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Storm Water Facilities Maintenance Agreement 2023-01911297/20/23, 10:57 AM Batch 16025544 Confirmation RECORDING REQUESTED BY: CITY OF POWAY AND WHEN RECORDED MAIL TO: CITY CLERK CITY OF POWAY P O BOX 789 POWAY. CA 92074 APN: 317-280-57 DOC# 2023-0191129 Illlllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll Jul 20, 2023 10:34 AM OFFICIAL RECORDS JORDAN Z. MARKS, SAN DIEGO COUNTY RECORDER FEES: $0.00 (SB2 Atkins: $0.00) PAGES: 20 (THIS SPACE FOR RECORDER'S USE) STORM WATER FACILITIES MAINTENANCE AGREEMENT Mobile Mini — 12345 Crosthwaite Circle (G19-0012) The undersigned grantor(s) declares: Documentary Transfer Tax is $ -0- pursuant to R & T Code 11922 (conveyance to a Government Agency) This AGREEMENT for the maintenance and repair of certain Storm Water Facilities is entered into between the Property Owner(s) Crosthwaite Circle, LLC, a California limited liability company, (hereinafter referred to collectively as "OWNER") and the City of Poway (hereinafter referred to as "CITY") for the benefit of the CITY, the OWNER, the successors in interest to the CITY or the OWNER, and the public generally. WHEREAS, OWNER is the owner of certain real property located in the City of Poway, California, more particularly described in Exhibit "A", hereto (hereinafter referred to as the "PROPERTY"), which is replacing asphalt pavement with concrete in accordance with applications for Grading Permit Number G19-0012 , which are on file with the CITY. This Agreement is required as a condition of approval for such development. WHEREAS, in accordance with the California Regional Water Quality Control Board San Diego Region Order Number R9-2017-0077, (hereinafter referred to collectively as "Trash Amendment"), the City of Poway's Stormwater Management and Discharge Control Ordinance, Poway Municipal Code, Chapter 13 and 16 (the "Stormwater Ordinance"), the City of Poway Subdivision Ordinance, the City of Poway Zoning Ordinance, the City of Poway Grading Ordinance and/or other ordinances or regulations of CITY which regulate land development and urban runoff, OWNER has proposed that storm water runoff and trash generation from the PROPERTY be managed by the use of the following Storm Water Facilities which are identified as "Best Management Practices" or "BMPs": One (1) BioClean connector pipe screen, one (1) Stormcapture underground vault, one (1) set of Maxwell pre -well and drywells located in the southwestern corner of the site as shown on Exhibit "B". The precise location(s) and extent of the BMPs are indicated on the approved grading plans on file with CITY's Development Services Department as G19-0012. The manner and standards by which the BMPs must be repaired and maintained in order to retain their effectiveness and the approximate location of the BMPs are as set forth in the Operation and Maintenance Plan (hereinafter "O&M PLAN"), which is attached hereto and incorporated herein as Exhibit "C". SWFMA (G19-0012) https://gs.secure-recording.com/Batch/Confirmation/l6025544 1/2 RECORDING REQUESTED BY: CITY OF POWAY AND WHEN RECORDED MAIL TO: CITY CLERK CITY OF POWAY P O BOX 789 POWAY, CA 92074 APN: 317-280-57 (THIS SPACE FOR RECORDER'S USE) STORM WATER FACILITIES MAINTENANCE AGREEMENT Mobile Mini — 12345 Crosthwaite Circle (G 19-0012) The undersigned grantor(s) declares: Documentary Transfer Tax is $ -0- pursuant to R & T Code 11922 (conveyance to a Government Agency) This AGREEMENT for the maintenance and repair of certain Storm Water Facilities is entered into between the Property Owner(s) Crosthwaite Circle, LLC, a California limited liability company, (hereinafter referred to collectively as "OWNER") and the City of Poway (hereinafter referred to as "CITY") for the benefit of the CITY, the OWNER, the successors in interest to the CITY or the OWNER, and the public generally. WHEREAS, OWNER is the owner of certain real property located in the City of Poway, California, more particularly described in Exhibit "A", hereto (hereinafter referred to as the "PROPERTY"), which is replacing asphalt pavement with concrete in accordance with applications for Grading Permit Number G19-0012 , which are on file with the CITY. This Agreement is required as a condition of approval for such development. WHEREAS, in accordance with the California Regional Water Quality Control Board San Diego Region Order Number R9-2017-0077, (hereinafter referred to collectively as "Trash Amendment"), the City of Poway's Stormwater Management and Discharge Control Ordinance, Poway Municipal Code, Chapter 13 and 16 (the "Stormwater Ordinance"), the City of Poway Subdivision Ordinance, the City of Poway Zoning Ordinance, the City of Poway Grading Ordinance and/or other ordinances or regulations of CITY which regulate land development and urban runoff, OWNER has proposed that storm water runoff and trash generation from the PROPERTY be managed by the use of the following Storm Water Facilities which are identified as "Best Management Practices" or "BMPs": One (1) BioClean connector pipe screen, one (1) Stormcapture underground vault, one (1) set of Maxwell pre -well and drywells located in the southwestern corner of the site as shown on Exhibit "B". The precise location(s) and extent of the BMPs are indicated on the approved grading plans on file with CITY's Development Services Department as G19-0012. The manner and standards by which the BMPs must be repaired and maintained in order to retain their effectiveness and the approximate location of the BMPs are as set forth in the Operation and Maintenance Plan (hereinafter "O&M PLAN"), which