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41 -068 1091 Westhampton Rd 2015-10-06 (1) storm water requirementsCity of Northampton Department of Public Works STORMWATER MANAGEMENT PERMIT APPLICATION DECISION Project/ Site Name: TJDL Development -Connnon Drive & 3 Single Family Lots Project Street or Location/ Assessor ID: 1089, 1091 and 1093 Westhampton Rd, Northampton Applicant Name: TJDL Development LLC c/o Tim Seney Applicant Address/Phone: 262 East St., Easthampton, MAO 1027 Application Submission Date:~8~/2~6~/~2~0~15~------------------- THE FOLLOWING ACTION BY THE NORTHAMPTON DEPARTMENT OF PUBLIC WORKS HAS BEEN TAKEN ON TIDS APPLICATION BASED ON INFORMATION PRESENTED: Disapproval of the Stormwater Management Permit Application based on a determination within seven days of the receipt of the application that the application is administratively incomplete (see attached documentation). Approval of the Stormwater Management Permit Application. __K_ Approval of the Stormwater Management Permit Application subject to any conditions, modifications or restrictions required by the Department of Public Works (see below) Disapproval of the Stormwater Management Permit Application based upon a determination that the proposed plan, as submitted, does not meet the purposes set forth in the Northampton Stormwater Management. Standard Permit Conditions: 1. All clearing, grading, drainage, construction, and development shall be conducted in strict accordance with the following plans and information submitted with the application and as amended by any conditions attached to this permit: a. Runoff & Erosion Control Plan, 1089, 1090 & 1091 Westhampton Road, Northampton, MA for TJDL Development LLC, Sheets 1 & 2, dated 8/18/2015, stamped by Gregory J. Newman, P.E., Newman Envirorrmental Engineering. b. Stormwater Management Permit Application binder including Storm water Permit Application, Stormwater Report, Site Soil Data, and Stormwater Runoff M:\Stormwater Permits\Westhampton Rd_TJDL Development\Westhampton Rd_TJDL Dcvelopmcnt_20151006.docx Page I of 4 Calculations, dated August 2015, prepared by Gregory J. Newman, P.E., Newman Environmental Engineering. c. Massachusetts Department of Environmental Protection Checklist for Stonnwater Report, dated 8/18/2015, stamped by Gregory J. Newman, P.E., Newman Environmental Engineering. 2. The Northampton Department of Public Works (DPW) or its authorized representative shall be provided access to the property to conduct inspections before, during, and after construction activities as necessary. The applicant shall arrange with the DPW to schedule the following inspections: Initial Inspection, Erosion Control Inspection, Bury Inspection, and Final Inspection. The DPW may also conduct random inspections to ensure effective control of erosion and sedimentation during all phases of construction. 3. The owner shall retain the design engineer to document the construction of proposed stormwater infrastructure. The design engineer shall check elevations, inverts, layout and other critical aspects of the system as they are being constructed. At the completion of the work, including construction of stormwater management facilities and landscaping, the applicant shall submit to the DPW as-built plans stamped by a professional engineer of record in the Commonwealth of Massachusetts and a statement from a professional engineer of record in the Commonwealth of Massachusetts certifying that the materials and construction of the stormwater management system was constructed in accordance with the approved plans and will function as designed. All changes to the approved stormwater facilities shall be documented by a professional engineer of record in the Commonwealth of Massachusetts and approved by the DPW prior to submission of as- built plans and the certification statement described above. The preparation of as-built plans requires routine inspections and surveying of stormwater system components while they are being constructed. 4. Annual Reports that are stamped by a Registered Professional Engineer documenting the actions completed as required by the Operation, Maintenance and Inspection Agreement shall be submitted to the Northampton Department of Public Works by October 1 '1 of each year (see Specific Condition 1 below). 