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38A-104 Village Hill Rd- application decision'~ 2, i A-~~ 1. (• \ti ` City of Northampton Department of Public Works STORMWATER MANAGEMENT PERMIT APPLICATION DECISION Project /Site Name: Villa e Hill (Phase 2) Project Street or Location /Assessor ID: Former State Hospital propert~(North Campus) Villas7e Hill Road /Assessor's Map 38A Parcel(s) 104 107 108 110 111 and Map 31C Parce1017 Applicant Name: TCB Hospital Hill, LLC c/o The Cornrnunity Builders Applicant Address/Phone: 95 Berkley Street, Boston, MA 02116-6240 / 413-731-9790 Owner Narne: Hospital Hill Development LLC c/o MassDevelopment Owner Address/Phone: 33 Andrews Parkway, Devens. MA 01432 / 978-784-2917 Application Submission Date: 4[4/2007 THE FOLLOWING ACTION BY THE NORTHAMPTON DEPARTMENT OF PUBLIC WORKS HAS BEEN TAKEN ON THIS APPLICATION BA5ED 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. X 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: E:\Stormwater Permits\Stormwater Permits\Permits_new applications\Village Hill (Phase 2).doc _ Page l of 4_ _ _ _ _ _ a. Village Hill, Northampton, Massachusetts, Definitive- Subdivision Plan, Sheets 0.1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 3.1, 4.1, 4.2, 4.3, 4.4, 5.1, 5.2, 5.4, 5.5, 6.0, 7.1, 7.2, 7.3, 7.4 Revised 4/4/2007, Sheet 3.2 revised 5/31/2007, Sheet 5.3 revised 6/7/2007, and Sheet 5.6 dated 6/12/2007, by Berkshire Design Group, Inc., stamped by Mark B. Darnold, P.E., Berkshire Design Group, Inc. b. Stormwater Drainage Report Booklet for Village Hill, Northampton, Massachusetts, dated 4/4/2007, stamped by Marc S. D'Urso, P.E., Berkshire Design Group, Inc. c. Stormwater Drainage Report for Musante Drive (South), dated 6/7/2007, stamped by Mark B. Darnold, P.E., Berkshire Design Group, Inc. d. Additional Test Pits (104 & 105), dated 6/13/2007, performed and submitted by Marc S. D'Urso, P.E., Berkshire Design Group, Inc. e. Revised Stormwater Drainage Calculations, dated 6/12/2007, stamped by Mark B. Darnold, P.E., Berkshire Design Group, Inc. 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 durinir_a_ll phases_of construction. _ ___________ __ _ _ _ 3. At the completion of the work, including construction of stormwater management facilities and landscaping, the applicant shall submit a statement to the DPW 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 the certification statement described above. 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 15Y of each year. 5. If construction of the proposed stormwater 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 issuance of a Building Permit, 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. This agreement shall be approved by the Northampton DPW and signed by the owner and the Mayor of Northampton. Section 22- E:\Stormwater Permits\Stormwater Permits\Permits_new applications\Village Hill (Phase 2).doc -Page 2 of 4 85 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 of Intent (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 prior to the start of construction and prior to issuance of a building permit. 3. The plans and specifications approved by this Permit include roadways and conceptual impervious surface areas for site development. During the Site Plan approval, 40R site approval, or any other permitting for each lot, the applicant must submit documentation to the Northampton DPW of the proposed drainage system for the site, the impervious surface footprint of the site, and a revised summary of impervious surface areas built, proposed, and available for future construction for the sub-watershed drainage area where the proposed lot development is taking place. At certain stages (to be agreed on by the applicant and the DPW) of the build-out of the lots, the applicant shall be required to submit revised drainage calculations that reflect the actual construction that has been completed and confirms the remaining capacity of the Detention Basins in each Sub- Watershed area. If the overall size of the impervious surface footprint proposed for each __._________~ub=water-shed-as-defined~i-n-_the-dranag~calcu-lati~ns-i~~r:~at~r=than-the-ar=ea~pe~fed-in__-__ __ __.____ _ _ ___ _the approved drainage calculations or if the_dranage system is changed in_a substantive _ _ _ way, the applicant shall be required to submit revised plans and drainage calculations and maybe required to submit a new application for a Northampton Stormwater Management Permit for the proposed site plan. 4. The Existing Conditions Plan Sheet 1.2 shows a Sediment Forebay in Detention Basin 1. The DPW has commented in the review of As-Built plans for this Detention Basin to the applicant that this forebay does not appear to be constructed. Due to the level of the permanent pond in the Detention Basin, it is apparent that the forebay would not function according to the original design. Prior to issuance of a building permit, the applicant shall design and construct a forebay that meets the approval of the DPW. The forebay will function to allow sediment to settle out and provide an efficient means to conduct routine maintenance to remove sediment from the basin without having to drain the entire basin. 5. Following the excavation of existing pavement for the construction of Musante Drive, the contractor must take steps to reduce compaction of the soils in the area of the proposed Water Quality Swales. The proposed Water Quality Swales must be constructed and stabilized prior to receiving drainage flows from the roadway and shall be fenced or otherwise protected during construction of the roadway to prevent heavy equipment from compacting the underlying soil and prevent sediment washing into the Swales. 6. All Stormwater systems shall be constructed as proposed and stabilized prior to receiving drainage flows. 7. Within 60 days of the issuance of this permit, the applicant shall submit a revised Musante Drive Plan and Profile, Sheet 5.3 specifying a clean out for each perforated pipe proposed in the Water Quality Swales at the opposite end to the proposed overflow inlets. E:\Stormwater Permits\Stormwater Permits\Permits_new applications\Village Hill (Phase 2).doc Page 3 of 4 8. The plans show a proposed Drainage Easement on Lot 13-A for proposed Detention Basin 3. Additional drainage easements may be necessary for the proposed Water Quality Swales on 38A-087. The Water Quality Swales shall be required to be maintained by the property owners and must be included in the Stormwater Operation, Maintenance, and Inspection Agreement as described above. The DPW must review and approve all proposed Drainage Easements prior to recording at the land records of the Registry of Deeds. 9. The proposed Stormwater Outfall shown on Drainage Outfall Plan & Profile, Sheet 5.6 specifies 1:1 slopes on the sides of the outfall structure as well as 2:1 slopes above the proposed headwall. The applicant shall modify the design as much as is feasible to reduce the pitch of these slopes per approval of the Northampton Conservation Commission and the DPW. 10. If the design of the proposed Stormwater Outfall changes during the Northampton Conservation Commission approval of Notice of Intent, the applicant shall submit the revised design to the DPW for approval as an amendment to this permit. 11. Within 60 days of the issuance of this permit, the applicant shall submit documentation that all structures in the proposed Stormwater collection system have been sized to adequately collect and convey runoff from the 25-year storm event. A b Signature o~`~City Engineer tDate~' ~ ~ !~~ cc. Planning Board c/o Office of Planning and Development Building Department Conservation Commission c/o Office of Planning and Development \\Smbl\engineering\Stormwater Permits\scormwater Permits\Permits_new applications\Village Hill (Phase 2).doc Page 4 of 4 _.