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2023-52146Recording Requested By: City Engineer DOG# 2023-0052146 lillll lilll IIIII hill Illi IIIIII IIIII IIIII lllll Illll iilllllll! IIII IIII Mar 01, 2023 09:20 AM OFFICIAL. RECORDS JORDAN Z. MARKS, SAN DIEGO COUNTY RECORDER FEES: $0,00 (SB2 Atkins: S0.00) When Recorded Mail to: PAGES 31 City Clerk City of Encinitas 505 South Vulcan Avenue Encinitas, CA 92024 SPACE ABOVE FOR RECORDER'S USE AGREEMENT FOR MAINTENANCE OF PRIVATE STORMWATER TREATMENT AND STORMWATER POLLUTION CONTROL FACILITIES BY PROPERTY OWNER A. P.N.: 258-280-04 Address: 800 Santa Fe Drive Grading Plan: LDEV-019346-2022 Case No: SUBC-004473-2021 THIS AGREEMENT is between the City of Encinitas, a municipal corporation, hereinafter referred to as the "City", and San Diequito Union High School District, its heirs, successors, and assigns, collectively hereinafter referred to as "Owner", 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 and pollution control 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, 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. WHEREAS, this Agreement is required by the City as a 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 benefit said Property and are used by OWNER; and WHEREAS, the Property benefits and uses the Stormwater Facilities, which are described in Exhibit "B"; and WHEREAS, it is the desire of the City and the responsibility of the Owner 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 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 the intention of the Owner and the City 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 Owner's 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). i) The Owner shall inspect the Stormwater Facilities after all major storms. In addition, the Owner shall inspect the Stormwater Facilities at the minimum frequency specified in Exhibit "C", but not less than twice per year. ii) The Owner shall provide upkeep and repair to preserve the Stormwater Facilities in good working order and shall repair all deficiencies identified in the Owner's 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 during any storm event until such time as the Facilities are restored to good working order. 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 Owner shall ensure that the Stormwater Facilities are in proper working order for the rainy season, which starts on October 1. iii) The Owner 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 Owner 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 13 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 Owner in accordance with the terms and conditions of this agreement and the plans and specifications identified in approved Grading Plan Number LDEV- 019346-2022 which is on file as a permanent public record in the City of Encinitas. 4) The cost and expense of Maintenance of the Stormwater Facilities shall be paid by the Owner. 5) In the event the Property is subdivided in the future, the owners, heirs, assigns, and successors in interest of each such newly created parcel(s) shall be liable under this Agreement 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) Any liability of the Owner for personal injury to any worker employed to provide Maintenance under this Agreement, or to third persons, as well as any liability of the Owner 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 Owner. 8) Owner shall jointly and severally defend, indemnify, and hold harmless the 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 for the Stormwater Facilities. This Agreement imposes no liability of any kind whatsoever on the City and the Owner agrees to hold the City harmless from any liability in the event the Stormwater Facilities fail to operate properly. 9) 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. 10)The Owner shall provide access to the Stormwater Facilities within the Property to 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. 11)The Owner hereby grants 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. 12) In the event the Owner fails to maintain 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 Owner. 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 in full. Such reimbursement shall be due within thirty (30) days of receipt of a notification for all costs incurred by the City, including any administrative costs and attorney's fees. If said funds are not paid by Owner 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 maintain or repair said Stormwater Facilities, and in no event shall this Agreement be construed to impose any such obligation on the City. 13)The terms of this Agreement may be amended in writing following Owner's request and upon written approval by the City Engineer. 