHESIVE SOIL
Term Standard Penetration Resistance `� N"
Very Loose 4 or less
Loose 5 to 10
Medium Dense 11 to 30
Dense 31 to 50
Very Dense Over 50 blows/foot
� f 1 ,
TEST PIT LOG NOTES continued
TERMS for RELATIVE CONSISTENCY of COHESIVE SOIL
Term Unconfined Compressive Strength
Very Soft 0 to 0.25 tons/square-foot
Soft 0.25 to 0.50 tsf
Medium Stiff 0.50 to 1 .00 tsf
Stiff 1 .00 to 2.00 tsf
Very Stiff 2.00 to 4.00 tsf
Hard Ove� 4.00 [sf
DEFINITION of MATERIAL by DIAMETER of PARTICLE
Boulder 8-inches+
Cobble 3 to 8 inches
Gravel 3 inches to 5mm
Coarse Sand 5mm to 0.6mm
Medium Sand 0.6mm to 0.2mm
Fine Sand 0.2mm to 0.074mm
Silt 0.074 to 0.005mm
Clay less than 0.005mm
. � � '
UNIFIED SOIL CLASSIFICATION SYSTEM (USCS)
COARSE GRAINED SOILS
(Less than 509�o fines. Fines are soils passing the#200 sieve.)
GROUP SYMBOL DESCRIPTION ' MAJOR DIVISIONS
GW e -gra or - I
mixtures,less than 59%fines.
GP Poorly graded GRAVELS or GRAVEL-SAND GRAVELS
mixtures,less than 596 fines.
i ty RAV , RA - - ILT mixtures, More than half of coarse fraction is
GM more than 129b fines. larger than No.4 sieve.
GC Clayey GRAVELS,GRAVEL-SAND-CLAY
mixtures,more than 129U fines.
SW e -yra or rave y
mixtures,less than 535 fines.
Poorly graded SANDS or Gravelly SANDS
SP � SAN DS
, mixtures,less than 546 fines.
SM Silty SANDS, SAND-SILT mix[ures,more than More than half of coarse fraction is
12°rb fines_ smaller than No.4 sieve.
SC Clayey SANDS, SAND-CLAY mixtures,more ,
than 124b fines
-1-
Note:Coarse-grained soils receive dual symbols if they contain between 5 and 12 percent fines.
FINE-GRAINED SOILS
(More than 50°r6 fines. Fines are materials passing the#200 sieve)
GROUP SYMBOL DESCRIPTION MAJOR DIV�SIONS
ML Inorganic SILTS,very fine SANDS,ROCK
FLOUR.Silty or Clayey SANDS
� m�sr�a�s�c� o ow a�i pr��jr���y:� SILTS and CLAYS
CL Gravelly CLAYS,Sandy CLAYS,Silry CLAYS, '
Lean CLAYS Liquid limit less than 50
OL i Organic SILTS,or organic Silty CLAYS of low
plastfciry
Inorganic SILTS,Micaceous or Diatomaceous
MH fine SANDS or SILTS,Elastic SILTS �
! SILTS and CLAYS
CH I� Inorganic CLAYS of high plasticiry,fat CLAYS , Llquld�Imtt gfeatef thatl 50
OH Organic CLAYS of inedium[o high plasticiry i
pT I PEAT,MUCK,and other highly organic soils Highly organic soils
� I —
No;e: Fine-grained soils receive dual symbols if their limits p�ot left of the"A"Line and have a plasticity index
(PI)of 4 to 7 percent.
UNIFIED SOIL CLASSIFICATION SYSTEM
Bergquist Engineering I
Services
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Bergquist Engineering Services
Grain Size Distribution
Test Pit TP 1, 2.5' to 3.0'
U.S.Standard Sieve Opening in Inches C.S.Standard Sieve Numbers Hydrometer Resulu
100% 20 � � 0%
90% __ _ _ __.. _ 10%
80% _ _`:_..__ _ _ - ' ;- c__._.. _. ..- _ � _.__.....__ 20%
-- 70% ___ _ :.___ . _- 30%
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� 6�% _ ,..._.._. _ ___ 40% G�
� _ �__ __ _... _ ___. _
T . _. .. , . . . . . . . . �
� f�0� ... . . ..........F�.__'___ _._.. _ . .{_ . . ._.. .. . . .. . . . . . .. . . .. . ._.. . . ��� d
C .
