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Home My WebLink AboutRC 20230426000416 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-1 of 23 Record Date:4/26/2023 12:15 PM Electronically Recorded King County,WA Return Address: City Clerk's Office City of Renton 1055 S Grady Way Renton,WA 98057 rie�se pt��c ot��ype��rot��c�o��WASHINGTON STATE RECORDER'S Cover Sheet (xcw 6s.oa> �OCUrilerit Tltle(S� (or transactions contained therein): (all areas applicable to your document must be filled in) 1, Declaration of Covenant-Valley Medical Center 2, MOR 3. 4. Reference Number(s) of Documents assigned or released: Additional roference#'s on pagc of documcnt Grantor(s) Exactly as name(s)appear on document 1. HRVN Valley Narth,LLC , 2. , Additional names on page of document. Grantee(sl Exactiv as name(sl abbear on document 1 Ciry of Renton 2. , Additional names on page of document. Legal description(abbreviated: i.e.lot,block,plat or secrion,township,range) Lot 4 of 1 st Amendment to Valley Medical Center Narth Campus Binding Site Plan LUA-93-108 BSP,LND-35-007, Vol 166,pgs 89-93,according to the plat thereof recorded in Vol 279 of Plats,pgs 86 through 89,inclusive,in King County,WA(Hereinafter,the"lease land") Assessor's Pronertv Tax Parcel/Account Number ❑Assessor Tax#not yet assigned gg57670040 The Auditor/Recordcr will rely on thc information providcd on this form. Thc staff will not rcad thc documcnt to veri the accurac or com leteness of the indexin information rovided herein. "I am signing below and paying an additional$50 recording fee(as provided in RCW 36.18.010 and referred to as an emergency nonstandard document),because this document does not meet margin and formatting requirements.Furthermore,I hereby understand that the recording process may cover up or otherwise obscure some part of the text of the original document as a result of this request." Signature of Requesting Party Note to submitter:Do not sign above nor pay additional$50 fee if the document meets margin/formatting requirements Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-2 of 23 Record Date:4/26/2023 12:15 PM King County,WA Return Address: City Clerk's Office City of Renton 1055 5 Grady Way Renton,WA 98057 DECLARATION OF COVENANT FOR INSPECTION AND MAINTENANCE OF DRAINAGE FACILITIES AND ON-SITE BMPS Grantor: HRVN Valley North, LLC Grantee: Citv of Renton, a Washin�ton municipal corporation Legal Description: Reference Exhibit C Assessor's Tax Parcel ID#: 8857670040 IN CONSIDERATION of the approved City of Renton (checkone of thefollowing) ❑ Residential Building Permit �Commercial Building Permit ❑Clearing and Grading Permit ❑✓ Civil Construction or Utility Permit for Permit(s)C17002806 (construction/auiiding/utiiityPermit�r)relating to the real property ("Property") described above, the Grantor(s), the owner(s) in fee of that Property, hereby covenants (covenant)with the City of Renton ("City of Renton" or"City"), a municipal corporation of the state of Washington,that he/she(they)will observe,consent to,and abide by the conditions and obligations set forth and described in Paragraphs 1 through 9 below with regard to the Property, and hereby grants (grant) an easement as described in Paragraphs 2 and 3. Grantor(s) hereby grants(grant),covenants(covenant), and agrees(agree) as follows: 1. The Grantor(s)or his/her(their)successors in interest and assigns("Owners")shall at their own cost,operate, maintain, and keep in good repair,the Property's drainage facilities constructed as required in the approved construction plans and specifications TED-40-3964 (Project Plan#) on file with the City of Renton and submitted to the City of Renton for the review and approval of permit(s) C17002806 (Construction/euilding/UtilityPermit#J.The Property's drainage facilities are shown and/or listed on Exhibit A—Site Plan. The Property's drainage facilities shall be maintained in compliance with the operation and maintenance schedule included and attached herein as Exhibit B—Operations and Maintenance. Drainage facilities include pipes, channels, flow control facilities, water quality facilities, on-site best management practices (BMPs) and other engineered structures designed to manage and/or Page 1 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-3 of 23 Record Date:4/26/2023 12:15 PM King County,WA treat stormwater on the Property. On-site BMPs include dispersion and infiltration devices, bioretention, permeable pavements, rainwater harvesting systems, tree retention credit, reduced impervious surFace footprint,vegetated roofs and other measures designed to mimic pre-developed hydrology and minimize stormwater runoff on the Property. 2. City of Renton shall have the right to ingress and egress over those portions of the Property necessary to perform inspections of the stormwater facilities and BMPs and conduct maintenance activities specified in this Declaration of Covenant and in accordance with the Renton Municipal Code. City of Renton shall provide at least thirty(30) days' written notice to the Owners that entry on the Property is planned for the inspection of drainage facilities.After the thirty(30) days,the Owners shall allow the City of Renton to enter for the sole purpose of inspecting drainage facilities. In lieu of inspection by the City,the Owners may elect to engage a licensed civil engineer registered in the state of Washington who has expertise in drainage to inspect the drainage facilities and provide a written report describing their condition. If the engineer option is chosen,the Owners shall provide written notice to the City of Renton within fifteen (15)days of receiving the Cit�s notice of inspection.Within thirty(30)days of giving this notice,the Owners,or engineer on behalf of the Owners,shall provide the engineer's report to the City of Renton. If the report is not provided in a timely manner as specified above,the City of Renton may inspect the drainage facilities without further notice. 