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HomeMy WebLinkAboutCAG1997-0133 - Supplement - King County Dept of Natural Resources - Provision of Surface Water Services - 06/06/2013 Records Ma"na"Ogem16WAD ; ocument 9HiNGTON CONTRACT COVER SHEET This is to be completed by the Contract Manager prior to submission to City Clerks Office. All portions are to be completed. If you have questions, please contact City Clerk's Office. Vendor Name: King County Vendor Number: JD Edwards Number Contract Number: P(A)OR - G5( This is assigned by City Clerk's Office Project Name: Additional Services Interlocal Agreement btwn King County & City of Kent for the Provision of Surface Water Services. Description: ® Interlocal Agreement ❑ Change Order ❑ Amendment ❑ Contract ❑ Other: Contract Effective Date: June 2013 Termination Date: Sep. 30, 2013 Contract Renewal Notice (Days): N/A Number of days required notice for termination or renewal or amendment Contract Manager: Todd Hunsdorfer Department: Public Works Environmental Detail: (i.e. address, location, parcel number, tax id, etc.): Amendment to Interlocal Agreement w/King County for Stormwater Pond and Bioswale maintenance. To end no later than September 30, 2013. S:Pub]is\Records Ma nagement\Forms\ContractCover\adcc7832 1 11/08 Additional Services Interlocal Agreement Between King County and City of Kent For The Provision of Surface Water Services Scope of Work 2013 Citywide Bioswale and Stormwater Pond Maintenance King County will provide services to the City of Kent under this Scope of Work pursuant to the Interlocal Agreement between King County and the City of Kent for the Provision of Surface Water Services, executed March 26, 1997. PROJECT DESCRIPTION The project consists of removing approximately 1631 tons of soil sediments and 589 cubic yards of vegetation from 21 City owned bioswales and 4 City owned stormwater ponds. This work will help restore the overall ability to treat and control the flow of stormwater runoff that has diminished over the years with sediment and vegetation build- up This work will also include miscellaneous items and other related work associated with the maintenance of the bioswales and stormwater ponds. The purpose of this project is to perform work identified as a maintenance component within the City's National Pollutant Discharge Elimination System Phase II Permit. The NPDES Phase II Permit requirements state that after a deficiency is found within city owned bioswales and stormwater ponds, the City has 24 months from the date of inspection to make the necessary repairs TASKS City of Kent will provide the maps and plans necessary for the successful completion of the bioswale and stormwater pond maintenance. A.Temporary Erosion and Sediment Control 1. The following tools and materials will be available on site and deployed as needed during construction: • Straw bales for slope mulching • Silt fencing for perimeter siltation control • Hand brooms, street sweepers, and wash trucks for control of sediments on paved traffic surfaces • A spill response kit All paved traffic areas will be kept free from sediment accumulations by daily sweeping or washing. B. Traffic Control 1. Maintain all traffic with traffic control flaggers throughout construction activities. C. Miscellaneous Maintenance Additional Work: Interlocal Agreement 1 King County and City of Kent Surface Water Services 1. Perform mowing and selected removal of trees and tree stumps that exceed 18 inch diameter. Place riprap around conveyance lines that inlet into the pond as stated within the specifications provided Place crushed rock surfacing as directed by City staff. 