14)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. SAN DIEGUITO UNION HIGH SCHOOL DISTRICT: Of GAL I ! 8 So2 2. a Do as, Interim Vperintendent Dat Signature of OWNER must be notarized. Attach the appropriate acknowledgement. CITY OF ENCINITAS: Z /Z] PI T. Bankston Date -City Engineer City of Encinitas Notarization of CITY OF ENCINITAS signature required CALIFORNIA ACKNOWLEDGMENT CIVIL CODE § 111825 3 S - ..5. .'.; . .I ): ar.L• a€•i`• �'�::.:.cri .':v.. -R. 3 .. 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 validity of that document. State of California County of fah T->ifA S I On Fe6ryj" 21, Z® 2 "-� before me, 13 L—ew S,L��Pti.bt tG Date Here Insert Name and Title of the Officer personally appeared �� `, T. Pisa Name(s) of Signer(s) who proved to me on the basis of satisfactory evidence to be the person(s) whose name(s) is/are subscribed to the within instrument and acknowledged to me that he/she/they executed the same in his/her/their authorized capacity(ies), and that by his/her/their signature(s) on the instrument the person(s), or the entity upon behalf of which the person(s) acted, executed the instrument. Public - California �)41)BRUL411my Notary c_MW County Commision p 2402633 Comm. Expires May 14, 2026 r Place Notary Seal and/or Stamp Above I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct. WITNESS my hand and official seal. Signature —( "c- - (A LQ Q a.% Signature of Notary Public —1 ..V.— Completing this information con deter alteration of the document or fraudulent reattachment of this form to an unintended document. Description of Attached Document Title or Type of Document: A"ou#%+ -6- Sibrrnw-Aer VA41o"ne, Nf25%-Z$D•0' Document Date: Signer(s) Other Than Named Above: Capacity(ies) Claimed by Signer(s) Signer's Name: ❑ Corporate Officer — Title(s): ❑ Partner — ❑ Limited ❑ General ❑ Individual ❑ Attorney in Fact ❑ Trustee ❑ Guardian or Conservator ❑ Other: Signer is Representing: C� oC— n eA Y►i+ S- ©2019 National Notary Association Number of Pages: Signer's Name: ❑ Corporate Officer — Title(s): ❑ Partner — ❑ Limited ❑ General ❑ Individual ❑ Attorney in Fact ❑ Trustee ❑ Guardian or Conservator ❑ Other: Signer is Representing: CALIFORNIA ALL-PURPOSE ACKNOVILEDGMENT CIVIL CODE § 1189 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 validity of that document. State of California 1 County of ,5,w )} On Affjq %tom I U / 12002')'-, before me. Date / Here Insert Name and itle of the O+ cer personally appeared �� eel (/(,�j- Nomeldof Signer who proved to me on the basis of satisfactory evidence to be the person(�y whose name is/.ara-subscribed to the within instrument and acknowledged to me that executed the same inJa+s/her/#te�ir-� authorized capacitysj.4 and that by h+ her/tkaeir signature($'f on the instrument the person a(, or the entity upon behalf of which the person(�acted, executed the instrument. igiitAY C. MAMA LINDL Notary Public -California San Diego County Commission # 2399352 Comm. Expires Apr 29, 2026 Place Notary Seal and/or Stamp Above I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct. WITNESS my hand and official seal. Signature l /l 1i SignatuT56 otary Public OPTIONAL Completing this information can deter alteration of the document or fraudulent reattachment of this form to an unintended document. Description of Attached Dof ument //N Title or Type of Document: e UYT�� �,��(�Qr� Document Date: i _ /Y/Numbe ofpages: Signer Other Than Named Above: fU h Kvn l lti'fLf'�}1/�q' Capacity(ies) CI"pd by S' ner(s) v �11-61 Signer's Name: I t r' S�i�gl�er's Name: Corporate Officer — Title(s): +ti�f9'Corporate Officer — Title(s): ❑ Partner — ❑ Limited ❑ General ❑ Partner — ❑ Limited ❑ eral ❑ Individual ❑Attorney in Fact ❑ Individual Attorney in Fact ❑ Trustee ❑ Guardian of Conservator ❑ Trustee ❑ Guardian of Conservator ❑ Other: ❑ Other: Signer is Representing A -A U t Signer is Rep senting: Z,2017 National Notary Association EXHIBIT "A" LEGAL DESCRIPTION APN: 258-280-04 THE SOUTHEAST QUARTER OF THE SOUTHEAST QUARTER OF SECTION 15, TOWNSHIP 13 SOUTH, RANGE 4 WEST, SAN BERNARDINO MERIDIAN, IN THE CITY OF ENCINITAS, COUNTY OF SAN DIEGO, STATE OF CALIFORNIA GROSS/NET AREA: 36.19 AC F u s c O E E N G I N E E R I N G 6390 Greenwich Dr., Suite 170, San Diego, California 92122 tel 858.554.1500 o fax 858.597.0335 o www.fuscoe.com PARKING LOT AND SPORT COURT BMP 1 RESTORATION PER DRAWING G- �,,,,, = FUSCOE E N G I N E E R I N G 6390 Greenwich