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2022-93980DOC# 2022-0093980 `� I llllll lllll llill lllll llll llllll lllll 11 11 IIII IIIII IIIII IIIII IIII IIII Recording Requested By: Mar 02, 2022 12:16 PM OFFICIAL RECORDS Ernest J. Dronenburg, Jr., City Engineer SAN DIEGO COUNTY RECORDER FEES: $218.00 (SB2 Atkins: $75.00) When Recorded Mail to: PAGES: 44 City Clerk City of Encinitas 505 South Vulcan Avenue Encinitas CA 92024 SPACE ABOVE FOR RECORDER'S USE MAINTENANCE AGREEMENT FOR PRIVATE STORMWATER TREATMENT AND STORMWATER POLLUTION CONTROL AND HYDROMODIFICATION MANAGEMENT FACILITIES BY HOMEOWNER'S ASSOCIATION APN: 254-612-12 Case No.: MULTI-003524-2019 Address: 1150 Quail Gardens Drive Permit No.: LDEV-013935-2021 THIS AGREEMENT is between the City of Encinitas, a municipal corporation, hereinafter referred to as the ,"City", and Shea Homes Limited Partnership, its heirs, successors, and assigns, collectively hereinafter referred to as "Developer", owner(s) of that certain real property hereinafter referred to as "Property" that is described in Exhibit "A", which is attached hereto and made a part hereof. This Agreement is for the periodic Maintenance of certain private stormwater treatment, pollution control, and hydromodification management facilities, hereinafter referred to collectively as "Stormwater Facilities". Stormwater Facilities include but are not limited to Best Management Practices (BMPs), Integrated Management Practices (IMPs), Low Impact Development (LID) features, Hydromodification Management Plan (HMP) facilities, structural stormwater treatment devices, and drainage facilities. The description and plat of Stormwater Facilities is set forth in Exhibit "B" which is, attached hereto and made a part hereof. The term Maintenance is defined in Paragraph 1 below. WHEREAS, this Agreement is required by the City as condition of approval of a City permit pursuant to City of Encinitas Municipal Code Chapter 20.08 and Chapter 23.24 as well as the City of Encinitas Stormwater Manual; and WHEREAS, the Stormwater Facilities described in Exhibit "B" benefit said Property, the developer, and the future owners of the lots/parcels created per Tentative Map Case No. SUB-003526-2019, their heirs, successors, and assigns, collectively hereinafter referred to as "Owners"; and WHEREAS, City requires that Developer establish a homeowners association in conformance with the California Civil Code Sections 1350 through 1376, hereinafter referred to as "HOX, to be responsible for the Maintenance of Stormwater Facilities into perpetuity; and WHEREAS, it is the desire of the City, the responsibility of the Owners, HOA, and Developer, herein after collectively referred to as "Parties", and to the benefit of the Public that Maintenance of said Stormwater Facilities occur on a regular and periodic basis as necessary to preserve the Storm Water Facilities in good -working order by the Parties in accordance with the minimum Maintenance requirements set forth in Exhibit "C", which is attached hereto and made a part hereof, and in accordance with the City of Encinitas Municipal Code, the Encinitas Stormwater Manual, and other related City policies and requirements; and WHEREAS, it is responsibility of the Developer and HOA to manage and oversee Maintenance of Stormwater Facilities and to assign a single point of contact between the City of Encinitas and HOA or Developer; and WHEREAS, Developer's responsibility of Maintenance of Stormwater Facilities will be transferred to HOA after the sale of all lots/parcels, the completion of development, and the approval of the City; and WHEREAS, following Developer's completion of the development and acceptance by the City, the Owners are responsible to continuously have an HOA for purposes of Maintenance of the Stormwater Facilities; and WHEREAS, for the purpose of this agreement, Maintenance responsibilities mentioned on this agreement equally and collectively apply to Owners and the HOA; WHEREAS, it is requirement of development that this Agreement constitute a covenant running with the land, binding upon each successive owner of all or any portion of the Property into perpetuity; NOW THEREFORE, IT IS HEREBY AGREED FOR VALUABLE CONSIDERATION AS FOLLOWS: 1. This agreement establishes the Parties' Maintenance requirements for the Stormwater Facilities. The term "Maintenance" wherever capitalized in this agreement shall include, but shall not be limited to: inspection for purposes of identifying operational deficiencies in the Stormwater Facilities, routine upkeep and repair of the Stormwater Facilities in proper working order as determined by the City, and preparation and submittal of the annual inspection report to the City, all as set forth in subparagraph 1.i) through 1.iii). The Parties' requirements for providing Stormwater Facilities Maintenance as stated in this agreement shall mean Maintenance managed and paid