is attached hereto and incorporated herein as Exhibit "C". SWFMA (G19-0012) Because additional impervious area may require the addition of or alteration of storm water facilities and strategies, no impervious area or additional drains may be added to the project site without prior approval from the City Engineer. WHEREAS, OWNER's representations that the BMPs will be maintained have been relied upon by CITY in approving OWNER's development applications. It is the purpose of this Agreement to assure that the BMPs are maintained, by creating obligations that are enforceable against the OWNER and the OWNER's successors in interest in the PROPERTY. It is intended that these obligations be enforceable notwithstanding other provisions related to BMP maintenance that are provided by law. NOW, THEREFORE, for consideration of (a) CITY's approval of the above development applications and (b) the mutual covenants set forth herein, IT IS HEREBY AGREED AS FOLLOWS: Incorporation of Recitals. The recitals set forth above are incorporated herein by this reference and constitute a part of this AGREEMENT 2. Maintenance of Storm Water Facilities. OWNER agrees, for itself and its successors in interest, to all or any portion of the PROPERTY, to comply in all respects with the requirements of the Stormwater Ordinance with regards to the maintenance of BMPs, and in particular agrees to perform, at its sole cost, expense and liability, the following "MAINTENANCE ACTIVITIES": all inspections, cleaning, repairs, servicing, maintenance and other actions specified in the O&M PLAN, with respect to all of the BMPs listed above, at the times and in the manner specified in the O&M PLAN. OWNER shall keep records of this maintenance and provide copies of such records and annual certification of maintenance as requested by CITY. OWNER shall initiate, perform and complete all MAINTENANCE ACTIVITIES at the required time, without request or demand from CITY or any other agency. OWNER further agrees that "MAINTENANCE ACTIVITIES" shall include replacement or modification of the BMPs in the event of failure. Replacement shall be with an identical type, size and model of BMP, except that: (a) The City Engineer may authorize substitution of an alternative BMP if he or she determines that it will be as effective as the failed BMP; and (b) If the failure of the BMP, in the judgment of the City Engineer, indicates that the BMP in use is inappropriate or inadequate to the circumstances, the BMP must be modified or replaced with a more effective BMP to prevent future failure in the same or similar circumstances. 3. Notices. OWNER further agrees that it shall, prior to transferring ownership of any land on which any of the above BMPs are located, or any lot or portion of the PROPERTY which is served by the above BMPs, and also prior to transferring ownership of any such BMP, provide clear written notice of the above described maintenance obligations to the transferee. 4. CITY's Right to Perform Maintenance. It is agreed that CITY shall have the right, but not the obligation, to elect to perform any or all of the MAINTENANCE ACTIVITIES if, in the CITY's sole judgment, OWNER has failed to perform the same. Such maintenance by the CITY shall be conducted in accordance with the nuisance abatement procedures set forth in Poway Municipal Code Chapter 8.72. In the case of maintenance performed by the CITY, it may be performed by CITY forces, or a contractor hired by the CITY, at the CITY's sole election. It is recognized and understood that the CITY makes no representation that it intends to or will perform any of the MAINTENANCE ACTIVITIES, and any election by CITY to perform any of the MAINTENANCE ACTIVITIES shall in no way relieve OWNER of its continuing maintenance obligations under this agreement. If CITY elects to perform any of the MAINTENANCE ACTIVITIES, it is understood that CITY shall be deemed to be acting as the agent of the OWNER SWFMA (G19-0012) Page 2 and said work shall be without warranty or representation by CITY as to safety or effectiveness, shall be deemed to be accepted by OWNER "as is", and shall be covered by OWNER's indemnity provisions below. If CITY performs any of the MAINTENANCE ACTIVITIES, after CITY has demanded that OWNER perform the same and OWNER has failed to do so within a reasonable time stated in the CITY's demand, then OWNER shall pay all of CITY's costs incurred in performing the MAINTENANCE ACTIVITIES, plus an administrative fee. OWNER's obligation to pay CITY's costs of performing MAINTENANCE ACTIVITIES is a continuing obligation. If OWNER fails to pay CITY's costs for performing MAINTENANCE ACTIVITIES, CITY may assess a lien on the property or properties of the responsible parties pursuant to the procedures set forth in Poway Municipal Code Chapter 8.72. 5. Grant of Easement to CITY. OWNER hereby grants to CITY a perpetual easement over, under and across all of the PROPERTY, for purposes of accessing the BMPs, inspecting the BMPs, and performing any of the MAINTENANCE ACTIVITIES specified in Paragraph 1 above. CITY shall have the right, at any time and upon reasonable notice to OWNER, to enter upon any part of said area as may be necessary or convenient for such purposes. OWNER shall at all times maintain the PROPERTY so as to make CITY's access clear and unobstructed. 