2. Remove and restore fencing as shown on site drawings,the specifications and or by the City representative. D. Removal and Disposal of Material 1. Remove and properly dispose of solids and sediments from the 21 listed bioswales and 4 stormwater ponds. 1631 tons of soil sediments and 589 cubic yards of vegetation are to be removed 2. Hydroseed the exposed soil areas that have been impacted by the maintenance activity as directed by the City representative. SCHEDULE Work is anticipated to be completed within 60 working days after a notice to proceed is issued, and no later than September 30, 2013 unless otherwise allowed in writing by the City representative. Hours of construction are between 7:00 am and 10 pm. ESTIMATED COST As provided in Exhibit B, the County has provided an estimate of$458,748.62 to perform the work. The County will provide the City all invoices and costs incurred for construction costs If any change order is needed, the County will immediately inform the City in writing of the proposed changes and the change order work shall not proceed until the City has approved. The amount of any change orders shall not cause the total costs for the project work to exceed the above estimate. Authorized by City of Kent: Nam Cooke itl or G, / e: Additional Work. Interlocal Agreement 2 King County and City of Kent Surface Water Services Form A Page i of 1 Form A Detailed Information Request #: KT-030 Date Submitted: 03/21/2013 Problem Description: The 2013 City of Kent Bioswale and Stormwater Pond Maintenance is a project that consists removing soil and vegetation in 21 City owned bioswales and 4 City owned stormwater ponds. Nature of Request: The 2013 City of Kent Bioswale and Stormwater Pond Maintenance project includes removing approximately 1875 tons of soil sediments and 639 cubic yards of vegetation in 21 city owned bioswales and 4 city owned stormwater ponds . Location: 4 City owned stormwater ponds and 21 bioswales have been identified. Reference the attached specifications and plans for location Attachments: Scope of Work: Yes Engineering Design: No Map: No Budget: No City Priority: High Special Scheduling Requirements: Please discuss scheduling of work with city project manager for more details City Project Manager: Todd Hunsdorfer - 253-856-5537 Authorized By: Beth Tan r (u m m a a� (M r 00 CD to O C M N CD r M (D N V' I,- V M M M 'd' 1, M M O O N ( Iq NN M D M y o � m U C > Y O E o IL NE 0 ++ W i >, = O O O o O o O O O o O tO o O O O O d o o o o 0) d t N r N N CO tO r r r N N 00 CD 00 _0 01 c r tD N M m l D_ NR E O O O O O O O O O O O O O O O O O O O O N O N y O O O O O O O O O O O 0 CD CD 0 0 0 O 0 0 (D O (fl O O V (D N M r O O M , tO O (D r O 0 V' M M t` (� W 00 V O r M M M O r r O O r M M Mr� O CD N tO (D O O V N Mn O r M 00 O r (` V (D (D � N Mr� V (D r M O r t` N N t` M Cl) (0 (A M O CO M r (D N N (D V N N O (D (T O 00 +d+ �+ �-- C4 