for by the Parties, and performed by a qualified contractor hired by the Parties. i) The Parties shall inspect the Stormwater Facilities after all major storms. In addition, the Parties shall inspect the Stormwater Facilities at the minimum frequency specified in Exhibit "C", but not less than twice per year. ii) The Parties shall provide upkeep and repair to keep the Stormwater Facilities in good working order and shall repair all deficiencies identified in the Parties' inspections no later than 30 days following the inspection or prior to the next anticipated rain event. Interim water quality control measures shall be utilized to protect damaged or deficient Stormwater Facilities until such time as the Facilities are repaired. The minimum upkeep and repair frequency shall be consistent with the Exhibit "C" but not less than once per year. To the satisfaction of the Director of Engineering Services, the Parties shall ensure that the Stormwater Facilities are in proper working order for the rainy season, which starts on October 1. iii) The Parties shall obtain the City of Encinitas Stormwater Inspection Report form from the City website or the City of Encinitas Civic Center, complete the inspection report form, and submit the inspection report to the City of Encinitas Department of Engineering Services. Prior to the submittal of the inspection report to the City, the Parties shall perform an inspection of the Stormwater Facilities, identify deficiencies, and repair and correct all deficiencies. The inspection report shall be submitted to the City once a year between August 1 and September 30. 2. The Property is benefited by this Agreement, and it is the purpose of the signatories hereto that this instrument be recorded to the end and intent that the obligation hereby created shall be and constitute a covenant running with the land. Any heirs, executors, administrators, assignees, and/or successors in interest to all or any portion of the Property, by acceptance of delivery of a deed and/or conveyance regardless of form, shall be deemed to have consented to and become expressly bound by these presents, including without limitation, the right of any person entitled to enforce the terms of this Agreement to institute legal action as provided in Paragraph 14 hereof, such remedy to be cumulative and in addition to other remedies provided in this Agreement and to all other remedies at law or in equity. 3. The Stormwater Facilities shall be constructed by and have Maintenance performed by the Parties in accordance with the term and conditions of this agreement and the plans and specifications identified in approved Grading Plan Number LDEV-013935-2021 which is on file as a permanent public record in the City of Encinitas. 4. The cost and expense of the Maintenance of the Stormwater Facilities shall be paid by the Parties. The Parties' share of Stormwater Facilities Maintenance costs is proportional to number of lots/parcels that Owners and Developer own as a fraction of the total number of lots/parcels in the Property using and benefiting from the Stormwater Facilities but excluding common ownership lots/parcels. 5. In the event the Property is subdivided in future, the owners, heirs, assigns, and successors in interest of each such newly created parcel(s) shall be included in the existing HOA and be liable under this Agreement and with the HOA for their then pro rata share of expenses reflecting such newly created parcels. 6. The Maintenance to be performed under this Agreement shall include upkeep, repair, and improvements to adequately ensure the Stormwater Facilities are in proper working order as determined by the City. Upkeep, repair, and improvements under this Agreement shall include, but are not limited to, repairing access roadbeds; repairing, preserving, and providing improvement for the upkeep of drainage structures; removing debris, sediment, oil, grease, and other pollutants as determined by the City; perpetually preserving adequate groundcover and/or other erosion control measures within the Property in order to prevent erosion; and the management of materials, pollutants, and hazardous waste to prevent pollution of the stormwater system or Municipal Separate Stormwater Sewer System (MS4) as referenced in local and State codes. Upkeep, repair, and improvement shall also include other work necessary to repair and preserve the Stormwater Facilities for their intended purposes as well as the restoration of the Stormwater Facilities following any non -permitted modification. The restoration shall be as required to restore the Stormwater Facilities to the condition existing prior to damage or alteration. 7. Developer, Owners, and HOA are collectively responsible to the City for Maintenance of Stormwater Facilities so long as either Developer or Owners own any lots/parcels. Developer remains responsible for Maintenance of Stormwater Facilities until such Facilities have been approved by the City, even if Developer no longer owns any lots/parcels of the Property. 