6. Administration of Agreement for CITY. CITY hereby designates the City Engineer as the officer charged with responsibility and authority to administer this Agreement on behalf of CITY. Any notice or communication to the City related to the implementation of this Agreement shall be addressed to: City Engineer City of Poway 13325 Civic Center Drive Poway, CA 92064 7. Defense and Indemnity. CITY shall not be liable for, and OWNER and its successors in interest shall defend and indemnify CITY and the employees and agents of CITY (collectively "CITY PARTIES"), against any and all claims, demands, liability, judgments, awards, fines, mechanic's liens or other liens, labor disputes, losses, damages, expenses, charges or costs of any kind or character, including attorneys' fees and court costs (hereinafter collectively referred to as "CLAIMS"), related to this Agreement (specifically including but not limited to OWNER's alleged noncompliance with the Trash Amendment or the Stormwater Ordinance), and arising either directly or indirectly from any act, error, omission or negligence of OWNER, OWNER's successors, or their contractors, licensees, agents, servants or employees, including, without limitation, claims caused by the concurrent negligent act, error or omission, whether active or passive, of CITY PARTIES. OWNER shall have no obligation, however, to defend or indemnify CITY PARTIES from a claim if it is determined by a court of competent jurisdiction that such claim was caused by the sole negligence or willful misconduct of CITY PARTIES. Nothing in this Agreement, CITY's approval of the development application or plans and specifications, or inspection of the work is intended to acknowledge responsibility for any such matter, and CITY PARTIES shall have absolutely no responsibility or liability therefore unless otherwise provided by applicable law. 8. Allocation of Costs. Following the sale or transfer of any individual residential lots by OWNER, the cost of the MAINTENANCE ACTIVITIES required by this Agreement shall be divided equally by all lot owners, and paid by each lot owner or his or her heirs, assigns and successors in interest. This requirement shall be binding on all lot owners in the subdivision, and each shall be responsible for his or her equal share of the cost associated with the maintenance. SWFMA (G19-0012) Page 3 9. Agreement Binds Successors and Runs With the PROPERTY. It is understood and agreed that the terms, covenants and conditions herein contained shall constitute covenants running with the land and shall be binding upon the heirs, executors, administrators, successors and assigns of OWNER and CITY, shall be deemed to be for the benefit of all persons owning any interest in the PROPERTY (including the interest of CITY or its successors in the easement granted herein). It is the intent of the parties hereto that this Agreement shall be recorded and shall be binding upon all persons purchasing or otherwise acquiring all or any lot, unit or other portion of the PROPERTY, who shall be deemed to have consented to and become bound by all the provisions hereof. 10. OWNER's Continuing Responsibilities Where Work Commenced or Permit Obtained. Notwithstanding any other provision of this Agreement, no transfer or conveyance of the PROPERTY or any portion thereof shall in any way relieve OWNER of or otherwise affect OWNER's responsibilities for installation or maintenance of BMPs which may have arisen under the ordinances or regulations of CITY referred to in this Agreement, or other federal, state or CITY laws, on account of OWNER having obtained a permit which creates such obligations or having commenced grading, construction or other land disturbance work. 11. Amendment and Release. The terms of this Agreement may be modified only by a written amendment approved and signed by the Director of Development Services acting on behalf of CITY and by OWNER or OWNER's successor(s) in interest. This Agreement may be terminated and OWNER and the PROPERTY released from the covenants set forth herein, by a release, which CITY may execute if it determines that another mechanism will assure the ongoing maintenance of the BMPs or that it is no longer necessary to assure such maintenance. 12. Governing Law and Severability. This Agreement shall be governed by the laws of the State of California. Venue in any action related to this Agreement shall be in the Superior Court of the State of California, County of San Diego. OWNER hereby waives any right to remove any such action from San Diego County as is otherwise permitted by California Code of Civil Procedure Section 394. 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. 13. Attorney's Fees. The prevailing party in any action or proceeding to enforce or interpret the terms of this Agreement shall be entitled to recover all of its reasonable litigation expenses, including its expert fees, attorneys' fees, courts costs, arbitration costs, and any other fees. IN WITNESS WHEREOF, the parties have executed this Agreement on the dates set forth hereinafter. OWNER: Crosthwaite Cie California limited liability company By: c� Date: -VZobert Tho s, Owner If JULIE ANN LYSSY �P{iV PVC i�� A Notary Public, State of Texas 5; Comm. Expires 09-14-2024 signature must be notarized) / Of Notary ID 1058900 SWFMA (G19-0012) CITY OF POWAY: Rob rt J. Manis Dire for of Development Services APPROVED AS TO FORM: Office of the City Attorney V Alan Fenstermacher City Attorney Date: 7/1 �i (signature must be notarized) Attachments 1. Certificate of Acceptance 2. Exhibit A — Legal Description of Property 3. Exhibit B — Location of BMPs 4. Exhibit C — Operation and Maintenance Plan APPROVED AS TO CONTENT: Engineenn Division 4Meody cco, P. E. City Engineer SWFMA (G19-0012) Page 5 CALIFORNIA ALL-PURPOSE ACKNOWLEDGMENT 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 ) County of San Diego ) On July 13, 2023 Date personally appeared before me, Yvonne Mannion, Notary Public Here Insert Name and Title of the Officer Robert J. Manis 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. 