5. If construction of the proposed storm water system has not started within five years of the issue date of this permit, then the permit will expire and a new permit will be required. Construction is defined as clearing, grading, excavation, filling, and installation of drainage structures on the lots specified in this permit. Specific Permit Conditions: 1. Prior to start of construction and issuance of any Building Permits, the applicant shall record an executed Stormwater Operation, Maintenance, and Inspection Agreement that is binding on all subsequent owners of land served by the private stormwater management facility by recording it in the land records of the Registry of Deeds. The maintenance schedule and responsibility for maintenance of all components of the proposed stormwater management system must be adequately specified in Attachment A M:\Stormwater Permits\Westhampton Rd_ TJDL Development\ Westhampton Rd_ TJDL Development_ 20151006.docx Page2of4 to this Agreement. The Long-Term Pollution Prevention Plan -Operation and Maintenance Plan submitted as part of the Storm water Report dated August 2015 must be revised to the satisfaction of the Northampton DPW including but not limited to: inspection and maintenance schedules for: the level lip spreaders, the outlet control structures and drop inlet structures. The DPW can provide additional guidance on required revisions to the maintenance schedule. The final agreement shall be approved by the Northampton DPW and signed by the owner and the Mayor of Northampton. The final agreement shall be recorded at the Registry of Deeds at the owner's expense. Section 281-8 of the Northampton Stormwater Management Ordinance provides additional guidance for the requirements of this agreement. 2. This project will be required to submit one or more Notice oflntent (NOI) to the U.S. EPA for coverage under the NPDES Stormwater Construction General Permit. A copy of the final NOI and Stormwater Pollution Prevention Plan (SWPPP) shall be submitted to the Northampton DPW for approval prior to the start of construction and prior to issuance of a building permit. The SWPPP and the Erosion Control Plan for the project must be revised to include locations, specifications and timing of all sediment and erosion control measures. 3. The proposed stormwater management system is designed to mitigate peak stormwater flows. If, after construction of the proposed system, the system is found to increase stormwater flows or pollutants in these flows to adjacent properties, roadways and stormwater systems, the owner shall redesign and reconstruct the drainage system to prevent any increased stormwater flows to adjacent properties, roadways and stormwater systems. 4. All detention basins, outlets, vegetated swales, level-lip spreaders and other non-piped components of the proposed stormwater system shall be constructed as proposed and stabilized as soon as possible during construction of the driveway and preferably prior to receiving drainage flows from the proposed development. Additional erosion and sediment control structures may be required during construction. 5. The Runoff and Erosion Control Plans specify the Limit of Clearing and the area of proposed impervious surface and conceptual future house sites. Any expansion of the cleared area beyond that specified on the plan or increase in the area of the driveway, house, or any impervious surface as specified on the approved plans shall require approval by the DPW and may require an amendment to this Stormwater Management Permit or a new Stormwater Management Permit. Total impervious area of each of the proposed house lots shall be submitted to the DPW for approval prior to issuance of a building permit and prior to the start of construction of each house. 6. Prior to issuance of any certificate of occupancy, the driveways and the drainage system shall be constructed as proposed and conditioned by this permit, and all land adjacent to the driveway shall be stabilized and vegetation established. M:\Stormwater Permits\ Westhampton Rd_ TJDL Development\ Westhampton Rd _TJDL Developmcnt_20151006.docx Page 3 of4 7. The drainage areas shown on Figure 3: Drainage -Post-Development Site Plan and the proposed routing of drainage areas used in the Post-Development Stormwater Runoff Calculations must be consistent with the proposed grading shown on Sheet 1 and 2, Runoff & Erosion Control Plan. Specifically, the grading of the common drive on Plan Sheet I between Station 7+00 to Station IO+ 75 must clearly show flow to the swale on the north side of the common drive and to the detention basin and the grading of the common drive on Sheet I between Station 10+ 7 5 to Station 13+00 must also show drainage flows to the swales on the north side of the common drive. A revised plan must be submitted to the DPW within 30 days for approval showing detailed grading as necessary to specify accurate drainage flow paths particularly for the upper portion of the proposed common driveway and the flow to swales and the detention basin as discussed above. 8. Although recharge of stormwater must be met for the site only to the extent practicable, additional recharge capacity must be considered for individual house lot construction. Additional recharge capacity must be provided for roof runoff as feasible through the construction of drywells, infiltration chambers or infiltration basins. Signature o cc. Planning Board c/o Office of Planning and Development Building Department 11/t,(s'~ ate Conservation Commission c/o Office of Planning and Development M:\Stormwater Pennits\Westhampton Rd_TJDL Development\Westhampton Rd_TJDL Development_20151006.docx Page 4 of 4