3. If City of Renton determines from its inspection, or from an engineer's report provided in accordance with Paragraph 2,that maintenance, repair, restoration, and/or mitigation work is required to be done to any of the drainage facilities, City of Renton shall notify the Owners of the specific maintenance, repair, restoration, and/or mitigation work ("Work") required pursuant to the Renton Municipal Code. The City shall also set a reasonable deadline for the Owners to complete the Work, or to provide an engineer's report that verifies completion of the Work. After the deadline has passed, the Owners shall allow the City access to re-inspect the drainage facilities unless an engineer's report has been provided verifying completion of the Work. If the Work is not completed within the time frame set by the City, the City may initiate an enforcement action and/or perform the Work and hereby is given access to the Property for such purposes. Written notice will be sent to the Owners stating the City's intention to perform such Work.This Work will not commence until at least seven(7)days after such notice is mailed. If, within the sole discretion of the City, there exists an imminent or present danger, the seven (7) day notice period will be waived and Work will begin immediately. 4. The Owners shall assume all responsibility for the cost of any Work,or any measures taken by the City to address conditions as described in Paragraph 3. Such responsibility shall include reimbursement to the City within thirty(30)days of the receipt of the invoice for any such Work performed. Overdue payments will require payment of interest at the maximum legal rate allowed by RCW 19.52.020(currently twelve percent(12%)). If the City initiates legal action to enforce this agreement, the prevailing party in such action is entitled to recover reasonable litigation costs and attorney's fees. 5. The Owners are required to obtain written approval from City of Renton prior to filling, piping, cutting, or removing vegetation (except in routine landscape maintenance) in open vegetated stormwater facilities (such as swales, channels, ditches, ponds, etc.), or performing any alterations or modifications to the drainage facilities referenced in this Declaration of Covenant. Page 2 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-4 of 23 Record Date:4/26/2023 12:15 PM King County,WA 6. Any notice or consent required to be given or otherwise provided for by the provisions of this Agreement shall be effective upon personal delivery,or three (3) days after mailing by Certified Mail, return receipt requested. 7. With regard to the matt�rs addressed herein,this agreement constitutes the entire agreement between the parties, and supersedes all prior discussions, negotiations, and all agreements whatsoever whether oral or written. 8. This Declaration of Covenant is intended to protect the value and desirability and promote efficient and effective management of surFace water drainage of the real property described above, and shall inure to the benefit of all the citizens of the City of Renton and its successors and assigns. This Declaration of Covenant shall run with the land and be binding upon Grantor(s), and Grantor's(s') successors in interest, and assigns. 9. This Declaration of Covenant may be terminated by execution of a written agreement by the Owners and the City that is recorded by King County in its real property records. IN WITNESS WHERECIF, this l��ciaration of Cnvenant for the Inspection and Maintenance af Drainage Facilities is execut�d th�s, '� day c►� °�'� �,. � 2C! � . ..�,,..� GRANTOR, owner af the Prqperty GRANTOR, awner of the Property ..�.�R�N�G`'>��` '..� ��°��"�C�FM��b��° �S } Cca u rv�ry a��a� �ss. ��;�� C1n this day personally a�peared befare me: �-�l L-�9=� .� _.�' �-,�.�m,� to me known to be the individual(s) described in and wk�o �xec�a��d the �+rithin and faregoing instrument and acknawledged that they signed the same as th�ir fre�arad volurrtary�ct and deed,for the uses and purpases therefn stated. Given under rray har�d �rad offaciaf s�al this��°��day o� C��7�"r:�� _.�;,20"�-� ��r��we��y�� *,.�� .�.� �� "� �r � ��'��'�y�� i_�7_.��C...C�.� ��-� = ��"� � PC`I11$�4� f1c�t1"Y� d�� '�� t�c�tary G�ublic in anc�fc�r the State c�f � �� a�� ,� �a�, r�siding at . � � � � W � ., . . .„ ,: � � :�� "'`• •�• � � ;. � M a ointmen � CF��6 �"�a �� `�� ¢�t ��"�' , ��"��rre�awe�� Y PP � texpires �`�'' ��- �C�� Page 3 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-5 of 23 Record Date:4/26/2023 12:15 PM King County,WA Exhibit A: Site Plan �RAPH�c scA�E LIMITS OF WORK � � 4 � ` \ � �t Y".�2� � � � .... � z � J� 6� �20 � � �\ �{. ¢��n. t�U.�1��t . ,..� i�� '��£4� .,.. 9' = 60 FEET �>��'� `�,� ��4r�( � � � i . �� ,:.v.1 �� y��„1.�...t i� i ................ I�.� !!,I � Ii ��I� •.S ��..,�'� y� � �� f „, �r i 4 ` ArV� � . i t y ,vj �! � . i I.. . � � -flw h 51 1� re(.�.IW4 Et >:' r Sr e, wh� ' 4h � YS� k . ,,. � � 11S�� f r4 � ( � �r �� ' Q � "�' ° ;I [, � t { �3�ry� y�Y )wtPq � � � � S � " (� � ( � 1 3R� IhI ( � �� µ � t . ( ai �..� .Q � .r�� .,+� »� Y�� J � �. , .. � i � .. ..... � { � � . ,� �� E.,M :� � i� "{ (� Shra�u;r.mk'7 s. �1 `�� ' .. .� ( I � ,,... am,w. :... ....,,v�." ,., .. .�....� � e Y '� �, S �� , � ��. �,, � �� ; ��, ��'ULAR WETLAN� �me� � � �� i _ .. N � , r �` _ � _ i �e � i�`� o � � � � � �� I � � . _ � £ �� ( r ; �� , MOD D � �� ...�� e � �� . .. ,� I �( f f �� ' VEGETATED ROOF f I t� � _� � � o l , , R��i � � � � � �I�� „� ;� iC I ' '� � �. s �; f I �� '�� "i� �f � � DETENTION VAULT ` � 't� � ` � � , � � � , � � . . , , �� < <� �,11 �� ( ij �o�� ;� �� . � �� , i _� �C j'�' ;:, �;} I fl MEDICAL ( i t�: yir,��. o �� OFFICE � � e. �tii � ,� i�� r:, �`__I �1 BUILDING `� i� �F� � � G (� �° � �� d � t �t ��:�:i k� . i DETENTIDN VAULT �( i �`' . �Fe.. ��. �� i E i i G�� ... � � � `f�� .__ � � � „ ,a � ( �I ` €? ( DETENTION VAULT k �� +� .- w 0 � i '„ � l{ � � ... �� Ij� �`� ,i Y � ( � � � � � �f � �� t ,. � $� l I � � �� 7� �� o (�� ( � � � �� ° � .,. � � ' t� � � .�� r ( � (I (" � �,� s�� (C�; C�� j�4� � 4y`� �: O � � �� ( � I ' � �� . C _ ( i � � a � ( ,�r � � , �� _ ,_. , t R � � ; � � , �� _� '�� I� � �� .. � �s� f� ,� � � � � (� ' � �) � � �.. J � � f X � I 4 � � � �7 . k ,. b �„at.. � � � ��,��" � .� , ..`.t�A �d,A�', . ¢._... __... :s,?� .+.o,.. ; ..svnx� ,."., __ _ �, . � t ._.. ..� . .,.. (�..:. � ..ri � a ,, , _,. .�.. ..r�+��y�"� � . �{ I (�''�`\fz. �,�I ... y��Y `�� „ ........ �j O� f ' �n, 3�. �� ,,.n,.�n „� . �_� � ,�y , �,,, �,N, �� j a � �., �, .�,�z,T " i . irr�.,.,��,,, �k n � o.. . �.�•" .,- . � ,_ � ,.. � � ' LIMITS OF WORK ��°v fj �i�._ o �w. . � t�� i ,s �� .. ._ "tj _.. _., ti`E � �4k � A! y... ....,._... ... .. . �. f �,..:�v, � �n ,,,�.., ,.:. I , � � �� t� � }� ..�� ' ' V, i� ,v � („ � � p ,. , _.a.� .::. -� `�j 4 � ��,![..�.,, _ , . . ��, Lp � I � � I () �(Sf t t°. 1 .. � ��,n. � ,M,.,� ,.<<,.e�,. ..,� /� 47 �., (I � »�„�t._ . ,,,.I_., -„w�) � Il � �..� t� I� aJ � scA�E: For: UW MEDI�INE �oe NUMeER HOR�zoNTA� ��=60� �ERT��A� N�A VALLEY MEDICAL CENTER 1��9� GHA V �82�5 72N� AVENUE SouTH F' s KENT WA 98032 m� � �425>251-6zzz MEDICAL OFFICE BLDG. a� a (4z5)z5�-8�8z FAx Title: SHEEr sa �� _ �� EN��NEER�N�, �No MAINTENANCE CQVENANT Gl�.