'sF YVONNE MANNION Notary Public - California z San Diego County _- Commission # 2363699 My Comm. Expires Jul 12025 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 , , . tic / ' Signature of Notary Public l_� Place Notary Seal Above OPTIONAL Though this section is optional, completing this information can deter alteration of the document or fraudulent reattachment of this form to an unintended document. Description of Attached Document Title or Type of Document: Storm Water Document Date: Signer(s) Other Than Named Above: _ Facilities Maintenance Agreement G19-0012 Capacity(ies) Claimed by Signer(s) Signer's Name: ❑ Corporate Officer — Title(s): ❑ Partner — ❑ Limited ❑ General ❑ Individual ❑ Attorney in Fact ❑ Trustee ❑ Guardian or Conservator I -I nthAr' Signer Is Representing: 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: ©2016 National Notary Association • www.NationalNotary.org • 1-800-US NOTARY (1-800-876-6827) Item #5907 CERTIFICATE OF ACCEPTANCE (Storm Water Facilities Maintenance Agreement) This is to certify that the interest in real property located in the City of Poway conveyed by the Grant of Easement described in Item 5 of the attached document dated 6 _ 0"f12 — 0 Z 1 , from Crosthwaite Circle, LLC, a California limited liability company, to the City of Poway, a political corporation and/or governmental agency, is hereby accepted by the undersigned officer or agent on behalf of the City Council pursuant to authority conferred by Resolution No. 17-007 adopted on April 18, 2017. 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O ULli a > z > z O O O O Q U) W Q Q N N N N Z z LL co c6 co co Q a- z O W � W a J O O ~ w D a Z W Z W J Q U O U (n z W W UZ W o �cnU)._C) a_ I-- ❑ 0 ° CO z U } W W_ w > > W O U z 00 {�'�J N d D U) Q W' m-i J 1— `�_' O O d ~UJ❑-j win-jw W W U wZ �o W m z wz0tY� ¢ X Q Uw OU L-N �rn- Z O d JanQz W ZZ Z U :E Z 2 Z O Z mU) Z � 't � � Qrn W ZOOOt- O O O O W WUcco U) � U) d W a~ Q o, LLl o o �U�� U U J U U U U w UWm ❑ 0 L w 0O w 0 w w w w ® co ZQ W m m 0 cq 0 d ❑ ❑ ❑ ❑ 2 o -t U) F- STORMCAPTURE INSPECTION & MAINTENANCE MANUAL General Inspection and maintenance of the StormCapture system is vital for the satisfactory performance and lifecycle of the stormwater management system. Permit requirements, local, state and federal regulations, along with Oldcastle and any incorporated device manufacturer recommendations must be followed for system compliance. The StormCapture design provides manway access for ease of inspection and debris removal if required. Flushing, which can cause particle displacement, undermining and internal disturbance, is not recommended for gravel foundation, open bottom systems. Flushing is acceptable in systems with concrete bases. Inlet controls, internal or external, are recommended for controlling, monitoring and maintaining the StormCapture system. External Inlets are typically devices that are separate from the StormCapture modules. These external devices receive site stormwater and are designed with manway access for maintenance and typically include an internal sump for sediment capture. External inlets may receive single or multiple pipes and incorporate an open grated top with an outfall pipe to the StormCapture system. Grated inlets may incorporate protection devices or baffles to capture floatables or the "first flush". Scheduled inspections and maintenance shall include the removal of any sedimentation build up in the external inlets. Debris or sedimentation build up shall not exceed 3" below an outfall elevation. Internal components may be incorporated for pre-treatment. Manufacturer recommendations must be followed. Scheduled maintenance and inspection will include removal of debris and sediments by manual or mechanical means. Maintenance Modules (MM's) are optional internal control modules based on design preference. MM's are modules with roof manway access openings and provide the primary means of access to the StormCapture system for scheduled inspection and maintenance. In addition, MM's may incorporate weirs or baffles to enhance reduction or removal of Total Suspended Solids (TSS) from the stormwater. Placement of internal components must be part of the system engineering and design. Grated inlets can be incorporated to accommodate surface stormwater flows into the StormCapture and may include an inlet protection device. Scheduled inspection and manufacturer recommendations for maintenance must be followed. For open bottom systems (no concrete floor), concrete splash pads may be installed below inlet grate openings and pipe inlets to prevent base erosion. During scheduled inspection and maintenance activities, the concrete splash pads must be inspected for proper function and any sediment shall be removed. Standard StormCapture module design incorporates lateral and longitudinal passageways between modules to accommodate internal stormwater conveyance between modules. These passageways may be of a window configuration with standard 12" tall sediment baffles below the windows extending from the internal module invert, or doorway configurations extending from the floor slab. Any sediment and debris build up over 6" deep inside a module shall be removed by manual or mechanical means. Removal by vacuum is recommended. Internal module flushing, which can cause particle displacement, undermining or internal disturbance, is prohibited. Inspection Frequency Oldcastle recommends that the StormCapture