8. Upon establishment of an HOA and a management company to manage the maintenance of the stormwater facilities, the Developer must notify the City of the contact information for the HOA and management company within thirty (30) days. At a minimum, contact information for HOA and management company shall include: organization name, mailing address, email address, phone number, contract person, contact person's phone number, and email address. The above information must be provided to the City prior to occupancy of the first unit (model home occupancy may be exempt from this requirement). If the Developer is the acting HOA manager at the time of occupancy, the Developer's current contact information shall be provided in lieu of the management company information. Any future changes in HOA or management company contact information shall be provided to the City within thirty (30) days of the change being made. Contact information shall be provided in writing to the following address (or current City of Encinitas, Civic Center address): City of Encinitas Stormwater Division 505 S Vulcan Ave Encinitas, CA 92024 9. Any liability of the Parties for personal injury to any worker employed to provide Maintenance under this Agreement, or to third persons, as well as any liability of the Parties for damage to the property of any third persons, as a result of or arising out of Maintenance under this Agreement, shall be borne by the Parties. 10. Parties shall jointly and severally defend, indemnify, and hold harmless City, City's engineer, its consultants, and each of its officials, directors, officers, agents, and employees from and against all liability, claims, damages, losses, expenses, personal injury, and other costs, including costs of defense and attorney's fees, to any contractor, any subcontractor, any user of the Stormwater Facilities, or to any other third persons arising out of or in any way related to the use, Maintenance, or the failure to provide Maintenance of the Stormwater Facilities. This Agreement imposes no liability of any kind whatsoever on the City and the Parties agree to hold the City harmless from any liability in the event the Stormwater Facilities fail to operate properly. 11. Nothing in this Agreement, the specifications, other contract documents, the City's approval of the plans and specifications, or the City's inspection of the work constitutes an acknowledgement of any City responsibility for any such item or the material contained therein, and the City, City's engineer, its consultants, and each of its officials, directors, officers, employees and agents, shall have no responsibility or liability therefore. 12. The Parties shall provide access to the Stormwater Facilities within the Property to the City's inspectors, employees, agents, and contractors within 48 hours of receipt of a written notification by the City. The access shall be provided unconditionally and without any obstruction, interference, or hazard. Any animals kept on the Property shall be secured outside of the area subject to the City's inspection. 13. The Parties hereby grant permission to the City, its authorized agents, and its employees, to enter upon the Property and to inspect the Stormwater Facilities following a 48-hour notice whenever the City deems necessary. The purpose of inspection is to evaluate the condition and performance of the Stormwater Facilities, to follow-up on reported deficiencies, to respond to citizen complaints, and/or to comply with State and City requirements for City inspection of such facilities. The City shall provide the Owner, with copies of the inspection findings and a directive to commence with any repairs deemed necessary. 14. In the event the Parties fail to preserve the Stormwater Facilities in good working condition as determined by the City Engineer, the City, its agents, employees, or its contractors, may enter upon the Property and take the steps deemed necessary to correct deficiencies and shall charge the costs of such repairs to the Parties. In the event the City pursuant to this Agreement, performs work of any nature, or expends any funds for attorney's fees, administrative costs, contractors, employees, consultants, materials, or other costs in the performance of said work, the Owner shall reimburse the City. Such reimbursement shall ba due within thirty <30) days of receipt of a notification for all costs incurred by the City, including any administrative costs and alto rney's fees. If said funds are not paid by the Parties within (30) days, City reserves the right to take legal action for cost recovery and to file with the County Recorder of San Diego County an assessment lien on the Property. It is expressly understood and agreed that the City is under no obligation to perform Maintenance