� '�� Pg` P�ANNiN�, suRVEYiN�, 'EXHI�IT A' Pa e 4 of 22 ��' ENO�N�� ENVIRONMENTAL SERVICES � DESIGNED XXX DRAWN ZTW CHECKED AS APPROVE� AS DATE 12 29 17 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-6 of 23 Record Date:4/26/2023 12:15 PM King County,WA EXHIBIT B OPERATIONS AND MAINTENANCE MAN UAL Page 5 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-7 of 23 Record Date:4/26/2023 12:15 PM King County,WA APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS � ., , � �+t�i► � DEl"�NT14►I�1'TAN1f�'ANQ i�AULTS MAINTENANCE DEFECT OR CONDITIONS WHEN RESULTS EXPECTED WHEN COMPONENT PROBLEM MAINTENANCE IS NEEDED MAINTENANCE IS PERFORMED Site Trash and debris Any trash and debris which exceed 1 cubic Trash and debris cleared from site. foot 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 Noxious and nuisance vegetation removed may constitute a hazard to City personnel according to applicable regulations.No or the public. danger of noxious vegetation where City personnel or the public might normally be. Contaminants and Any evidence of contaminants or pollution Materials removed and disposed of pollution such as oil,gasoline,concrete slurries or according to applicable regulations.Source paint. control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Excessive growth of Grass or groundcover exceeds 18 inches Grass or groundcover mowed to a height grass/groundcover in height. no greater than 6 inches. Tank or Vault Trash and debris Any trash and debris accumulated in vault No trash or debris in vault. Storage Area or tank(includes floatables and non- floata6les). Sediment Accumulated sediment depth exceeds All sediment removed from storage area. accumulation 10%of the diameter of the storage area for '/length of storage vault or any point depth exceeds 15%of diameter.F�cample: 72-inch storage tank would require cleaning when sediment reaches depth of 7 inches for more than'/length of tank. Tank Structure Plugged air vent Any blockage of the vent. Tank or vault freely vents. Tank bent out of Any part of tank/pipe is bent out of shape Tank repaired or replaced to design. shape more than 10%of its design shape. Gaps between A gap wider than'/:-inch at the joint of any No water or soil entering tank through sections,damaged tank sections or any evidence of soil joints or walls. joints or cracks or particles entering the tank at a joint or tears in wall through a wall. Vault Structure Damage to wall, Cracks wider than'/sinch,any evidence of Vault is sealed and structurally sound. frame,bottom,and/or soil entering the structure through cracks top slab or qualified inspection personnel determines that the vault is not structurally sound. Inlet/Outlet Pipes Sediment Sediment filling 20%or more of the pipe. InleUoutlet pipes clear of sediment. accumulation Trash and debris Trash and debris accumulated in No trasli or debris in pipes. inleUoutlet pipes(includes floatables and non-floatables). Damaged inleUoutlet Cracks wider than'/sinch at the joint of the No cracks more than'/-inch wide at the pipes inleUoutlet pipes or any evidence of soil joint of the inleUoutlet pipe. enterinc�at the joints of the inlet/outlet pipes. Access Manhole Cover/lid not in place Cover/lid is missing or only partially in Manhole access covered. place.My open manhole requires immediate maintenance. Page 6 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-8 of 23 Record Date:4/26/2023 12:15 PM King County,WA APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-5ITE BMPS ,, - „ .. 141t�r � pETE1VT1f�N TANIKS ANC1��IJLTS MAINTENANCE DEFECT OR CONDITIONS WHEN RESULTS EXPECTED WHEN COMPONENT PROBLEM MAINTENANCE IS NEEDED MAINTENANCE IS PERFORMED Access Manhole Locking mechanism Mechanism cannot be opened by one Mechanism opens with proper tools. (cont.) not working maintenance person with proper tools. Bolts cannot be seated.Self-locking cover/lid does not work. Cover/lid di�cult to One maintenance person cannot remove Cover/lid can be removed and reinstalled remove cover/lid after applying 80 Ibs of lift. by one maintenance person. Ladder rungs unsafe Missing rungs,misalignment,rust,or Ladder meets design standards.Allows cracks. maintenance person safe access. Large access Damaged or difficult Large access doors or plates cannot be Replace or repair access door so it can doors/plate to open opened/removed using normal equipment. opened as designed. Gaps,doesn't cover Large access doors not flat and/or access Doors close flat;covers access opening completely opening not completely covered. completely. Lifting rings missing, Lifting rings not capable of lifting weight of Lifting rings sufficient to lift or remove door rusted door or plate. or plate. Page 7 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-9 of 23 Record Date:4/26/2023 12:15 PM King County,WA APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS , t I�d 4 C�3NTa4L+'�i�l`�U�.`TI�R"�f�E�W RiE.S"�'RIC'�.'�C1R' ,,. MAINTENANCE DEFECT OR CONDITION WHEN MAINTENANCE RESULTS EXPECTED WHEN COMPONENT PROBLEM IS NEEDED MAINTENANCE IS PERFORMED Structure Trash and debris Trash or debris of more than%cubic foot No Trash or debris blocking or potentially which is located immediately in front of the blocking entrance to structure. structure opening or is blocking capacity of the structure hy more than 10%. Trash or debris in the structure that No trash or debris in the structure. exceeds'/s the depth from the bottom of basin to invert the lowest pipe into or out of the basin. Deposits of garbage exceeding 1 cubic No condition present which would attract or foot in volume. support the breeding of insects or rodents. Sediment Sediment exceeds 60%of the depth from Sump of structure contains no sediment. accumulation tlie bottom of tlie structure to tlie invert of the lowest pipe into or out of the structure or the hottom of the FROP-T section or is within 6 inches of the invert of the lowest pipe into or out of the structure or the bottom of the FROP-T section. Damage to frame Comer of frame extends more than$/inch Frame is even with curb. and/or top slab past curb face into the street(If applicable). Top slab has holes larger than 2 square Top slab is free of holes and cracks. inches or cracks wider than'/inch. Frame not sitting flush on top slab,i.e., Frame is sitting flush on top slab. separation of more than'/4 inch of the frame from the top slab. Cracks in walls or Cracks wider than'/2 inch and longer than Structure is sealed and structurally sound. bottom 3 feet,any evidence of