system be inspected quarterly, and following any significant rain events within the first year of operation. Standard Operating Procedures shall specify an annual inspection and maintenance plan as required thereafter or as stated in the permit, or as required by other governing regulations. Only authorized and trained personnel shall inspect and enter a StormCapture system. Personnel must be properly trained and equipped before entering any underground or confined space structure. Training includes being familiar with and following any local, state and federal regulations governing the operation, inspection and maintenance of underground structures, as well as specific StormCapture system requirements. Inspection Activities During inspection, a minimum of the following shall be inspected: • Contributing drainage area inlets are clear of debris. • If the StormCapture system is an exfiltration system (open bottom with stormwater percolating into the ground), monitor and confirm that the system drains completely within a reasonable time or the required permit time. • Sediment depths within the modules (anything over 6" deep shall be removed as outlined above). • Inlet and outlet pipe penetrations to check for movement and/or leakage. • Movement of modules. • General interior condition of modules to look for concrete cracking or deterioration. • Condition of pre-treatment devices, baffles and polishing devices if part of the system. Recordkeeping A log must be kept of all inspection and maintenance activities. OPERATION AND MAINTENANCE MANUAL The MaxWell° Plus Drainage System TORRENT Torrent Resources Incorporated The watermark for drainage solutions CompanyOverview....................................................................................... 3 GeneralPurpose.......................................................................................... 3 MaxWell° Plus Description.............................................................................. 3 Installation................................................................................................... 4 Operation...................................................................................................4 Maintenance................................................................................................ 5 Appendix...................................................................................................8 E _ Torrent Resources Incorporated ... an Employee -Owned Company. First licensed as a drainage contractor, Torrent Resources has evolved into a full -service; drainage solutions partner to address ever-growing customer needs in California, Arizona, New Mexico, Nevada and Texas. The company is headquartered in Phoenix, with an additional office in Fontana, California. Since 1972, Torrent Resources has set the standard in design and construction of water drainage systems for the mitigation of excess surface water. In 1974, the company revolutionized the industry with its exclusive, patented MaxWeIF systems — products unmatched in efficiency and reliability by any other type of stormwater disposal application. To date, more than 80,000 MaxWell drywells have been installed throughout the western United States. With a greater awareness of the need to address the quality of urban stormwater runoff, on -site drainage systems used for the stormwater elimination have come under closer scrutiny. One such system is the drywell which has been used previously throughout the United States to dispose of retained or surplus surface water. The early versions of this structure were not much more than holes in the ground filled with rocks. This meant that maintenance on these primitive types was impossible, and inundation from silt - loading quickly led to clogging and failure of the drywells. Fortunately, the introduction of the MaxWell concept provided a solution to this problem by incorporating a deep settling basin to trap out the suspended solids for easy removal during routine cleaning. To that end, all MaxWell drainage systems are designed to remove not only sediment and debris, but also floating hydrocarbons and organic compounds prior to recharging the treated stormwater back into the sub -grade. The water is then further polished by the soil envelope as it passes through the vadose zone to eventually replenish the resource. The MaxWell is a treatment BMP which also utilizes infiltration to recycle surface water for reuse. In most cases, the system will be utilized in one of two applications: mitigation of the entire amount of retained water from a rainfall event of some historic frequency and duration, in which case the product would be considered volume -based; or, removal of only first flush constituents from an incremental portion of a larger rainfall event. In the latter, the system would be considered a flow -based BMP. The system itself is not intended to provide storage volume, but instead is designed to gradually dispose of accumulated stormwater to ensure maximum pre-treatment efficiency. Therefore, in both applications described above, a means of storing the required capture volume should be provided separately. This can be done in shallow surface basins or planter areas with the drywells incorporated into the low spots, or by interconnecting the drainage systems to underground tanks or vaults. This allows the minimum number of drainage systems to be used to percolate the water into the sub soils, using the total allowable draw -down timeframe. More systems could be used in lieu of storage to increase processing rates, but this is generally not as