Dr., Suite 170, San Diego, California 92122 tel 858.554.1500 0 fax 858.597.0335 o www.fuscoe.com a In No SHEET 1 KEY MAP SCALE: 1 "=80' �1 1 LEGEND 1O BIOFILTRATION BASIN FOR COMBINED POLLUTANT AND HYDROMODIFICATION CONTROL OADS HP STORM DETENTION PIPE FOR HYDROMODIFICATTON CONTROL 3O PERMEABLE PAVERS 4O EXISTING PERMEABLE PAVERS (SHOWN FOR REFERENCE ONLY) CATCH BASIN 2 (OVERFLOW) TYPE G-1 STORM DRAIN PER RSD D-08. MODIFY WITH FLOW CONTROL ORIFICE PLATE ON INCOMING PIPE FROM CATCH BASIN 1(SEE PLAN FOR CATCH BASIN CONFIGURATION 18" MEDIA WITH 51N/HR FILTRATION RATE TW PER PLAN PCC HARDSCAPE z d SLOPE 2 q " (3:1 MAX) -\ i — - i 3" WASHED SAND PER ASTM C33 — — — 3" WASHED NO. 8 STONE 57 STONE / PLANTER WALL PER PLATE WITH J STRUCTURAL DRILLED ORIFICE PER SHEET 3 CATCH BASIN 1 PRECAST CATCH BASIN (24"X24") (HMP CONTROLLED) 18' �' 3" MULCH I ]d I 21 71,, 6" DIA PERFORATED SUBDRAIN FOR LENGTH OF BASIN. IE 3" ABOVE BASIN BOTTOM SHEET 2 FENCE PER ARCHITECT SPORTCOURT SURFACE 30 MIL THICK PVC OR APPROVED EQUAL IMPERMEABLE LINER PLANTER BOX PER STRUCTURAL 8" PVC STORM DRAIN TO STORMTECH CHAMBERS STORMTECHI CHAMBERS SC-310. SECTION - BIOFILTRATION DETAIL NTS PVC LINER PENETRATION NOTE: ALL PIPE PENETRATION THROUGH THE PVC LINER ON THE SIDE OF A BIOFILTRATION BASIN SHALL HAVE A COE WELDED PVC BOOT, CONCRETE CUTOFF WALL, AND/OR ANOTHER APPROVED E N G I N E E R I N G METHOD TO PREVENT WATER MIGRATION 6390 Greenwich Dr., Suite 170, San Diego, California 92122 FROM PVC LINED BIOFILTRATION AREAS. tel 858.554.1500 o fox 858.597.0335 o www.fuscoe.com SHEET 3 ORIFICE PLATE: MIN. SQUARE DIMENSIONS V GREATER THAN PIPE DIA. HOT DIP GALVANIZED PLATE AFTER HOLES HAVE BEEN DRILLED 1/2" MAX 3/8" DIA. HOLE (TYP.) NOTE: 1. ORIFICE & FLANGE CONNECTION TO CONCRETE SHALL BE FILLED WITH 30 DUROMETER NEOPRENE RING MIN. 6" (TYP.) - 3" (TYP.) 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O� r N W z w 8 O N dy � �m E ip0 2 9 1/ V I °I wZ 4 E 3F 8 zx so 'W W a W d a N W W EEQ O U Z O 0 4 8 N O � w m O W � mW Y N Z U O U - N W U N m z W Z � ,, a W 0WZ FK W Z � N ° � a � Z > W N d w w LL r ° N y K U w W O Q W Q r 0 h U OZ ^ 2 S Z J zyg�N z U N Z < _ O 4 Zo o U F d ¢ tt 4i o � ¢ N O N U WO wW m Z rc O ¢ W Z W m U O 0 U O y O y 0 W W K S NW W a K = a r Z O w ¢ O aE3 w w w O N O O O m y USCOE ADS STORMTECH CHAMBER SYSTEM DETAIL 1111" E N G I N E E R I N G NOT TO SCALE 6390 Greenwich Dr., Suite 170, San Diego, California 92122 EXHIBIT "tJ((�� " S H E ET 4 tel 858.554.1500 o fax 858.597.0335 a www.fuscoe.com EXHIBIT "C" POST -CONSTRUCTION PERMANENT BMP OPERATION & MAINTENANCE PROCEDURE DETAILS STORM WATER MANAGEMENT AND DISCHARGE CONTROL MAINTENANCE AGREEMENT O&M RESPONSIBLE PARTY DESIGNEE: SDUHSD INSPECTION MAINTENANCE MAINTENANCE QUANTITY BMP DESCRIPTION FREQUENCY FREQUENCY METHOD TREATMENT CONTROL BF-1 BIOFILTRATION BEFORE AND AFTER AS DETERMINED BY REMOVE TRASH AND 1 EA BASIN (BMP 2) LARGE STORM EVENTS INSPECTION OF ANY DEBRIS. VEGETATION OR ON A WEEKLY BLOCKAGE OF INLETS/ SHOULD BE TRIMMED BASIS DURING PERIODS OUTLETS, STRUCTURAL TO MAX. 18 INCHES OF WET WEATHER. DAMAGE AND EROSION IN HEIGHT. DAMAGE. PERMEABLE PAVERS (SD-3) BI-MONTHLY BI-MONTHLY VACUUM SURFACE 1 EA AND REPLACE FILTER LAYERS AS REQUIRED HYDROMODIFICATION CONTROL FLOW CONTROL STRUCTURE BEFORE AND AFTER AS DETERMINED BY INSPECTION OF ANY 1 EA FOR HMP TANK 1 LARGE STORM EVENTS BLOCKAGE OF INLETS/ OR ON A WEEKLY OUTLETS, STRUCTURAL DAMAGE AND EROSION BASIS DURING PERIODS DAMAGE. OF WET WEATHER. F U S CO E E N G I N E E R I N G 6390 Greenwich dr., Suite 170, San Diego, California 92122 tel 858.554,1500 o fax 858.597.0335 o www.fuscoe.com I BMP MAINTENANCE FACT SHEET O; 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 panding depth ® Non -floating mulch layer Media layer (planting mix or engineered media) capable of supporting vegetation growth g 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 95 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 ate 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 rna nteriancg is key to reve ruing phis scenarlQ. BF-1 Page 2 of 11 January 12, 2017 v co I �vai U A. Qp c co +L o$ c i .N a t; v A a= �i 7 C. ( 3 aa)i ® i y. I `+- 7.0 to c N O 6 C a a vim° C ! LA w°- + I ? 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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-6B 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) • 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 85'h 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 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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