soil particles entering structure through cracks,or maintenance person judges that structure is unsound. Cracks wider than'/z inch and longer than No cracks more than'!4 inch wide at the 1 foot at the joint of any inlet/outlet pipe or joint of inleUoutlet pipe. any evidence of soil particles entering structure through cracks. SettlemenU Structure has settled more than 1 inch or Basin replaced or repaired to design misalignment has rotated more than 2 inches out of standards. alignment. Damaged pipe joints Cracks wider than'/�-inch at the joint of the No cracks more than'/-inch wide at the inleUoutlet pipes or any evidence of soil joint of inlet/outlet pipes. entering the structure at the joint of the inleUoutlet pipes. Contaminants and Any evidence of contaminants or pollution Materials removed and disposed of pollution such as oil,gasoline,concrete slurries or according to applicable regulations.Source paint. control BMPs implemented if appropriate. No contaminants present other than a surFace oil film. Ladder rungs missinc� Ladder is unsafe due to missing runc�s, Ladder meets desic�n standards and allows or unsafe misalignment,rust,cracks,or sharp edges. maintenance person safe access. FROP-T Section Damaged FROP-T T section is not securely attached to T section securely attached to wall and structure wall and outlet pipe structure outlet pipe. should support at least 1,000 Ibs of up or down pressure. Structure is not in upright position(allow up Structure in correct position. to 10%from plumb). Page 8 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-10 of 23 Record Date:4/26/2023 12:15 PM King County,WA APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-5ITE BMPS �It9► 4 Ct71�TR4L S�'RtJC"'1'UR�LC1iM R�S7RI��"aR t MAINTENANCE DEFECT OR CONDITION WHEN MAINTENANCE RESULTS EXPECTED WHEN COMPONENT PROBLEM IS NEEDED MAINTENANCE IS PERFORMED FROP-T Section Damaged FROP-T Connections to outlet pipe are not Connections to outlet pipe are water tight; (cont.) (cont.) watertight or show signs of deteriorated structure repaired or replaced and works grout. as designed. Any hole�other than designed holes—in Structure has no holes other than designed the structure. holes. Cleanout Gate Damaged or missing Cleanout gate is missing. Replace cleanout gate. cleanout gate Cleanout gate is not watertight. Gate is watertight and works as designed. Gate cannot be moved up and down by Gate moves up and down easily and is one maintenance person. watertight. Chain/rod leading to gate is missing or Chain is in place and works as designed. damaged. Orifice Plate Damaged or missing Control device is not working properly due Plate is in place and works as designed. orifice plate to missing,out of place,or bent orifice plate. Obstructions to orifice Any trash,debris,sediment,or vegetation Plate is free of all obstructions and works plate blocking the plate. as designed. Overflow Pipe Obstructions to Any trash or debris blocking(or having the Pipe is free of all obstructions and works overflow pipe potential of blocking)the overflow pipe. as designed. Deformed or Lip of overflow pipe is bent or deformed. OverFlow pipe does not allow overFlow at damaged lip of an elevation lower than design overFlow pipe InIeUOutlet Pipe Sediment Sediment filling 20%or more of the pipe. InleUoutlet pipes clear of sediment. accumulation Trash and debris Trash and debris accumulated in No trash or debris in pipes. inleUoutlet pipes(includes floatables and non-floatables). Damaged inleUoutlet Cracks wider than Yrinch at the joint of the No cracks more than'/-inch wide at the pipe inleUoutlet pipes or any evidence of soil joint of the inleUoutlet pipe. entering at the joints of the inlet/outlet pipes. Metal Grates Unsafe grate opening Grate with opening wider than'/8 inch. Grate opening meets design standards. (If applicable) Trash and debris Trash and debris that is blocking more Grate free of trash and debris.footnote to than 20%of grate surface. guidelines for disposal Damaged or missing Grate missing or broken member(s)of the Grate is in place and meets design grate grate. standards. Manhole Cover/Lid Cover/lid not in place Cover/lid is missing or only partially in Cover/lid protects opening to structure. place.Any open structure requires urgent 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.Self-locking coverllid does not work. Cover/lid difficult to One maintenance person cannot remove Cover/lid can be removed and reinstalled remove cover/lid after applying 80 Ibs.of lift. by one maintenance person. Page 9 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-11 of 23 Record Date:4/26/2023 12:15 PM King County,WA APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS „ ; Nf�� AT�W BASIW�ANL7 ilA�►1�Ht'�L�� ' MAINTENANCE DEFECT OR CONDITION WHEN MAINTENANCE RESULTS EXPECTED WHEN COMPONENT PROBLEM IS NEEDED MAINTENANCE IS PERFORMED Structure Sediment Sediment exceeds 60%of the depth from Sump of catch basin contains no sediment. accumulation the bottom of the catch basin to the invert of the 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%cubic foot No Trash or debris blocking or potentially which is located immediately in front of the blocking entrance to catch basin. catch basin opening or is blocking capacity of the catch basin by more than 10%. Trash or debris in the catch basin that No trash or debris in the catch basin. exceeds'/3 the depth from the bottom of basin to invert the lowest pipe into or out of the basin. Dead animals or vegetation that could No dead animals or vegetation present generate odors that could cause within catch basin. complaints or dangerous gases(e.g., methane). Deposits of garbage exceeding 1 cubic No condition present which would attract or foot in volume. support the breeding of insects or rodents. Damage to frame Comer of frame extends more than s/inch Frame is even with curb. and/or top slab past curb face into the street(If applicable). Top slab has holes larger than 2 square Top slab is free of holes and cracks. inches or cracks wider than'/inch. Frame not sitting flush on top slab,i.e., Frame is sitting flush on top slab. separation of more than 3/4 inch of the frame from the top slab. Cracks in walls or Cracks wider than'/�inch and longer than Catch basin is sealed and is structurally bottom 3 feet,any evidence of soil particles sound. entering catch basin through cracks,or maintenance person judges that catch basin is unsound. Cracks wider than'/z inch and longer than No cracks more than'/4 inch wide at the 1 foot at the joint of any inlet/outlet pipe or joint of