of said Stormwater Facilities, and in no event shall this Agreement be construed to impose any such obligation on the City. 15, The terms of this Agreement may be amended in writing following the Parties request and upon written approval by the City Engineer. '16. This Agreement shall be governed by the laws of the State of California. In the event that any of the provisions of this Agreement are held to be unenforceable or invalid by any court of competent jurisdiction, the validity, and enforceability of the remaining provisions shall not be affected thereby. IN WITNESS HEREOF, the Parties have executed this Agreement. SIYF�A F S LIM 1'T��� OVpN'C'�: � ` PauPaul Barnes Vic�resid��� rcY����i��� rC�I�i� A s5 �S+c✓�'� Secr�� Signature of OWNER must be notarize< CITY OF ENCINITAS: 1 .Bankston ing City Engineer Development Services Department City of Encinitas PA O_TN�FJ�r H 1 P 2 /] ZL Date Attach the appropriate acknowledgement. 3 I i � ZoZz Date A notary public or other officer completing this certificate verifies only the identity of the individual who signed the document to which this certificate is attached, and not the truthfulness, accuracy, or validi of that document. State of California County of San Diego � On February 17, 2022 before me, Patty Rivas, Notary Public (insert name and title of the officer) personally appeared Paul Barnes and Sarah Morrell who proved to me on the basis of satisfactory evidence to be the persons) whose names) is/are subscribed to the within instrument and acknowledged to me that hash¢/they ¢xecut¢d the same in his/her/their authorized capacity(i¢s), and that by his/Fier/their sig natu refs) on the instrument the person(s), or the entity upon behalf of which the persons) acted, executed the instrument. I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct. PATTY RNAS � WITNESS my hand and official seal. s co�.m�mw� No. 23oaea2 �, 5 NOTARY PVBLIO-CALIFORNIA� l'////1 � 9AN OIEOO COVNTY CRnmiubn Etmke6 November 13, 2C29 Signature ($eel) EXHIBIT "A" Legal Description of Property THE LAND REFERRED TO HEREIN BELOW IS SITUATED IN ENCINITAS, IN THE COUNTY OF SAN DIEGO, STATE OF CALIFORNIA, AND IS DESCRIBED AS FOLLOWS: PARCEL A: PARCEL 54 OF CERTIFICATE OF COMPLIANCE RECORDED JANUARY 22, 1999 AS INSTRUMENT NO. 1999-0036120 OF OFFICIAL RECORDS, BEING LOT 54 AND A PORTION OF LOT 58 OF ENCINITAS TRACT NO. 94-066, IN THE CITY OF ENCINITAS, COUNTY OF SAN DIEGO, STATE OF CALIFORNIA, ACCORDING TO MAP THEREOF NO. 13356 FILED IN THE OFFICE OF THE COUNTY RECORDER OF SAID SAN DIEGO COUNTY, SEPTEMBER 4, 1996, DESCRIBED AS FOLLOWS: BEGINNING AT THE NORTHEAST CORNER OF SAID LOT 54; THENCE SOUTH 01' 20' 53" WEST 953.59 FEET ALONG THE EASTERLY LINE OF SAID LOT AND ITS SOUTHERLY PROLONGATION TO THE BOUNDARY OF SAID LOT 58; THENCE ALONG SAID BOUNDARY THE FOLLOWING COURSES: SOUTHERLY 18.41 FEET ALONG A NON -TANGENT CURVE CONCAVE EASTERLY HAVING A RADIUS OF 514.00 FEET, A RADIAL LINE TO THE BEGINNING OF SAID CURVE BEARS, NORTH 650 13' 52" WEST, THROUGH A CENTRAL ANGLE OF 20 03' 07", NON - TANGENT FROM SAID CURVE, NORTH 880 00' 43" WEST 38.31 FEET, SOUTHERLY 154.94 FEET ALONG A NON -TANGENT CURVE CONCAVE EASTERLY HAVING A RADIUS OF 550.00 FEET THROUGH A CENTRAL ANGLE OF 160 08' 27", SOUTH 050 09' 47" WEST 172.10 FEET, AND NORTH 890 02' 31" WEST 647.94 FEET; THENCE ALONG THE BOUNDARY OF SAID LOTS 58 AND 54, THE FOLLOWING COURSES: NORTH 0° 41' 23" EAST 684.36 FEET, NORTH 0° 39' 48" EAST 96.14 FEET, NORTH 00 41' 13" EAST 508.34 FEET AND SOUTH 890 18,501, EAST 751.43 FEET TO THE POINT OF BEGINNING. EXCEPTING THEREFROM THAT PORTION OF SAID LAND DEEDED TO THE CITY OF ENCINITAS BY QUITCLAIM RECORDED DECEMBER 17, 2002, AS FILE NO. 2002-1153619 OFFICIAL RECORDS. PARCEL B: AN EASEMENT FOR INGRESS AND EGRESS, FENCING, PARKING, UTILITIES, LANDSCAPING, DRAINAGE AND ANY OTHER USE PERMITTED UNDER THE APPLICABLE ZONING CODES, 10.00 FEET WIDE, OVER THAT PORTION OF PARCEL 58 OF LOT LINE ADJUSTMENT NO. 98-181 BA IN THE CITY OF ENCINITAS, COUNTY OF SAN DIEGO, STATE OF CALIFORNIA, RECORDED JANUARY 22, 1999 AS FILE NO. 1999-0036120 OF OFFICIAL RECORDS OF SAID COUNTY, THE WESTERLY LINE OF WHICH IS DESCRIBED AS FOLLOWS: BEGINNING AT THE NORTHWEST CORNER OF SAID PARCEL; THENCE SOUTH 10 20' 53" WEST 953.59 FEET ALONG THE WESTERLY LINE OF SAID PARCEL TO THE SOUTHERLY CORNER THEREOF. EXCEPT THAT PORTION INCLUDED WITHIN QUAIL GARDENS DRIVE. APN: 254-612-12-00 EXHIBIT "B" Description and Plat of Stormwater Facilities STORMWATER MAINTENANCE AGREEMENT EXHIBHIT F0Y4a0dJT-F:ill l-S- BIOFILTRATION BASIN (BF-1) BMPA-3 AREA: 4,411 SF MAP 7832 BIOFILTRATION BASIN (BF-1)- BMPA-2 AREA: 4,248 SF PERVIOUS PAVERS (INF-3) MAP 7832 EXHIBIT 8-3 STORMWATER MAINTENANCE AGREEMENT EXHIBHIT FOX POINT FARMS LOT3 - - - - - - - - - - - - - - BIOFILTRATION BASIN (BF-1) - - BMPA- AREA: 226 SF PARCEL 58 OF LLA NO. 98-181 LOT A 0 NX LOT2 PRIVATE . DRIVEWAY C 00 OTI 0 50, 100, SCALE.