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Home My WebLink About03686 - Technical Information Report � � V �"� TECHNICAL I NFORMATION REPORT Site and Building Modifications for Ace Aviation 289 East Perimeter Road ` ,� Renton, WA 98057 �� (j1 � �� o � � z � � Prepared for: � Ace Aviation, Inc. �� 289 East Perimeter Road , Renton, WA 98057 March 8, 2013 Revised June 12, 2013 Our Job No. 15559 �(�' �� )��RF�+AC�eS �t•�� f��r. aT + �► ,JL i F' '�/ p �'2769 :� �' �'��ti , �: S�U,� ��. l• 4�yHA� - S mZ CIVIL ENGINEERING, LAND PLANNING, SURVEYING 1 SZ'I5 72ND AVENUE SOUTH KENT,WA 98032 (425)251-6222 (425)251-8782 F�c n � i 2 BRANCH OFFICES ♦ OLYMPIA,WA ♦ CONCORD,CA ♦ TEMECULA,CA s�� y www.barghausen.com >, �E ~G ENGtN 3 <08 � TABLE OF CONTENTS 1.0 PROJECT OVERVIEW 2.0 CONDITIONS AND REQUIREMENTS SUMMARY 3.0 OFF-SITE ANALYSIS 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN 6.0 SPECIAL REPORTS AND STUDIES 7.0 OTHER PERMITS 8.0 CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN ANALYSIS AND DESIGN 9.0 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT 10.0 OPERATIONS AND MAINTENANCE MANUAL Figure 1 —TIR Worksheet Figure 2—Vicinity Map Figure 3—Drainage Basins, Subbasins, and Site Characteristics Figure 4—Soils 15559.001 � W � � W � O H C� W � O OC a 0 T 1.0 PROJECT OVERVIEW The site is located within a portion of the northeast quarter of the northeast quarter of Section 18, Township 23 North, Range 5 East, Willamette Meridian, Ciry of Renton, King County, Washington and comprises approximately 1.856 acres. More particularly, the site is located at 289 East Perimeter Road within the City of Renton and on a portion of the Renton Municipal Airport. The attached viciniry map gives the exact location of the project site. The proposal for this development is to demolish a portion of an existing building and construct a new larger building. Additional site modifications will include the addition of sidewalks, parking relocation, and additional landscape planters and water quality features. The existing site is almost entirely impervious surface, consisting of buildings and pavement, with the remaining area gravel or dirt. Under the proposed condition, much of this gravel or dirt area will be converted into landscaping or building, and the amount of runoff generated from the site will decrease since landscaping will replace a portion of the existing impervious surface. This project does not propose flow control nor is it required for this project site. There is an existing conveyance system that routes and drains directly into the Cedar River located northeast of and immediately across East Perimeter Road from the project site. Since this project site is located on a portion of the Renton Municipal Airport, it is relatively flat in nature. It is anticipated that minimal grading will occur and site grades will stay much the way they are. Please see the existing and proposed site land coverage table on the following pages of this report for a complete description of the site land coverage. As requested by the airport, water quality to trap oils will be provided for this development in the form of a coalescing plate oil/water separator. Please refer to the calculations on the following sections of this report. � ; I � � 15559.001 EXISTING AND PROPOSED SITE LAND COVERS Existing condition of area to be modifie Existing building to be demolisl�4u = ; �,u;�, �: Existing landscaping to be removed = 820 sf Existing impervious to be replaced with either new impervious or landscaping = 15,046 sf Total = 26,882 sf Proposed condition of area to be modified: New building = 20,478 sf New landscaping = 2,064 sf New sidewalk = 4,340 sf Total = 26,882 sf 15559.001 T � W W _ � � � O � � H � � w � � C� � KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND Part 2 PROJECT LOCATION AND PROJECT ENGINEER DESCRIPTION Project Owner Ace Aviation Project Name Ace Aviation Site Modification Phone DDES Permit# Address 289 East Perimeter Road Location Township 23 N Range 5 E Project Engineer Ali Sadr Section 18 Company Bar�hausen ConsultinQ En�ineers, Inc. Site Address 289 East Perimeter Road Phone (425) 251-6222 Renton,WA 98057 Part 3 TYPE OF PERMIT APPLICATION Part 4 OTHER REVIEWS AND PERMITS ❑ Landuse Services ❑ DFW HPA ❑ Shoreline Subdivision / Short Subd. / UPD ❑ COE 404 Management � Building Senrices ❑ DOE Dam Safety � Structural M1F /Commercial / SFR RockeryNault/ ❑ Clearing and Grading ❑ FEMA Floodplain � ESA Section 7 ❑ Right-of-Way Use ❑ COE Wetlands ❑ Other ❑ Other Part 5 PLAN AND REPORT INFORMATION Technical Information Report Site Improvement Plan (Engr. Plans) Type of Drainage Review Full / Targeted / Type(circle one): Full / Modified / (circle): Large Site Small Site Date(include revision Date(include revision dates): dates): Date of Final: Date or Finai: Pa�t 6 ADJUSTMENT APPROVALS Type(circle one): Standard ! Complex / Preapplication / Experimental I Blanket Description: (include conditions in TIR Section 2) Date of Approval: 200� Surface Water Design Manual 15559.003.doc[8/3/06] 1/1/OS i 1 � KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 7 MONITORING REQUIREMENTS i Monitoring Required: Yes / N� Describe: Start Date: Completion Date: Part 8 SITE COMMUNITY AND DRAINAGE BASIN Community Plan : Renton Special District Overlays: Drainage Basin: Cedar River Stormwater Requirements: Peak Rate Flow Control Standard Part 9 ONSITE AND ADJACENT SENSITIVE AREAS � River/Stream ❑ Steep Slope � Lake ❑ Erosion Hazard ❑ Wetlands ❑ Landslide Hazard ❑ Closed Depression ❑ Coal Mine Hazard ❑ Floodplain ❑ Seismic Hazard ❑ Other ❑ Habitat Protection ❑ Part 10 SOILS Soil Type Slopes Erosion Potential Urban Land ❑ High Groundwater Table(within 5 feet) ❑ Sole Source Aquifer ❑ Other ❑ Seeps/Springs ❑ Additional Sheets Attached 2005 Surface Water Design Manual 15559.003.doc[8/3/06] 1/1/OS i 2 K1NG COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 11 DRAINAGE DESIGN LIMITATIONS REFERENCE LIMITATION/SITE CONSTRAINT ❑ Core 2—Offsite Analvsis ❑ Sensitive/Critical Areas ❑ SEPA ❑ Other ❑ ❑ Additional Sheets Attached � Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet perThreshold Discharge Area) Threshold Discharge Area: (name or description) Core Requirements (all 8 apply) Dischar e at Natural Location Number of Natural Dischar e Locations: Offsite Analysis Level: 1 / 2 / 3 dated: Flow Control Level: 1 / 2 / 3 or Exemption Number incl. facilit summa sheet Small Site BMPs Conveyance System Spill containment located at: Erosion and Sediment Control ESC Site Supervisor: Contact Phone: After Hours Phone: Maintenance and Operation Responsibility: Privat / Public If Private, Maintenance Lo Re uired: Yes / No Financial Guarantees and Provided: Yes / No Liabilit Water Quality Type: Basic / Sens. Lake / Enhanced Basicm / Bog (!n�I�dg f��ili4�i�Umm�r�i chect� nr FKarr��tir)n �n, Landsca e Mana ement Plan: Yes / No I Special Requirements(as applicable) Area Specific Drainage Type: CDA/SDO/MDP/ BP/LMP I Shared Fac. /None �� Re uirements Name: ', Floodplain/Floodway Delineation Type: Major / Minor / Exemption / None 100-year Base Blood Elevation (or range): Datum: Flood Protection Facilities Describe: Source Control Describe landuse: (comm.lindustrial landuse) Describe any structural controls: 2005 Surface Water Design Manual 15559.003.doc[8/3/06] 1/1/OS 3 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Oil Control High-use Site: Yes / N Treatment BMP: Maintenance Agreement: Yes / No with whom? Other Drainage Structures Describe: Part 13 EROSION AND SEDIMENT CONTROL REQUIREMENTS MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION AFTER CONSTRUCTION � Clearing Limits � Stabilize Exposed Surfaces ❑ Cover Measures � Remove and Restore Temporary ESC Facilities � Perimeter Protection � Clean and Remove All Silt and Debris Ensure ❑ Traffic Area Stabilization Operation of Permanent Facilities ❑ Sediment Retention ❑ Flag Limits of SAO and open space preservation areas ❑ Surface Water Control ❑ Other ❑ Dust Control ❑ Construction Sequence Part 14 STORMWATER FACILITY DESCRIPTIONS Note: Include Facilit Summa and Sketch Flow Control T e/Descri tion Water Qualit T e/Descri tion ❑ Detention ❑ Biofiltration ❑ Infiltration ❑ Wetpool ❑ Regional Facility ❑ Media Filtration ❑ Shared Facility � Oil Control Oil/water separator � ❑ Small Site BMPs ❑ Spill Control � ❑ Other ❑ Small Site BMPs � i ❑ Other I 2005 Surface Water Design Manual 15559.o03.doc[8/3/06] 1/1/OS 4 K1NG COUNTY, WASHINGTON, SURFACE VVATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR} WORKSHEET Part 15 EASEMENTS/TRACTS Part 16 STRUCTURAL ANALYSIS ❑ Drainage Easement ❑ Cast in Place Vault ❑ Access Easement ❑ Retaining Wall ❑ Native Growth Protection Covenant ❑ Rockery>4' High ❑ Tract ❑ Structural on Steep Slope ❑ Other ❑ Other Part 17 SIGNATURE OF PROFESSIONAL ENGINEER I, or a civil engineer under my supervision, have visited the site. 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'a i '^Q I � �,r � � �9TH S'`�P1L'L�:.� r N� _/1 aSN� J \ Wy � =I =�� f� �� oa P� ,�,� ''1 � St �i 4- car� ° S RDlRJN YILL/GE AR R �� .�: IZid lO[IDM � I�i, IkY � N �Y V' l�H . 5[ Sf �y � � � � N � 6... �t 4 �� ... \ '2 ,cru I �� N 5 E �t A 5T�1 � '� � y4 u C°fTf ,' Q ( 1 o �+ � REFERENCE:Thomas Guide(2006) Scale: FOr: Job Number Horizontal: N.T.S. UeKical: WA ACE AVIATION 15559 GHAV 1821572NDAVENUESOUTH RENTON, WASHINGTON � n► s� KENT,WA 98032 m �? Z (425)251-6222 Title: � s � (425)251-8782 VICINITY MAP ? a� �'�', y' CIVIL ENGINEEF2ING,LAND PLANNING, �T'ro�_M1_,NE�'P SURVEYING,ENVIRONMENTALSERVICES DATE:03/06113 P:U5000s1155591exhibit�.graphic5115559 vmap.cdr I ` � r � , .,.1 . 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': ,.:; ` � � �r tl ,. _ �' � ' � � � .� �r � . . _ - ; . _ � _. .. x ,� # . � - ...� �F i� _ 'S �� 1' ._ �., t� �� . . � - � e �. . �` � � � � _ � s _ _ �_ _�i `� y � i. S'� a + s !-7 L . �_ � . � 5 { e < I ��J� . t "y� 't� �V � �� t r� t* � ; _ }•i' � ' • . c�?' . f e�; �� } • . , � ' ' _ � .� � � � � I K ,�..s. 1A � � . i�� _ �i�i � �1t� � t '�*. ,' � = S,._ �, .. - 3:� � y'_#'.._} 4�g .�I .. s •. . ��' �' ' j i � � � t � : '� _ . �" � * '�� l� � ✓ F� _ r F ��- 44� � ��i{ 1 i�;� �- � � � ,� �` �_ `� - � �-�_��,+ � � `�� .�� .:� v�. .� .� _ � � �� `�{j� � � �.�¢ \ �, 9;r �.. �� '-.'� � � . '�A_� .t e . i .' �S itf �s, . _ .' E a.��II* �t - � , � � .. --. . . .. � ` .�,,@ :� ` ' � . � ' � . : . � SITE—�' �' �, 1 * ` � � � , - � �1 , ' � i�- � �=� � � .� � -� � �� \�.T. . ? � _ � :l _ �, ��._ �� .. . __ _ _ _ � __� �__ � . � . .. . _._ � �,� , - - F . . _ _ : _ �. � _ � � .� _ : , �- - � � � . �-- �k �� ; - . ..�� \',:� � " . ' .� _ , E� ; f�� 3� �----- ° >,�..� ,} < � r j�j' ,�,` :�lr �l �E.�' ��'��5 r,�'' � - '� ,. - . ��_. �� '. 1 � ! /� _ 5 , ` -'� ty � ' !' ; �d � �.+ ` �� I aS . 1 � `� �`��: � �" � =� � �,� �, ,; � _� _ 1, �� o � �� _ .. '�- -� .�'�"�� r¢ � ,i�� t��} � _`f . _ - F � � - _ � � � ',�� `�; ' � �_ } _� _ � q : - f� � � �. _ . _ �� '� ' . �. r� „ , ��-.�� , _ _ , ;_ : A. . � - . � \:_�... .. � �� . . . ... i ��i µ � � i '�. � _._' t �. , � : i . t REFERENCE: USDA, Natural Resources Conservation Service LEGEND: '' Ur =Urban land ' Scale: FOj;• Job Number ' Horizontal: N.7.S. 1/ertical: N/A ACE AVIATION 15559 I �yHA� 1821572NDAVENUESOUTH RENTON, WASHINGTON � �►I s� KENT,WA 98032 m �� Z (425)251-6222 Tltle: � S � (425)251-8782 SOIL SURVEY MAP 0 2 s` ��'•� y, �T �� CIVIL ENGINEERING,LAND PLANNING, DATE:O3IO6I'I3 NC ENG�N� SURVEYING,ENVIRONMENTAL SERVICES P:i 15000s1755591exhibii�graphicsl t5559 soil.cdr 2.0 CONDITIONS AND REQUIREMENTS SUMMARY 2.0 CONDITIONS AND REQUIREMEN7S S�:aF�jli9:a,=�'.` Analysis of the Eight Core Requiremen�� Core Requirement No. 1 — Discharge at the Natural Loca4 ;.- � ' ' - into the same conveyance system it does under existinc immediately adjacent to the project site. Core Requirement No. 2 — Off-Site Analysis: No off-site analysis is required for this pro�ect a: it is an already developed site ard the City is aware of the downstream drainage course from th�� project site. !, _ the project si?� Core Require��ien� i�c. .5 - �iovv �:on�.ro� � n�;�; ��vu� u�; iess �n��,v��uu� �ur1G�c ,or �,'i��c �ru��,_ site after being renovated than there is under existing conditions. Also, since the site lies in thc peak rate flow control standard of the City of Renton, this project is exer, ` :.� � �'- . .�., � runoff leaving the project site is less than there is under existing conditior Core Requirement No. 4—Conveyance System: New roof drains will _ _ __ ._ . __ conveyance system and runoff to the project site should be less than existing conditior redevelopment is complete. A conveyance analysis is included in Section 5.0 of this TI' Core Requirement No. 5 — Erosion and Sediment Control: ESC measures will be f�::_...��_a this project site, including specifying clearing limits and providing perimeter protection along thc downstream perimeter of the project site. Also, catch basin protection being instituted to prevent sediment from being discharged into the downstream drainage course. Bare ground exposure will be very limited at any one time on the project site during construction, due to the fact that this is a re-development project. Core Rec�uirement No. 6 — Maintenance and Operations: This project will concur with all maintenance and operations requirements of the City of Renton. An Operations and Maintenance Manual is included in Section 10.0 of this report. Core Requirement No. 7 — Financial Guarantees and Liabilities: This project will concur with all financial guarantees and liability requirements of the City of Renton for projects of this nature. Core Requirement No. 8 — Water Quality: This project will have less pollution generating impervious surface than under existing conditions. However, water quality will be provided in the form of coalescing plate oil/water separators for treatment for oil prior to discharge into the downstream drainage system, Analysis of the Six Special Requirements: Special Requirement No. 1 — Other Adopted Area-Specific Requirements: This project lies within the City of Renton and must meet their amendment to the 2009 King County Surface Water Design Manual. The project lies within the peak rate flow control standard and is in compliance with this standard. Special Requirement No. 2 — Flood Hazard Area Delineation: This project is adjacent to a flood hazard area for a river; therefore, the flood way is shown on the plan. SpeciaN Requirement No. 3 — Flood Protection Facilities: This project does not rely on an existing flood protection facility, nor is it required to construct a flood protection facility. Special Requirement No. 4— Source Control: Source controls are being applied to this project site by educating the owner about the proper use of pesticides and fertilizers on the landscaping. In addition, this parking lot will be swept up regularly and the trash enclosure will be covered to provide source control protection. 15559.�01.doc Special Requirement No. 5 —Oil Control: To the best of our knowledge, this project site does not exhibit the characteristics of a high-use site. However, oil control is being provided in the form of coalescing plate oil/water separators to treat for oil as required by the City of Renton. Special Requirement No. 6 — Aquifer Protection Area: This project site does not lie within Zone 1 or Zone 2 of an aquifer protection area, therefore, this does not apply. i , , , i � � i � 15559.001 � � � J Q Z a W � V) � � O 0 M 3.0 OFF-�ITE /�NALYSi� No off-site analysis is required for this project site, as the site discharges almost immediately into the Cedar River located across East Perimeter Road. The entire downstream conveyance piping is shown on the project site's grading plan for reference. There are no problems associated with this projecYs downstream drainage course. Runoff discharges from the new oil/water separator through 25 LF of 12-inch PVC to the northwest into a Type 1 catch basin. Runoff then courses northeasterly through 107 LF of existing 12-inch storm drain to a Type 2 48- inch manhole, then again northeasterly through 110 LF of existing 12-inch storm drain to a Type 1 catch basin on the east side of East Perimeter Road. Runoff courses from this catch basin for 20 feet (approximately) directly into the Cedar River. The Cedar River ultimately drains into Lake Washington. 15559.001.doc a a � � . �c 0 � � W � � Q _ � :�,, � � ��. a , `,� , . , 5' , , � � � � � `� � � � � \ `� � � `� C,� �� \�,p� C�` � .; '�,��\ \ %r � � . '��\,J ' i � � � Zi �'y � , m'� � � il.io Qi � �` \ ._., �c. �QI . 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Oo1D ' . � • � Sl� .�G , .r i � � � ±cOp 5 ' � � � � O�pp I � � � a ud s � � ' I ----- - � ='� . � �° :q000 sr �ioo � _ . __________'___'_'-.�__'_'_'__'_' - GiCO pc.g s j � e t ,. . � _'_'_ ' _ ' .j,. . . �_"__' "�.'3O" __ � � „ �r; n.os � �5 � ---- _ , ----,� �`� +n��^Y � — . ._. . __ .._. ' , io� i , �s 4 REFERENCE: King County Department ofAssessments(Jan.2013) Scale: FOf. Job Number Horizontal: N.T.S. VerticaJ: N/A ACE AVIATION 15559 GH'�V 1821572NDAVENUESOUTH RENTON, WASHINGTON � �►► �� KENT,WA 98032 m �� Z (425)251-6222 Title: � s� _ � (425)251-8782 AS S E S S O R MA P s� vI U' �5? CIVIL ENGINEERING,LAND PLANNING, �T'"�c_N��NE�' SURVEYING,ENVIRONMENTALSERVICES DATE:03f06/13 P:115000s1155591exhibitlgraphics115559 amap.cdr � a � z Q J a 0 O O J LL. � � W � FLOODPLAIN Please refer to the attached document indicating that the 100-year flood plain is contained within the river and the project site is located outside of the flood plain. � I _ � � 15559.001 ' { . � � . " . . .. . . - i f , i , tiy4R7�,� ' O/�'��'.y ��° �ederal Eme�gency 1Vlanageme�.t Ag�:ncy � °� � 4s Washington; D.G. 2Q4'72 _ ; �tqNn s��J € � £ �^� � : � � � .. . �� V �W� . . . �.�`_ � 3 Y ? . . . . T"£y'� (` � `�i(?