inleUoutlet pipe. any evidence of soil particles entering catch basin through cracks. SettlemenU Catch basin has settled more than 1 inch Basin replaced or repaired to design misalignment or has rotated more than 2 inches out of standards. alignment. Damaged pipe joints Cracks wider than'/z-inch at the joint of the No cracks more than'/-inch wide at the inleUoutlet pipes or any evidence of soil joint of inleUoutlet pipes. entering the catch basin at the joint of the inleUoutlet pipes. Contaminants and Any evidence of contaminants or pollution Materials removed and dispased of pollution such as oil,gasoline,concrete slurries or according to applicable regulations.Source paint. control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Inlet/Outlet Pipe Sediment Sediment filling 20%or more of the pipe. Inlet/outlet pipes clear of sediment. accumulation Trash and debris Trash and debris accumulated in No trash or debris in pipes. inleUoutlet pipes(includes floatables and non-floatables). Page 10 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-12 of 23 Record Date:4/26/2023 12:15 PM King County,WA APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-5ITE BMPS „ ,,: , � ��» .g '�r��r�`Bi�.�"i��'r�Q�14��L�� ... ,,,,,,�' MAINTENANCE DEFECT OR CONDITION WHEN MAINTENANCE RESULTS EXPECTED WHEN COMPONENT PROBLEM IS NEEDED MAINTENANCE IS PERFORMED InIeUOutlet Pipe Damaged inleUoutlet Cracks wider than Yrinch at the joint of the No cracks more than'/-inch wide at the (cont.) pipe inleVoutlet pipes or any evidence of soil joint of the inleUoutlet pipe. entering at the joints of the inleUoutlet pipes. Metal Grates Unsafe grate opening Grate with opening wider than'/8 inch. Grate opening meets design standards. (Catch Basins) Trash and debris Trash and debris that is blocking more Grate free of trash and debris.footnote to than 20%of grate surface. guidelines for disposal Damaged or missing Grate missing or broken member(s)of the Grate is in place and meets design grate c�rate.Any open structure requires standards. urgent maintenance. Manhole CovedLid Covedlid not in place Covedlid is missing or only partially in Cover/lid protects opening to structure. place.Any open structure requires urgent 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.Self-locking cover/lid does not work. Covedlid difficult to One maintenance person cannot remove Covedlid can be removed and reinstalled remove cover/lid after applying 80 Ibs.of lift. by one maintenance person. Page 1 1 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-13 of 23 Record Date:4/26/2023 12:15 PM King County,WA APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS I;MVt�. 6-�Cfl!WVL�f�iNC�PfiP��AhttJ DITCHE� '� t MAINTENANCE DEFECT OR CONDITIONS WHEN RESULTS EXPECTED WHEN COMPONENT PROBLEM MAINTENANCE IS NEEDED MAINTENANCE IS PERFORMED Pipes Sediment&debris Accumulated sediment or debris that Water flows freely through pipes. accumulation exceeds 20%of the diameter of the pipe. Vegetation/root Vegetation/roots that reduce free Water flows freely through pipes. growth in pipe movement of water through pipes. Contaminants and Any evidence of contaminants or pollution Materials removed and disposed of pollution such as oil,gasoline,concrete slurries or according to applicable regulations.Source paint. control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Damage to protective Protective coating is damaged;rust or Pipe repaired or replaced. coating or corrosion corrosion is weakening the structural integrity of any part of pipe. Damaged pipes Any dent that decreases the cross section Pipe repaired or replaced. area of pipe by more than 20%or is determined to have weakened structural integrity of the pipe. Ditches Trash and debris Trash and debris exceeds 1 cubic foot per Trash and debris cleared from ditches. 1,000 square feet of ditch and slopes. Sediment Accumulated sediment that exceeds 20% Ditch cleaned/flushed of all sediment and accumulation of the design depth. debris so that it matches design. Noxious weeds Any noxious or nuisance vegetation which Noxious and nuisance vegetation removed may constitute a hazard to City personnel according to applicable regulations.No or the public. danger of noxious vegetation where City personnel or the public might normally be. Contaminants and Any evidence of contaminants or pollution Materials removed and disposed of pollution such as oil,gasoline,concrete slurries or according to applicable regulations.Source paint. control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Excessive vegetation Vegetation that reduces free movement of Water flows freely through ditches. growth water 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 ewsts above Replace rocks to design standards. place or missing(If native soil area 5 square feet or more,any applicable) exposed native soil. Page 12 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-14 of 23 Record Date:4/26/2023 12:15 PM King County,WA APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-5ITE BMPS , „ , `NC`f 1ti �-�R+F'JUIVDS(LAh1DaCAPl1�� MAINTENANCE DEFECT OR CONDITIONS WHEN RESULTS EXPECTED WHEN COMPONENT PROBLEM MAINTENANCE IS NEEDED MAINTENANCE IS PERFORMED Site Trash and debris Any trash and debris which exceed 1 cubic Trash and debris cleared from site. foot 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 Noxious and nuisance vegetation removed may constitute a hazard to City personnel according to applicable regulations.No or the public. danger of noxious vegetation where City personnel or the public might normally be. Contaminants and Any evidence of contaminants or pollution Materials removed and disposed of pollution such as oil,gasoline,concrete slurries or according to applicable regulations.Source paint. control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Excessive growth of Grass or groundcover exceeds 18 inches Grass or groundcover mowed to a height grass/groundcover in height. no greater than 6 inches. Trees and Shrubs Hazard tree identified Any tree or limb of a tree identified as No hazard trees in facility. having a potential to fall and cause properly damage or threaten human life.A hazard tree identified by a qualified arborist must be removed as soon as possible. Damaged tree or Limbs or parts of trees or shrubs that are Trees and shrubs with less than 5%of total shrub identified split or broken which affect more than 25% foliage with split or broken limbs. of the total foliage of the tree or shrub. Trees or shrubs that have been blown No blown down vegetation or knocked over down or knocked over. vegetation.Trees or shrubs free of injury. Trees or shrubs which are not adequately Tree or shrub in place and adequately supported or are leaning over,causing supported;dead or diseased trees exposure of the roots. removed. Page 13 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-15 of 23 Record Date:4/26/2023 12:15 PM King County,WA APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS I; ��.