- 1"=50' EXHIBIT B-5 STORMWATER MAINTENANCEAGREEMENT EXHIBHIT FOX POINT FARMS PRIVATE DRIVEWAY r BIOFILTRATION BASIN (BF-1) LOT 1 BMP B-2 AREA: 396 SF -C� BIOFILTRATION BASIN (BF-1) G— BMP B-1 v AREA: 335 SF �� o I LEUCADIA BOULEVARD I 00 EXHIBIT 8-6 STORMWATER MAINTENANCE AGREEMENT EXHIBHIT FOX POINT FARMS w n rrn ni i rn INSIDE OF STORM DRAIN STRUCTURE IN JB-DRAIN OUTLET. ATTACH WITH TAMPER -S AT EACH CORNER, TYP. 6"X6"SQUARE, MIN., a INCH THICKSTEEL PLATE. HOTDIP GALVANIZE AFTER FABRICATION AND DRILLING. PLACE NEOPRENE RING BETWEEN THE PLATE AND STRUCTURE WALL PRIOR TO ATTACHMENT FOR A WATERTIGHT CONNECTION PERFORATED PVC SUB -DRAIN . ORIFICE PER TABLE BELOW & APPROVED STORM WATER QUALITY MANAGEMENT PLAN (SWQMP) DRILLED ORIFICE PLATE DETAIL NOT TO SCALE BMP # PONDING DEPTH (FT) MEDIA DEPTH (FT) STORAGE DEPTH (FT) HMP ORIFICE (IN) A BOT (FT 2) A TOP (FT 2) Al 1.5 1.5 3.0 4.0 1,685 1,685 A2 1.2 1.5 3.0 4.0 4,248 4,248 A3 1.2 1.5 3.0 4,0 4,411 4,411 A4 1.3 1.5 3,0 4.0 1,848 1,848 A5 1,0 1.5 3.0 0.5 226 226 81 0.5 1.5 1,0 4.0 335 335 B2 0.5 1.5 1.0 4,0 396 396 VAULT NIA NIA 14.5 2.8 5,329 5,329 BMP SIZE & ORIFICE DIAMETER SUMMARY EXHIBIT B-7 STORMWATER MAINTENANCE AGREEMENT EXHIBHIT FOX POINT FARMS DEEP ROOTED, DENSE, DROUGHT TOLERANT PLANTING SUITABLE FOR WELL DRAINED SOIL TOP OF BASIN PER PLAN-------- - o = ------- — ------------------------------------------ 6"FREEBOARD = 6"-18" PONDING �z a w 2:1 co a Q 0.25' OVERFLOW STRUCTURE 36" BROOKS BOX PER PLAN Q 3" MULCH 18" BIOFILTRATION MEDIA IMPERMEABLE LINER 0.25' 3" OF 3/8"GRAVEL w o w c} 314" CLEAN CRUSHED ROCK 0 0 0 cx� 03 o a�oa TREATED RUNOFF ROUTED TO STORAGE 4° PERFPVC UNDERDRAIN� "° SIZEIMATERIAL PER PLAN IE= 0.V ABOVE LINER UNDERDRAIN ORIFICE PLATE NATIVE FILL CONNECTION TO SEE DETAIL, PCC CUTOFF WALL THIS SHEET SEE DETAIL, THIS SHEET OVERFLOW TYPICAL BASIN DETAIL NOT TO SCALE BMP ID SURFACE AREA PONDING DEPTH STORAGE DEPTH Al 1,685 SF 18" 36, A2 4,248 SF 14.4" 36" A3 4,411 SF 14.4" 36, A4 1,848 SF 15.6" 36" A5 226 SF 12" 36" B1 335 SF 6" 12" B2 396 SF 6" 12" BMP BASIN DATA TABLE EXHIBIT B-8 ST®RMWATER MAINTENANCE A GREEMENTEXHIBHIT FOX POINT FARMS ALLOWABLE MAX GRADE = 318.00 ALLOWABLE MIN GRADE = 313.08 SEE BACKFILL SPECIFICATIONS INCLUDED IN THE STORM WATER QUALITY MANAGEMENT PLAN TOS= 312.00 HM= 311.00 SYSTEM INVERT= 296.50 �- ORIFICE PLATE PER DETAIL, SHEET2 OUTLET CONTROL WEIR OUTLET PIPE PER PLAN 6" STONE BASE 3000 PSF (MIN) BEARING CAPACITY TO BE VERIFIED IN FIELD BY OTHERS TYPICAL SECTION - STORMTRAP STORM WATER VAULT NOT TO SCALE CITY APPROVED PAVER (3" THICK MI N. J 6„ FILL PAVER OPENINGS WITH 3/8"GRAVEL PROPOSED PCC FL USH CURB 2° - CLEAN WASHED COARSE SAND FOR LEVELING "---SOIL SUBGRADE NOTES: -ALL AGGREGATE MUST BE CLEANIWASHED AND FREE OF FINES (SAND, SILT, ETC.) -THE PAVERS SHALL NOT BE SEALED ONCE THE VOID FILLER HAS BEEN ADDED -EACH COURSE SHALL BE VIBRATORY COMPACTED BEFORE PLACEMENT OF NEXT COURSE -NO IMPERVIOUS LINER OR FILTER FABRIC TO BE USED -SPECIAL APPROVAL REQUIRED FOR USE IN HIGHLY EXPANSIVE SOIL - SUBDRAIN MAYBE REQUIRED PERVIOUS PAVER DETAIL NOT TO SCALE EXHIBIT B-9 EXHIBIT `C' Minimum Maintenance Requirements and Maintenance Procedure for Stormwater Facilities STORMTRAP MAINTENANCE MANUAL 1_ Introduction Regular Inspections are recommended to ensure that the system Is functioning as designed. Piea se call your Authorized StormTrap Representative if you have ques[lons In regards to the inspection and maintenance of the StormTrap system. Prior to entry Into any underground storm sewer or underground detention systems, appropriate OSHA and local safety regulations and guidelines should be followed. 2. Inspection Schedules for Municipalities StormTrap Storm water Management Systems are recommended for Inspection whenever the upstream and downstream catch basins and stormwater pipes of the stormwater collection system are Inspected or maintained. This will economize the cost of the inspection If It Is done a[ the same time the Municipal crews are visiting the area. 3. Inspection Schedules for Private development StormTrap Stormwater Man Bement Systems, fora private development, are recommended For Inspection after each major storm water event. At a minimum, until a Ilea Wing schedule can be established, an annual inspection Is recommended. If Inspected on an annual bast s, the Inspection shout❑ be conducted before the stormwater season begins to be sure that everything is functioning properly for the upcoming storm season. 4. Inspection Process Inspections should be done such that at least 2-3 days has lapsed since the most recent rain event to allow for draining. Visually Inspect the system at all manhole locations. Utilizing a sediment pole, measure and document the amount of silt at each manhole location (Figure 1). Inspect each pipe opening to ensure that the silt level or any foreign objects are not blocking the pipes. Be sure to Inspect the outlet pipes) because this Is typically the smallest ..e. �. ynia .... ...,�,,, �. ...