cost-effective as providing a means or retaining the required volume. Preliminary treatment is provided in the dual -chambered MaxWell Plus System through the collection and separation in deep, large volume settling chambers. Depending upon the permeability of the soils, the pilot - hole excavations for the drywells may be up to 180 feet deep. 3 The typical MaxWell Plus provides over 2,500 gallons of chamber capacity to process incoming water for the removal of suspended solids and floating organic compounds. These chambers are constructed of 4000 PSI pre -cast concrete liner segments that are 48-inches I.D., 54-inches O.D. with a 3-inch wall thickness. In constructing the chambers, these sections are carefully aligned, centered, and stacked in the borehole to maximize bearing surfaces. A filter sleeve made of non -woven geotextile fabric is placed inside the drilled shaft to encapsulate the aggregate backfill, and inhibit the migration of fines from the surrounding soils into the gravelpack. Next, a corrugated HDPE drainage pipe with a slotted Schedule 40 PVC drainage screen attached to the lower end is inserted into the pilot -hole excavation. This component is then capped and suspended slightly off the bottom of the borehole. Clean, washed aggregate sized between 3/8" to 1 '/2' to best complement site soil conditions is utilized for the backfill material surrounding the drainage pipe in the lower excavation of the main well. The pre -cast concrete chambers are then erected in the 72-inch diameter reamed portions of the upper excavation. An overflow pipe constructed of Schedule 40 PVC is installed in the main chamber, and is mated to the drainage pipe with a coupling under the chamber bottom. This vertical pipe is supported by a fusion - bonded epoxy -coated galvanized steel bracket attached to the liner wall. Our PureRo° Debris Shield equipped with an internal screen is then fitted onto the top of the overflow inlet. This cylindrical shield is approximately 24-inches in length, and is fabricated from rolled 16-gauge galvanized steel. The component is coated with fusion -bonded epoxy, and fitted with an anti -siphon vent. In operation, the shield forces water to be drawn into the system from several inches beneath the surface, effectively isolating and containing floating trash, paper, debris and pavement oils within the chambers. The internal screen effectively filters out suspended material, and the vent prevents floating debris from being sucked into the overflow pipe as the water level inside the chamber subsides. The primary settling chamber is interconnected to the main well with a 4-inch diameter Schedule 40 PVC pipe installed with a two percent slope between chambers. This connecting pipe is feed through a vented, shielded and screened inlet that is fitted with a reduction orifice. This component narrows the opening of the 4-inch pipe to 2-inches to manage excessive inflow velocity, and provide a manageable metered flow to the main well. The restriction also increases the residence time of the water in the inlet structure, thereby further enhancing the gravity settlement of suspended solids. Each chamber of this design is equipped with two hydrophobic floating absorbent pillows, which will remove a wide range of hydrocarbons and organic liquids. The sponges are 100% water repellant, and literally "wick" floating petrochemical compounds from the surface of the water. Each pillow has a removal capacity of at least 128 ounces to accommodate effective, long-term treatment. At the surface of the ground, the inlet structure will be equipped with a 24" or 30" diameter cast-iron grate and ring assembly, while the main well will be fitted with a 30-inch diameter cast-iron ring and solid cover. See Appendix 1-A for MaxWell detail. Once the locations of any utilities have been identified, the exact locations of the drywell chambers on the jobsite are laid out and identified by the Civil Designer's survey team. When installed with standard inverts, the layout requires center stakes for each chamber, with (2) 10-foot offsets, 90 degrees apart. The installation begins with the excavation of a pilot -hole boring, which will be accomplished using either a bucket -auger drill rig, or a SoilMec machine. When a bucket -auger is utilized, the initial borehole is drilled using a 48-inch diameter bucket. The upper part of this excavation where the chamber will be built must be enlarged to 72-inches, in order to provide sufficient access to stack the liner segments, and place the aggregate backfill around the outside of the chamber. In order to expand the upper portion of the drilled 2 shaft from 4-feet to 6-feet, Torrent uses reaming knives attached to the 48-inch diameter bucket. If a SoilMec is used, a 6-foot diameter flight auger is used to begin the shaft, which is changed to a 4-foot diameter auger after the upper excavation is completed. In either case, the enlargement of the upper portion of the excavation to 72-inches in diameter provides the working access needed to erect the chamber and place the gravel pack. It is vital to the function of the finished drainage system that a continuous 10-foot interface is achieved with some sort of suitable permeable drainage material at the terminus of the excavation. As the drilling progresses and each load of cuttings is discharged, the composition of the drainage soils is assessed for suitable permeability. Optimum permeability is found in soils comprised of clean sand, gravel and small cobbles, with an absence of silt, clay or excessive fines. However, other materials may possess acceptable transmissibility, such as