(A TV% . _._..... � . .._._.. _ . .... ..� _. _ . . . _ . .. _...._.."_'_._.____.""...... ... ... ."".. �% �
e6 . . . ., . . fp
a m
0 30% __. ._ - _ 70% �
20°�6 .. .. 80% '
10% _ _ 90°k
0% 100%
1000 100 10 1 0.1 0.01 0.001
Grain Size in Millimeters
Cobbles Gravels Sands Silts Clays
Coarse Fine Coarse Medium Fine
Date: 08/25l13 Dio=0.03 USCSCIassification %Gravel %Sand
Sample#: 201338-1 D30'0.17 SGSM,Silry,Clayey Sand u'ith Gravel
Sample[D: TPl,B51 D�=2.15 Specifications 26.8% 51.6%
3ource' 'fes[Pit C�=037 No Specs
Projcct: Duplex C��=62.18 Sample hiatc Specs %Sih&Clay
Locfltion: Renton,WA Liquid Limit=0.0% nia 21.7°/a
Test Pit TP] Plastic Limir 0.0% Fineness Modulus
Depth: 2.Sft Plasticity Index=0.0% 3.11
uarse Actu I terpo at mes ctua terpo ate
Section CumulaUve!Cumulative Section Cumulative Cumula[ive
Sieve S�� � Percent i Percent , Specs Specs Sieve vx --j Percent Percent Specs Specs
US Meuic � Passing Passing ' Max Min US Metric Passine Passing , Ma�c Min
6.00" 150.00 100.0% #4 I 4.750 7 .2% 73.2% i
4.00' 100.00 100.0% #8 2.360 61.1% I
3.00" 75.00 100.0% �!10 2.000 59.2%
2.50" 63.00 100.0% i #16 1.180 , 55.1% i
2.00" I 50.00 100.0% ' #20 0.850 53.4%
1.75" I 45.OQ 100.0% j 1�30 0.600 52.1% '
1.50" 37.50 � 100.0% #40 0.425 51.2% 51.2%
1.25" 31.50 100.0% �t50 0.300 I 41.0%
1.00" 25.00 100.D% 100.0% #60 Q.250 i 36.9%
7/8" � 22.40 100.0% ]00.0% #80 0.]80 � 31.1%
3/4" I 19.00 95.'% 95.7% � e100 0.150 28J% 28.7"o I �
�/8" 16.00 91.7% i q140 �i 0.106 24.6% '.
1/2" 1250 87.0% 87.0% j �170 ' 0.090 � ' 23.l% � �
3/S" 9.50 81J% 'i ', #200 i 0.075 2L7% � 21.7% �
1!4" � 630 76.0°io � N270 � 0.053 �
#4 ' 4.75 73.2% ' 732°io
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Bergquist Engineering Services
Grain Size Distribution
Test Pit TP1, 3.5' to 4.5'
L:.S.Standard Sieve Opening in Inches U.S.Standard Sieve Numbers Hydrometer Results
1�°� 2o a a o � Do�
90% __ _ -_ _ 10%
80ko � ;__ ...... .. __--.... _
_ _ , ,_._ ._..----- - _.._. _._._. _.---- 20%
-- 70% :..:- -__--___ ._ _ __....__. _.._...._. ----___ __ - 30%
t _ _..__.._
3 �% _._ ___._.... ------ _ _ . _ _ _-- -- --- -. _ _ 400� �
�, -
:.. : . _
� 5p% _. . . _ . .:_.,_ ___ --- _._;.... ..._ - . _--.._: ....._--. ___.____. _ - - _ 50% �
� �
uNiQ�% ..__. __ .._... .... .... . .--'---- --- --r..- ---------- -..._...__.__. ...--- . .... .._� --�---...----- - �-�-�--___ ._.._ ..-- - �% �
m ... . ., . :., . . . . . � . . .. . . �� ' , 'N
a _.__ o �,
�
3U% -- --- -.;__ .... - - ___ . _ :_ - _ _ 70k �
, •
_ ;.