<,�,� Hv.. ,.i>.,�i.....,. StarmTrap- pipe in the system. It Is common that most of the larger materials will be collectetl upstream of the system in catch basins, and It is therefore important at time of inspections to check these structures for large trash or blockages. Remove any blockages if you can during the inspection process only if you can do so safely from the top of the system without entering Into the system. Do not go into the system under any circu ma[a nces without proper ventllatton equlpm ent and tral Wing. Pass any Information requiring action onto the appropriate maintenance personnel IF you cannot remove the blockages from above during the Inspection process. Be sure to describe The location of each manhole and the type of material That needs to be removed. The sediment level of the system shoultl also be measured and recorded during the inspection process. Recording the sediment level at each manhole Is very Important in ortler ge[ a history of sediment that can be graphed over time (i.e. years) In order to estimate when the system will need to be maintained next. It is also Important to keep these records to verify that the Inspection process was actually perform etl If anyone asks for your records in the future. The sediment level in the underground detention system can be determined From the outsitle of the system by opening up all the manholes and using a sediment pole to measure the amount of sediment at each location. Force the stick to the bottom of the system and then remove It and measure the amount of sediment at that location. Again, do not go into the system under any circumstances without proper ventilation equipment and training. 5. When to Clean the System Any blockages should be safely removed as soon as practical so that the Stormwater detention system will FII and drain properly before the next stormwater event. The Dry Detention System shoultl be completely cleaned whenever the sediment occupies more than 10 % to 15% of the originally designed system's volume. The Wet Detention System should be cleaned when the sediment occupies more than 30% or 1/3rd of the originally designed system's volume. NOTE: Check with your municipality in regartls to Ste�e-Ira�tTrap- cleaning criteria, as the allowable sediment before cleaning may be more or less then described above. 6. How to Clean the StormTrap The system shoultl be completely cleaned back to 100 % of the originally deslg ned storage volume whenever the above sediment levels have been reached. Be sure to watt at least 3 days aRer a stormwater event to be sure that the system Is completely drained (if it is a Dry Detention System), and all oP the sediments have settled to the bottom of the system (if It is a Wet Detention System). Do not enter the System unless you are properly trained, equipped, and qualified to enter a confined space as IdentiRed by local occupational safety and health regulations. There are many maintenance companies that are In business to help you clean your underground stormwater detention systems and water quality units. Please call your StormTrep representative for referrals in your area. A. Dry Detention System Cleaning Maintenance Is typically pertormed using a vacuum truck. Sediment should be flushed towards a vacuum hose for thorough removal. Fora Dry Detention System, remove the manhole cover at the top of the system and Tower a vacuum hose Into on¢ of the rows of the StormTrap system. Open up the manhole at the opposite end of the StormTrap and use sewer jetting equipment to force water In the same row from one end of the StormTrap row to the opposit¢ side. The rows of the StormTrap are completely open in one contiguous channel from one end to the other for easy cleaning. Place the vacuum hose and the sewer jetting equipment In the next row and repeat the process until all of the rows have been cleaned. When flnlshed, replace all covers that were removed and dispose of the collected m aterl al properly. ... _s _v xie ssa, ...�. �„w,..,.,.�„����„o�„ R... c.,..�u.n.ue„�,�r-.oaa, -,...I�i.T3i�Sif:,: If the system was deslg ned to maintain a permanent pool of water, Floatables and any oil should be removed in a separate procedure prior to the removal of all sediment. The Floatable trash is removed first by using a bucket strainer to capture and remove any floating debris. The floatable oils are then removed off the top of the water by using the vacuum truck to suck off any floats ble fluids and liquids. The next step Is to use the vacuum truck to gently remove the c1arlFled water above the sediment layer. The final step is to clean the sediment for each row as described above in the paragraph "A. Dry Detention System Cleaning". For smaller systems, the vacuum truck can remove all of the sediment In the basin without using the sewer jetting equipment because of the smaller space. 