clean sand or decomposed granite. It is significant to note that the crew that completes the excavation for the systems is not the crew that will build the finished structures. When the drilling is completed, the drilling crew will leave the site protected by covering the open holes with steel plates, and constructing a berm around the immediate well site. Barricades and flagging are additionally utilized to protect the drilled shafts after the excavation is complete. A construction crew will then arrive within a day or two to finish the installation process. The actual construction sequence begins with pulling the plates back far enough to allow the placement of a setting platform over the first open boring. The first component lowered into the excavation is the slotted drainage screen, connected to the lower end of the drainage pipe. The material used for the drainage pipe is heavy-duty ADS Highway Grade corrugated polyethylene. This HDPE drainage pipe is lowered into position, and held slightly off the bottom of the pilot -hole. The pipe is then capped and suspended by a chain, which has been secured to the setting platform above the excavation. As the fabrication progresses, the protective steel plates are pulled completely away so that there is access for the backfill operation. A skip loader is utilized to place the gravelpack into the entire length of the 48- inch pilot hole around the suspended drainage pipe. Next, the lower perforated section of 48-inch precast liner for the main well is lowered into place within the enlarged 6-foot diameter excavation. Additional liner segments are carefully aligned and stacked in the enlarged portion of the shaft to create the settling chamber of the system. The last section to be placed at grade is a modified manhole cone. The opening in the manhole cone is covered to prevent the accidental introduction of gravel as the upper excavation is backfilled with this same washed, graded aggregate. The trench between the chambers of the MaxWell Plus System is excavated from the surface with a backhoe. A 4-inch diameter Schedule 40 PVC pipe is placed into this trench to interconnect the inlet structure to the main drywell settling chamber. Piping connections through the liner walls are mudded after the connecting pipe has been stubbed -out in the chambers. The assembled intake inlet for the Primary Settling Chamber is then installed. At the top of this component, a PVC tee is utilized to connect the anti -siphon vent to the intake screen below. The completed vented intake assembly is then fitted to the stubbed -out connecting pipe inside the inlet structure. As a good workmanship measure, a stabilizing slurry mixture is utilized to backfill the trench holding the connecting pipe between the chambers so that the potential for subsidence is minimized. This same slurry envelope is placed around all deep piping connections, and around the cone sections of the upper chambers. This material effectively encapsulates the components, and approximates the compaction of native soil. With the chambers completed, the interior components are installed. The overflow pipe is lowered into position in the main well chamber as assembly progresses. Each chamber is equipped with two hydrophobic floating absorbent pillows for the removal of a wide range of petroleum -based organic liquids. One blanket in each chamber is filled with a unique type of polymer plastic bead which resists the release of these constituents, even if compressed. After securing the grate to the cast-iron ring, a layer of ultraviolet -resistant geotextile fabric is applied over the grate. This UV -resistant fabric layer is banded to the grated inlet, and is intended to prevent incidental introduction of trash or debris before the well goes into service. This fabric will be removed by the General Contractor after final landscaping and paving are completed. Premature fabric removal could result in system damage and may void some, or all warranty conditions. The metal grates and covers used are embossed with the Torrent Resources company name, the MaxWell trade name, and the words "Storm Water Only" as a general reminder to the public as to the intended usage of the structure. The final step in the installation process is the application of a mortar mix to affix the ring and grate assemblies securely to the manhole cones. This completes the construction sequence. Incoming water from the surface grated inlets or connecting pipes is received in the primary settling chamber where silt and other heavy particles settle to the bottom. A vented, screened and shielded inlet ensures containment of floating debris within the chamber, and elimination of petroleum constituents through two floating absorbent pillows. When installed in optimum drainage materials, the pre-treated flow is then regulated to a maximum design rate of up to 0.25 cfs, and directed to a secondary settling chamber. Here the pre-treatment separation and containment process is repeated, thereby effectively achieving controlled, uniform treatment. The system is drained as water rises under the PureFlo� Debris Shield, and spills into the top of the overflow pipe. The drainage assembly returns the cleaned water to the surrounding soil through the FloFasr Drainage Screen. To provide prompt removal of pavement oils, both MaxWell Plus settling chambers are equipped with two absorbent pillows. These floating pillow -like devices are 100 percent water repellent and literally wick petrochemical compounds from the water. Each sponge has a capacity of at least 100 ounces to accommodate effective, long-term