c-- r 69 69 r r N r N 1 1 r N N r r N d' () W tD (6 = 64 EH (f) (R 69 (A 64 64 Efl 69 69 64 64 64 69 (A (fl (fl UY V' E E 613, y 7 W 0) 0 ) N O tlJ d Q Q r Q r r d r r N Q y C QO Q O CO O O 0 0 0 O O O r N O N M CD 0 co � M O (rQ a QQmm U Iio LLi (LLL Ye EL � K7D >- � LU LU LU F a> 3 o e m 0 2 m m u u via cn (n (n (n � cnm � cncn (n � (n (n (nm (nm (naa n mm mmmmmmmmmmmmmmmmmmmmmm 3 a` R - f' a Y M yO N ry m t yaa� �p-L N 03 R U R P. y U ry O W j 6 O 3 C (n to a c m <n 35 Bel `v 1 �__ 34W4YL IR•� 4, 3�rN � y�x� R t F sew ".ur35^V HbI L ' y �R ssw*• Y�'Z1 V /e 'fs •`3L ss.veYL --,�v.,.��{/'�J I✓�y,a �_•�,,'�Tf—/ I ^i c_ 4cI �w t^ �° WP.4 "'�.\ Fr—^L IA 3s•M 1�` C �tl ...._Fi=�:'pi�' x .�-.S ntlYVI _ ;, � � % ���a'�_�_a 0Q ,� � �l �.�.'� °-`��.'.•, W a�a _ a•rtF � c AS / � a r• ti�i 4•F fM1 � 34W4Y1 O� / a� �ry dye". 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'iF.v i« $ 33uni •@ wl 1 _ � N'vt.u s ra —i�I ea ° - e�_ aum, xu Tit bi Im IS ,ia e� ay 3GHc01 , o^p ,} x 1 esle MI i~ a It 311-1.11 »1 G ° ° 1 b /'J ~6+r W -`{te [•u'°Slue� tl sMeG tlw. i i s 4 sau s dl \\ ,er cols • x a � �%•i r �_ �7-¢.. I 1 ++ _l 4 ._._.r¢^ ie w xC/ ii l � ?s it_ � ^� i xx • d m � 1._rs "fz Middle Foa w i! @ F"' _ ° wemnx Page 1 of 2 City of Kent — 2013 Bioswale and Stormwater Pond Maintenance Project — Stormwater BMPs For work on City of Kent Bioswales and Ponds please refer to this list of Best Management Practices for stormwater pond maintenance. Protect Sensitive Areas All vegetation cleared as a part of the project will occur within the immediate area of the pond. Work is not allowed outside the delineated areas shown on the pond maps. If there are any concerns about sensitive area boundaries, contact the city inspector immediately. Minimize/Mitigate Trackout Construction access or activities occurring on unpaved areas shall be minimized, yet where necessary, access points shall be stabilized to minimize the tracking of sediment onto roads. Street sweeping shall be conducted daily,as necessary Control Dewatering Dewatering water from ponds cannot be discharged into surface waters,sensitive areas,or the stormwater system. If dewatering is necessary, the following are viable options for disposing of the water: • Infiltration into non-sensitive areas within the pond property. This should be accomplished by pumping through a flow spreader. Visual monitoring will be required to ensuic that no erosion,sedimentation,or othei downstream impacts occur. • Discharge to the sanitary sewer system with approval from the city inspector and King County Industrial Waste. • Pump into tanker truck and haul to an approved disposal facility with proper receipts for disposal • Water can be pumped to other pond cells or left in the pond only if the pond wiIl not discharge within 24 hours of in-water work or pumping. Stabilize Soils Exposed soils shall be stabilized immediately after completion of work on ponds or as directed by the city inspector. BMPs for soil stabilization that shall be used on this project include: • Straw mulch and hand seeding as per the Kent Surface Water Design Manual: Prior to Sept 15 or as directed by the city inspector. • Hydroseeding with tackifier as per the Kent Surface Water Design Manual- After Sept 15 or as directed by the city