�r� "��i��T��r�P; 4� MAINTENANCE DEFECT OR CONDITIONS WHEN RESULTS EXPECTED WHEN COMPONENT PROBLEM MAINTENANCE IS NEEDED MAINTENANCE IS PERFORMED Preventive Vegetation Vegetation to be watered and pruned as Healthy vegetation growth with full needed to maintain healthy growth. coverage as designed. Site Trash and debris Trash and debris has accumulated on the Vegetated roof free of any trash or debris. vegetated roof. Waterproof Leaking waterproof Waterproof inembrane breached. Waterproof inembrane has no tears or Membrane membrane holes allowing water through it. Drainage Layer Drainage pathway Drainage layer flow plugged or obstructed. Drainage layer passing water with no plugged/obstructed obstruction. Drainage Overflow obstructed Drainage of overflow is obstructed. Overflow has no obstruction. Growth Media Compaction Soil in the growth media area compacted. No part of the growth media is compacted. Erosion Growth media washed out. Growth media is not being washed away. Insufficient nutrients Plants are not thriving. Growth media has proper nutrients to support plant growth. Vegetation Insufficient vegetation Vegetation species not succulents,grass, Correct species of vegetation is used. herbs, and/or wildflowers adapted to harsh conditions. Poor vegetation Healthy vegetation covers less than 90%of Healthy vegetation covers more than 90% coverage vegetation area. of vegetation area. Undesirable Weeds and other undesirable plants are No undesirable vegetation occurs in the vegetation invading more than 10%of vegetated area. vegetated area.No herbicides or pesticides used to control undesirable vegetation. Poor vegetation Special vegetation not thriving. Special vegetation is kept healthy and growth inspected on frequent schedule. Border Zone Access restricted Border zone limited by vegetation Border zone is kept open so vegetated overgrowth or other means. area is accessible. Gravel Stop Overflow uncontained Gravel stop does not contain overflow or Overflow water is only exits from the divert it to a designed outlet. designed outlet. Page 14 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-16 of 23 Record Date:4/26/2023 12:15 PM King County,WA MAINTENANCE INSTRUCTIONS FOR VEGETATED ROOFS Your property contains an on-site BMP(best management practice)called a"vegetated roof,"which was installed to minimize the stormwater runoff impacts of the impervious surfaces on your property. Vegetated roofs(also called green roofs) consist of a pervious growing medium,plants, and a moisture barrier.The benefits of this device are a reduction in runoff peaks and volumes due to the storage capabilities of the soil and increased rate of evapotranspiration. This on-site BMP shall be maintained per Appendix A of the City of Renton's Surface Water Design Manual. MAINTENANCE RESTRICTIONS • The composition and area of vegetated roof as depicted by the site plan and design details must be maintained and may not be changed without written approval from the City of Renton or through a future development permit from the City of Renton. • Vegetated roofs must not be subject to any use that would significantly compact the soil. INSPECTION FREQUENCY AND MAINTENANCE GUIDELINES Vegetated roofs(also called green roofs) consist of a pervious growing medium,plants,and a moist�ure barrzer: • Vegetated roofs must be inspected annually for physical defects and to make sure the vegetation is in good condition. • If erosion channels or bare spots are cvidcnt,thcy should be stabilizcd with additional soil similar to the original material. • A supplemental watering program may be needed the first year to ensure the long-term survival of the roofs vegetation. • Vegetation should be maintained as follows: (1)Vegetated roofs must not be subject to any use that would significantly compact the soil; (2)Replace all dead vegetation as soon as possible; (3)Remove fallen leaves and debris; (4)Remove all noxious vegetation when discovered; (5)Manually weed without herbicides or pesticides RECORDING REQUIREMENT These vegetated roof on-site BMP maintenance and operation instructions must be recorded as an attachment to the required declaration of covenant and grant of easement per Requirement 3 of Section C.1.3.4 of the City of Renton Surface Water Desig�a Ma�aual.The intent of these instructions is to explain to future property owners,the purpose of the BMP and how it must be maintained and operated. These instructions are intended to be a minimum; the City of Renton may require additional instructions based on site-specific conditions. See the City of Renton's Surface Water Design Manual website for additional information and updates. Page 15 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-17 of 23 Record Date:4/26/2023 12:15 PM King County,WA '�'Y�!�CA�.y VEG�T�IT�1J ltC3()F C�2U�S-SF.C"1"�(.l' ; ��.��wx�� .�,..��... C'rr�'wntc�rt�tll�,�,urv5 •---�-�m� . h��a „� �r l 6�sPaatl'alarir .-.,�..,.,.�. q .u,4 ��`��'�� p ,:�`� "� . ,:r�✓ 1 i t�. `� x0 a..i i �✓ insa�iMaawsua ...m...,.,�,�.. ..<,-� �� .✓��. �.�� ';,� .�i ub a,'�a+k'k�z�." P�"^�,n;��O" � ��'��""��'�""�' �ivC�vaa�7am�rrg�rra54etiR�9Ga� .... , ..�., '�.' �*`'� m*,'F�:°� Y�'�y�,��`.�M nrrr€qat�aa6p,r�ri��:^a i � i �� r^*A°r�"7�4 i 5�4�, '� �,�e��'"1� r`r `� �'�� i, ��5✓ :`�' , , �afioad;p Cna�arox65r�rrr� �_.—.... �^. Y'a�, �„•"°'+-'��; �" � �� 1 ��'� �. '�� i �� ( ! ✓ �..✓'� al °� � s0p/g 19fp�"FY`M � l� +'"� '�� Stwuer.+ar�a��su�p�acsrt �....�� d�iPr�r��t��,��A;� � � f ��^� � � q�N��,�.y�,,y,m "k1,f�f P r p/ gppgpE� Ppp ` .,�� `�w._.- d.'ueau7 i�rc ma.e�aki�aaa� �. `�� . ��,�d�dECf��I��gr� .,-'`� �,��,�,u vu�ka a kc r.u,p�..+t7n� �...,., �'� ,�.�� rv�� .'�C� 1, ��{�P� ..�.✓" ",„ rv�c,tl�aoa��rll�re�6'�nHs �. '� � c"�:`��,� ,�,•"` �'�A �„�'� q �,r.a651�„�c'l:s,@ramatlnM ��,, �'��+�'��y�."+-a��"' r ��, .r� � T�,,.....,�fitRt�n l�',xl�.ror�a�' � � . ._ �' r' �'�, rh �tC> 0..'