treatment. These absorbent pillows are completely inert, and will safely remove runoff constituents down to rainbow sheens which are typically no more than one molecule thick. All MaxWell Plus Systems are equipped with bolted, theft -deterrent cast iron grates and covers as standard security features. Special inset castings are available for use in landscaped applications, which are resistant to loosening from accidental impact. Machined mating surfaces, and "Storm Water Only" wording are standard on these components. The responsible party, such as a Property Management Company or Homeowners Association, is typically responsible for maintaining the drywell(s). New systems should receive a thorough visual examination following the first several significant rainfall events. This assessment will assure that there is no standing water, and that runoff or nuisance water flows are being eliminated within the allowable 48 hour draw -down timeframe. Beyond that, the drainage structures should be inspected once a year and within 48 hours of a significant storm event to ensure that there is no standing water in the chambers. Standing water problems are usually caused by inadequate performance of the existing drainage systems on the property. Reasons are varied but may be due to system aging, reduced soil permeability, pavement settlement, ineffective site maintenance, property expansions and additions, or change in property usage. 59 If a drywell is draining slowly or leaves water standing over the grate for longer than regulations allow, debris may simply be blocking the inlet. The maintenance guidelines begin with the performance of an annual inspection, which should include assessing the need for cleaning and inspecting the functional and structural continuity of the system. At the same time, surface aspects of the drainage way are evaluated for evidence of staining or standing water. A typical cleaning is carried out using a truck -mounted hydro-vactor (see below) when accumulated trash, debris, and sediment occupy 15% or more of the original settling chamber capacity. The hydro-vactor utilizes streams of air and high-pressure water to dislodge built-up material, which is then removed via vacuum hose and disposed of off -site. Inlet grates and covers are removed for this operation and all filters and screens are cleaned during this procedure. At the same time, any obstructions or accumulated debris in remote inlets and connecting pipes is removed by jet-rodding. The cleaning operation also involves replacement of the floating absorbent pillows and changing out the filter fabric at the bottom of the chambers where applicable. After the initial cleaning, most systems generally will not require subsequent cleaning for 3-5 years. When afforded regularly scheduled maintenance, our records indicate that our MaxWell Drywells will provide decades of efficient, reliable service. A written log shall be kept of all inspections and maintenance actions performed on the drywell systems. Typical Hydrovactor Truck used for Drywell Maintenance 7 J 41k The MaxWelle Plus Drainage System Detail And Specifications q� q. 1 " ro MIN SEPARATION lu .._t -. :(:":^i •: .i-is�:;-irr;: rr::�::�:�;r: ir.dr.:: {{:.. ....::.. .::.......r: m u. w .:::.:::.::::::• :•::•:::: z2= 24 ::-� ::..............................a.................. r1 23 6r Q O 12 ' 1 Wa'xWell"Plus tifa'I�jaC'Jfaf a14 it 5'.3,m 0, TORRENT RESOURCES An molution of McGuatn ON ling w•Ahvt0 MnjM0U wM A 1ONA 662 26a U, av AAA 702 :J C 1;94 ­UVORNA 681 947-, 0 d O NOTES 13 1. MANHOLE CONE - MODIFIED FLAT BOTTOM. 2 STABILIZED BACKFILL - 1 SACK SLURRY 3. BOLTED RING & GRATEICOVER- DIAMETFR AS SHOWN CLEAN CAST IRON WITH WORDING "STORMWATFR ONLY" IN RAISED I.ETTERS, BOLTED IN 2 LOCATIONSAND SECURED TO CONE WITH MORTAR. RIM ELEVATION tJ.02"OFPL.ANS. GRADED BASIN OR PAVING (BY OTHERS). 5. COMPACTED BASE MATERIAL (BY OTHERS). G. PUREFLOr DEBRIS SHIELD - ROLLED 16 GA. STEEL X 24" LENGTH. WITH. VENTED ANTI -SIPHON AND INTERNAL 265' MAX. SWO FLATTENED EXPANDED STEEL SCREEN X 12' LENGTH FUSION BONDED EPDXY COATED, T.. PRE -CAST LINER - 4000 PSI CONCRETE tX' ID. X 54' OD. CENTER IN HOLE AND ALIGN SECTIONS TO MAXIMIZE BEARING SURFACE 8 MIN. V 0 DRILLED SHAFT 9. SUPPORT BRACKET- FORRIED 12 GA, STEEL, FUSION BONDED EPDXY COATED. 13, OVERFLOW PIPE - SCH..0 PVC MATED TO DRAINAGE PIPE AT BASE SEAL. 11- DRAINAGE PIPE -ADS HIGHWAY GRADE WITH TRI-ACOUPLER, SUSPENDPIPEDURING BACKFILL OPERATIONS TO PREVENT BUCKLING OR BREAKAGE. DIAMETER AS NOTED. 12, BASE SEAL -GFOTF.XTILE OR CONCRETE SLURRY 13, ROCK - WASHFD, SIZED BETWEEN 315' AND 1-112" TO BEST COMPLEMENT SOIL CONDITIONS. 14. FLOFAST" DRAINAGE SCREEN - SCH. 43 PV'_' J.120" SLOTTED WELL SCREEN WITH 32 SLOTS PER ROWFT DIAMETER VARIES 120" OVERALL LENGTH WITH TRI-B COUPLER. 15. MIN. A' 0 SHAFT - DRILLED TO MAINTAIN PERMEABILITY OF DRAINAGE SOILS 16. FABRIC SEAL- U.V,RESISTANTGEOTEXTILE- TOBEREMOVEDBYCUSTOMERAT PROJECT COMPLETION. 17 ABSORBENT- HYDROPHOBIC PETROCHEMICAL SPONGF, MIN 128 OZ CAPACITY 18, CONNECTOR PIPE -4" 0 SCH 40 PVC . 19, ANTI -SIPHON VENT WITH FLOW REGULATOR 20, INTAKE SCREEN - SCH. 40 PVC 0.120" MODIFIED SLOTTED WELL SCREEN WITH 32 SLOTS PER ROW+FT 46' OVERALL LENGTH WITH TRI-C END CAP. 21. FREEBOARD DEPTH VARIESWITH INLET PIPE ELEVATION. INCREASE PRIMARY SECONDARY SETTLING CHAMBER DEPTHS AS NEEDED TO MAINTAIN .ALL INLET PIPE ELEVATION S ABOVE CONNECTOR PIPE OVERFLOW 22 EIGHT (8) PERFORATIONS PER FOOT, 2 ROWS MIN, 23 MOISTURE MEMBRANE- 6 MIL. PLASTIC PLACE SECURELY AGAINST ECCENTRIC CONE AND HOLE SIDEWALL. USED IN LIEU OF SLURRY IN LANDSCAPED AREAS. 24, INLET PIPE (BY +OTHERS). n 8 C