20% _ : - -__ . �.. _-.. _.-. .- -- .. _ . ___ . �o� a
10% . _ _ gQ%
0% � � 100%
1000 100 10 1 0.1 0.01 0.001
Grain Size in Millimeters
Cobbles �avels Saods Silts Clays
Coarse Fine Cuarse Medium Fine
Datc: 0825l13 D��=0.04 USCS Classification 4io Gravel °io Sand
Sample#: 201338-1 D,�,=Q.16 SGS!�f.Silty.Clayey Sand with Gravel
Sample[D: TPI,BS2 D�=0.93 Specifications 16.1% 64.0°0
Source: Test Pit C�-0.76 Vo Specs
Project: Duplex C�=2A.64 Sampk Meets Specs %Silt&Clay
Location Rentoq W'A Liquid Limit=0.0% nla 19.9%
Test Pit TP 1 Plastic Limit=0.0% Fineness Modulus
Depth: 4ft. P►asticity Inde�c=0.0% 2.61
oarse ctua nterpo at mes . ctua terpo ate
Sec6on Cumulative Cumulative Sec[ion Cumulative Cumulazive
Sieve Size Percent �I Percent f Specs Specs Sieve Size Percent Percent Specs i Specs
US Metric Passing I Passing �, Ma�c 'vlin US Mehic ; Passing Passine Ma�c ' Min
6.00" � 150.00 ! 100.0°.�0 #4 4.750 83.9% 83.9%
4.00" � 100.00 100.0% #8 2.360 � 68.9°io , ;
3.00" � 75.00 100.0% �rl0 2.000 66.7°ia � '
2.�0" 63.00 100.0°./0 �I6 � I.I80 61.6% I
2.00" 50.00 100.0% #20 0.85U 59.5% �
1.75" 45.00 100.0% �330 0.600 57.9% �
1.50" ( 3'.50 I 100.0% I #40 0.425 56.8% 56.8% I
1.25" ' 31.50 ]00.0% i #50 0.300 44.D%
1.00" � 25.00 300.0% 100.04/a �i, � #60 Q.250 � 38.9%
7/8" 22.40 ]00.0% i ]00.0% i i #80 O.I80 � 31.7% j
3/4" ' 19.00 100.0% 100.0% I N 100 ' 0.150 28.7% 28.7%
5/8" 16.00 140.0% ' 11140 � 0.106 23.5% I
1l2" 12.50 100.0% ' 100.0% � #170 0.090 21.6"/0 �
3!8" 9.50 93.8% ' !?200 0.075 19.9% 19.9%
1/4" 6.30 I 87,1% #270 �� 0.05� ' ,
#4 4.7� 83.9% ' 83.9% I
i
J � • •
Appendix F- KCRTS Drainage Analysis I
Highland Oasis Duplexes May 11,2015
� , . .
Flow Frequency Analysis
Time Series File:14-082pre.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
0.016 2 2/09/O1 18:00 0.020 1 100.00 0.990
0.004 7 1/06/02 4:00 0.016 2 25.00 0.960
0.012 4 2/28/03 3:00 0.012 3 10.00 0.900
0.001 8 3/24/04 20:00 0.012 4 5.00 0.800
0.007 6 1/OS/OS 8:00 0.011 5 3.00 0.667
0.012 3 1/18/06 21:00 0.007 6 2.00 0.500
0.011 5 11/24/06 5:00 0.004 7 130 0.231
0.020 1 1/09/08 9:00 0.001 8 1.10 0.091
Computed Peaks 0.019 50.00 0.980
�
I
' 14-082pre-out.bct[5-1 li?O15 5:01:58 PM]
.. , , �
14-082post-out-2
Flow Frequency Analysis
Time Series File:14-082post-2.tsf
Proj ect Location:Sea-Tac
---Annual Peak Flow Rates--- -----Flow Frequency Analysis-------
Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob
(CFS) (CFS) Period
0.036 5 2/09/01 2:00 0.073 1 100.00 0.990
0.029 8 1/05/02 16:00 0.044 2 25.00 0.960
0.043 3 2/27/03 7:00 0.043 3 10.00 0.900
0.031 7 8/26/04 2:00 0.039 4 5.00 0.800
0.036 6 10/28/04 16:00 0.036 5 3.00 0.667 �
0.039 4 1/18/06 16:00 0.036 6 2.00 0.500 I
0.044 2 10/26/06 0:00 0.031 7 1 .30 0.231 'I
0.073 1 1/09/08 6:00 0.029 8 1 .10 0.091
Computed Peaks 0.063 50.00 0.980 !,
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