> u".,;��5^.L4%'v`'r t " L, a�,�� .,� �� .,. , j°�, � ��,x�. �., T&ars+�x�airr�rWi� Yaa�r��d'v�Mr ga.7z# ,,��"' gba�f��airca�q�d�rtvil s 6x+�a*t da narui mu,tc� p;�mw k��:0.pvp7�4��iw't! Page 16 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-18 of 23 Record Date:4/26/2023 12:15 PM King County,WA Modular Wetland System - Linear Inspection Guidelines Inspection Summary o Inspect Pre-Treatment, Biofiltration and Discharge Chambers—average inspection interval is 6 to 12 months. • (15-minute average inspection time). o NOTE: Pollutant loading varies greatly from site to site and no two sites are the same. Therefore, the first year requires inspection monthly during the wet season and every other month during the dry season in order to observe and record the amount of pollutant loading the system is receiving. Inspection Overview As with all stormwater BMPs inspection and maintenance on the MWS Linear is necessary. Stormwater regulations require that all BMPs be inspected and maintained to ensure they are operating as designed to allow for effective pollutant removal and provide protection to receiving water bodies. It is recommended that inspections be performed multiple times during the first year to assess the site specific loading conditions. This is recommended because pollutant loading and pollutant characteristics can vary greatly from site to site. Variables such as nearby soil erosion or construction sites, winter sanding on roads, amount of daily traffic and land use can increase pollutant loading on the system. The first year of inspections can be used to set inspection and maintenance intervals for subsequent years to ensure appropriate maintenance is provided. Without appropriate maintenance a BMP will exceed its storage capacity which can negatively affect its continued perFormance in removing and retaining captured pollutants. Inspection Equipment Following is a list of equipment to allow for simple and effective inspection of the MWS Linear: • Modular Wetland Inspection Form • Flashlight • Manhole hook or appropriate tools to remove access hatches and covers • Appropriate traffic control signage and procedures • Measuring pole and/or tape measure. • Protective clothing and eye protection. Page 17 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-19 of 23 Record Date:4/26/2023 12:15 PM King County,WA • 7/16" open or closed ended wrench. • Large permanent black marker(initial inspections only-first year) • Note: entering a confined space requires appropriate safety and certification. It is generally not required for routine inspections of the system. Inspection Steps The core to any successful stormwater BMP maintenance program is routine inspections. The inspection steps required on the MWS Linear are quick and easy. As mentioned above the first year should be seen as the maintenance interval establishment phase. During the first year more frequent inspections should occur in order to gather loading data and maintenance requirements for that specific site. This information can be used to establish a base for long term inspection and maintenance interval requirements. The MWS Linear can be inspected though visual observation without entry into the system. All necessary pre-inspection steps must be carried out before inspection occurs, especially traffic control and other safety measures to protect the inspector and near-by pedestrians from any dangers associated with an open access hatch or manhole. Once these access covers have been safely opened the inspection process can proceed: • Prepare the inspection form by writing in the necessary information including project name, location, date &time, unit number and other info (see inspection form). • Observe the inside of the system through the access hatches. If minimal light is available and vision into the unit is impaired utilize a flashlight to see inside the system and all of its chambers. • Look for any out of the ordinary obstructions in the inflow pipe, pre-treatment chamber, biofiltration chamber, discharge chamber or outflow pipe. Write down any observations on the inspection form. • Through observation and/or digital photographs estimate the amount of trash, debris and sediment accumulated in the pre-treatment chamber. Utilizing a tape measure or measuring stick estimate the amount of trash, debris and sediment in this chamber. Record this depth on the inspection form. • Through visual observation inspect the condition of the pre-filter cartridges. Look for excessive build-up of sediments on the cartridges, any build-up on the top of the cartridges, or clogging of the holes. Record this information on the inspection form. The pre-filter cartridges can further be inspected by removing the cartridge tops and assessing the color of the Page 18 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-20 of 23 Record Date:4/26/2023 12:15 PM King County,WA BioMediaGREEN filter cubes (requires entry into pre-treatment chamber-see notes above regarding confined space entry). Record the color of the material. New material is a light green in color. As the media becomes clogged it will turn darker in color, eventually becoming dark brown or black. Using the below color indicator record the percentage of inedia exhausted. • The biofiltration chamber is generally maintenance free due to the system's advanced pretreatment chamber. For units which have open planters with vegetation it is recommended that the vegetation be inspected. Look for any plants that are dead or showing signs of disease or other negative stressors. Record the general health of the plants on the inspection and indicate through visual observation or digital photographs if trimming of the vegetation is needed. • The discharge chamber houses the orifice control structure and is connected to the outflow pipe. It is important to check to ensure the orifice is in proper operating conditions and free of any obstructions. Generally, the discharge chamber will be clean and free of debris. Inspect the water marks on the side walls. If possible, inspect the discharge chamber during a rain event to assess the amount of flow leaving the system while it is at 100% capacity (pretreatment chamber water level at peak HGL). The water level of the flowing water should be compared to the watermark level on the side walls which is an indicator of the highest discharge rate the system achieved when initially installed. Record on the form is there is any difference in level from watermark in inches. 