7. Inspection Reports Proof of these Inspections Is the responsibility of the property owner. All Inspection reports and data should be kept on site or at a location where they will be accessible for years in the future. Some municipalities require these Inspection and cleaning reports to be forwarded to the proper governmental permitting agency on an annual basis. Refer to your local antl national regulations for any additional maintenance requirements and schedules not contalnetl herein. Inspections should be a part of your standartl operating procedure. ... say ne ssn> o�. �i.,�, ..sm��n �r poi., ao,.,�a..ni... n„�.��. r�nnue n �N;o Sr4�NENT StormTrap- Flgura 1. During Inspection, measure the tlistance from flnlshetl grade to the top of the sediment insitle the system. F-Fr..ra r�rc�r_T.79rrtT.r. �"..F-7f li�t�J m Oate Dap[h of accum ula[ad Me n[¢nanc¢ M¢fn[¢nanc¢ Comman[a Sedimen[ Traah P¢d'orm¢tl � P¢raonnei ...nv. HI•t qql quay v1.. v:.:, a na�.�r.. ..n.. _ a: n.. iL �l'm F.:..i, BMP MAINTENANCE FACT SHEET FOR STRUCTURAL BMP INF-3 PERMEABLE PAVEMENT AS STRUCTURAL BMP Permeable pavement is pavement that allows for percolation through void spaces in the pavement surface into subsurface layers. The subsurface layers are designed to provide storage of storm water runoff so that outflows, primarily via infiltration into subgrade soils or release to the downstream conveyance system, can be at controlled rates. Permeable pavement as structural BMP usually receives runoff from a larger tributary area than permeable pavement as site design BMP (see SD-613 for permeable pavement as site design BMP). Pollutant control is provided via infiltration (retention). Flow control is provided by infiltration and/or an outlet control structure. Typical permeable pavement components include: ® Permeable surface layer ® Bedding layer for permeable surface ® Aggregate storage layer with optional underdrain(s) m Optional final filter course layer over uncompacted existing subgrade ® Uncompacted native soils at the bottom of the facility ® Optional subsurface check dams at regular intervals when pavement is sloped (more closely spaced on steeper slopes) ® Optional outflow control structure for runoff released via underdrain(s) Normal Expected Maintenance Routine maintenance of permeable pavement includes: removal of materials such as trash and debris accumulated on the paving surface; vacuuming of the paving surface to prevent clogging; and flushing paving and subsurface gravel to remove fine sediment. If the BMP includes underdrains and/or an outflow control structure, check and clear these features. A summary table of standard inspection and maintenance indicators is provided within this Fact Sheet. Non -Standard Maintenance or BMP Failure If the permeable pavement area is not drained between storm events, or if runoff sheet flows across the permeable pavement area and flows off the permeable pavement area during storm events, the BMP is not performing as intended to protect downstream waterways from pollution and/or erosion. During storm events up to the 85th percentile storm event (approximately 0.5 to 1 inch of rainfall in San Diego County), runoff should not flow off the permeable pavement area. The permeable pavement area is expected to have adequate hydraulic conductivity and storage such that rainfall landing on the permeable pavement and runoff from the surrounding drainage area will go directly into the pavement without ponding or overflow (in properly designed systems, the surrounding drainage area is not more than half as large as the permeable pavement area). Following the storm event, there should be no standing water (puddles) on the permeable pavement area. If storm water is flowing off the permeable pavement during a storm event, or if there is standing water on the permeable pavement surface following a storm event, this is an indicator of clogging somewhere within the system. Poor drainage can result from clogging of the permeable surface layer, any of the subsurface components, or the subgrade soils. The specific cause of the drainage issue must be determined and corrected. Surface or subsurface ponding longer than approximately 96 hours following a storm event poses a risk of vector (mosquito) breeding. Corrective maintenance, increased inspection and maintenance, BMP replacement, or a different BMP type will be required. If poor drainage persists after flushing of the paving, subsurface gravel, and/or underdrain(s) when applicable, or if it is determined that the underlying soils do not have the infiltration capacity expected, the [City Engineer] shall be contacted prior to any additional repairs or reconstruction. INF-3 Page 1 of 8 January 12, 2017 r Other Special Considerations The runoff storage and infiltration surface area in this BMP are not readily accessible because they are subsurface. This means that clogging and poor drainage are not easily corrected. If the tributary area draining to the BMP includes unpaved areas, the sediment load from the tributary drainage area can be too high, reducing BMP function or clogging the BMP. All unpaved areas within the tributary drainage area should be stabilized with vegetation. Other pretreatment components to prevent transport of sediment to the paving surface, such as grass buffer strips, will extend the life of the subsurface components and infiltration surface. Along with proper stabilization measures and pretreatment within the tributary area, routine maintenance, including preventive vacuum/regenerative air street sweeping, is key to preventing clogging. 