inspector. • Erosion control blankets as necessary on steep slopes. Page 2 of 2 Protect Drain Inlets All catch basins that have the potential to be impacted by pond maintenance activity will be protected by storm drain Inlet Protection. Any entrances to the ponds that have a potential to experience track-out will be swept and the sediments will be removed from the roadway appropriately to further prevent any sediment or debris from entering into the conveyance system Control Pollutants Re-fueling of vehicles or equipment shall not occur within the pond or anywhere that spilled material can entei the pond, stormwater system,sensitive areas, or surface waters. Spill response materials shall be kept on-hand when equipment is being operated on pond sites 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. 1 WSDOT SPECIFICATION EXCERPTS WSDOT 8-01 3(2)1 MOWING EACH MOWING WILL BE CONSIDERED ONE COVERAGE OF ALL AREAS TO BE MOWED WITHIN A DEFINED AREA HE HEIGHT OF MOWING WILL BE 4 TO 6 INCHES OR AS DESIGNATED IN THE SITE DRAWINGS/PLANS OR IN THE SPECIAL PROVISIONS WSDOT 8-01 3(3) PLACING EROSION BLANKETS THE SLOPE RATING OF THE BLANKET, AS SPECIFIED BY THE MANUFACTURER, SHALL BE APPROPRIATE FOR THE INTENDED SLOPE AND INSTALLED ACCORDING TO THE STANDARD PLANS. TEMPORARY EROSION CONTROL BLANKETS AS DEFINED IN WSDOT 9-14.5, HAVING AN OPEN AREA OF 60—PERCENT OR GREATER, MAY BE INSTALLED PRIOR TO SEEDING BLANKETS WITH LESS THAN 60—PERCENT OPEN SPACE SHALL BE INSTALLED IMMEDIATELY FOLLOWING THE SEEDING AND FERTILIZING OPERATION. WSDOT 8-01 3(8) STREET CLEANING STREET SWEEPING SHALL BE USED WHENEVER REQUIRED BY THE ENGINEER WHEN SEDIMENT/DEBRIS CONDITIONS EXIST. WSDOT 8-01 3(9) SILT FENCE SILT FENCE SHALL BE INSTALLED ACCORDING TO THE SITE DRAWINGS AND/OR AS REQUIRED BY THE ENGINEER INSTALLATION SHOULD BE ACCORDING TO MANUFACTURER'S RECOMMENDATIONS AND FOLLOW WSDOT 8-01.3(9) SILT FENCE, GUIDELINES. CONSTRUCTION NOTES 1. REMOVE SEDIMENT AND VEGETATION AT BOTTOM OF PONDS TO A DEPTH OF 6", UNLESS DIRECTED OTHERWISE BY ENGINEER. 2. PRESERVE VEGETATION AT TOP OF SLOPES. 3. REMOVE ALL TREES, INCLUDING WILLOWS, UNLESS SHOWN ON PLANS TREES SHOWN ON PLANS ARE TO REMAIN. THE CONTRACTOR SHALL BE RESPONSIBLE FOR REVIEWING EACH SITE TO DETERMINE THE EXTENT OF TREE AND BRUSH REMOVAL 4. DISTRIBUTE RIPRAP EVENLY THROUGH REQUIRED AREAS. REMOVE ALL TREES, WILLOWS, AND ;�✓,/�; STUMPS FROM POND PRESERVE ' Y E BOTTOM UNLESS VEGETATION AT (, �af'r NOTED OTHERWISE TOP OF SLOPES J" �y 1' M .II kX 444 44 Ml 1,ill XY 1 41 APPROXIMATE 3.1 SLOPE 6" SEDIMENT AND VEGETATION REMOVAL ALONG POND BOTTOM TYPICAL POND SECTION GRATE PLACE SILT SACK OR 1" REBAR FOR APPROVED EQUAL BAG REMOVAL UNDER INLET GRATE PRESERVE VEGETATION AT 3ys .I TOP OF SLOPES , EXISTING y INLET , 3" SEDIMENT AND VEGETATION a REMOVAL ALONG BIOSWALE BOTTOM. ` z� a� � HYDROSEED AFTER REMOVAL. INLET PROTECTION TYPICAL BIOSWALE SECTION GENERAL REMOVAL OF 2013 CITYWIDE BIOSWALE Nr NOTES, SEDIMENT, DEBRIS [cE LEGEM.AND AND STORMWATER POND "NT AND INVASIVE SPECIES CRY °` KENr MAINTENANCE ENGINEERING DEPARTMENT POND gECT1ON I IKENT.W OWE IN AND AROUND POND A 3 WA. 9802 GENERAL NOTES 1. PRIOR TO ANY CONSTRUCTION ACTIVITY THE CONTRACTOR SHALL ATTEND A PRE- CONSTRUCTION CONFERENCE WITH CITY OF KENT INSPECTION PERSONNEL. 