`. .. s � ,. CL'R t ll'�"'1}�v�ti�. ,...4 r .: 'Y�� t RETURI�f RECEII'T REQi7ESTEII ��: V`'�``;� � [ f The Honorable Kaihy Keolker Community: Ciry of Rentan,WA l�iayar,City of Renton Community No._ 530088 10�5 South Grady Way Renton,WA 98057 Dear Mayor KeoIlcer: This respontis to a Letter of Map Revisian(LOMR)request dated June 5,2005(Case No_06-IO-B�69P), from Mr.Ronald Straka,P.E.,Surface Water Utilities Supervisor,Public Works Departmeiit,City of � � Renton,that the Department of�-Iomeland Security's Federal Emergency Management Agency{FEMA} i evaluate the effects that updated flood hazard data for the Cedar River from the confluence with Lake �'Jashington to just upstream of I49th Avenve would have on the flood hazard information shown on the effecrive F�ood Insurance Rate Map(FIRM}for your community. The FIRM panels affected by ttze updated.data include the.folIowing: Panels 53033C066�F,53033C0977 F,53Q33C0981 F, �3033C0982 F,53033C0983 F,and 53033C4984 F. This Ietfer is based oia the best available flood hazard information and is intended to improue npon tliat shown on tl�e effecfive'FIRM. ` ! We reviewed the submitted data enclosed in the application package entitied"Flood Insurance Mapping � Study of the Cedar River,Lake Washiiigton to Rentou City I.imits,"prepared for the City of Renton by � Northwest Hydraulic Consnitants, dated Apri12006,and the undated su�porting report entitled"Technical ; Support Data Notebook(TSDI�for Cedar River,Reuton Washington,"also prepazed by Northwest � Hydraulic Consultants. We have determined that the submitted data meet the m�imum floodplain ; mauagement criteria of the Na#ional Flood Insurance Program{NFII'),but FEMA cannot issue a LOMR or ' Physical Map Revision at this time. i Until such time as FEMA can physically re�+ise the Flood Insuraace Shzdy(FIS)report and FIRM,we j encourage your community to reasonably use the draft work map entitIed"City of Renton Work Map," ` prepared by Northwest Hydraulic Consultants,dated April 7,2€3Qo,as the nest available data for floodpiain � management purposes,in accordance with Paragraph 603(i�)(4}of the NFIP regulations(copy enclosed) ' ana�rloodplain�viauagement i3ulletzn�-98,enritie�"Use of t�loat lnsurance Stucty{�'IS)i�ata as Availabie i Data"(copy enciosed). BulleTin 1-98 provides guidance to communities ou the use of FEMA draft or i preliminary FIS data as available data for regulating floodplain development_ ! i , We are preparing a revised FIRM and FIS report for Kiug County,WasIungton and Incorporated Areas. Preliminary copies of the revised countywide FIRIVI and FIS report will be distnbuted for review in � approximately 8 manths. V�e wilI incorporate the modifications descnbed iaihe aforementioned submitted � data into the Preliminary counfywide FIltM before it is d�striTiuted. ' � � This Ietter,is based on�uinimum floodplaiu managemeut criteria established under the NFIP_ Your � community i.s iesponsible for approving aIi floodplain development and for ensuring all necessaty permits i required by Federal or State law have been received. Sta#e,county,and communify afficials,based on ; � � I f i - t - 2 laiowledge of local conditians and in tize interest of safety,may set higher standards for construction in the Special Fiood Hazard Area,the area subject to inundation by ihe base flood if the State,county,or , ' community has adopted more restrietive or comprehensive floodptain management criteria,these criteria take precedeuce over the minimum NFIP criteria. If you have any questions regarding ftoodplain management regulations for yonr com�nunity or the NFIP in !i general,please contact the Consultation Coordination Officer(CCO)for your community. Informarion on I ihe CCO for your community may be obtained by caIling the DirectQr,F�eral Insurance and MitiDation Division of FEMA in Botheli,Washington,at{425)487-4682. If you have any questions regarding this letter,please call our Map Assistance Center,tolI free,at I-877-FEMA MAP(1-877-336-2627). il Sincerely, I', �,��,�,� E� _ , , Allyson Lichtenfels,Project Engineer Far. William R Blanton Jr.,CF1VI,Chief Engineering Management Secrion Engineering Mauagement Section . Mitigation Division Mitigation I}ivision Enclosures I cc: The Honorable Larry Gossett Chair,King County Council Mr.Ronald Straka,P,E. , Surface Water UtiTities Supervisor I, Public Works I?epartment ' ' City of Renton I Mr.Steve Bleifuhs I Flood Hazard Reduction Services Manager I King County Ivr�r.Eri�P.owlan�,P.E. Project Engineer ' Northwest Hydraulic Consultants i �� ;. , , `/ ,� � � �' � L�A:vhs!nqim � � { . i � ' � � �� , �.,,� J_ ��"� � _r. + _ `��i , �, LYnlofD�IaiIMSNq' c�a'r=��EBOtIN� - . � f� 1 � - -- � �C. � � ; �=�`)�, ��,�h:.�,,_,-� � 4 ,�;� {: 4� �\� �'c' � ' Z0.'It%��1 �\ � ;.��,� ,� ,'rv �.�' , � :, � � ��A �:` � � . ^B 1 '1 .�. �� : � � , ..�._ � � . / �� !t� ' `i ,� 1 S i L' ✓�„ " �,', _ � � 1 ne x(stcae� .,�.__i iti\�;''. 1 � tA r� '�:�,. �`� � � Q _ � ;71 r ? f�. \ 7' �fi � ` i � � �� 1 w.�k�.�a,«,a��.� �i t � � " -ti�1 � LEGE�]D . . �� ,a. �..csb.. /� �; � [ i � — � \ �` qanielf,�M�Ye --� f � Q �a s onr�..m�Fo.. / �' %/ '` �` l �`� `� � Floot+m 6mr�ry (� i 1 � � s! ` Q �i� iwr.aFt�c�,ea,�i � i 1 � ,'t � 1� J \,' � �. � ) 1' t. '.� ...Y sm-r��eo�arr � > �;� .....,..�,..�.,,_.eas��tm e�a�i� / 'f r - � � a /� i � / � , �� A A G�i-S'%�II I . . � o r I � .) ! 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I Zix. �J � 1 /�� r - ' '\/ � � �. � .. . e� �� \ � � J -I r�:�� !� �`x i . � �,� [� (� 1� � � � � LinidSlWy I F: 1 f r � x` � FC / �• o �, L1 Ll� � ' 2onE%ISAadea�• .�rP ' ��.__� _ �:___ , �- � � .-'�,� FeA'skian8�'49e�� ..\ oreAE� n� .fl S�� i� '_}' ._ ` { ZoneM . ,, r .. . C�� ... \-- -__ - ��. . � , � �.� . f � . � ,, `_ . _. ' �� _ . Q .._"'' . • �..-r . ; �� , � '� l ; . r . �� .. , :� . - ' � . _ y �' u _ ' �".' ' - — �. , . . : _. .. :.._ � � � .. . � J- � . 2oru aE �' L� _ FLOOD ZONE DESIGNATIONS osTu�NFa��uTpN Zon�aE Thefbouiiaurance•rskmnevniUicorrty�oMs ��e,00,�.,�a�o��2M��F,�a �a��lalDauunNADB391Wassigton,NmhZ�ne northwest hydraulic consultants inc. City of Renton Washington Zcny M 1F�e 9oaC inwrance rlst mne xtich wnespoNs hY GekikC melAOM1s.BFEs ue slo�vn.ilM bs n�x. Yertical Dalun:IUVJ 68.FI tn areaz outsik IAe SOCyer floadFbn. Zone AH ll��e f6oa insurancx�ax mne anich wrre� 'rerlical Ual�m Conversion:To canrert hdn NSVD 88 n NGVD 23 1 .ure X,Shade� The rbatl Imurance rtst mre wtkn cm3pa�Cs IO InL lOOyEL 110007�iIR5,'N�iCh iR dGkliNlE4 Subtract 35fi Ft Irom WVD BB Elevation. mweasoutsi0eIM1�0-y�rtlooaph�,a�eaz�� k,��.BFE=maY��.��.�. 16300 Christensen Road, Suite 350 1(qy9a shed IIDv 11]odlnp Miere a.2rage d�lhs lhis zo�tis hat Ilooc hqu ol t to 3 Q ar.less INn t foal.arrs�100rn sbem usua0y rXh�reas M Don�p tl��ciry w9e e I e ca�.i[�'irK 7rairac c Fss h3„=,r1eJd s�°„�,�,° ,�,��-� Z��s°��r,, °e, °m=,��E��k��,°�x°°�°s Tukwila. WA 98188 206.241 .6000 Wprk Map Anril 7 �(1(l� PIatP 1 nf �6�:.��lere=�r.c-F:.��s�or.�,xi7t�,��'� ��I 7)�eailiwCcbrsn�ulu'.c'eni.�cr ��. (Z^(q-12 _- _�_. �� ;.,..,,,, ��` DEPARTMENT OF THE ARMY .� +� ''"!��. SEATTLE DISTRICT. CORPS OF ENGINEERS • ;,� �� P. O. BOX 3755 . ;' SEA7TLE, WASHINGTON 98124-3755 �� REP_Y T� •TTENT�ON OF Civil Projects Branch � 3 Q �I Mr. Ron Straka,P.E. Utility Engineering Supervisor 1055 S. Grady Way, Sth Floor FiECE1VE� Renton, WA 98055 OCT � � 2t�!} SUBJECT: Certification of Cedar River Levees GITY OF RENTON UTILflY SYSTCMS Dear Mr. Straka: This letter is in response to a request from the City of Renton that the Corps of Engineers certify that the right lower Cedar River Levee was designed and constructed to contain the 100-yr base flood and that a revision of the FEMA floodplain mapping is justified. The subject levee is a �eWgonent ef the Cedar River S�ctio»2Q5, Rentoa,WashinD on��efinec� in Lhe De±ailed Project Report(DPR), dated June 1997. The lower portion of the project consists of a levee on the right bank of the river and a combination levee/concrete floodwall on the left bank,adjacent to the Renton Municipal Airport. The levee/floodwall portion of the project adjacent to the airpart was constructed to an elevation that is approximately one-foot lower than the levee on the right bank.The left bank structure is designed to overtop without failure, in order to limi#the rise in water surface elevations at the right?e•.-e.,. Water that flows over this structure flows through the airport directly to Lake Washington without returning to the river. In addition ta the structural features, a major element of the project is the requirement for periodic maintenance dredging as defined in the DPR and in the project Operation and Maintenance(O&1V�Manual,dated May 2004. Other O&M requirements prior to an impending flood, and during the flood itself, include sandbagging to specified elevations at specified sites, raising the South Boeing Bridge, and insuring the North Boeing Bridge remains free of debris that would reduce the flow capacity of the bridge. The O&M requirements are the responsibility ofthe City of Renfon as defined in the Froject Cooperation t�greement(PCA), dated 9 May 1998. The project is designed such that the combination of structural features(including the subject levee) and O&M requirements will provide protection against the 100-year flood event at the defined maximum bed profile.Above this maximum bed profile,the bed would need to be dredged to restore 100-year flood event protection. This level of protection is provided with 90% reliability,the accepted standard at the time the project was designed. A review of the construction documentation confirms that the features were constructed as designed.Furthermore,a risk and uncertainty analysis performed using the U.S. Army Coxps of Engineers program HEC-FDA indicates that with the structural and O&M elements,the project provides for containment of the 100-yeaz flood with a minimum reliability of 90%. Therefore,the Corps of Engineers certifies the right bank levee as conta.ining the 100-yr base flood. � Please call me at(206)764-3699 if you have any questions. Sincerely, C �/�' Lester E. Soule Pro�-am Manaaer �2—to,. � � •�� ' DEPARTMENT OF THE ARMY SEATTLE DI5TRICT,CORPS�F ENGINEERS � SEATTLE,W SH NGTON 98124-3755 1��`.r E��C.D i REPLY TO JUI �L ZO12 { � ATTENTIONOF Y � �J�L 3 � 2�lZ � Geotechnical and Environmental Restaration Branch CiTY �}� RENTON II UTILITY SYS7EMS Mr. Ron Straka City of Renton 1055 S Grady Way Renton,Washington 98055 Dear Mr. Straka: This letter is to inform you that the levee certification(evaluation) letter provided to FEMA and the City in 2004 for the Cedar River(Le$and Right Bank)Fload Control Project will be considered invalid by the US Army Corps of Engineers (USACE)on August 31,2013. This change in status is a result o�revisions to Engineering Circular 1110-2-6067,USACE PROCESS FOR THE NATIONAL FLOOD INSURANCE PROGRAM (NFIP) LEVEE SYSTEM EVALUATIOI`T which was finalized on August 31, 2010. This publication was developed to guide USACE procedures for levee system evaluations in support of the NFIP as administered by FEMA. Prior to the revision of the Engineering Circular, USACE assisted FENiA in evaluating levees for design and construction issues to support FEMA's efforts in the Flood Map Modernization Program that started in 2003. As part of that program, specific definitions and requirements were identified that allowed USACE to make levee system evaluations in support of the NFIP. In some cases,USACE is on record with FEMA for a positive NFIP levee system evaluation that is comprised of only a letter or a letter with incomplete dacumentation. Under these circumstances,rhe revised Engineering Circuiar requues that USACE notify the levee sponsor and FEMA that USACE can no longer remain on record as providing a positive NFIP levee system evaluation. Since the evaluation of your levee system was based on data available at the time and was completed before the publication of the Engineering Circular, the 2004 certification letter rvill expire next year. The EC also limits USACE ability to perform levee evaluations for non-Federal sponsors due to funding constraints. Evaluations can be performed on a cost reimbursable basis,but that approach is generally unavailable since there are private Architect-Engineering(A-E)firms that are capable of performing the evaluations in accordance with FEMA requirements. It is our recommendation that you pursue an updated certification through an A-E firm if you wish to continue to have your levee accredited in the NFIP. � / � � -2- Further communication between the Corps of Engineers,FEMA Region X and yourself is planned to clarify issues relating to this development. For additional information,please contact me at(206) 764-3776 or Dennis Fischer of my staff at(206) 764-3555 or via email at dennis.a.fischer(�a usace.armv.mil. Sincerely, � /''�'1�.,�.' l Mark A. Ohlstrom, P.E. Chief, Engineering Division ' Seattle District,Corps of Engineers O�e 4��F`U j�� NATIONAL FLQOD INSURAI�ICE �R,OGRAM � . -�. � FEMA NATIONAL SERVICE PROVIDER . o'iF,tQND S�GJQ- December 4, 2006 Iv1�-. Ronald Sn-aka,P.E. IN REPLY REFER TO: � City of Renton - ,--�_�,:;�-�.: Case No.: 06-10-B569P Public Works Department - -��- - - -- - Community: City of Renton, WA 1055 South Grady Way � ---� : ._. Community No.: 530088 Renton, WA 98055 L L`' ry `� " -, ; C:. , �:.-.-._.,. ,_ 316-ACK ��?:_�i', ,_.��.-_. ._ Dear Mr. Straka: �, This responds to your submittal dated No�ember 17,2006,conceining a June 5,2006,request that the I Department of Homeland Security's Federal Emergency Management Agency(FEMA)issue a revision to the Flood Insurance Rate Map(FIRM)for King County,Washington and Incorporated Areas. Pertinent information about the request is listed below. Identifier: Cedar River LOMR FIooding Som-ce: Cedar River FIR'�1 Panel(s}Affected: 53033C0664 F,0977 F,0981 F, 0982 F, 0983 F and 0984 F �,�,'e have completed an inventory of the items you submitted. Our review of the submitted data indicates we have the minimum data required to perform a detailed technical review of your request. If additional data are required or if delays are encountered, we will inform you widiin 60 days of the date of this letter. �s you may know, FEMA has implemented a procedure to recover costs associated with reviewing and processing requests for modifications to published flood information and maps. However,because your request is based on flood hazard infonnation meant to improve upon that shown on the flood map or�vithin the flood study and does not partially or wholly incoiporaie maiunade modifications within the Special Flood Hazard Area, no fees will be assessed for our review. Piease direct questions conceinin�your request to us at the address shown at the bottom of this page. For identification pu'tposes,please include the case nuinber referenced above on all correspondence. If you have general questions about your request, FEMA policy, or the National Flood Insurance Program, please call the FEMA Map Assistance Center, toll free, at 1-877-FEMA MAP(1-877-336-2627). If you have specific questions concerning your request,�lease call the Revisions Coordinator for your State, Ms.Jennifer VJinters, �,�ho may be reaciled at(720)�14-1 i 07. Sincerely, Sheila M.Norlin, CFM ', National LOMC Manager Michael Baker Jr., Inc. cc: Mr. Erik Rowland, P.E. Project End neer �Iorthwest Hydraulic Consultants 3601 ErsenirowerAvertue,Alexandrra,V!�22304-6425 rii:i-BT-F�II�iA i�SAP FX:7Q3.360.5J25 i he�viapping on Demand Team,under contract with the Federal Emergency P.9anage�nent Agency,is the , idationai Service Frovide�iDi iil0 �rnil0ii'o�civOu i[i5ui'aiiCB�iLlyia� O�YI��'•[• '� ��° Federal Emerge�cy 1Vlanagemen� Ag�ncy x � �- � Washin on, D.C. 20472 o� � � �t`qND StiGJ -- '."' = ";`-= ,.�� FEB I 6 Z007 �_`4 ~ `:��;� --� � . .,� . - . eEx��D�. . . -�:�= -..=:��s:��:� : �..: - i�.rl.j RETURN RECEIPT REQLTESTED ;�.