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Z \ \ j ( » 2 I. \/ § \ § a \ //$ } \ \ O O 0 BMP MAINTENANCE FACT SHEET FOR STRUCTURAL BMP BF-1 BIOFILTRATION Biofiltration facilities are vegetated surface water systems that filter water through vegetation, and soil or engineered media prior to discharge via underdrain or overflow to the downstream conveyance system. Biofiltration facilities have limited or no infiltration. They are typically designed to provide enough hydraulic head to move flows through the underdrain connection to the storm drain system. Typical biofiltration components include: ® Inflow distribution mechanisms (e.g., perimeter flow spreader or filter strips) ® Energy dissipation mechanism for concentrated inflows (e.g., splash blocks or riprap) ® Shallow surface ponding for captured flows ® Side slope and basin bottom vegetation selected based on climate and ponding depth ® Non -floating mulch layer ® Media layer (planting mix or engineered media) capable of supporting vegetation growth ® Filter course layer consisting of aggregate to prevent the migration of fines into uncompacted native soils or the aggregate storage layer ® Aggregate storage layer with underdrain(s) ® Impermeable liner or uncompacted native soils at the bottom of the facility ® Overflow structure Normal Expected Maintenance Biofiltration requires routine maintenance to: remove accumulated materials such as sediment, trash or debris; maintain vegetation health; maintain infiltration capacity of the media layer; replenish mulch; and maintain integrity of side slopes, inlets, energy dissipators, and outlets. A summary table of standard inspection and maintenance indicators is provided within this Fact Sheet. Non -Standard Maintenance or BMP Failure If any of the following scenarios are observed, the BMP is not performing as intended to protect downstream waterways from pollution and/or erosion. Corrective maintenance, increased inspection and maintenance, BMP replacement, or a different BMP type will be required. The BMP is not drained between storm events. Surface ponding longer than approximately 24 hours following a storm event may be detrimental to vegetation health, and surface ponding longer than approximately 96 hours following a storm event poses a risk of vector (mosquito) breeding. Poor drainage can result from clogging of the media layer, filter course, aggregate storage layer, underdrain, or outlet structure. The specific cause of the drainage issue must be determined and corrected. Sediment, trash, or debris accumulation greater than 25% of the surface ponding volume within one month. This means the load from the tributary drainage area is too high, reducing BMP function or clogging the BMP. This would require pretreatment measures within the tributary area draining to the BMP to intercept the materials. Pretreatment components, especially for sediment, will extend the life of components that are more expensive to replace such as media, filter course, and aggregate layers. Erosion due to concentrated storm water runoff flow that is not readily corrected by adding erosion control blankets, adding stone at flow entry points, or minor re -grading to restore proper drainage according to the original plan. If the issue is not corrected by restoring the BMP to the original plan and grade, the [City Engineer] shall be contacted prior to any additional repairs or reconstruction. BF-1 Page 1 of 11 January 12, 2017 Other Special Considerations Biofiltration is a vegetated structural BMP. Vegetated structural BMPs that are constructed in the vicinity of, or connected to, an existing jurisdictional water or wetland could inadvertently result in creation of expanded waters or wetlands. As such, vegetated structural BMPs have the potential to come under the jurisdiction of the United States Army Corps of Engineers, SDRWQCB, California Department of Fish and Wildlife, or the United States Fish and Wildlife Service. This could result in the need for specific resource agency permits and costly mitigation to perform maintenance of the structural BMP. Along with proper placement of a structural BMP, routine maintenance is key to preventing this scenario. 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