0% -- Percent Clogged-- 100% New • NOTE: During the first few storms the water level in the outflow chamber should be observed and a 6" long horizontal watermark line drawn (using a large permanent marker) at the water level in the discharge chamber while the system is operating at 100% capacity. This line is a reference point for future inspections of the system: • Water level in the discharge chamber is a function of flow rate and pipe size. Observation of water level during the first few months of operation can be used as a benchmark level for future inspections. The initial mark and all future observations shall be made when system is at 100% capacity(water level at maximum level in pre-treatment chamber). If future water levels are below this mark when system is at 100% capacity this is an indicator that maintenance to the pre-filter cartridges may be needed. • Finalize inspection report for analysis by the maintenance manager to determine if maintenance is required. Using a permanent marker draw a 6 inch - long horizontal line, as shown, at the higher water level in the MWS Linear discharge chamber. Page 19 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-21 of 23 Record Date:4/26/2023 12:15 PM King County,WA Maintenance Indicators Based upon observations made during inspection, maintenance of the system may be required based on the following indicators: • Missing or damaged internal components or cartridges. • Obstructions in the system or its inlet or outlet. • Excessive accumulation of floatables in the pre-treatment chamber in which the length and width of the chamber is fully impacted more than 18". • Excessive accumulation of sediment in the pre-treatment chamber of more than 6" in depth. • Excessive accumulation of sediment on the BioMediaGREEN media housed within the prefilter cartridges. The following chart shows photos of the condition of the BioMediaGREEN contained within the pre-filter cartridges. When media is more than 85% clogged replacement is required. • Overgrown vegetation. • Water level in discharge chamber during 100% operating capacity (pre-treatment chamber water level at max height) is lower than the watermark by 20%. Inspection Notes 1. Following maintenance and/or inspection, it is recommended the maintenance operator prepare a maintenance/inspection record. The record should include any maintenance activities performed, amount and description of debris collected, and condition of the system and its various filter mechanisms. 2. The owner should keep maintenance/inspection record(s) for a minimum of five years from the date of maintenance. These records should be made available to the governing municipality for inspection upon request at any time. 3. Transport all debris, trash, organics and sediments to approved facility for disposal in accordance with local and state requirements. 4. Entry into chambers may require confined space training based on state and local regulations. 5. No fertilizer shall be used in the Biofiltration Chamber. 6. Irrigation should be provided as recommended by manufacturer and/or landscape architect. Amount of irrigation required is dependent on plant species. Some plants may not require irrigation after initial establishment. Page 20 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-22 of 23 Record Date:4/26/2023 12:15 PM King County,WA Modular Wetland System - Linear Maintenance Guidelines Maintenance Summary o Remove Sediment from Pre-Treatment Chamber-average maintenance interval is 12 to 24 months. • (10-minute average service time). o Replace Pre-Filter Cartridge Media-average maintenance interval 12 to 24 months. • (10-15 minute per cartridge average service time). o Trim Vegetation -average maintenance interval is 6 to 12 months. • (Service time varies). Maintenance Overview The time has come to maintain your Modular Wetland System Linear(MWS Linear). To ensure successful and efficient maintenance on the system we recommend the following. The MWS Linear can be maintained by removing the access hatches over the systems various chambers. All necessary pre-maintenance steps must be carried out before maintenance occurs, especially traffic control and other safety measures to protect the inspector and near-by pedestrians from any dangers associated with an open access hatch or manhole. Once traffic control has been set up per local and state regulations and access covers have been safely opened the maintenance process can begin. It should be noted that some maintenance activities require confined space entry. All confined space requirements must be strictly followed before entry into the system. In addition, the following is recommended: • Prepare the maintenance form by writing in the necessary information including project name, location, date &time, unit number and other info (see maintenance form). • Set up all appropriate safety and cleaning equipment. • Ensure traffic control is set up and properly positioned. • Prepare a pre-checks (OSHA, safety, confined space entry) are perFormed. Page 21 of 22 Instrument Number: 20230426000416 Document:COV Rec: $225.50 Page-23 of 23 Record Date:4/26/2023 12:15 PM King County,WA Maintenance Equipment Following is a list of equipment required for maintenance of the MWS Linear: • Modular Wetland Maintenance Form • Manhole hook or appropriate tools to access hatches and covers • Protective clothing, flashlight and eye protection. • 7/16" open or closed ended wrench. • Vacuum assisted truck with pressure washer. • Replacement BioMediaGREEN for Pre-Filter Cartridges if required (order from manufacturer). Maintenance Steps 1. Pre-treatment Chamber (bottom of chamber) A. Remove access hatch or manhole cover over pre-treatment chamber and position vacuum truck accordingly. B. With a pressure washer spray down pollutants accumulated on walls and pre-filter cartridges. C. Vacuum out Pre-Treatment Chamber and remove all accumulated pollutants including trash, debris and sediments. Be sure to vacuum the floor until pervious pavers are visible and clean. D. If Pre-Filter Cartridges require media replacement move onto step 2. If not, replace access hatch or manhole cover. Removal of access hatch to gain access below. Insertion of vacuum hose into separation chamber. Removal of trash, sediment and debris. Fully cleaned separation chamber. 2. Pre-Filter Cartridges (attached to wall of pre-treatment chamber) A. After finishing step 1 enter pre-treatment chamber. B. Unscrew the two bolts holding the lid on each cartridge filter and remove lid. C. Place the vacuum hose over each individual media filter to suck out filter media. D. Once filter media has been sucked use a pressure washer to spray down inside of the cartridge and it's containing media cages. Remove cleaned media cages and place to the side. Once removed the vacuum hose can be inserted into the cartridge to vacuum out any remaining material near the bottom of the cartridc�e. Page 22 of 22