2. CONTRACTOR SHALL PROVIDE NOTIFICATION OF WORK AND STREET/ALLEY CLOSURE TO ALL RESIDENCES A MINIMUM OF TWO (2) DAYS PRIOR TO MOBILIZING EQUIPMENT THIS IS TO BE ACCOMPLISHED WITH DOOR HANGER BROCHURES PROVIDED BY THE CONTRACTOR 3. THE CONTRACTOR IS SOLELY RESPONSIBLE FOR THE MEANS, METHODS AND SEQUENCES OF CONSTRUCTION, AND FOR THE SAFETY OF THE WORKERS. 4. UNLESS OTHERWISE NOTED, THE WORD "REMOVE" OR "REMOVAL" IN THE CONSTRUCTION NOTES, SPECIFICATIONS OR PLANS MEANS REMOVAL, HAUL AND PROPER OFF-SITE DISPOSAL BY THE CONTRACTOR AT AN APPROVED SITE AT THE CONTRACTORS EXPENSE 5. BIOSWALE/POND ELEVATION, SHAPE AND SCALE MAY BE DIFFERENT THAN SHOWN ON SITE DRAWINGS. PRIOR TO WORK, CONTRACTOR SHALL VERIFY EXISTING SHAPE OF BIOSWALE/POND HOLDING AREA AND LOCATIONS OF IN/OUTLET PIPES BEFORE SEDIMENT/VEGETATION REMOVAL ANY CONFLICTS SHALL BE RESOLVED WITH THE ENGINEER. 6. CLEARING WILL CONSIST OF MOWING AND BRUSH CLEARING FROM THE STORMWATER BIOSWALE/POND HOLDING AREA SIDE SLOPES TO THE STORMWATER BIOSWALE/POND AREA LIMIT THE SITE DRAWINGS ILLUSTRATE APPROXIMATE LOCATIONS OF HOLDING AREA AND BOUNDARIES THE HEIGHT OF MOWING WILL BE BETWEEN 4 TO 6 INCHES, OR AS DESIGNATED BY THE ENGINEER. TREES DESIGNATED TO REMAIN ARE ILLUSTRATED ON THE SITE DRAWINGS. REMOVE ALL BLACKBERRY BUSHES FROM BIOSWALE/POND SITES 7. UNDERGROUND FACILITIES OR UTILITIES MAY NOT BE SHOWN ON THESE DRAWINGS. IDENTIFICATION, LOCATION, MARKING AND RESPONSIBILITY FOR UNDERGROUND FACILITIES OR UTILITIES IS GOVERNED BY THE PROVISIONS OF CHAPTER 19.122, REVISED CODE OF WASHINGTON. IT IS THE SOLE RESPONSIBILITY OF THE CONTRACTOR TO INDEPENDENTLY VERIFY ALL UTILITY LOCATIONS AND TO FURTHER DISCOVER AND AVOID ANY OTHER UTILITIES NOT SHOWN HEREON WHICH MAY BE AFFECTED BY THE IMPLEMENTATION OF THIS PLAN. THE CONTRACTOR SHALL CONTACT THE UNDERGROUND UTILITIES LOCATION SERVICE (8-1-1) AT LEAST 2 WORKING DAYS PRIOR TO CONSTRUCTION. THE OWNER OR HIS REPRESENTATIVE AND THE ENGINEER SHALL BE CONTACTED IMMEDIATELY IF A CONFLICT EXISTS. 8. THE APPROVED TRAFFIC CONTROL PLANS, THE APPROVED TEMPORARY EROSION/SEDIMENTATION CONTROL PLANS, THE STANDARD SPECIFICATIONS AND KENT SPECIAL PROVISIONS SHALL BE ON THE JOB SITE WHENEVER CONSTRUCTION IS IN PROGRESS 9. CONTRACTOR SHALL RESTORE ALL LANDSCAPED AREAS ON-SITE AND ADJACENT TO THE SITE THAT WERE DISTURBED BY CONSTRUCTION TO ORIGINAL CONDITION. 10. THE CONTRACTOR SHALL KEEP STREETS CLEAN AT ALL TIMES BY STREET SWEEPING WHEN NECESSARY, OR WHEN DIRECTED BY THE CONSTRUCTION ENGINEER 11. THE CONTRACTOR SHALL COMPLY WITH ALL PUBLIC CONVENIENCE AND SAFETY MEASURES AS DESCRIBED IN SECTION 1-07 23 TO SECTION 1-07.23(2) OF THE KENT SPECIAL PROVISIONS FOR CONSTRUCTION UNDER TRAFFIC AND DETOURS. 12. ALL EXISTING UTILITIES SHALL REMAIN IN SERVICE UNLESS OTHERWISE NOTED 13. CAUTION - EXTREME HAZARD - OVERHEAD AND UNDERGROUND ELECTRICAL SERVICE LINES ARE GENERALLY NOT SHOWN ON THE DRAWINGS THE CONTRACTOR IS RESPONSIBLE FOR DETERMINING THE EXTENT OF ANY HAZARD CREATED BY OVERHEAD OR UNDERGROUND ELECTRICAL POWER IN ALL AREAS AND SHALL FOLLOW PROCEDURES DURING CONSTRUCTION AS REQUIRED BY LAW AND REGULATION PRIOR TO CONSTRUCTION THE CONTRACTOR SHALL MEET WITH UTILITY OWNERS AND DETERMINE THE EXTENT OF HAZARD AND REMEDIAL MEASURES AND SHALL TAKE WHATEVER PRECAUTIONS THAT MAY BE REQUIRED. 