` `-`,`,,�t>, ._ The Honorable Kathy Keolker Community: City of Renton,WA Mayor, Ciry of Renton Community No.: 530088 1055 South Grady Way Renton,WA 98057 Dear Mayor Keolker. This responds to a Letter of Map Revision(LOMR)request dated June 5, ZOQ6(Case No.06-10-B569P), from Mr. Ronald Straka,P.E., Surface�Vater Utilities Supervisor,Public Works.Department,City of Renton,that the Department of Homeland Security's Federat Emergency Management Agency(FEMA) evaluate the effects that updated flood hazard data for the Cedar River from the confluence with Lake Washiugton to just upstream of 149th Avenue would have on the flood hazard information shown an the effective Flood Insurance Rate Map (FIR1V�for your community. The FIRM panels affected by the . updated data include the following: Panels 53033C0664 F,53033C0977 F,53033C0981 F, 53033C0982 F, 53033C0983 F, and 53033C0984 F. This letter is based on the best available flood hazard infoimation and is intended to improve upon that shown on the effective�'II�M. We reviewed the submitted data enclosed in the application package entitled"Flood Insurance Mapping Study of the Cedar River,Lake Wasl�ington to Renton City Limits,"prepared.for the City of Renton by Northwest Hydraulic Consultants, dated Apri12006, and fhe undated supporting report entitled"Technical Support Data Notebook(TSDN} far Cedar Itiver,Renton Washington,"a1�prepared by Northwest Hydraulic Consultants. We have determined that the submitted data meet the minimum fioodplain management criteria of the National Flood Insurance Program(NFIP),but FEMA cannot issue a LOMR or Physical Map Revision at this time. � + Until such time as FEMA can physically revise the Flood Insurance Study(FIS)report and FIlZM,we encaurage your community to reasonably use the draft work map entitled"City ofRenton Work Map," prepared by I�Iorthwest Hydraulic Consultants,dated Apri17,2000,as the best avaiiable da.ta for floodpiain mana.gement puiposes,in accordance with�'aragraph b03(b)(4)of the i�1FIF regulations(copy enclosed) and�Floodplain Management Bu�letin 1-98, entitled"Use of Flood Insurauce Study(FIS)Bata as Available Data"(copy enclosed). Bulletin 1-98 provides guidance to communities on the use of FEMA draft or preliminary FIS data as available data.for regulating floodpiain development. We are preparing a revised RIRM and FIS report for King County,Washington and Incorporated Areas. Preliminary copies of the revised countywide FIRM and FIS report will be distnbuted.for review in apgm�imately 8 months. We wi11 incorporate the modi�caiions descnbex.i�the��orementioned suLmi��e� data into the Preliminary countywide FIRM before it is distributed. - This letter is based on m�nimum floodplain management criteria established under the RTFIP. Your community is responsible for appraving alI floodplain development and for en�?ring all necessary permits required by Federal or State law have been received State, county,and cammt�nity officiats,based on 2 � knotir�ledge of local cor�ditions and in tlie interest of safety,may set higher standards for constntction in the Special Flood Hazard Area,the area subject to inundation by the base flood. If the State, county,or community has adopted more restrictive or comprehensive floodplain management criteria,these criteria take precedence over the minimum NFIP criteria. . If you have any questions regarding floodplain management regulations for your community or the N�IP in general,please contact the Consultation Coordination Officer(CCO}for your community. Information on the CCO for your community may be obtained by calling the Director,Federal Insurance and Mitigation l�ivision of FEMA in Botheil, Washington, at(425)487-4682. If you have any questions regarding t}iis letter,please call our Map Assistance Center, toll free,at 1-877-FEMA MAP(1-877-336-2627). � Sincerely, ��"� E'` Allyson Lichtenfels,Project Engineer For: William R Blanton Jr., CFM, Chief Eng-ineering Management Section Engi.neering Management Section . Mirigation Division Mitigation Division EncIosures cc: "The Honorable I.arry Gossett Chair,King County Council Mr.Ronald Straka,P.E. � SurFace Water Utilities Supervisor Public Works Department City of Renton Mr. Steve Bleifuhs I Flood Hazard Reduction Services Manager ' King County - ; Mr. E�Rowland,P.E. I, Proje:t Engi�eer ! Northwest Hydraulic Consultants I Ali Sadr From: Dan Balmelli Sent: Friday, March 08, 2013 12:32 PM To: Ali Sadr Subject: FW: Ace Aviation meeting with Renton Pls print in colc Dan Balmelli Executive Vice President (206)396-8588 cell Barghausen Consulting Engineers, Inc. 18215 72nd Avenue South Kent, WA 98032 (425)251-6222 - Phone (425)251-8782 - Fax htt�://www.barghausen.com --------------------------------- From: Dan Balmelli Sent: Thursday, December 13, 2012 9:08 PM To: 'David Freeman' Cc: File Subject: RE: Ace Aviation meeting with Renton Hi Dave,the meeting with the city went very well. It was attended by Vanessa, Ron and Arneta. The main purpose of the meeting was to discuss issues related to the FEMA 100 year Floodplain and specifically the issues listed below. I have added the responses to each question in red below based on my meeting with City staff. 1.What version of the FEMA maps is Renton going to use for review of this project,the current adapted,the proposed draft or the King County flood study?The city confirmed they will be reviewing the project based on the 100 year flood maps with was based on a study Renton had completed by NHC which shows that the 100 yr flood is contained within the Cedar River.The city refers to this flood map as the D map.The city has received a letter from FEMA agreeing with the resufts of the flood study and use of the D map as the best available information. 2.Based on the version used,what are the impacts to the project and what are the resulting project requirements. Based on the citys confirmation that they will be reviewing the project based on the D map,the site does not contain any flood plain and therefore will not be subject to compensatory storage requirements or the requirement for a biological assessment. 3. How is the city addressing the existing floodwall levee relative to the flood plain?Is it considered certified? Based on the citys determination to utilize the D map,the existing floodwall is considered to be certified.The city has received a letter from the Corps of Engineers indicating that new levee regulations are planned to be adapted in August of 2013 which could result in the existing floodwalls being decertified. If this occurs,the city would most likely go thru the process to recertify the flood�vall. � 4. What specific conditions and requirements will app{y to this project since the buildings are existing and it is located on airport property?The city is not anticipating that the Ace Aviation project will be subject to any specific conditions or requirements.They are however recommending that the finish floor elevation of the new building be set no lower than the existing building to remain and if possible, increase the finish floor as much as possible to be as high as possible a��cv�� ti�e ilcodplain con�ained �viihin the e:��isting lev�e ,Vs�em. Pl�ase review the above infom�ation and let me kno�uv i�y��u hav� an�� ue�stions or v�rculd lik�to ciscu�s in �urther d�tail Thanks --------------------------------- Dan Balmelli Executive Vice President (206) 396-8588 cel Barghausen Consulting Engineers, Inc. 18215 72nd Avenue South Kent, WA 98032 (425) 251-6222 -Phone (425) 251-8782 - Fax http://w�i-�v.barghausen.com From: Dan Balmelli Sent: Friday, December 07, 2012 3:49 PM To: David Freeman Subject: RE: Ace Aviation meeting with Renton Hi David, I have a meeting confirmed with the city this coming Monday at 3pm. Let me know if you can attend, if not, I will give you a summary after the meeting. Thanks --------------------------------- Dan Balmelli Executive Vice President (206) 396-8588 cell Barghausen Consulting Engineers, Inc. 18215 72nd Avenue South Kent, WA 98032 (425)251-6222- Phone (425)251-8782- Fax http://www.barghausen.com --------------------------------- z - i � arrsrur�� ` 2� ' f � 0� L E G E N D I � � � � �- , ��:- , � � . i :. lI � � � SPECIAL FLOOD HAZ�IRD AREiS INUVD;\TtD '. i ' ^ �''� B}' 10o-YE4R FLOOD � t, ,� � � . t:� -�v� ZONE A V��I,.'�c tbkul�dctiaiv�n. It rmmtrl . � � ��.'. �� t ZONE AE Rn�i ��d ra•�xn„ns�Iri�� n�Yl. � r'"� CTHER FCOOD AREAS � �. � L_� zotve x a�`as a suo-�r��no�d:a � x . Z diu�d wn4 a�rraRc ��xh ( kss i. .. � ��_ �,� I f«,t o wrth d*ainege Ie�s an �, �: ��V �� , i I .y.i a r er m i l c: anA ar e- prot c r t ed�hY � , �� .� � s i.�m tOf�ycar flnid. ggg � OTHER �.REAS - g � , ..� ZONE X as deicrm�ned to Se ewside 5[�y¢�ar �� P :�dpla n. 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L „ � s � ,� - ; - : m 1 a I : ;. . � ,�. 4.-� . _ � �: � - _ . ,_, � V� :, !�• �- : .. � �� :�: �� ' �`�� _ � �__� . . � i d° �_ �� ' �� , �, � ' REFERENCE: King County iMAP(2013) � Scale: F�r: Job Number ', Honzontal: N.T.S. VerScal: N/A ACE AVIATION I ¢GHa Vs 15559 1821572NDAVENUESOUTH RENTON, WASHINGTON � �►I� F KENT,WA 98032 li m � �� Z (425)251-6222 Title: � ` : � (425)251-8782 TOPOGRAPHIC �i i e� ,U g' CIVIL ENGINEERING,LAND PLANNING, MAP �r'ti�EN�,KE�� SURVEYING,ENVIRONMENTALSERVICES DATE:03l06113 P:1150GOsi95559iexhibit'�oraphics195559 topo.cor i ; � 1 `i - -� � - ) j 1 '� _ °� _ l :--� � � 7 .. � ; ., 4.0 FLOW CONTROL AND WATER QUALITY ! FACILITY ANALYSIS AND DESIGN 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN A. Existing Site Hydrology Under existing conditions, runoff from pollution generating impervious surfaces drains to an existing oil/water separator. The existing total project site has only 820 square feet of landscaping, most of which will be replaced and additional landscaping will be added with the redevelopment. Most of the site consists of impervious surface under existing conditions. Please refer to Section 1.0 of this report for a complete description of the land coverage being modified on the project site. The remaining areas are all impervious surface. B. Developed Site Hydrology Under developed conditions, there will be 2,064 square feet of new landscaping, with 4,340 square feet of new sidewalk. A new approximately 20,748 square foot building will be constructed and wash water runoff from inside the building will be directed to an exterior oil/water separator draining to the existing sanitary sewer system off site. Runoff from outside the building will be collected and routed to a new oil/water separator prior to discharge to the downstream conveyance system. C. Performance Standards The area-specific flow control standards determined from the City of Renton Flow Control Applications Map is the Peak Rate Flow Control Standard matching the existing conditions. Flow control is not required since the proposed project is discharging less runoff under proposed conditions than under existing conditions. The applicable conveyance system capacity standards are not applicable as the entire site is being conveyed adequately under existing conditions and the proposed project will have less impervious surface draining to the existing conveyance system. The applicable land use-specific water quality requirements are to provide oil control for water quality. D. Flow Control Systems As mentioned previ�usly, flow control is not a requirement for this project site. E. Water Quality Systems As mentioned previously, oil control will be the method of providing water quality so that a coalescing plate oiUwater separator will treat runoff from outside the buildings pollution generating impervious surface. In addition, an oil/water separator will be provided to treat runoff from the wash down area inside the buildinq prior to discharge to the sanitary sewer. 15559.001 i BASIN MAP FOR EXTERIOR OIL/WATER SEPARATOR SIZING � ; '�� PRELIMINARY GRADING AND STORM DRAINAGE PLAN � a I� � � � � �cy,`� �fl N �°�' _�$�; �' ��, � ACE AVIATION ��1� �� . �. � o ,s ao eo �'�'� =-�,�� NE 1/4 OF THE NE 1/4 OF SEC1lON 18, TWP. 23 N., RGE.5 E., W1ul. �(,r��j��! ss.a�,-a-. � F_,..<z';2.�`�i � ' ':,,. \\\�� CRY OF RENTON,KING CAUNlTY, WASI-YdNGTON �D� �0 :z O�� ` �� . � �D, �_,�.��;�.•� '�`�. .� �\, ., � � R��, P� � � � � � � � a l�\\\ �s�cN �� g ,�� ''� ��. �� Z�a$ �� ' � �°";- ° +'.� ��. ., o�� z� -:ooa j' <+' � �;� �,..��, ��j 3 ¢`a Z�*�� y � r`` ` / '�\'��''} ce-� (7 � /,Dr,,,� 2� i � ` �� `. a�Z Q ¢ .�-__.- ..: --- ->s--�— 4'� � r.,`. 2b.4 ��\\'�'y� e' uJ Q �o'W :�E' � �—�0— „. __ -_'> . 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WN.L ON I �1 •\� 3,p� \ ' \ �' �-�C 6. �^ BRIDGE J-90% \ '�� o .,,/,r.. �� / c \ ➢� 't 1 ' � ••. � ,.�' , � � I�', Pr� _ � I �� \�t 1 .� \ C �`.r I SiREEf O "VN-A r\ ' � � UG/1T � � � � �A � ; � �� .��? � ��' !� _..� :'�,.1 1 ��: . CITY OF RENTON � �.� PROFLIGHT AYIATION, INC. �EPARTMENT OF PUBLIC WORKS ' z+3 w. �ai��Ko�o G H A(/ K.8q� F$NTON,Wp 9&155 � � � PRQ.��/��'(�1��D I q�C1�DFORC��ntacE �```y�eas (azs)zza-ss�o mP �►', �Z STORMDRANAC�PLAN � � � TO CRY STMIDAFID3 OP!`,` �,ni � CONUCT: BERNIE pt DNNE PAHOLKf I . 3! BVtQW15QJ CONSUL7ING ENqNEFRS o�� !-_.� � oE'ialm AS ACE AVI1UlON O ' 18215 72ND AYEWUE SDUiH u � Date ' i . � = oare o3/os/+s ��+o. "� ' 3Y f � 25672 Eo '..� KEHf.WA 98032 'j'� � y' OMnN �1" � Date �f��S7EP G�Q�`' (4?5)251-6222 �TiN 0�� asac:n DKB scaF 1'=3C' Fsoeoac rac�_ W 1 Z � �M�AL EN (425)251-8782 FAX C ENG�N �r] U u . Date WNfACT:DAN BALAIEW �`°�°� S�r w °F- 5 m P•\15QOOs\15559\nreliminarv\15559-nam.dwa. 3/7/2013 1:48:50 PM, \\MERCURY10ce TD5700 - main CAD � OIL/WATER SEPARATOR SIZING FOR TREATING STORMWATER RUNOFF KCRTS Command CREATE a new Time Series ------------------------ Production of Runoff Time Series Project Location : Sea-Tac Computing Series : 155590WSdev.tsf ' Regional Scale Factor : 1.00 Data Type : Reduced Creating 15-minute Time Series File Time of Concentration (13 .518) exceeds maximum (10 . ) for EI Loading Time Series File:C: \KC_SWDM\KC_DATA\STEI15R.rnf . Flow Path: Length 380 . 00 ft @ Slope 0. 0050a0 Impervious 0.73 acres -------------- Total Area : 0.73 acres Peak Discharge: 0 . 861 CFS at 6:30 on Jan 9 in Year 8 Storing Time Series File:155590WSdev.tsf . Time Series Computed KCRTS Command Enter the Analysis TOOLS Module ------------------------------- Analysis Tools Command Compute PEAKS and Flow Frequencies ---------------------------------- Loading Stage/Discharge curve:15559owsdev.tsf . Flow Frequency Analysis Time Series File: 15559owsdev. tsf Project Location:Sea-Tac Frequencies & Peaks saved to File:155590WSdev.pks . Analysis Tools Command ---------------------- _ RETURN to Previous Menu ----------------------- KCRTS Command eXit KCRTS Program � Flow Frequency Analysis 'I'ime Series File:15559owsdev. tsf Froject Location:Sea-Tac ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flocv Rate Rank Time of Peak - - Peaks - - Rank Return Prob (CFS) (CFS) Period /�o �� 0 .348 6 8/27/01 18:00 0. 861 1 100 . 00 0 . 990 �---� G .243 8 9/17/02 17:45 0. 658 2 25 .00 0 .960 -�(p� QGi,� G . 658 2 12/08/02 17:15 0.472 3 10.00 0 .900 � .280 7 8/23/04 14:30 0. 388 4 5 . 00 0. 800 � . 368 5 10/28/04 16:00 0. 368 5 3 . 00 0. 667 0 . 388 4 10/27/05 10:45 0. 348 6 2 .00 0 .500 0 .472 3 10/25/06 22 :45 0.280 7 1 .30 0 .231 � � 0 . 861 1 1/09;08 6: 30 0 .243 8 1 .10 0 .091 �� Co_nputed Peaks 0 .793 50 . 00 0 . 980 _ �� .� 7.�5' �I � �°�� ,,�K� _ �og �PM w�. �- � � �� {� - !�o g�� ,.�� = �� PM � ` '�.`� t�i'''�5 '`''��1 ` �-, �`� !�, �%(�- Jl�b "�PS L�hIeS�-�� ;� of ��'� � ,� �� M��J�►�M �-.�t�,r�l"� �8�! � � �� ,o�ss ��w r�� a-f �ya y�� - OIL/WATER SEPAR�►TOR SIZIIVG FC�� 'REA ' ' ' WASH WATER FROM INSIDE BUILDIN� _ ; SIZE TFIE 01NS�REA�ING WASHWATER �ROM INSID� THE BUILDING Assume 3/4-inch diameter hose flowing 10 fps , Flow rate =[(0.75-inch/2)2(I�/(144)] 10 fps =0.0307 cfs �I _ (0.0307cfs)(7.48 g/cf)(60-second/minute) = 14 gpm Assume 2 hoses operating at one time (2)(14) =28 9Pm Select OWS to have 20-minutes minimum residence time Utility Vault 577-SA has 800-gallon capacity, therefore, 285 minute residence time, So OK 15559.001 i � i $ I ��-�� 5.0 CONVEYANCE SYSTEM ANALYSIS AND �� DESIGN 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN As mentioned previously, conveyance is not an issue for this project site, as there is already an existing conveyance system that will be utilized under proposed conditions on the site with less runoff draining to it. However, conveyance calculations were performed on the new conveyance pipes that are being added and the calculations and basin map are on the following pages of this report, The modified rational method per the 2009 KCSWDM was the model used with an initial time of concentration of 6.3 minutes, a Manning's `n' value of 0.014 and a 25-year precipitation of 3.4 inches, All pipes conveyed the flow contributing to them. 15559.001.doc PIPE CONVEYANCE BASIN MAP � i ' GRADING AND STORM DRAINAGE PLAN � � � a ~ � � i � � �;� r-oR G pn1�E'��1 t� N \``�� }-�— �� ' �;��., ACE AVIATION P�l��n� ,,,,.,a-P , �� a �-., o ,s ao eo �uH-B �'�� ,�.� 1�1/4 OF TI-�NE 1/4 OF SECTION 18,?WP. 23 N, RGE. 5 E,WM a I_�;6.42�124?SA� �' � `„_ . \�� CRY OF RENTON, K1NG COUNTY, WASITYVGTON `\\ -./ +,�Y/O f ie��a2�;z4's��\ \ ��\\ �� 1 �� \\\,� `��is� Z Q� � \ I ik�'�m �y \ � � I \\\� �, / U°RC "s \ ��' S3T18'36'E � ��j 0 a � � d�•ry `/� \��4. 52.33 F�Q zd' C� ,�aOO r �� / ��, J ,�S'� \ �v.ae S 3 o z � �� `� �• �� '� � � �-��s•sn Z i � � . �: h. � �-m.�e e•� a� a c � ss�— � ��, �=26.58(NE7Y 8"SW) m � Q� r�EID LOCATE IX. 12' '2" _y— 'y - - \�\�.p � W� � sro�u awo insrsu.: `keo"�'zo,,�, � �� f� � �` ��;�� z3�r a'w+c �% '� Q�� w/a�Tu�ioc�n�o �0"t'{j��- �� `� >30• ��, � so e w�ee�c-�.0 g �� RIA1 = . \\J �N s ' /�y. . � \ � ��.�'; GEN71PE1 N (6l4TCH Df.GRADE) �r�rf� �� ,� �.\\�; W180LD LOCYJq LD / � ,c�_ '� PoH = 31.60 y� (FIELD VEPofY'PPoOR � `-x�7� I/� r � ,� ��`' T�� \ �_�Tr�8 SE� J/�0.� ro wsra_unori) a,��p�/ c� �;�a��`` ''` . . � `�y �C\ tE - P6�71 �8.�') 1rb aowRo / �'y°+c�' . 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(425)251 6222 Tj � ��c a�ac� DF9 sc.uE ��_�� r��eoac P�_ � ; Z � ��h',tL �N�' (425)2i1-8782 FfJ( h�ENG�N = oaca coti-rncs: c,w ea;�y 'rP"0`� -- - s�r a oF 6 PIPE CONVEYANCE CALCULATIONS 15559-25.x1s 6ARGHAUSEN CONSULTING tNGINEERS-PIPF FI OW CALCULATOR usiny ihe Rational Method 8 Manning Formula KING COUNTY DESIGN FOR 25 YEAR STORM , JOB NAMF: ACC AVIATION NOTE ENTER DEFAULTS�ND STORM DATA BEFORE BFGINNING I JOE3#: 75559 DEFAUI TS C= 0.9 n= 0.014 � FILE NO.:15559-25.XLS d= 12 Tc= 6.3 A=Contributing Area(Ac) �d=Design Row(cfs) COEFFICIENTS FOR THE RATIONAL METHOD'9r"-EQUATION �, C=Runofi Coeflicienl Qf=Full Capacity Flow(cfs) STORM Ar Br I Tc=Time of Concentration(min) Vd=Velocity at Design Flow(fps) 2YR 1.58 0.58 ! 1=Intensity at Tc(in/hr) Vt=Velocity at Full Flow(fps) 70YR 2.44 0.64 PRECIP= 3.4 d=Diameler of Pipe(in) s=Slope of pipe(%) 25YR 2.66 0.65 Ar= 2.66 1.=Length of Pipe(fQ n=Manning Roughness Coefficient 50YR 275 0.65 Br= 0.65 D=Wator popth at Qd(in) Tt=Travel Time at Vd(min) 100YR 2.Fi1 0-63 FROM TO A 5 L d Tc n C SUM A A'C SUM A'C I QA Qf �dlQf D/d D Vf Vd Tt ------ ------ ------ ------ ------ --------- ----- ------ ------ ----- -------------- ----- ---- ..---- ------ '----- ------ ----- --� � CBN C83 0.96 0.50 43 12 6.3 0.014 0.9 0.96 0.86 0.86 2.73 2.36 2.34 1.010 0.827 9.92 2.98 3.37 0.'li C83 OWS 0.00 0.50 58 12 6.S 0.014 0.9 0.96 0.00 0.86 2.68 2.31 2.34 0.989 0.807 9.68 2.98 3.37 U.2J OWS CD4 0.00 0.50 25 12 6.8 0.014 0.9 0.96 0.00 0.86 2.60 225 2.34 0961 0761 9.37 2.98 3.37 0.17 C82 CB1 0.30 0.40 61 tl (i.3 0.014 0.9 0.3 0.27 0.27 273 0J4 0.71 1.041 0.868 6.92 2.03 2.30 0.44 CB1 EXCB 021 1.04 23 8 (i./ 0.014 0.9 0.51 0.19 OA6 2.62 120 1.14 1.050 0.875 7.00 3.28 3.71 0.10 Payc 1 6.0 SPECIAL REPORTS AND STUDIES 6.0 SPECIAL REPORTS AND STUDIES There are no known special reports and studies to the best of our knowledge. � � � G � W a oc W _ H O 0 � � � 7.0 OTFiER PERMITS Other permits for this project include a Right-of-Way Use Permit, Commercial Building Permit, Clear and Grade Permit, Waterline Extension Permit, and Sanitary Side Sewer Permit. 15559.001 8.0 CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN ANALYSIS AND DESIGN Stormwater Pollution Prevention Plan For � Ace Aviation Site Modifications Prepared For Ace Aviation, Inc. 289 East Perimeter Road Renton, WA 98057 Owner Developer Operator/Contractor Ace Aviation, Inc. Ace Aviation, Inc. TBD 289 East Perimeter Road 289 East Perimeter Road Renton, WA 98057 Renton, WA 98057 Project Site Location 289 East Perimeter Road Renton, Washington Certified Erosion and Sediment Control Lead TBD SWPPP Prepared By Barghausen Consulting Engineers, Inc. 18215 - 72nd Avenue South , Kent, WA 98032 (425) 251-6222 a r �,i Gdr, ��;io� ��ojee� ��C�.II ICC� SWPPP Preparation Date March 8, 2013 Approximate Project Construction Dates May 2013 October 2013 ; I , � --, I 15559.004 Stormwater Pollution Prevention Plan Contents 1.0 Introduction..................................................................................................................... 1 2.0 Site Description...............................................................................................................3 2.1 Existing Conditions..............................................................................................3 2.2 Proposed Construction Activities .........................................................................3 3.0 Construction Stormwater BMPs ......................................................................................4 3.1 The 14 BMP Elements.........................................................................................4 3.1.1 Element#1 — Mark Clearing Limits .........................................................4 3.1.2 Element#2— Establish Construction Access..........................................4 3.1.3 Element#3 —Control Flow Rates............................................................5 3.1.4 Element#4— Install Sediment Controls ..................................................5 3.1.5 Element#5 — Stabilize Soils....................................................................6 3.1.6 Element#6— Protect Slopes...................................................................7 3.1.7 Element#7 — Protect Drain Inlets............................................................7 3.1.8 Element#8—Stabilize Channels and Outlets .........................................8 3.1.9 Element#9—Control Pollutants..............................................................8 3.1.10 Element#10—Control Dewatering .........................................................9 3.1.11 Element#11 —Maintain BMPs.............................................................. 10 3.1,12 Element#12—Manage the Project....................................................... 10 3.1.13 Element#13—Construction Stormwater Chemical Treatment.............. 12 3.1.14 Element#14—Construction Stormwater Filtration ................................ 18 3.2 Site Specific BMPs ............................................................................................ 19 4.0 Construction Phasing and BMP Implementation............................................................20 5.0 Pollution Prevention Team ............................................................................................21 5.1 Roles and Responsibilities.................................................................................21 5.2 Team Members .................................................................................................22 6.0 Site Inspections and Monitoring ....................................................................................23 6.1 Site Inspection...................................................................................................23 6.1.1 Site Inspection Frequency.....................................................................23 6.1.2 Site Inspection Documentation..............................................................23 6.2 Stormwater Quality Monitoring...........................................................................24 6.2.i 7urbidity Sampling ................................................................................24 6.2.2 pH Sampling .........................................................................................25 7.0 Reporting and Recordkeeping.......................................................................................26 7.1 Recordkeeping ..................................................................................................26 7.1,1 Site Log Book .......................................................................................26 7.1.2 Records Retention................................................................................26 7.1.3 Access to Plans and Records ...............................................................26 7.1.4 Updating the SWPPP............................................................................26 7.2 Reporting............................................................................................. .....27 7.2.1 Discharge Monitoring Reports...............................................................27 7.2.2 Notification of Noncompliance...............................................................27 II 15559.004 Stormwater Pollution Prevention Plan Appendix A Site Plans Appendix B Construction BMPs Appendix C Alternative BMPs Appendix D General Permit Appendix E Site Inspection Forms (and Site Log) Appendix F Engineering Calculations ,o I I I 15559.004 _ � Stormwater Pollution Prevention Plan ' 1.0 Introduction I This Stormwater Pollution Prevention Plan (SWPPP) has been prepared as part of the ' NPDES stormwater permit requirements for the Ace Aviation Site Modification project in i Renton, Washington. The proposed site is located at 289 East Perimeter Road, Renton � Municipal Airport, Renton, Washington. I Construction activities will include the demolition, modification and reconstruction of buildings, asphalt parking lots, landscaping, utility work, including power, telephone, gas, cable tetevision, water, sewer, and storm appurtenances with catch basin collection, pipe conveyance, and stormwater quality facilities, etc. The purpose of this SWPPP is to describe the proposed construction activities and all temporary and permanent erosion and sediment control (TESC) measures, pollution prevention measures, inspectionlmonitoring activities, and recordkeeping that will be implemented during the proposed construction project. The objectives of the SWPPP are to: 1. Implement Best Management Practices (BMPs) to prevent erosion and sedimentation, and to identify, reduce, eliminate or prevent � stormwater contamination and water pollution from construction ' i activity. ' 2. Prevent violations of surface water quality, ground water quality, or ! sediment management standards. 3. Prevent, during the construction phase, adverse water quality impacts including impacts on beneficial uses of the receiving water by controlling peak flow rates and volumes of stormwater runoff at the Permittee's outfalls and downstream of the outfalls. This SWPPP was prepared using the Ecology SWPPP Template downloaded from the Ecology website on July 2, 2005. This SWPPP was prepared based on the requirements set forth in the Construction Stormwater General Permit, Stormwater Management Manual for Western Washington(SWMMWW 2005). The report is divided into seven main _ sections with several appendices that include stormwater related reference materialc. Tn� topics presented in the each of the main sections are: ■ Section 1 - INTRODUCTION. This section provides a summary description of the project, and the organization of the SWPPP document. ■ Section 2 -SITE DESCRIPTION. This section provides a detailed description of the existing site conditions, proposed construction activities, and calculated stormwater flow rates for existing conditions and post-construction conditions. ■ Section 3 -CONSTRUCTION BMPs. This section provides a detailed description of the BMPs to be implemented based on the 12 required elements of the SWPPP (SWMMEW 2004). 1 15559.004 Stormwater Pollution Prevention Plan • Section 4 — CONSTRUCTION PHASING AND BMP IMPLEMENTATION. This section provides a description of the timing of the BMP implementation in relation to the project schedule. ■ Section 5— POLLUTION PREVENTION TEAM. This section identifies the appropriate contact names (emergency and non-emergency), monitoring personnel, and the onsite temporary erosion and sedimentation control inspector ■ Section 6— INSPECTION AND MONITORING. This section provides a description of the inspection and monitoring requirements such as the — parameters of concern to be monitored, sample locations, sample frequencies, and sampling methods for all stormwater discharge locations '� from the site. �, ■ Section 7 — RECORDKEEPING. This section describes the requirements �i for documentation of the BMP implementation, site inspections, , monitoring results, and changes to the implementation of certain BMPs i� due to site factors experienced during construction. I Supporting documentation and standard forms are provided in the following Appendices: Appendix A— Site Plans I Appendix B —Construction BMPs Appendix C—Alternative BMPs Appendix D—General Permit Appendix E — Site Inspection Forms (and Site Log) Appendix F — Engineering Calculations 2 15559.004 Stormwater Pollution Preventron Plan 2.0 Site Description 2.1 Existing Conditions Under existing conditions the site is 99% impervious consisting chiefly of buildings, asphalt parking lots and concrete staging areas with 1% landscaping. The site is essentially flat with catch basin collection and pipe conveyance to direct discharge to the Cedar River across East Perimeter Road. 2.2 Proposed Construction Activities The total site is 1.856 t acres in size of which only a portion will be demolished and reconstructed. One building and a portion of another will be torn down and rebuilt larger so that the total amount of PGIS will actually be less in proposed conditions that currently exist. In addition, under proposed conditions the amount of landscaping will increase so that the overall site will be 97.5% impervious. One oil/water separator will be removed and two oil/water separators install in its stead. Construction activities will include site preparation, TESC installation, building construction, stormwater and utility appurtenance installation, and asphalt and concrete paving. The schedule and phasing of BMPs during construction is provided in Section 4.0. Stormwater runoff rates and volumes were calculated using the KCRTS hydrology model and the oil/water separators were sized by treating the 91 percentile storm events. � The following summarizes details regarding site areas: ■ Total site area: 1.856 acres ■ Percent impervious area before construction: 99% ■ Percent impervious area after construction: 97.5% • Disturbed area during construction: 0.5 acres ■ Disturbed area that is characterized as impervious (i.e., access r�ads, siaging, parking): 0.5 acre All stormwater flow calculations are provided in Appendix F. 3 15559.004 Stormwater Pollution Prevention Plan 3.0 Construction Stormwater BMPs 3.1 The 14 BMP Elements 3.1.1 Element#1 —Mark Clearing Limits To protect adjacent properties and to reduce the area of soil exposed to construction, the limits of construction will be clearly marked before land-disturbing activities begin. Areas that are to be preserved, as well as all sensitive areas and their buffers, shall be clearly delineated, both in the field and on the plans, The BMPs relevant to marking the clearing limits that will be applied for this project include: ■ High Visibility Plastic or Metal Fence (BMP C103) The clearing limits shall be as shown on the plans and all vegetation outside of the clearing limits preserved. Alternate BMPs for marking clearing limits are included in Appendix C as a quick reference tool for the onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during construction to satisfy the requirements set forth in the General NPDES Permit (Appendix D). To avoid potential erosion and sediment control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as provided in Appendix D), the Certified Erosion and Sediment Control Lead will promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix C after the first sign that existing BMPs are �, ineffective or failing. 3.1.2 Element #2 — Establish Construction Access Construction access or activities occurring on unpaved areas shall be minimized, yet where i necessary, access points shall be stabilized to minimize the tracking of sediment onto public i roads, and street sweeping and street cleaning shall be employed to prevent sediment from entering state waters. All wash wastewater shall be controlled on site. The specific BMPs . related to establishing construction access that will be used on this project include: ■ The roads shall be swept daily should sediment collect on them. Wheel washing shall occur at locations where the sediment will retain on site. Alternate construction access BMPs are included in Appendix C as a quick reference tool for the onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during construction to satisfy the requirements set forth in the General NPDES Permit (Appendix D). To avoid potential erosion and sediment control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as provided in Appendix D), the Certified Erosion and Sediment Control Lead will promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix C after the first sign that existing BMPs are ineffective or failing. 4 15559.004 Stormwater Pollution Prevention Plan 3.1 .3 Element #3 - Control Flow Rates In order to protect the properties and waterways downstream of the project site, stormwater discharges from the site will be controlled by construction of a silt fence as one of the first items of construction. Alternate flow control BMPs are included in Appendix C as a quick reference tool for the onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during construction to satisfy the requirements set forth in the General NPDES Permit (Appendix D), To avoid potential erosion and sediment control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as provided in Appendix D), the Certified Erosion and Sediment Control Lead will promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix C after the first sign that existing BMPs are ineffective or failing. The project site is located west of the Cascade Mountain Crest. As such, the project must comply with Minimum Requirement 7 (Ecology 2005). In general, discharge rates of stormwater from the site will be controlled where increases in impervious area or soil compaction during construction could lead to downstrearn erosion, or where necessary to meet local agency stormwater discharge requirements (e.g,, discharge to combined sewer systems). 3.1.4 Element #4 - Install Sediment Controls All stormwater runoff from disturbed areas shall pass through an appropriate sediment removal BMP before leaving the construction site or prior to being discharged to the downstream drainage course. The specific BMPs to be used for controlling sediment on this project include: ■ Silt Fence (BMP C233) A silt fence shall be installed along the downstream perimeter of the proposed site. Alternate sediment control BMPs are included in Appendix C as a quick reference tool for the onsite _ inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during , construction to satisfy the requirements set forth in the General NPDES Permit (Appendix D). � T�7 a�01u �:�i2i ii ai e�o�i�r a�G sz�ire��;,��r�E i�SJ2S �ilat iil&y �&uS@ a��o�a��e�(s� of iilE NPDES Construction Stormwater permit (as provided in Appendix D), the Certified Erosion and Sediment Control Lead will promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix C after the first sign that existing BMPs are ineffective or failing. In addition, sediment will be removed from paved areas in and adjacent to construction work areas manually or using mechanical sweepers, as needed, to minimize tracking of sediments on vehicle tires away from the site and to minimize washoff of sediments from adjacent streets in runoff. Whenever possible, sediment-laden water shall be discharged into onsite, relatively level, vegetated areas (BMP C240 paragraph 5, page 4-102). 5 15559.004 Stormwater Pollufron Prevention Plan In some cases, sediment discharge in concentrated runoff can be controlled using permanent stormwater BMPs (e.g:, infiltration swales, ponds, trenches). Sediment loads can limit the effectiveness of some permanent stormwater BMPs, such as those used for infiltration or biofiltration; however, those BMPs designed to remove solids by settling (wet ponds or sediment ponds) can be used during the construction phase. When permanent stormwater BMPs will be used to control sediment discharge during construction, the structure will be protected from excessive sedimentation with adequate erosion and sediment control BMPs. Any accumulated sediment shall be removed after construction is complete and the remainder of the site has been stabilized. The following BMPs will be implemented as end-of-pipe sediment controls as required to meet permitted turbidity limits in the site discharge(s). Prior to the implementation of these technologies, sediment sources and erosion control and soil stabilization BMP efforts will be maximized to reduce the need for end-of-pipe sedimentation controls, • Construction Stormwater Filtration (BMP C251) • Construction Stormwater Chemical Treatment (BMP C 250) (implemented only with prior written approval from Ecology). 3.1.5 Element #5 - Stabilize Soils Exposed and unworked soils shall be stabilized with the application of effective BMPs to prevent erosion throughout the life of the project. The specific BMPs for soil stabilization that shall be used on this project include: ■ Temporary and Permanent Seeding (BMP C120) ■ Mulching (BMP C121) ■ Dust Control (BMP C 140) Seeding shall occur on all areas to remain unworked pursuant to below, Dust shall be controlled if construction occurs during the summer. Alternate soil stabilization BMPs are included in Appendix C as a quick reference tool for the onsite inspector in the event the BMP(s) lisiea above are aeemea inerfeciive or inappropriaie ouring construction to saiisiy ihe requirements set forth in the General NPDES Permit (Appendix D). To avoid potential erosion and sediment control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as provided in Appendix D), the Certified Erosion and Sediment Control '� Lead will promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix C after the first sign that existing BMPs are ineffective or failing. The project site is located west of the Cascade Mountain Crest. As such, no soils shall remain exposed and unworked for more than 7 days during the dry season (May 1 to September 30) and 2 days during the wet season (October 1 to April 30). Regardless of the time of year, all soils shall be stabilized at the end of the shift before a holiday or weekend if needed based on weather forecasts. 6 15559At)4 Stormwafer Pollution Prevention Plan In general, cut and fili slopes will be stabilized as soon as possible and soil stockpiles will be temporarily covered with plastic sheeting. All stockpiled soils shall be stabilizeci from erosion. protected with sediment trapping measures, and where possible, be located a�n�ay from storm drain inlets, waterways, and drainage channF; 3.1.6 Element #6 — Protect Slope�� All cut and fill slopes will be designed, constructed, and protected in a manner that minimizes erosion. The following specific BMPs will be used to protect slopes for this project; ■ Temporary and Permanent Seeding (BMP C 120) Temporary and permanent seeding shall be used at all exposed areas pursuant to the prior mentioned schedule (seasonal restrictions). Alternate slope protection BMPs are included in Appendix C as a quick reference tool for the onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during construction to satisfy the requirements set forth in the General NPDES Permit (Appendix D). To avoid potential erosion and sediment control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as provided in Appendix D), tr Certified Erosion and Sediment Control Lead will promptly initiate the implementation of c more of the alternatiue BMPs listed in Ap�endix C after the first sign that existing BMPs � ineffective or failinc 3.1.7 Element „ - - - � =y�� , �.;�, ,g�tm All storm drain inlets and culverts made operable during construction shall be protected i� prevent unfiltered or untreated water from entering the drainage conveyance system. Ho the first priority is to keep all access roads clean of sediment and keep street wash water separate from entering storm drains until treatment can be provided. Storm Drain Inlet Protection (BMP C220) will be implemented for all drainage inlets and culverts that could potentially be impacted by sediment-laden runoff on and near the project site. The following inlet protection measures will be applied on this project: • Excavated Drop Inlet Protection • Block and Gravel Drop Inlet Protection • Gravel and Wire Drop Inlet Protection • Catch Basin Filters � Culvert Inlet Sediment Trap If the BMP options listed above are deemed ineffective or inappropriate during construction to satisfy the requirements set forth in the General NPDES Permit (Appendix D), or if no BMPs are listed above but deemed necessary during construction, the Certified Erosion and Sediment Control Lead shall implement one or more of the alternative BMP inlet protection options listed in Appendix C. 7 15559.004 Stormwafer PoUutron Preventron 3.1.8 Element #8 - Stabilize Channels and Outlets Where site runoff is to be conveyed in channels, or discharged to a stream or some other natural drainage point, efforts will be taken to prevent downstream erosion. The specific BMPs for channel and outlet stabilization that shall be used on this project include: Alternate channel and outlet stabilization BMPs are included in Appendix C as a quick re� tool for the onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during construction to satisfy the requirements set forth in the General NPDE� Permit (Appendix D). To avoid potential erosion and sediment control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as provided in Appendix D), the Certified Erosion and Sediment Control Lead will promptly initiate the implemen#ation pf one or more of the alternative BMPs listed in Appendix C after the first sign that existin� �MPs are ineffective or failing. The project site is located west of the Cascade Mountain Crest, As such, all temp�rary on-site conveyance channels shall be designed, constructed, and stabilized to prevent erosion from the expected peak 10 minute velocity of flow from a Type 1 A, 10-year, 24-hour recurrence interval storm for the developed condition. Alternatively, the 10-year, 1-hour peak flow rate indicated by an approved continuous runoff simulation model, increased by a factor of 1.6, shall be used. Stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent streambanks, slopes, and downstream reaches shall be provided at the outlets of all conveyance systems. 3.1.9 Element #9 - Control Pollutants All pollutants, including waste materials and demolition debris, that occur onsite shall be handled and disposed of in a manner that does not cause contamination of stormwater. Good housekeeping and preventative measures will be taken to ensure that the site will be kept clean, well organized, and free of debris. If required, BMPs to be implemented to control specific sources of pollutants are discussed below. Vehicles, construction equipment, and/or ��etrc�leurn product storage/dispensir : ■ All vehicle� ��, �.. �. _ �_._ . � ...�,. .�._�. _..� ,�... �....N.. ._.. � .. �._ will be inspected regularly to detect any leaks or spills, and to identifiy maintenance needs to prevent leaks or spills. ■ On-site fueling tanks and petr include secondary containmer ■ Spill prevention measures, suCll dS url� �dils, vviii ue us�u �vlie� conducting maintenance and repair of vehicles or equipment. ■ In order to perform emergency repairs on site, temporary plastic will be placed beneath and, if raining, over the vehicle. • Contaminated surfaces shall be cleaned immediately following any discharge or spill incident. 8 15559.004 Stormwater Pollufion Prevention Plan Demolition: ■ Dust released from demolished sidewalks, buildings, or structures will be controlled using Dust Control measures (BMP C140). ■ Storm drain inlets vulnerable to stormwater discharge carrying dust, soil, or debris will be protected using Storm Drain Inlet Protection (BfVIP C220 as described above for Element 7). ■ Process water and slurry resulting from sawcutting and surfacing operations will be prevented from entering the waters of the State by implementing Sawcutting and Surfacing Pollution Prevention measures (BMP C152). Concrete and grout: ■ Process water and slurry resulting from concrete work will be prevented from entering the waters of the State by implementing Concrete Handling measures (BMP C151). 3.1.10 Element #10 - Control Dewatering All dewatering water from open cut excavation, tunneling, foundation work, trench, or underground vaults shall be discharged into a controlled conveyance system prior to discharge to the downstream drainage course. Channels will be stabilized, per Element #8. Clean, non- turbid dewatering water will not be routed through stormwater sediment ponds, �nd will be discharged to systems tributary to the receiving waters of the State in a manner that does not cause erosion, flooding, or a violation of State water quality standards in the receiving water. Highly turbid dewatering water from soils known or suspected to be contaminated, or from use of construction equipment, will require additional monitoring and treatment as required for the specific pollutants based on the receiving waters into which the discharge is occurring. Such monitoring is the responsibiliry of the contractor. - However, the dewatering of soils known to be free of contamination will trigger BMPs to trap sediment and reduce turbidity. At a minimum, geotextile fabric socks/baqs/cells will be used to filter this material. Other BMPs to be used for sediment trapping and turbidity reduction include the following: ■ Concrete Handling (BMP C151) Concrete shall be handled pursuant to BMP C151 wherever and whenever concrete is mixed and poured at the project site. Alternate dewatering control BMPs are included in Appendix C as a quick reference tool for the onsite inspector in the event the BMP(s) listed above are deemed ineffective or inappropriate during construction to satisfy the requirements set forth in the General NPDES Permit (Appendix D). To avoid potential erosion and sediment control issues that may cause a violation(s) of the NPDES Construction Stormwater permit (as provided in Appendix D), the 9 15559.004 Stormwater Pollution Prevention Plan Certified Erosion and Sediment Control Lead will promptly initiate the implementation of one or more of the alternative BMPs listed in Appendix C after the first sign that existing BMPs are ineffective or failing. 3.1.11 Element #11 - Maintain BMPs All temporary and permanent erosion and sediment control BMPs shall be maintained and repaired as needed to assure continued performance of their intended function. Maintenance and repair shall be conducted in accordance with each particular BMP's specifications. Visual monitoring of the BMPs will be conduc#ed at least once every calendar week and within 24 hours of any rainfall event that causes a discharge from the site. If the site becomes inactive, and is temporarily stabilized, the inspection frequency will be reduced to once every month. All temporary erosion and sediment control BMPs shall be removed within 30 days after the final site stabilization is achieved or after the temporary BMPs are no longer needed. Trapped sediment shall be removed or stabilized on site. Disturbed soil resulting from removal of BMPs or vegetation shall be permanently stabilized. 3.1.12 Element #12 - Manage the Project Erosion and sediment control BMPs for this project have been designed based on the following principles: ■ Design the project to fit the existing topography, soils, and drainage patterns. ■ Emphasize erosion control rather than sediment control. ■ Minimize the extent and duration of the area exposed. ■ Keep runoff velocities low. ■ Retain sediment on site. ■ Thoroughly monitor site and maintain all ESC measures. ■ Schedule major earthwork during the dry season. In addition, project management will incorporate the key components listed below: As this project site is located west of the Cascade Mountain Crest, the project will be managed according to the following key project components: Phasing of Construction ■ The construction project is being phased to the extent practicable in order to prevent soil erosion, and, to the maximum extent possible, the transport of sediment from the site during construction. 10 ?�5�y.004 Stormwater Pollution Prevention Plan � I Revegetation of exposed areas and maintenance of that vegetation shall be an integral part of the clearing activities during each phase of I�, construction, per the Scheduling BMP (C 162). ' Seasonal Work Limitations ■ From October 1 through April 30, clearing, grading, and other soil , disturbing activities shall only be permitted if shown to the satisfaction of '� the local permitting authority that silt-laden runoff will be prevented from leaving the site through a combination of the following: ❑ Site conditions including existing vegetative coverage, slope, soil rype, '�I and proximity to receiving waters; and , ❑ Limitations on activities and the extent of disturbed areas; and ❑ Proposed erosion and sediment control measures. ■ Based on the information provided and/or local weather conditions, the , local permitting authority may expand or restrict the seasonal limitation on site disturbance. ■ The following activities are exempt from the seasonal clearing and grading limitations: ❑ Routine maintenance and necessary repair of erosion and sediment I control BMPs; '� ❑ Routine maintenance of public facilities or existing utility structures that do �I not expose the soil or result in the removal of the vegetative cover to soil; � and ❑ Activities where there is 100 percent infiltration of surface water runoff I within the site in approved and installed erosion and sediment control facilities. Coordination with Utilities and Other Jurisdictions • �G,e "as �e�^ taka^ t� c��r�i;�a�� w;." ;.atili:ies, :;.hc-r;,o„s.,;::,ti�r projects, and the local jurisdiction in preparing this SWPPP and scheduling the construction work. Inspection and Monitoring ■ All BMPs shall be inspected, maintained, and repaired as needed to � assure continued performance of their intended function. Site inspections shall be conducted by a person who is knowledgeable in the principles and practices of erosion and sediment control. This person has the necessary skills to: ❑ Assess the site conditions and construction activities that could impact the quality of stormwater, and ', 11 15559.004 III Stormwater Pollution Prevention Plan ❑ Assess the effecti�eness of erosion and sediment control measures used to control the quality of stormwater discharges. ■ A Certified Erosion and Sediment Control Lead shall be on-site or on-call at all times. ■ Whenever inspection and/or monitoring reveals that the BMPs identified in this SWPPP are inadequate, due to the actual discharge of or potential to discharge a significant amount of any pollutant, appropriate BMPs or design changes shall be implemented as soon as possible. Maintaining an Updated Construction SWPPP • This SWPPP shall be retained on-site or within reasonable access to the site. ■ The SWPPP shall be modified whenever there is a change in the design, construction, operation, or maintenance at the construction site that has, or could have, a significant effect on the discharge of pollutants to waters of the state. ■ The SWPPP shall be modified if, during inspections or investigations conducted by the owner/operator, or the applicable local or state regulatory authority, it is determined that the SWPPP is ineffective in eliminating or significantly minimizing pollutants in stormwater discharges from the site. The SWPPP shall be modified as necessary to include additional or modified BMPs designed to correct problems identified. Revisions to the SWPPP shall be completed within seven (7) days following the inspection. 3.1.13 Element #13 — Construction Stormwater Chemical Treatment Turbidity is difficult to controi once fine particles are suspended in stormwater runoff from a construction site. Sedimentation ponds are effective at removing larger particulate matter by gravity settling, but are ineffective at removing smaller particulates such as clay and fine silt. Sediment ponds are typically designed to remove sediment no smaller than medium silt (0.02 mm). Chemical treatment may be used to reduce the turbidity of stormwater runoff. Chemical treatment can reliably provide exceptional reductions of turbidity and associated pollutants. Very high turbidities can be reduced to levels comparable to what is found in streams during dry weather. Traditional BMPs used to control soil erosion and sediment loss from sites under development may not be adequate to ensure compliance with the water quality standard for turbidity in the receiving water. Chemical treatment may be required to protect streams from the impact of turbid stormwater discharges, especially when construction is to proceed through the wet season. Formal written approval from Ecology and the Local Permitting A�thority is required for the use of chemical treatment regardless of site size. The intention to use Chemical 12 1555�.004 Stormwater Pollution Prevention Plan Treatment shall be indicated on the Notice of Intent for coverage under the General Construction Permit. Chemical treatment systems shouid be designed as part of the Construction SWPPP, not after the fact. Chemical treatment may be used to correct problem sites in limited circumstances with formal written approval from Ecology and the Local Permitting Authority. The SEPA review authority must be notified at the application phase of the project review (or the time that the SEPA determination on the project is performed) that chemical treatment is proposed. If it is added after this stage, an addendum will be necessary and may result in project approval delay, See Appendix II-B for background information on chemical treatment. Criteria for Chemical Treatment Product Use Chemically treated stormwater discharged from construction sites must be nontoxic to aquatic organisms, The following protocol shall be used to evaluate chemicals proposed for stormwater treatment at construction sites. Authorization to use a chemical in the field based on this protocol does not relieve the applicant from responsibility for meeting all discharge and receiving water criteria applicable to a site. ■ Treatment chemicals must be approved by EPA for potable water use. ■ Petroleum-based polymers are prohibited. ■ Prior to authorization for field use, jar tests shall be conducted to demonstrate that turbidity reduction necessary to meet the receiving water criteria can be achieved. Test conditions, including but not limited to raw water quality and jar test procedures, should be indicative of field conditions. Although these small-scale tests cannot be expected to reproduce performance under field conditions, they are indicative of treatment capability. = rrior i� aui��riza�ior� i�r ��eld use, i�ie c�iemically i�ea�e� s�oe��ate�shal� be tested for aquatic toxicity. Applicable procedures defined in Chapter 173-205 WAC, Whole Effluent Toxicity Testing and Limits, shall be used. Testing shall use stormwater from the construction site at which the treatment chemical is proposed for use or a water solution using soil from the proposed site. ■ The proposed maximum dosage shall be at least a factor of five lower than the no observed effects concentration (NOEC). ■ The approval of a proposed treatment chemical shall be conditional, subject to full-scale bioassay monitoring of treated stormwater at the construction site where the proposed treatment chemical is to be used. 13 15559.004 � I reatment cnemicals that have already passed the above testing protocoi do not need to be reevaluated. Contact the Department of Ecology Regional Office for a list of treatment chemicals that have been �valuat; and are currently ap�. , factors that determine optimum, cost-effective performance. It may not be possible ta ' incorporate all of the classic concepts into the design because of practical limit�tinns -�: construction sites. Nonetheless, it is important to recognize the following ■ The right chemical must be used at the right dosage. A dosdge thai �- either too low or too high will not produce the lowest turbidity. Ther� - optimum dosage rate. This is a situation where the adage "addin dispersion ■ A flocculation step is important to increase the rate of settling, ta prc the lowest turbidity, and to keep the dosage rate as low as possible ■ Too little energy input into the water during the flocculation phase resu in flocs that are too small and/or insufficiently dense. Too much energy can rapidly destroy floc as it is formed. • Since the volume of the basin is a determinant in the amount of energy per unit volume, the size of the energy input system can be too small relative to the volume of the basin. ■ Care must be taken in the design of the withdrawal system to minimize outflow velocities and to prevent floc discharge. The discharge should be airecied ihrougn a physical iilter such as a vegeiated swale ihat would catch any unintended floc discharge. Treatment System Design Chemical treatment systems shall be designed as batch treatment systems using either ponds or portable trailer-mounted tanks. Flow-through continuous treatment systems are not allowed at this time. A chemical treatment system consists of the stormwater collection system (either temporary diversion or the permanent site drainage system), a storage pond, pumps, a chemical feed system, treatment cells, and interconnecting piping. 14 15559.004 Stormwater Pollutlon Prevention Plan The treatment system shall use a minimum of two lined treatment celis. Multiple treatment cells allow for clarification of treated water while other cells are being filled or emptied. Treatment cells may be ponds or tanks. Ponds with constructed earthen embankments greater than six feet high require special engineering analyses. Portable tanks may also be suitable for some sites. The following equipment should be located in an operations shed: ■ the chemical injector; ■ secondary containment for acid, caustic, buffering compound, and treatment chemical; ■ emergency shower and eyewash, and ■ monitoring equipment which consists of a pH meter and a turbidimeter. Sizing Criteria The combination of the storage pond or other holding area and treatment capacity should be large enough to treat stormwater during multiple day storm events. It is recommended that at a minimum the storage pond or other holding area should be sized to hold 1.5 times the runoff volume of the 10-year, 24-hour storm event. Bypass should be provided around the chemical treatment system to accommodate extreme storm events. Runoff volume shall be calculated using the methods presented in Volume 3, Chapter 2. If no hydrologic analysis is required for the site, the Rational Method may be used. Primary settling should be encouraged in the storage pond. A forebay with access for ', maintenance may be beneficial. There are two opposing considerations in sizing the treatment cells. A larger cell is able #o treat a larger volume of water each #ime a batch is processed. However, the larger the cell the longer the time required to empty the cell. A larger cell may also be less effective at flocculation and thereiore require a ionger seitling iime. i he simpiest approacn to sizing the ireatment cell is to _ multiply the allowable discharge flow rate times the desired drawdown time. A 4-hour drawdown time allows one batch per cell per 8-hour work period, given 1 hour of flocculation followed by two hours of settling. The permissible discharge rate governed by potential downstream effect can be used to calculate the recommended size of the treatment cells. The following discharge flow rate limits - shall apply: ■ If the discharge is directly or indirectfy to a stream, the discharge flow rate shall not exceed 50 percent of the peak flow rate of the 2-year, 24-hour event for all storm events up to the 10-year, 24-hour event. ' 1�J 15559.004 Stormwater Po!lution Prevent�on Plan ■ If discharge is occurring during a storm event equal to or greater than the 10-year, 24-hour event, the allowable discharge rate is the peak flouv rate of the 10-year, 24-hour event, ■ Discharge to a stream should not increase the stream flow r�te by rrior� than 10 percent. ■ If the discharge is directly to a lake, a major receiving water listed in Appendix C of Volume I, or to an infiltration system, there is no discharge flow limit. ■ If the discharge is to a municipal storm drainage system, the allowable discharge rate may be limited by the capacity of the public systern. It may be necessary to clean the municipal storm drainage system prior to the start of the discharge to prevent scouring solids from the drainage system, ■ Runoff rates shall be calculated using the methods presented in Volume 3, Chapter 2 for the pre-developed condition. If no hydrologic ar�alysis is required for the site, the Rationai Method may be used. Monitoring The following monitoring shall be conducted, Test results shall be recorded on � daily log kept on site: Operational Monitorinq ■ pH, conductivity (as a surrogate for alkalinity), turbidity and temp�ratur� of the untreated stormwater ■ Total volume treated and discharged ■ Discharge time and flow rate ■ Type and amount of chemical used for pH adjustment ■ Amount of polymer used for treatment ■ Settling time ��Of," i�Ij�i�iC=' n�nCf�i!vl:''.�; ---�-—..=:------__ - Jr-i ��I1C� tUik��dl�)� �_�' ti�,� 1f�Cc� (: ��I rn�: _ ■ pH and turbidity of the receiving wat� Biomonitorinq: Treated stormwater shall be tested for acute �lethal) toxicfty. E3ic�assays shall be conducted by a laboratory accredited by Ecology, unless otherwise approved by Ecology. The 16 15559.004 r �II ��•�Ul � .r, i � __ � r _ �;Cii pe��rrr�ar�ce s�ane�ard �o�acuYe ��xi�i�y is �� s�aYo��ie�hiy sig��fiear�i e�Af��-- . II�I survival between the control and 100 percent chemically treated stormwat� ', Acute toxicity tests shall be conducted with the following species and �; Ii ■ Fathead minnow, Pimephales promelas(96 hour statio- .: ,.: -,�, .. '! method: EPA/600/4-90/027F). Rainbow trout, Oncorhynchus myki� I� (96 hour static-renewal test, meth�-�' ��cnn�� nn+nn�rs .,. . �__ as a substitute for fathead minno� ' ■ Daphnid, Ceriodaphnia dubia, Daphnia ! static test, method: EPA/600/4-90/027F , All toxicity tests shall meet quality assurance criteria anca «�� ;;��U�� ;�,� ;��e,;� versions of the EPA test method and Ecology Publication #WO-R-95-80, Laboratory Guidance and Whole Effluent Toxicity Test Review Criteria. Bioassays shall be performed on the firsi five batches and on every tenth batch thereafter, or as otherwise approved by Ecology. Failure to meet the performance standard shall be immediately reported to Ecology. Discharge Compliance: Prior to discharge, each batch of treated stormwater must be sampled and tested for compliance with pH and turbidity limits. These limits may be established by the water quality standards or a site-specific discharge permit. Sampling and testing for other pollutants may also be necessary at some sites. Turbidity must be within 5 NTUs of the background turbidity. Background is measured in the receiving water, upstream from the treatment process discharge point. pH must be within the range of 6.5 to 8.5 standard units and not cause a change in the pH of the receiving water of more than 0.2 standard units. It is often possible to discharge treated stormwater that has a lower turbidity than the receiving water and that matches the pH. Treated stormwater samples and measurements shall be taken from the discharge pipe or another location representative of the nature of the treated stormwater discharge. Samples U5@Ci iOi-deiei-ffllfllfig �Ui�1�ilicl�i�� Wiiii if1@ {nlli@i C{�8iltjl Stcllli�afCaS iil ihZ �ecE�v��iy vvate��sha�� ilOt be taken from the treatment pond prior to decanting. Compliance with the water quality standards is determined in the receiving water. Operator Training Each contractor who intends to use chemical treatment shall be trained by an experienced contractor on an active site for at least 40 hours. Standard BMPs Surface stabilization BMPs should be implemented on site to prevent significant erosion. All sites shall use a truck wheel wash to prevent tracking of sediment off site. 17 15559.004 Stormwater Po!lution Prevention Plan Sediment Removal and Disposal ■ Sediment shall be removed from the storage or treatment cells as necessary. Typically, sediment removal is required at least once during a wet season and at the decommissioning of the cells. Sediment remaining in the cells between batches may enhance the settling process and reduce the required chemical dosage. ' Sediment may be incorporated into the site away from drainages, 3.1.14 Element #14 - Construction Stormwater Filtratior� Filtration removes sediment from runoff originating from disturbed areas of the site, Traditional BMPs used to control soil erosion and sediment loss from sites under development may not be adequate to ensure compliance with the water quality standard for turbidity in the receiving water. Filtration may be used in conjunction with gravity settling to remove sediment as small as fine silt (0.5 Nm). The reduction in turbidity will be dependent on the particle size distribution of the sediment in the stormwater. In some circumstances, sedimentation and filtration may achieve compliance with the water quality standard for turbidity. Unlike chemical treatment, the use of construction stormwater filtration does not require �', approval from Ecology. ' Filtration may also be used in conjunction with polymer treatment in a portable system to assure capture of the flocculated solids, Design and Installation Specifications— Background Information Filtration with sand media has been used for over a century to treat water and wastewater. The use of sand filtration for treatment of stormwater has developed recently, generally to treat runoff from streets, parking lots, and residential areas. The application of filtration to construction stormwater treatment is currently under development. Two types of filtration systems may be applied to construction stormwater treatment: rapid and slow. Rapid sand filters are the typical system used for water and wastewater treatment. They can achieve relatively high hydraulic flow rates, on the order of 2 to 20 gpm/sf, because they have automatic backwash systems to remove accumulated solids. In contrast, slow sand filters have very Iow hydraulic rates, on the order of 0.02 gpm/sf, because they do not have backwash systems. To date, slow sand filtration has generally been used to treat stormwatero Slow sand filtration is mechanically simple in comparison to rapid sand filtration but requires a much larger filter area. Filtration Equipment Sand media filters are available with automatic backwashing features that can filter to 50 µm particle size. Screen or bag filters can filter down to 5 µm. Fiber wound filters can remove 18 15559.004 Stormwater Pollution�reventfon Plan particles down to 0.5 µm. Filters should be sequenced from the largest to the smallest pore opening. Sediment removal efficiency will be related to particle size distribution in #he stormwater. Treatment Process Description Stormwater is collected at interception point(s) on the site and is diverted to a sediment poncl or tank for removal of large sediment and storage of the stormwater before it is treated by the _ filtration system. The stormwater is pumped from the trap, pond, or tank through the filtration system in a rapid sand filtration system. Slow sand filtration systems are designed as flo�nr j� through systems using gravity. If large volumes of concrete are being poured, pH adjustment may be necessary. Maintenance Standards Rapid sand filters typically have automatic backwash systems that are triggered by a pre-set pressure drop across the filter. If the backwash water volume is not large or substantially more _ turbid than the stormwater stored in the holding pond or tank, backwash return to the pond or ' tank may be appropriate. However, land application or another means of treatment and disposal may be necessary. I � ■ Screen, bag, and fiber filters must be cleaned and/or replaced when they � become clogged. ;'� ■ Sediment shall be removed from the storage and/or treatment ponds as necessary. Typically, sediment removal is required once or twice during a wet season and at the decommissioning of the ponds. 3.2 Site Specific BMPs Site specific BMPs are shown on the TESC Plan Sheets and Details in Appendix A. These site specific plan sheets will be updated annually. � � .� �- � , i 19 15559.004 Stormwater Pollution Prevention Plan 4.0 Construction Phasing and BMP Implementation The BMP implementation schedule will be driven by the construction schedule. The following provides a sequential list of the proposed construction schedule milestones and the corresponding BMP implementation schedule. The list contains key milestones such as vvet season construction. The BMP implementation schedule listed below is keyed to proposed phases of the construction project, and reflects differences in BMP installations and inspections that relate to wet season construction. The project site is located west of the Cascade Mountain Crest. As such, the dry season is considered to be from May 1 to September 30 and the wet season is considered to be from October 1 to April 30. ■ Estimate of Construction start date: May 2013 ■ Estimate of Construction finish date: October 2013 ■ Mobilize equipment on site: ■ Mobilize and store all ESC and soil stabilization products (store materials on hand BMP C150): ____.�� ■ Install ESC measures: ■ Install stabilized construction entrance: ■ Begin clearing and grubbing: ■ Temporary erosion control measures (hydroseeding): _ ■ Site inspections reduced to monthly: ■ Begin concrete pour and implement BMP C151: ■ Excavate and install new utilities and services (Phase 1): ■ Complete utility construction: • Begin implementing soil stabilization and sediment control BMPs throughout the site in preparation for wet season: • WET SEASON STARTS: October 1, 2013 20 15559.004 Stormwater Pollution Prevention Plan 5.0 Pollution Prevention Team 5.1 Roles and Responsibilities The pollution prevention team consists of personnel responsible for implementation of the SWPPP, including the following: ■ Certified Erosion and Sediment Control Lead (CESCL) —primary contractor contact, responsible for site inspections (BMPs, visual monitoring, sampling, etc.); to be called upon in case of failure of any ESC measures. ■ Resident Engineer— For projects with engineered structures only (sediment ponds/traps, sand filters, etc.): site representative for the owner that is the project's supervising engineer responsible for inspections and issuing instructions and drawings to the contractor's site supervisor or representative _ ■ Emergency Ecology Contact— individual to be contacted at Ecology in case of emergency. Go to the following website to get the name and number for the Ecology contact information: http://www.ecy.wa.gov/org.html ■ Emergency Owner Contact— individual that is the site owner or representative of the site owner to be contacted in the case of an emergency. ■ Non-Emergency Ecology Contact— individual that is the site owner or representative of the site owner than can be contacted if required. ■ Monitoring Personnel — personnel responsible for conducting water quality monitoring; for most sites this person is also the Certified Erosion and Sediment Control Lead. ; � ' � 21 15559.004 Stormwater Po!lution Prevenfion Plan 5.2 Team Members - Names and contact information for those identified as members of the pollution prevention team are provided in the following table. Title Name(s) Phone Number Certified Erosion and Sediment Control TBD Lead (CESCL) Resident Engineer Ali Sadr (425) 251-6222 Emergency Ecology Contact Clay Keown (360) 407-6048 Emergency Owner Contact TBD Non-Emergency Ecology Contact Ali Sadr (425) 251-6222 Monitoring Personnel TBD 22 15559 A04 Siorrrr��ti�ater�ollui�on Pre�i2ntior Plan � �� '`,^, `', y � - , `�_ �`,%�OililGiliil� ii;C�UCicS VISUd; IfIS�;�'-,C�I�,,, ;�(IOi�;IiC(IfIC� 101' ;Jat�.i yl!ctlli�i �.`2 c�''1�i�i5 0 ��,!'c��, r"!. ?Ai { documentation of the inspection and monitoring findings in a site loc be maintained for all on-site construction activities and will include: • A record of the imc�lementation of the S!��Pp� and .�,' requirements; ■ Site inspectior� ■ Stormwater quali� For convenience, the inspection _ _. , _ _,___ ., __, _ , �_ ._ SWPPP include the required information for the site log book. This SWPPP may func site log book if desired, or the forms may be separated and included in a separate site log book However, if separated, the site log book but must be maintained on-site or within reasonable access to the site and be made available upon request to Ecology or the local jurisdiction. 6.1 Site Inspection All BMPs will be inspected, maintained, and repaired as needed to assure continued performance of their intended function. The inspector will be a Certified Erosion and Sediment Control Lead {CESCL) per BMP C160. The name and contact information for the CESCL is provided in Section 5 of this SWPPP. Site inspection will occur in all areas disturbed by construction activities and at all stormwater discharge points. Stormwater will be examined for the presence of suspended sediment, turbidity, discoloration, and oily sheen. The site inspector will evaluate and document the effectiveness of the installed BMPs and determine if it is necessary to repair or replace any of the BMPs to improve the quality of stormwater discharges. All maintenance and repairs will be documented in the site log book or forms provided in this document. All new BMPs or design changes will be documented in the SWPPP as soon as possible. 6.1.1 Site Inspection Frequency ' Site inspections will be conducted at least once a week and within 24 hours following any rainfall event which causes a discharge of stormwater from the site. For sites with temporary stabilization measures, the site inspection frequency can be reduced to once every month. 5.1.2 Site Inspection Documentation The site inspector will record each site inspection using the site log inspection forms provided in Appendix E. The site inspection log forms may be separated from this SWPPP document, but will be maintained on-site or within reasonable access to the site and be made available upnn request to Ecology or the local jurisdiction. 23 15559.004 Stormwater Pollution Prevention Plan 6.2 Stormwater Quality Monitoring 6.2.1 Turbidity Sampling Monitoring requirements for the proposed project will include either turbidity or water transparency sampling to monitor site discharges for water quality compliance with the 2005 Construction Stormwater General Permit (Appendix D). Sampling will be conducted at all discharge points at least once per calendar week. Turbidity or transparency monitoring will follow the analytical methodologies described in Section S4 of the 2005 Construction Stormwater General Permit (Appendix D). The key benchmark values that require action are 25 NTU for turbidity (equivalent to 32 cm transparency) and 250 NTU for turbidity (equivalent to 6 cm transparency). If the 25 NTU benchmark for turbidity (equivalent to 32 cm transparency) is exceeded, the following steps will be conducted: 1. Ensure all BMPs specified in this SWPPP are installed and functioning as intended. 2. Assess whether additional BMPs should be implemented, and document revisions to the SWPPP as necessary. 3. Sample discharge location daily until the analysis results are less than 25 NTU (turbidity) or greater than 32 cm (transparency). If the turbidity is greater than 25 NTU (or transparency is less than 32 cm) but less than 250 NTU (transparency greater than 6 cm) for more than 3 days, additional treatment BMPs will be implemented within 24 hours of the third consecutive sample that exceeded the benchmark. If the 250 NTU benchmark for turbidity (or less than 6 cm transparency) is exceeded at any time, the following steps will be conducted: 1. Notify Ecology by phone within 24 hours of analysis (see Section 5.0 of , this SWPPP for contact information). �. i,oniinue daily sampiing untii ti�e iuri�idity is less ihan �5 Iv�� (or transparency is greater than 32 cm). 3. Initiate additional treatment BMPs such as off-site treatment, infiltration, filtration and chemical treatment within 24 hours of the first 250 NTU exceedance. 4. Implement additional treatment BMPs as soon as possible, but within 7 days of the first 250 NTU exceedance. 5. Describe inspection results and remedial actions taken in the site log book and in monthly discharge monitoring reports as described in Section 7.0 of this SWPPP. 24 15559.004 Stormwater Pollution Prevention Plan 6.2.2 pH Sampling Stormwater runoff will be monitored for pH starting on the first day of any activity that includes more than 40 yards of poured or recycled concrete, or after the application of "Engineered Soils" such as Portland cement treated base, cement kiln dust, or fly ash. This does not include fertilizers. For concrete work, pH monitoring will start the first day concrete is poured and continue until 3 weeks after the last pour. For engineered soils, the pH monitoring period begins when engineered soils are first exposed to precipitation and continue until the area is fully stabilized. Stormwater samples will be collected daily from all points of discharge from the site and measured for pH using a calibrated pH meter, pH test kit, or wide range pH indicator paper. If the measured pH is 8.5 or greater, the following steps will be conducted: 1. Prevent the high pH water from entering storm drains or surface water. 2. Adjust or neutralize the high pH water if necessary using appropriate technology such as CO2 sparging (liquid or dry ice). 3. Contact Ecology if chemical treatment other than CO2 sparging is planned. 25 15559.004 � � -. � �;_ � �;, 1 � � . �� — _6�� _ � � �'o`� L' ��a��m;�;p� �:�«� 7.1.1 Site Log Book ' A site log book will be maintained for all on-site construction activities and v�lill include: 'I • A record of the implementation of the SWPPP and other �erm�t requirements; I ■ Site inspections; and, ■ Stormwater quality monitoring. For convenience, the inspection form and water quality monitoring forms included in this SWPPP include the required information for the site logbook. 7.1.2 Records Retention Records of all monitoring information (site log book, inspection reports/checklists, etc.), this Stormwater Pollution Prevention Plan, and any other documentation of compliance with permit requirements will be retained during the life of the construction project and for a minimum of three years following the termination of permit coverage in accordance with permit condition S5.C. � 7.1.3 Access to Plans and Records The SWPPP, General Permit, Notice of Authorization letter, and Site Log Book will be retained � on site or within reasonable access to the site and will be made immediately available upon request to Ecology or the local jurisdiction. A copy of this SWPPP will be provided to Ecology . within 14 days of receipt of a written request for the SWPPP from Ecology. Any other information requested by Ecology will be submitted within a reasonable time. A copy of the SWPPP or access to the SWPPP will be provided to the public when requested in writing in accordance with Permit Condition S5.G. 7.1.4 Updating the SWPPP In accordance with Conditions S3, S4.B, and S9.6.3 of the General Permit, this SWPPP will be modified if the SWPPP is ineffective in eliminating or significantly minimizing pollutants in stormwater discharges from the site or there has been a change in design, construction, operation, or maintenance at the site that has a significant effect on the discharge, or potential for discharge, of pollutants to the waters of the State. The SWPPP will be modified within seven days of determination based on inspection(s) that additional or modified BMPs are necessary to correct problems identified, and an updated timeline for BMP implementation will be prepared. I 26 15559 004 Stormwater Pollution Prevention Pfan 7.2 Reporting 7.2.1 Discharge Monitoring Reports Discharge Monitoring Report (DMR) forms will be submitted to Ecology because water quality sampling is being conducted at the site. 7.2.2 Notification of Noncompliance If any of the terms and conditions of the permit are not met, and it causes a threat to human health or the environment, the following steps will be taken in accordance with permit section S5.F; 1. Ecology will be immediately notified of the failure to comply. 2. Immediate action will be taken to control the noncompliance issue and to correct the problem. If applicable, sampling and analysis of any noncompliance will be repeated immediately and the results submitted to Ecology within five (5) days of becoming aware of the violation. 3. A detailed written report describing the noncompliance will be submitted to Ecology within five (5) days, unless requested earlier by Ecology. 27 15559.004 i Stormwater Pollution Preventr'on Plan Appendix A — Site Plans I 28 17��g r�C- Stormwater Po!lution Prevention Plan Appendix B - Construction BMPs Silt Fence (BMP C233) Temporary and Permanent Seeding (BMP C120) Mulching (BMP C121) 29 15559.004 Stormwater Pollution Prevention Plan Appendix C — Alternative BMPs The following includes a list of possible alternative BMPs for each of the 12 elements not described in the main SWPPP text. This list can be referenced in the event a BMP for a specific element is not functioning as designed and an alternative BMP needs to be implemented. Element #� - Mark Clearing Limits Element #2 - Establish Construction Access Element #3 - Control Flow Rates Element #4 - Install Sediment Controls Advanced BMPs: Element #5 - Stabilize Soils Etement #6 - Protect Slopes Element #� � Stabilize Channels an�l ��tlets Element #10 - Control Dewaterii-c; Ar�riiti�nal Ariv�nrP�! RMPS tn Cnr+ ' 30 15559.004 �torm��ater Pvllutron Prev�nrron Plan . ` � 31 15559.004 crorm�.��ater Poiiur�on �'r-cveniron �'�a�� Appendix � - Site Inspection �orms (and �ite Lo��` The results of each inspection shall be summarized in an inspection report or checklist th�:i entered into or attached to the site log book. It is suggested that the inspection report or checklist be included in this appendix to keep monitoring and inspection information in on= document, but this is optional; however, it is mandatory that this SWPPP and the site insp��_;::�_ ; forms be kept onsite at all times durng construciion. ar;� that ��sr�ections be perforrned a��a docui�nented as autline� belo��J. ,�t a minimum, eaci� i��spection �-eport o� ci72cklist s��all include� a. Inspection date/times b. Weather information: general cond�tions during �nspectioi�, a�,prc>ximate arr�ount of precipitation since the last inspection, and approximate amount at prec�p�tation within the last 24 hours. c. A summary or list of all BMPs that have been implemented, includir�g observations of all erosion/sediment control structures or practicps d. The following shall be noted i. locations of BMPs inspected. ii. locations of BMPs that need n�ai,� iii. the reason maintenance is needec iv. locations of BMPs that failed to operate as designed or �ntended, anr v. locations where additional or different BMPs are needed, and TnP ro;; - why e. A description of stormwater discharged from the site. The presence c � suspended sediment, turbid water, discoloration, and/or oil sheen shall be not as applicable. f. A description of any water quality monitoring performed during inspection, anc the results of that monitoring. g. General comments and notes, including a brief description of any BMP repairs, mainienance or insiallaiions maae as a result oi the inspection. h. A statement that, in the judgment of the person conducting the site inspection, the site is either in compliance or out of compliance with the terms and conditions of the SWPPP and the NPDES permit. If the site inspection indicates that the site is out of compliance, the inspection report shall include a summary of the remedial actions required to bring the site back into compliance, as well as a schedule of implementation. i. Name, title, and signature of person conducting the site inspection; and the following statement: "I certify under penalty of law that this report is true, accurate, and complete, to the best of my knowledge and belief'. When the site inspection indicates that the site is not in compliance with any terms and conditions of the NPDES permit, the Permittee shall take immediate action(s) to: stop, contain, and clean up the unauthorized discharges, or otherwise stop the noncompliance; correct the 32 15559.004 pr�blem(s); impleme��t appropriate Best iviar�agei��ent Practices (BlviPsj, anc�ior cc��d� maintenance of existing BMPs; and achieve compliance with all applicable standards a��a p_ conditions. In addition, if the noncompliance causes a threat to human health or the environment, the Permittee shall comply with the Noncompliance Notification requirements �r Special Condition S5.F of the permit. � ; ; _. � �._ I 33 15559.004 Stormwater Pallutron Freventron Plan Site inspectior� Form General Informatian Project Name: ACE Aviation Site Modifications Inspector Name: TBD Title: CESCL # : Date: Time: Inspection Type: ❑ After a rain event ❑ Weekly ❑ Turbidity/transparency benchmark exceedance ❑ Other Weather Precipitation Since last inspection In last 24 hours Description of General Site Conditions: Inspection of BMPs Element 1: Mark Clearing Limits BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP Element 2: Establish Construction Access RMP• Location Inspected Functioning Problem/Corrective Action Y N Y N NIP � BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP �I � 34 1�s7�.oca Stormwater Pollution Preventian Plan Element 3: Control Flow Rates BMP: Location �nspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP Element 4: Insfall Sediment Controls BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: J Location Inspected Functioning Problem/Corrective Action ' Y N Y N NIP BMP: Location Inspected Functioning Problem'Corrective Actior, Y N Y N NIP BMP: Location Inspected Functionin�. Y N Y N NIJ ( ;�l 35 15559.004 Stormwater Pollution Prevent�on Plan Element 5: Sfabilize Soils BMP: Location Inspected I=unctioning Problem/Corrective Action Y N Y N NIP BMP: Location �nspected Functioning Problem/Corrective �,ction Y N Y N NIP � BMP: Location �nspected Functioning p,-oblem/Corrective Actior� Y N Y N NIP BMP: Location Inspected Functioning Y N Y N NIP Element 6: Protecf S/opes BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP 36 15559.004 Sformwater Po!lufion Preventron Plan Element 7: Protect Drain Inlets BMP: Location Inspected Functioning Problern/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP Element 8: Stabilize Channels and Outlets BMP: Location Inspected Functioning ��oble��,Ce;rr�ctive ,�ct;on Y N Y N NIP ,' BMP: Inspected Functioning Location Y N Y N NIP Probleir�;`Co�r�ecti�� ac�ior� BMP: Location �nspected Functionin Y N Y N Nlr - " " " BMP: Location �nspected Functioning Problem/Corrective Action Y N Y N NIP 37 15559.004 Stormwater Pollution Prevention Plan Element 9: Control Po/lutants BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP Element 10: Confrol Dewaterrng BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location �nspected Functioning Problem/Corrective Action Y N Y N NIP BMP: Location Inspected Functioning Problem/Corrective Action Y N Y N NIP Stormwater Discharges From the Site Observed? Problem/Corrective Action Y N Location Turbidity Discoloration Sheen Location Turbidity Discoloration Sheen 38 15559.U04 Stormwafer Po!lution Prevention Plan Water Qualit Monitorin Was any water quality monitoring conducted? ❑ Yes ❑ No If water quality monitoring was conducted, record results here: - If water quality monitoring indicated turbidity 250 NTU or greater; or transparency 6 cm or less, was Ecology notified by phone within 24 hrs? ❑ Yes ❑ No If Ecology was notified, indicate the date, time, contact name and phone number below: Date: Time: Contact Name: Phone #: General Comments and Notes Include BMP re airs, maintenance, or installations made as a result of the ins ection. Were Photos Taken? ❑ Yes o No If hotos taken, describe hotos below: 39 15559.O04 Storm��vater Pollutron F'revenhon Plan ! -- -- —-- ------ I � _ �,��.'�C�'��; i �, ��'�� ;�y1I �� '� �r,��:;��CU�:,, � __� 4� 15559.004 9.0 BOND QUANTITIES, FACILITY SUIUIMARIES, AND DECLARATION OF COVENANT 9.0 BOND QUALITIES, FACILITY SUMMARIES,AND DECLARATION OF COVENAfVT 15559.001 10.0 OPERATIONS AND MAINTENANCE MANUAL OPERATIONS AND MAINTENANCE MANUAL Site and Building Modifications for Ace Aviation 289 East Perimeter Road Renton, Washington Prepared for: ' Ace Aviation, Inc. 289 East Perimeter Road Renton, WA 98057 March 8, 2013 �u�Jo� I�o. �5559 GHA V � "I�s� CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES m "_ Z 18215 72ND AVENUE SOUTH KENT,WA 98032 � �`� - (425)251-6222 (425)251-8782 FAx �( �,,,'� ��i BRANCH OFFICES ♦ �LYMP�W b rgha Se.�C0111 TO,CA ♦ TEMECULA,C/� >, �E N�ENG�N TABLE OF CONTENTS 1.0 STATEMENTS 15559.005 1.0 STATEMENTS The Operations and Maintenance Manual shalt be kept inside the office of the Ace Aviation buiiding to be reviewed by the City of Renton at their discretion. Ace Aviation will be responsible for maintenance of the on-site storm system. This Operations and Maintenance Manual has been prepared to guide maintenance of the oil/water separator and the conveyance elements contributing to the downstream drainage course. Relief across the site is on the order of 1 foot, so it is relatively flat. The maintenance guidelines for the coalescing plate oil/water separator are included on the following pages of this report. The maintenance guidelines for the landscaping and conveyance facilities are also included. The site should be maintained on a regular basis, once in the spring and once in the fall and more frequently should it be deemed necessary, should sediment accumulate in the catch basins or pipes or oil accumulate in the oil/water separators above and beyond a 6-month cycle of maintenance. On the following pages of this report, the following are included: • Maintenance checklists from the 2009 King County Surface Water Design Manual • A recommended format for a maintenance activity log that will indicate what maintenance actions have been taken for this facility • An 11-by 17-inch map of the locations of the treatment facilities prominently noted 15559.005 V � J � H � F- C� Q W C.� Z Q Z W � H Z Q � MAINTENANCE ACTIVITY LOG DATE: Maintenance Component Defect Actions taken � 15559.005 MAINTENANCE STANDARDS FOR DRAINAGE FACILITIES ; , � � _ � � �, , �, ,_ , � � � � APPENDIX A bfAIVTE�IA�ICE REQUIRE�4ENTS FOR FLO��CO\�TROL,COI�VLYA\CE,A1�U��'Q FACILITIES NO. 5-CATCH BASINS AND MANHOLES Maintenance Defect or Problem Condition When Maintenance is Needed Results Expected When Component Maintenance is PerFormed Structure Sediment Sediment exceeds 60%of the depth from the Sump of catch basin contains no bottom of the catch basin to the invert of the sediment. lowest pipe into or out of the catch basin or is within 6 inches of the invert of the lowest pipe into or out of the catch basin. Trash and debris Trash or debris of more than Y:cubic foot which No Trash or debris blocking or is located immediately in front of the catch basin potentially blocking entrance to opening or is blodcing capacity of the catch basin qtch basin. by more than 10%. Trash or debris in the catch basin that exceeds No trash or debris in the catch basin. '!s the depth from the bottom of basin to invert the lowest pipe into or out of the basin. Dead animats or vegetation that could generate No dead animals or vegetation odors that could cause complaints or dangerous present within catch basin. gases(e.g.,methane). Deposits of garbage exceeding 1 cubic foot in No condition present which would volume. attract or support the breeding of insects or rodents. Damage to frame Comer of frame extends more than'/.inch past Frame is even with curb. and/or top slab curb face into the street(if applicable). Top slab has holes larger than 2 square inches or Top slab is free of holes and cracks. cracks wider than Y.inch. Frame not sitting flush on top slab,i.e., Frame is sitting flush on top slab. separation of more than'/.inch of the frame from the top siab. Cracks in walls or Cracks wider than Y:inch and longer than 3 feet, Catch basin is sealed and bottom any evidence of soil particles entering catch structurally sound. basin through cracks,or maintenance person judges that catch basin is unsound. Cradcs wider than Y:inch and longer than 1 foot No cracks more than'/4 inch wide at at the joint of any inlet/outlet pipe or any evidence the joint of inleUoutlet pipe. � of soil particles entering catch basin through cracks. SettlemenU Catch basin has settled more than 1 inch or has Basin replaced or repaired to design misalignment rotated more than 2 inches out of alignment. standards. Damaged pipe joints Cracks wider than Yrinch at the joint of the No cracks more than Y.-inch wide at inleUoutlet pipes or any evidence of soil entering the joint of inleUoutlet pipes. the catch basin at the joint of the inlet/outlet pipes. Contaminants and Any evidence of contaminants or pollution such Materials removed and disposed of pollution as oil,gasoline,concrete slurries or paint. according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film. InIeVOutlet Pipe Sediment Sediment filling 20%or more of the pipe. InleUoutlet pipes ciear of sediment accumulation Trash and debris Trash and debris accumulated in inleUoutlet No trash or debris in pipes. pipes(includes floatables and non-floatables). Damaged Cracks wider than%rinch at the joint of the No cracks more than Y.-inch wide at iniet/outlet pipes or any evidence of soil entering the joint of the inletloutlet pipe. at the joints of the inletlouUet pipes. 2009 Surface Water Design Manual—Appendix A 1/9/2009 A-9 APPENDIX A MAINTENANCE REQUIREMENTS FLOW CONTROL,COWEYANCE,Aiv'D WQ FACILIT[ES NO. 5�CATCH �ASINS AND MANHOLES Main4enance Defect or Problem Conditio�When Maintenance is Pleeded Resuits Expected LNlhen Component Maintenance is Performed Metal Grates Unsafe grate opening Grate with opening wider than'!e inch. Grate opening meets design (Catch Basins) standards. Trash and debris Trash and debris that is blocking more than 20% Grate free of trash and debris. of grate surtace. footnote to guidelines for disposai Damaged or missing Grate missing or broken member(s)of the grate. Grate is in place and meets design Any open structure requires u�gent standards. maintenance. Manhole Cover/Lid Covedlid not in place Coverllid is missing or only partially in place. CoverRid protects opening to Any open structure requires urgent structure. maintenance. Locking mechanism Mechanism cannot be opened by one Mechanism opens with proper tools. i Not Working maintenance person with proper tools.Bolts cannot be seated. Self-locking coverAid does not work. Covedlid difficult to One maintenance person cannot remove Coverllid can be removed and Remove covedlid after applying 80 Ibs.of lift. reinstalled by one maintenance person. 1/9/2009 2009 Surface��'ater Design Manual—Appendix A A-10 APPE�TDIX A MAI_VTEI�A�ICE REQL'IREviENTS FOR FLOW CONTROL,CO'�VEYANCE,A'VD��Q FACILITIES NO. 6-CON1/EYANCE PIPES AND DITCHES Maintenance Defect or Problem Conditions When Maintenance is Needed Results Expected When Component Maintenance is Performed Pipes Sediment&debris Accumulated sediment or debris that exceeds Water flows freely through pipes. accumulation 20%of the diameter of the pipe. � VegetatioNroots Vegetationlroots that reduce free movement of Water flows freely through pipes. ', water through pipes. Contaminants and Any evidence of contaminants or pollution such Materials removed and disposed of pollution as oil,gasoline,concrete slurries or paint. according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Damage to protective Protective coadng is damaged;rust or corrosion Pipe repaired or replaced. coating or corrosion is weakening the structural integriry of any part of pipe. Damaged Any dent that decreases the cross section area of Pipe repaired or replaced. pipe by more than 20%or is determined to have weakened stnictural integrity of the pipe. Ditches Trash and debris Trash and debris exceeds 1 cubic foot per 1,000 Trash and debris deared from square feet of ditch and slopes. ditches. Sediment Accumulated sediment that exceeds 20%of the Ditch cleanedlflushed of all sediment accumulation design depth. and debris so that it matches design. Noxious weeds Any noxious or nuisance vegetation which may Noxious and nuisance vegetation constitute a hazard to County personnel or the removed according to applicable public. regulations. No danger of noxious vegetation where County personnel or the public might normally be. Contaminants and Any evidence of contaminants or pollution such Materials removed and disposed of pollution as oil,gasoline,concrete siurries or paint. according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Vegetation Vegetation that reduces free movement of water Water flows freely through ditches. through ditches. Erosion damage to Any erosion observed on a ditch slope. Slopes are not eroding. slopes Rock lining out of One layer or less of rock exists above native soil Replace rocks to design standards. place or missing(If area 5 square feet or more,any exposed native Applicable) soil. 2009 Surface«/ater Design�lanual—Appendix A 1/9/2009 A-11 . . ;'. '. . ., �. -,.., . ,�� , '... i '� . . .. : :'l'., i .i . . .. , . .��..� . �." � . . ',. . .. � NO. 9-FENCINC Maintenance Defect or Problem Conditions When Maintenance Is Needed Results Expected When Component Maintenance is Performed Site Erosion or holes Erosion or holes more than 4 inches high and 12- No access under the fence. under fence 18 inches wide permitting access through an opening under a fence. Wood Posts,Boards Missing or damaged Missing or broken boards,post out of plumb by No gaps on fence due to missing or and Cross Members parts more than 6 inches or cross members broken broken boards,post plumb to within 1Y:inches,cross members sound. Weakened by rotting Any part showing structural deterioration due to All parts of fence are structurally ' or insects rotting or insect damage sound. Damaged or failed Concrete or metal attachments deteriorated or Post foundation capable of ' post foundation unable to support posts. supportng posts even in strong wind. Metal Posts,Rails Damaged parts Post out of plumb more than 6 inches. Post plumb to within 1%z inches. and Fabric Top rails bent more than 6 inches. Top rail free of bends greater than 1 inch. Any part of fence(including post,top rails,and Fence is aligned and meets design fabric)more than 1 foot out of design alignment. standards. Missing or loose tension wire. Tension wire in place and holding fabric. Deteriorated paint or Part or parts that have a rusting or scaling Structurally adequate posts or parts protective coating condition that has affected structural adequacy. with a uniform protective coating. Openings in fabric Openings in fabric are such that an S-inch Fabric mesh openings within 50%of diameter ball could fit through. grid size. _ i � ��i - ' I . , ' 1/9/2009 2009 Surface Water Design Manual -Appendix A ' A-14 APPENDIX A MAI�ITENArCE REQUIREMENTS FOR FLOW CONTROL,CONVEYAhCE,AND WQ FACILITIES ' NO. 10- Gi4TES1�OLLARDS/ACCESS �ARRIERS Maintenance Defect or Problem Conditions When Maintenance is Needed Results Eupected When Component Maintenance is Performed Chain link Fencing Damaged or missing Missing gate. Gates in place. Gate members Broken or missing hinges such that gate cannot Hinges intact and lubed.Gate is be easily opened and closed by a maintenance working freely. person. Gate is out of plumb more than 6 inches and Gate is aiigned and vertical. more than 1 foot out of design alignment. Missing stretcher bar,stretcher bands,and ties. Stretcher bar,bands,and ties in place. Locking mechanism Locking device missing,no-functioning or does Locking mechanism prevents does not lock gate not link to all parts. opening of gate. Openings in fabric Openings in fabric are such that an&inch Fabric mesh openings within 50%of diameter ball could fit through. grid size. Bar Gate Damaged or missing Cross bar does not swing open or closed,is Cross bar swings fully open and cross bar missing or is bent to where it does not prevent closed and prevents vehicle access. vehicle access. Locking mechanism Locking device missing,no-functioning or does Locking mechanism prevents does not lock gate not link to ail parts. opening of gate. Support post Support post does not hold cross bar up. Cross bar held up preventing vehicle damaged access into facility. Boliards Damaged or missing Bollard broken,missing,does not fit into support No access for motorized vehicles to ' hole or hinge broken or missing. get into facility. Does not lock Locking assembly or lock missing or cannot be No axess for motorized vehicles to attached to lock bollard in place. get into facility. Boulders Dislodged Boulders not located to prevent motorized vehide No access for motorized vehicles to access. get into facility. Circumvented Motorized vehicles going around or between No access for motorized vehicles to boulders. get into facility. 2009 Surface Water Design Manual—Appendix A 1/9,�2009 A-15 APPENDIX A MAItiTENANCE REQtiIREME�ITS FLOW CONTROL,CONVEYANCE,A�TD WQ FACILITIES NO. 11 -GROUNDS (LAN�SCAPING) Maintenance Defect or Problem Conditions When Maintenance is Needed Results Expected When � Component RAaintenance is Performed Site Trash or litter Any trash and debris which exceed 1 cubic foot Trash and debris cleared from site. ' per 1,000 square feet(this is about equal to the amount of trash it would take to fill up one standard size office garbage can). In general, there should be no visual evidence of dumping. Noxious weeds Any noxious or nuisance vegetation which may Noxious and nuisance vegetation constitute a hazard to County personnel or the removed according to applicable public. regulations. No danger of noxious vegetation where County personnel or the public might normally be. Contaminants and Any evidence of contaminants or pollution such Materials rernoved and disposed of pollution as oil,gasoline,concrete slurries or paint. according to applicable regula6ons. Source control BMPs implemented if appropriate. No contaminants present other than a surtace oil film. Grass/groundcover Grass or groundcover exceeds 18 inches in Grass or groundcover mowed to a height. height no greater than 6 inches. Trees and Shrubs Hazard Any tree or limb of a tree identified as having a No hazard trees in fadlity. potential to fall and cause property damage or ' threaten human life. A hazard tree identified by a qualified arborist must be removed as soon as possible. Damaged Limbs or parts of trees or shrubs that are split or Trees and shrubs with less than 5°/a , broken which affect more than 25%of the total of total foliage with split or broken foliage of the tree or shrub. limbs. Trees or shrubs that have been blown down or No blown down vegetation or knocked over. knocked over vegetation. Trees or shrubs free of injury. Trees or shrubs which are not adequately Tree or shrub in place and supported or are leaning over,causing exposure adequately supported;dead or of the roots. diseased trees removed. 1/9/2009 2009 Surface Water Design�fanual—Appendix A A-l6 APPENDIX A MAINTENAIvCE REQUIRE:VIENTS FOR FLOW CON I'ROL,CONVEYANCE,AND WQ FACILITIES PI�. 23-�0�4LESCING PLATE OILIVII�►T�F�SEP�►FtATOR Maintenance Defect Condition When Maintenance is Needed Results Expected When Component Maintenance is Pertormed Site Trash and debris Any trash or debris which impairs the function of Trash and debris removed from the facility. facility. Contaminants and Floating oil in excess of 1 inch in first chamber, No contaminants present other than pollution any oil in other chambers or other contaminants a surface oil film. of any type in any chamber. Vault Treatment Sediment Sediment accumulation of 6 inches or greater in No sediment in the forebay. Area accumulation in the the forebay. forebay Discharge water not Inspection of discharge water shows obvious Repair function of plates so effluent clear signs of poor water quality-effluent discharge is clear. from vault shows thick visible sheen. Trash or debris Trash and debris accumulation in vault Trash and debris removed from accumulation (floatables and non-floatables). vault. ' , Oil accumulation Oil accumulation that exceeds 1 inch at the water No visible oil depth on water and surface in the in the coalescing plate chamber. coalesang plates clear of oii. Coalescing Plates Damaged Plate media broken,deformed,cracked andlor Replace that portion of inedia pack showing signs of failure. or entire plate pack depending on severity of failure. Sediment Any sediment accumulation which interferes with No sediment accumulation accumulation the operation of the coalescing plates. interfering with tne coalescing plates. Vault Structure Damage to Wall, Cracks wider than Yrinch and any evidence of Vault replaced or repaired to design Frame,Bottom,and/or soil particles entering the structure through the specifications. Top Slab cracks,or maintenance inspection personnel determines that the vault is not structurally sound. Baffles damaged Baffles corroding,cracking,warping and/or Repair or replace baffles to showing signs of failure as determined by specifications. maintenancefinspection person. Ventilation Pipes Plugged Any obstruction to the ventilation pipes. Ventilation pipes are clear. Shutoff Valve Damaged or Shutoff valve cannot be opened or closed. Shutoff valve operates normally. inoperable Inlet/Outlet Pipe Sediment Sediment filling 20%or more of the pipe. InleUouUet pipes clear of sediment. accumulation Trash and debris Trash and debris accumulated in inlet/ouUet No trash or debris in pipes. pipes(includes floatables and non-floatables). Damaged Cracks wider than%z-inch at the joint of the No cracks more than Y.-inch wide at inleUoutlet pipes or any evidence of soil entering the joint of the inleUoutlet pipe. at the joints of the inletloutlet pipes. Access Manhole Covedlid not in place CoverAid is missing or only partially in place. Manhole access covered. My open manhole requires immediate maintenance. Locking mechanism Mechanism cannot be opened by one Mechanism opens with proper tools. not working maintenance person with proper tools.Bolts cannot be seated. 5elf-locking covedlid does not work. CoveNlid difficult to One maintenance person qnnot remove CoverAid can be removed and remove coverAid after applying 80 Ibs of lift. reinstalled by one maintenance person. Ladder rungs unsafe Missing rungs,misalignment,rust,or cracks. Ladder meets design standards. Allows maintenance person safe access. 2009 Surface Water Design Manual—Appendix A l/9/2009 A-3 3 APPENDIX A MAINTENANCE REQUIREMENTS FLOW CONTROL,CONVEYANCE,AND WQ FACILITIES fVO. 23-COAI�ESCINC; PLATE OIUWATER�EP�►RAl'OfZ Maintenance Defect Condition When Maintenance is Needed Results Expected When Component Maintenance is Performed Large access Damaged or difficult Large access doors or plates cannot be Replace or repair access door so it doors/plate to open opened/removed using normal equipment. can opened as designed. , Gaps,doesn't cover large access doors not flat and/or access Doors close flat and cover access � completely opening not completely covered. opening completely. Lifting Rings missing, Lifting rings not capable of lifting weight of door Lifting rings sufficient to lift or , rusted or plate. remove door or plate. , 1/9/2009 2009 Surface Water Design Manual—Appendix A A-34 Z Q J 0. 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