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M� mmw I.Sjm d OFO +, O¢m F(A Q Z U O Z p Y H F W Z Mao3ax sF > w $ z¢ zo¢¢z wa n MaF= — 3 1 S�cWiOZM UXU�y Q W J W> O O S J G J 2 S O WJZdp2'D_'K WJ2JK¢i,c., �fr o¢om¢aae O<oap Joo Qo_ I n n a O t°n m. 3AO9V 33S — 3N,1HO1tlW na az eWVX/+ �VAKw OW M�AS01e eta 9ZW-a\lYDC]MUL,T o Y \�� \ ()j�/ \� �) - `���� �\ }N\( %/®: 2 � i° xi�7® {: ' m Ct : G) § \§f , / ® �� §\ ` 22 § a \§8 DOWNSTREAM E2 ! )° \{ )2 © TA e ! § _ m \ ) 2 2q ) - 0 0 ` ` � �> J� \ : / ©/§ Ct ( ^ ,> )° * w_�� ~\ rr & ; __ ° \ ` ! 6 DRIVEWAY \ �%__, !!§ { � Flo —®-- ' ) \ ° @ , ° MAINTAIN 11' MIN \ m - TRAVEL mm J ~ [ e ( 0 / T � \ ( \ }{ j \ \ { � -( / § ! )r , § 0 2 ` . 2/ = o , - \ (j 0 } ` ^ \ ) )§ ~ /\ /x �° )% ° » . ® )d !; 3 /3 �! 1 , § z� { z . � z \ MATCHLINE - SEE BELOW KEI�[ Agenda Item: Consent Calendar - 7D TO: City Council DATE: May 7, 2013 SUB3ECT: King County Interlocal Maintenance Agreement for City Stormwater Ponds & Bioswales - Authorize MOTION: Authorize the Mayor to sign an amendment to the City's Interlocal Agreement with King County to perform maintenance on the City's Stormwater Ponds and Bioswales, subject to final terms and conditions acceptable to the City Attorney and Public Works Director SUMMARY: As a condition of the city's National Pollutant Discharge Elimination System Phase II Permit (NPDES Permit) and the federal Clean Water Act, the City is required to maintain stormwater ponds and bioswales. The City has an existing Interlocal Agreement with King County that allows the County to perform work at the City's request, based on County availability. The agreement was executed in 1997 to take advantage of King County's maintenance and operations resources for this "specialty work." The City is proposing to partner with King County to complete the maintenance of 21 bioswales and 4 stormwater ponds citywide. King County crews have experience with this type of maintenance work and can do the work efficiently and cost effectively. Amending the Interlocal Agreement with King County to include the proposed maintenance allows the City to meet NPDES Permit requirements while reducing the city's overall costs. The cost to use King County crews for this work is limited not to exceed $460,000. EXHIBITS: King County Interlocal Agreement RECOMMENDED BY: Public Works Committee BUDGET IMPACTS: Funds for this project have been budgeted through the City's Storm Drainage Utility �S REQUEST FOR MAYOR'S SIGNATURE Please Fill in All Applicable Bo xes oxes C. KENT �vlewed by Director Originator's Name:C�IEV-Lj Dept/Div. P v' At to 1, Extension: 5; Date Sent: Date Required: , Return to: , ��' �{�� r� x t'ti .I CONTRACT TER INATION DATE: �,� 3(� ,) VENDOR: DATE OF COUNCIL APPROVAL: ATTACH THE COUNCIL MOTION SHEET FOR THE MAYOR - if a licab e Brief Explanation of pocument: 1 Z' All Contracts Must Be Routed Through The Law Department (This area p# ,ha aw Department) Received: i�d134•�• Approval of Law Dept.: JUN 0 5 2013 �� Law Dept. Comments: KENT LAVV DEP 1 D 11'hi fir 2012 Date Forwarded to Mayor: (� i ( 1 ��� City of Kent Shaded Areas To Be Completed By Administration Staff Received: JUN - 6 2013 Recommendations and Comments: CITY OF KENT �II CITY CLERK Disposition: Date Returned: