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REVISED Roundhouse_SPR Application_r1 Roundhouse Parking Lot Rehabilitation Project Northampton, Massachusetts Site Plan Review Application City of Northampton 210 Main Street Northampton, MA 01060 March 2021 Revised March 19, 2021 53 Southampton Road • Westfield, MA 01085-5308 • Tel 413.562.1600 www.tighebond.com N-0936-011 March 19, 2020 Ms. Carolyn Misch, AICP Northampton Planning Department City Hall 210 Main Street Northampton, MA 01060 Re: Site Plan Review Application – Major Project Roundhouse Parking Lot Rehabilitation Project Revised Documents Dear Carolyn: On behalf of the City of Northampton Department of Central Services, Tighe & Bond is pleased to provide two (2) copies of a Site Plan Review application supplement for the Northampton Roundhouse Parking Lot Rehabilitation Project. The supplement is being provided due to changes in the site plan and addition of trees throughout the lot. A revised narrative removing the “alternate site plan” and describing the tree planting approach have been included with this supplement. We look forward to meeting with you at your next public hearing to discuss this high-priority City project. If you have any questions, please contact me at (413) 875-1620 or ADFagnand@tighebond.com. Very truly yours, TIGHE & BOND, INC. Alexander D. Fagnand, PE, ENV SP Project Manager Enclosures Copy: David Pomerantz, City of Northampton J:\N\N0936 Northampton DPW\11 - Roundhouse Parking Lot\Permitting\SPR\SPR Cover Letter_r1-revisions.docx CONTENTS Table of Contents Tighe&Bond i Cover Letter Application for Site Plan Review Section 1 Introduction Section 2 Project Description 2.1 Project Site ...................................................................................2-1 2.1.1 General Description .............................................................. 2-1 2.1.2 Zoning ................................................................................ 2-1 2.1.3 Dimensional and Density Regulations ...................................... 2-1 2.1.4 Wetlands and Rare Species .................................................... 2-1 2.1.5 Historic Resources .................................................................. 2-2 2.2 Scope of Improvements ..................................................................2-2 2.3 Design Standards ...........................................................................2-3 2.3.1 Parking and Loading Space Standards (350-8.8) ........................ 2-3 2.3.2 Additional Standards for Over Five Spaces (350-8.9) .................. 2-4 Section 3 Site Plan Review Requirements 3.1 Protection of Adjoining Premises (350-11.6.A) ...................................3-1 3.2 Access and Traffic Impacts (350-11.6.B) ...........................................3-1 3.3 Character of the Site (350-11.6.C) ...................................................3-1 3.4 Municipal Resource Capacity (350-11.6.D) ........................................3-2 3.5 Technical Performance Standards (350-11.6.F) ..................................3-2 3.5.1 Curb Cuts (350-11.6.F(1)) ...................................................... 3-2 3.5.2 Pedestrian, Bicycle and Vehicular Movements (350-11.6.F(2)) ..... 3-2 3.5.3 Stormwater (350-11.6.F(3)).................................................... 3-2 3.5.4 Medical Marijuana Facilities & New Buildings (350-11.6.F(4)-(5)) . 3-2 Section 4 General Standards 4.1 General Standards (350-12.1) .........................................................4-1 4.2 Lighting (350-12.2) ........................................................................4-1 4.3 Significant Trees (350-12.3) ............................................................4-1 Appendices A Figures B Project Drawings C Photometric Plot D Zoning Permit Decision E Stormwater Management Report (less appendices) SECTION 1 Tighe&Bond Roundhouse Parking Lot Rehabilitation Project Site Plan Review Application 1-1 Section 1 Introduction The City of Northampton Department of Central Services (the Applicant) is seeking to rehabilitate and expand the Roundhouse Parking Lot in downtown Northampton. The parking lot was constructed over the site of the former Northampton Gas Works (NGW), which is a registered Disposal Site with the Massachusetts Department of Environmental Protection (DEP) due to long-term operation as a Manufactured Gas Plant (MGP). Operations at the site ceased in approximately 1951, but resulted in soil and groundwater contamination that is being actively managed through Activity Use Limitations (AULs) and a Partial Permanent Solution with Conditions (PSWC). Coordination between Tighe & Bond and the Licensed Site Professional (LSP) of record is ongoing to ensure proposed activities on the site comply with the restrictions in place. The existing condition of the lot is very poor, including deteriorated pavement, damaged or missing curbing, and failing drainage due to poor grades. Despite its poor overall condition, the Lot remains in high demand due to its proximity to Downtown Northampton and ease of access from the south. During the recent Phase 2 Pulaski Park Renovation, an Americans with Disabilities Act (ADA) compliant ramp structure was built to connect the Lot with the Park. This access was built primarily in an informal gravel parking area adjacent to the Lot where the tenants of the Roundhouse building had allocated parking spaces. These tenants have a right-by-deed to 22 spaces, which had to be redistributed into the parking lot during Phase 2 of the Pulaski Park project. To overcome this effective loss in parking, as part of the Parking Lot Rehabilitation Project (Project), the City of Northampton Central Services Department proposes to expand the existing parking area to the south. The expansion with allow for an increase of 21 parking stalls, nearly overcoming the loss of the informal parking area, and providing additional capacity to help meet existing demand. The rehabilitation will also include repaving the entire lot with curbing and island revisions, making improvements to stormwater management, installing new plantings, and providing new lighting. The project will also rebuild a portion of the Manhan Rail Trail connection along the south end of the Lot, shifted further south to accommodate the parking lot expansion. Improvements include both tree plantings and pollinator-friendly landscape plantings. A Site Locus Map, Priority Resource Figure and Orthophotograph for the Project site are provided in Appendix A as Figures 1-3 (respectively). Site plans, sealed by a Registered Professional Engineer, are provided in Appendix B. The Project will require a Site Plan Review as a “Major Project” under Section 350-11.3.E as requested by the City of Northampton Planning Department, due to the provision that more than ten new parking spaces are being created. A Zoning Permit application has been submitted to the building commissioner and a Stormwater Management Permit will be filed with the Northampton Department of Public Works. SECTION 2 Tighe&Bond Roundhouse Parking Lot Rehabilitation Project Site Plan Review Application 2-1 Section 2 Project Description 2.1 Project Site The Project is located off Old South Street, directly west of the Peter Pan Bus Terminal, in the City of Northampton, Massachusetts. The parcels (31D-167, 31D-246, and 31D- 256) comprising the “site” are owned by the City of Northampton and include approximately 3.0-acres of land. 2.1.1 General Description The site includes an existing parking lot and extends to include a portion of the existing City Hall Annex building. The existing parking lot is situated over the former Northampton Gas Works manufactured gas plant, which is classified as a Tier 1 site under the Massachusetts Contingency Plan (MCP) and subject to deed-recorded Activity Use Limitations and a Partial Permanent Solution with Conditions. The site is accessed from the east by Old South Street and abuts the City Hall Annex, the Roundhouse, and Pulaski Park to the north, an apartment complex to the west, and a Northampton Housing Authority property to the south. The limits and topography of the Project are depicted on the Project Drawings provided in Appendix B. 2.1.2 Zoning Based on a review of the City’s Zoning Map, the Project site is located in the Central Business (CB) District. 2.1.3 Dimensional and Density Regulations The dimensional and density regulations for the Project are located in Section 350 Attachment 9: Table of Use, Dimensional and Density Regulations for Central Business. The Use category for this project is “Commercial or public parking facility or the addition of 6 or more parking spaces.” There is no building or structure proposed on the site, only parking area and associated improvements. The applicable dimensions are: · Minimum Lot Size = 0 SF · Minimum Frontage/Width/Depth = 0 FT The site is abutted to the south by the back-lot line of several residentially zoned parcels. The Northampton Housing Authority parcel is one of these properties and shares the access driveway from Old South Street. Further west, the parking lot abuts residential properties with a significant natural wooded buffer. No waivers are being sought from the Northampton Planning Board at this time. 2.1.4 Wetlands and Rare Species A comprehensive analysis of environmental factors including wetlands, rare and endangered species, vernal pools, regulated floodplain, drinking water resources, areas of protected open space, and Areas of Critical Environmental Concern (ACEC) was Tighe&Bond Roundhouse Parking Lot Rehabilitation Project Site Plan Review Application 2-2 conducted based on available GIS data and field observations. Based on this analysis, there are no resource areas within 100 feet of the limit of work. Please refer to the Priority Resource Figure (Figure 2) in Appendix A for reference. 2.1.5 Historic Resources A portion of the Project Site has been listed as a historic district in the State and National Registry of Historic Places. The historic district, the Northampton Downtown Historic District, was designated a State and National historic district on May 17, 1976 for the area’s distinct architecture, commerce, performing arts, and religion. Property ID 31D-167-001 and 31D-259-001 fall within the Northampton Downtown Historic District. The proposed Project is not anticipated to impact the Northampton Downtown Historic District as construction is limited to the footprint of the existing parking lot within the historic district. Expansion of the parking lot will occur in the southern portion of the Project Site; however, the expansion is not located within the Northampton Downtown Historic District. Three existing buildings located adjacent to the Project Site have been identified as historic buildings under the Massachusetts Cultural Resource Information System. The three buildings, located at 3-5 Clark Ave, 73 Old South Street, and 67-69 Old South Street, fall outside of the work limits and are not anticipated to be impacted by the proposed Project. 2.2 Scope of Improvements The City, acting through its Department of Central Services, is proposing to rehabilitate and expand the Roundhouse Parking Lot. The existing lot is in poor condition, including deteriorated pavement and curbing, inadequate lighting, and poor drainage due to warped pavement and poor grades. In addition to the observable deficiencies in condition, this project became a priority for the City after the completion of Phase 2 of the Pulaski Park Renovation. Phase 2 included the development of a landscaped and terraced embankment that included an ADA compliant ramp connecting the parking lot with the Park, which is at a much higher elevation. To construct this embankment, an unmarked gravel parking area at the north end of the Roundhouse Lot was eliminated. The gravel area previously served the tenants of the Roundhouse building who have a deeded right to 22 parking spaces in the lot. To account for the loss of the gravel area, those spaces have been redistributed to the paved portions of the lot, reducing publicly available (and metered) parking stalls. To address these concerns, the City is proposing full depth pavement reclamation, new curbed islands with trees and pollinator plantings, new lighting, drainage system improvements, and a minor expansion of the lot to the south on lands acquired by the City for this purpose. The project will also provide infrastructure for future Electric Vehicle (EV) charging stations. The Roundhouse Lot was originally constructed as a cap over the contaminated soils resulting from long-term operation of the Northampton Gas Works facility. The lot was originally paved to the base course and the pavement was too thin for long-term use and is now in need of rehabilitation. The pavement has also been disturbed numerous times for additional utility and remediation work, further damaging the parking lot surface. These remediation activities included installation of a subsurface geomarker, installation of monitoring wells, excavation of test pits, and drilling of soil borings to indicate the depth at which contamination is present. The size of the lot is a byproduct of the available space more so than any study or review of demand, but the lot has always been a popular spot to park for downtown visitors and employees, frequently Tighe&Bond Roundhouse Parking Lot Rehabilitation Project Site Plan Review Application 2-3 reaching full capacity. The completed Pulaski Park improvements add even more appeal to using the Roundhouse lot for parking needs and more direct access to Main Street. Accordingly, one of the project goals is to increase the number of available parking stalls to the extent practicable to help serve the existing downtown Northampton parking demand. The proposed site plan will increase parking stalls by 21. In addition to rehabilitation and the increase in parking capacity, safety improvements are proposed for all users. Due to limited available space, the lot has always been difficult to maneuver for motor vehicles and some sight lines are constrained. The proposed layout includes one-way traffic circulation along the north and western-most drive aisles to reduce vehicle conflict points and promote a more predictable traffic circulation pattern for all users. The bike path will also generally maintain its route, but the alignment will be shifted further south. The path will have a two-foot marked buffer where it is adjacent to parking stalls or drive aisles and will be more clearly marked near the Old South Street entrance. A shared path and drive aisle at the western end of the parking lot will also allow for connection from the path to the ramp structure at the Park for a more direct bike connection to Main Street. Proposed lighting, designed to current Dark Sky standards, will also provide a safety improvement for all users and reduce any light spill nuisances to adjacent residential buildings. The lighting will improve visibility for cyclists, pedestrians, and motor vehicles operating in the parking lot. Stormwater improvements in the lot will include improved grading to promote positive drainage to the inlet locations and stormwater treatment units to improve the water quality of stormwater leaving the site. The options at the Roundhouse Lot are limited due to the subsurface contamination present, so more traditional infiltration and detention techniques are not plausible on the site. The stormwater approach has been reviewed with the City’s Stormwater Coordination and Engineer and a stormwater permit application will be filed with the Northampton Department of Public Works (DPW) concurrent with this application. 2.3 Design Standards The proposed improvements were prepared in accordance with the parking and landscape standards set forth in Section 350-8.8 and Section 350-8.9 to the extent practicable. Applicable standards are discussed in this section. In general, the parking lot rehabilitation is limited by existing constraints including existing drainage and power utility locations, and the underlying soil contamination. 2.3.1 Parking and Loading Space Standards (350-8.8) · All proposed parking stalls are at least 8.5 feet wide and 18 feet deep with an 18- foot drive aisle. · Snow storage will be addressed during normal storms by plowing to the south end of the lot, just beyond the bike path. In larger storm events, snow will be temporarily managed within the parking stalls on the south end of the lot until it can be removed from the lot by loader and dump truck. · Lighting will comply with the standards set forth in Section 12.2. · The parking lot will be served by the existing curb cut. · Drainage will be pitched to existing collection points and contained on the site. Tighe&Bond Roundhouse Parking Lot Rehabilitation Project Site Plan Review Application 2-4 · A Zoning Permit has been filed with the Building Commissioner. 2.3.2 Additional Standards for Over Five Spaces (350-8.9) · The existing natural buffer to the south of the parking lot will remain substantially intact. · The parking lot will be constructed with bituminous concrete pavement and have clearly marked parking stalls. · Perimeter curbing is not included on the south or west edges of the parking lot to match existing conditions and limit the amount of grading required on the site. · The parking rows will be broken by planting strips; however, no integral sidewalks are proposed in the strips. · The parking count requires 13 shade trees based on total spaces. 15 existing shade trees will remain on the parking lot. In addition, 30 new trees will be planted within the lot to offset for the loss of several significant trees. These additional trees will provide canopy and shading within the lot (see Section 4.3 for further discussion). SECTION 3 Tighe&Bond Roundhouse Parking Lot Rehabilitation Project Site Plan Review Application 3-1 Section 3 Site Plan Review Requirements This application has been prepared in response to the Site Plan Approval requirements of Section 350-11 Site Plan Approval and is being filed as a Major Project under the provisions of 350-11.3. The application includes a narrative discussion of how the proposed Project complies with the Approval Criteria established in Section 350-11.6. The General Performance Standards are discussed in Section 4. 3.1 Protection of Adjoining Premises (350-11.6.A) The Project includes rehabilitation of the existing parking lot with a minor expansion of the parking area to the south. The proposed use will be consistent with existing activity on the site. Parking lot grades will be constructed so that existing drainage patterns are generally maintained, and drainage more effectively reaches catch basin inlets in the lot. In addition, proposed lighting will be designed to City standards, with no light trespass onto adjoining private parcels. 3.2 Access and Traffic Impacts (350-11.6.B) The Project will maintain the existing driveway access from Old South Street, including restriping and curb line improvements for better definition at the entry. The bike path will also be more clearly delineated at the driveway entrance including a buffer to the motor vehicle travel lanes and bike lane markings. The introduction of 37 new parking spaces will help additional downtown visitors and employees find parking in the lot. This should result in less vehicle trips circulating through downtown parking lots looking for parking during peak times. Internal to the lot, the proposed improvements should also help maneuverability and circulation in the lot, promoting safer access for all users. New pavement markings and signage will guide parking lot users through the lot and reduce the number of conflict points in the parking lot. The additional parking is being proposed in response to existing demand and the loss of the unmarked area on the north side of the lot. No new traffic will be generated by the project. 3.3 Character of the Site (350-11.6.C) While the project will include a minor expansion of the existing parking lot, the use will remain unchanged. The site should continue to function comparably to its current operation and not impose any new burden or impediment on the adjacent areas. Landscape improvements including new lighting and pollinator plantings in the islands will help to break up the pavement area and extend the landscape of the renovated Pulaski Park through the parking lot generally improving the aesthetics and natural functions of the space. No changes are proposed to the adjacent buildings or structures. Tighe&Bond Roundhouse Parking Lot Rehabilitation Project Site Plan Review Application 3-2 3.4 Municipal Resource Capacity (350-11.6.D) The Project does not impact municipal resources and will not create new demands on existing utilities or roadways. The additional parking is being proposed to address an existing need and is not anticipated to generate new traffic to the parking lot. Additional stormwater runoff from the new parking area will be managed in accordance with City of Northampton Stormwater Standards through a Stormwater Permit. 3.5 Technical Performance Standards (350-11.6.F) 3.5.1 Curb Cuts (350-11.6.F(1)) The existing curb cut to Old South Street will be maintained. This curb cut is used in common with the Housing Authority property, the Peter Pan Bus Terminal, and the Site. 3.5.2 Pedestrian, Bicycle and Vehicular Movements (350-11.6.F(2)) The Project includes several safety improvements for all parking lot users, while maintaining and enhancing the existing bike path route through the lot. Pedestrians exiting their cars do not have sidewalks within the parking lot but have ADA compliant ramps and walkways to the north, south, and east sides of the lot. In addition, circulation improvements for motor vehicles will lead to more predictable movements and better sight lines, benefitting all users. ADA parking has been distributed throughout the lot provided adjacent to the Pulaski Park access, the Roundhouse Building, and the bus terminal to minimize the distance users need to travel to a sidewalk or destination. The total number of ADA stalls and van accessible stalls complies with the Massachusetts Architectural Access Board (MAAB) requirements (521 CMR 23.00). In addition, a dual port Electric Vehicle (EV) charging station is proposed in the lot. 3.5.2.1 Sidewalk Width (350-11.6.F(2)(a)-(b)) No new sidewalks are proposed with the Project. 3.5.2.2 ADA Ramps (350-11.6.F(2)(c)) ADA compliant ramps are proposed at the west end of the Pulaski Park access to support the bike path connection and at the east end of the project near the bus terminal access to promote a through route. The bike path, which is available for pedestrian use, is at grade and does not require a ramp. 3.5.2.3 Sidewalk at Driveway (350-11.6.F(2)(d)-(f)) No changes are proposed to the curb cut. The existing crosswalk will be maintained at the entrance. 3.5.3 Stormwater (350-11.6.F(3)) The Project is a Major Project but is located in the Central Business district. A stormwater permit application will be filed with DPW. 3.5.4 Medical Marijuana Facilities & New Buildings (350-11.6.F(4)-(5)) Not applicable to the proposed Project. SECTION 4 Tighe&Bond Roundhouse Parking Lot Rehabilitation Project Site Plan Review Application 4-1 Section 4 General Standards Section 4 discusses the project’s compliance with the General Performance Standards set forth in 350-12.1. 4.1 General Standards (350-12.1) The existing site use will not be changed by this project. The parking lot is believed to be in conformance with the General Standards set forth in the Bylaw and there are no known violations of the General Standards, including: 1. Effective confinement of emissions 2. Improper storage of flammable and explosive materials 3. Release of emissions that can cause damage or irritation to public health 4. Illicit discharges of waste to the ground or waterways or accumulations of waste or debris 5. No emission of odorous gases or odoriferous matter 6. No emission of radioactive materials 7. No generation of electrical disturbances 8. No persistently loud or disruptive noise. The site contractor awarded the construction contract will be required to develop and submit the Engineer for approval a Health and Safety Plan to address the known subsurface conditions at the site. Construction monitoring will occur by both Engineering staff and Licensed Site Professionals to ensure the contractors operations are in accordance with the Health and Safety Plan, the deed restrictions on the parcels, and the Massachusetts Contingency Plan. 4.2 Lighting (350-12.2) A new lighting system is proposed for the parking lot in accordance with the lighting standards set forth in this section. The proposed lights will be comparable to those installed in Pulaski Park and help to extend the established landscape and aesthetic into the parking lot. Proposed fixtures will be Dark Sky compliant with full cut-offs. A photometric plot will be provided for the Board’s consideration. 4.3 Significant Trees (350-12.3) The project will include removal of four significant trees in the clearing and grubbing area to the south of the existing lot. These trees include a 24-inch Norway Maple, a 24- inch and a 29-inch Yellow Poplar, and a 24-inch Elm tree totaling 101-inches DBH of removal. Per 350-12.3.E(1)(a), 51-inches of tree replacement is required to mitigate for Tighe&Bond Roundhouse Parking Lot Rehabilitation Project Site Plan Review Application 4-2 this impact. Additional mature trees will also be removed in the clearing and grubbing area as will invasive vines, dead and broken trees, and litter and debris. The landscape plan for the parking lot includes thirty new 2.5-inch caliper tree plantings within the parking lot. These new plantings account for 75 inches of replacement caliper. The tree species were selected from the City’s tree list, as provided by the Tree Warden. After consultation with the Licensed Site Professional of Record for the site, all of the trees were located on the southern parcel of the Roundhouse lot due to the presence of the subsurface barrier (overlaying contaminated soils) on the northern parcel. The remaining splitter islands on the northern parcel will be planted with native pollinator species plants in partnership with Local Harmony and Western Mass Pollinator Networks. The planting arrangement will have a shallower root system, while still providing a significant ecological benefit to the northern parcel of the parking lot. The linear nature of the splitter islands, and their north-south alignment, will help create a wildlife connection between the Pulaski Park planting areas and the naturalized area south of the Roundhouse Lot. The pollinator plantings will also act as an extension of adjacent planting areas in the Park and along Crafts Avenue. APPENDIX A Based on U SGS Topo graphic Map forEasthampton, MA Revised 1979. Contour Eq uals 10-feet. [S ite Quad]Mt Holyoke, MA Revised 1979. Contour Eq uals10-feet.Circles indicate 500-foo t and half-mile rad ii 0 1,000 2,000 Feet 1:24,000 V:\P rojects\N\N0936\Roundhouse_NorthamptonMA\MXD\Roundhouse_NorthamptonMA_Topo.mxd [Exported By: kjw, 1/25/2021, 3:11:36 PM] FIGURE 1SITE LOCATION Roundhouse Parking LotRehabilitation ProjectNorthampton, Massachusetts January 2021 N-0936 ^_ ¹ÈSITE LOCATION Tighe&Bond Legend Limit of Wo rk # #!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!! ! ! ! !!!! ! ! ! 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FIGURE 2PRIORITY RESOURCES Roundhouse Parking LotRehabilitation ProjectNorthampton, Massachusetts N-0936 January 2021 ^_ L e g e n dXNHESP Certified Vernal PoolsXNHESP Potential Vernal Pools #Non-Landfill Solid Waste Sites !Þ Proposed Well !Þ Emergency Surface Water !Þ Community Public Water Supply - Surface Water !Þ Community Public Water Supply - Groundwater "Non-Community Non-Transient Public Water Supply "T Non-Community Tr ansient Public Water Supply Limited Access Highway Multi-Lane Highway, NOT Limited Access Other Numbered Highway Major Road - Collector Minor Street or Road Aquaducts Hydrologic Connections Stream/Intermittent Stream !Powerline Pipeline Track or Trail Trains Public Surface Water Supply Protection Area (Zone A) DEP Approved Wellhead Protection Area (Zone I) DEP Approved Wellhead Protection Area (Zone II) DEP Interim Wellhead Protection Area (IWPA) Protected and Recreational Open Space Solid Waste Landfill Area of Critical Environmental Concern (ACEC) NHESP Priority Habitats for Rare Species NHESP Estimated Habitats for Rare Wildlife EPA Designated Sole Source Aquifer Major Drainage Basin Sub Drainage Basin MassDEP Open Water MassDEP Inland Wetlands MassDEP Coastal Wetlands MassDEP Not Interpreted Wetlands Public Surface Water Supply (PSWS) Water Bodies Non-Potential Drinking Water Source Area - High Yield Non-Potential Drinking Water Source Area - Medium Yield Potentially Productive Medium Yield Aquifer Potentially Productive High Yield Aquifer County Boundary Town Boundary USGS Quadrangle Sheet Boundary Limit of Work 1:24,000 ¹ÈSITE LOCATION Tighe&B ond MASONIC STREETSOUTH STREETW ESTSTREETELM ST R E E TM A IN S TREETS E E L Y EDRIVECONZ STREETOLDSOUTHSTREET FORT HILL TERRACESTATESTREETB R E W S T E R C O U R T KIRKLAND AVENUEWILSON AVENUEDEWEY COURT B U T T O N S T R E E T H A M P TO N A V E N U E M APLE AVENUEROUNDHOUSEPLAZACRAFTSAVENUES C HOOL STREET FRUIT STREET C L A R K AV E N U E UV66 UV10 UV9 FIGURE 3ORTHOPHOTOGRAPH Roundhouse Parking LotRehabilitation ProjectNorthampton, Massachusetts¹0 100 200 Feet 1:2,400 V:\P rojects\N\N0936\Roundhouse_NorthamptonMA\MXD\Roundhouse_NorthamptonMA_Aerial.mxd [Exported By: kjw, 1/25/2021, 3:11:13 PM] Based on M assGIS Color Orthop hotog rap hy (2019) N-0936 January 2021 ^_ Legend Limit of Wo rk ÈSITE LOCATION Tighe&Bond APPENDIX B [Site Plans provided under separate cover] APPENDIX C Calculation SummaryLabelAvg - FCMax - FCMin - FCAvg/MinMax/MinROUNDHOUSE LOT @ GRADE1.242.20.0N.A.N.A.Luminaire ScheduleQtyLabelWattageLuminaire LumensLLFDescription17SL181.366850.900LUMEC MPTR-80W48LED3K-G2-LE5-VOLT-DMG-FN10-COLTX Mounted to RTA800F-16-COLTX w/Optical Center @ ~18ft AFG5SL254.444220.900LUMEC MPTR-55W48LED3K-G2-LE3W-VOLT-DMG-FN10-COLTX Mounted to RTA800F-16-COLTX w/Optical Center @ ~18ft AFGJOB NAME: ROUNDHOUSE LOT - NORTHAMPTON, MADATE: 3/18/2021APEX LIGHTING SOLUTIONSREFLECTANCES: NONE USEDWORKPLANE: @ GRADEOLD SOUTH STREETNEW SOUTH STREET - RTE 10ROUNDHOUSE 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point where all ascending lines convergeSOLUTIONSSCALE : DATE:DRAWN BY:SHEET:SL-1C1"=20'-0"3/18/2021DCSome differences between measured values and calculated results may occur due toNOTE TO REVIEWER:Total Light Loss Factor (LLF) applied at time of design is determined by applyingthe Lamp Lumen Depreciation (LLD) from current lamp manufacturer's catalog,a Luminaire Dirt Depreciation Factor (LDD) based on IES recommended values anda Ballast Factor (BF) from current ballast specification sheets. Application of anincorrect Light Loss Factor (LLF) will result in forecasts of performance that will not accurately depict actual results.input data, differences will occur between measured values and calculated values.the lighting calculations. If the real environment conditions do not match thedimensions, reflectances, furniture and architectural elements significantly affectvariations. Input data used to generate the attached calculations such as roommeasurement techniques and field conditions such as voltage and temperaturetolerances in calculation methods, testing procedures, component performance,* LLF Determined Using Current Published Lamp DataFor proper comparison of photometric layouts, it is essential that you insist all designers use correct Light Loss Factors.GENERAL DISCLAIMER:Calculations have been performed according to IES standards and good practiceDRAWING TITLE:PROJECT TITLE:ROUNDHOUSE LOTNORTHAMPTON, MASITE LIGHTING POINT CALCULATIONCONNECTICUTMASSACHUSETTSRHODE ISLANDMAINENEW HAMPSHIREVERMONTPHONE: 877-886-2843 FAX: 877-886-2844www.apexltg.com APPENDIX D [Zoning permit decision not received at time of filing] APPENDIX D APPENDIX E Roundhouse Parking Lot Rehabilitation Project Northampton, Massachusetts Stormwater Management Report Prepared for: City of Northampton 210 Main Street Northampton , MA 01 060 March 2021 53 Southampton Road • Westfield, MA 01085-5308 • Tel 413.562.1600 www.tighebond.com N-0936-011 March 18, 2021 Doug McDonald Stormwater Manager Northampton Department of Public Works 125 Locust Street Northampton, MA 01060 Re: Stormwater Management Permit Application Roundhouse Parking Lot Rehabilitation Project Dear Doug: On behalf of the Department of Central Services, Tighe & Bond is pleased to provide one copy of a Stormwater Management Permit application for the Roundhouse Parking Lot Rehabilitation Project accessed from Old South Street in Northampton, Massachusetts. Electronic Copy has also been provided for review. The Roundhouse Parking Lot is a heavily used parking venue for downtown Northampton visitors and employees and is frequently at full capacity throughout the day. The existing lot is in poor condition and in need of rehabilitation. In addition, with the completion of Phase 2 of the Pulaski Park project, an informal parking area on the north side of the lot was redeveloped as a park access. This area previously accommodated the parking demands of the Roundhouse building tenants, who have right-by-deed to 22 parking spaces in the lot. Those spaces are now distributed throughout the parking lot, effectively reducing capacity of the lot. The proposed rehabilitation is intended to improve the conditions in the lot, while also expanding the parking capacity to overcome the loss of the informal parking area. In addition to the minor expansion of parking, the project will include new lighting and plantings as well as modifications to the existing stormwater system. As part of our application, we are requesting a waiver from the Peak Rate Attenuation requirement based on the project’s location within the Central Business district. We are also requesting relief from the groundwater recharge requirement as the site is fully underlain by contaminated soils and infiltration is not an advisable practice. We look forward to working with you as you review the enclosed Stormwater Management Permit Application. If you have any questions, please contact me at (413) 875-1620 or ADFagnand@tighebond.com. Very truly yours, TIGHE & BOND, INC. Alex Fagnand, PE, ENV SP Project Manager Enclosures Copy: David Pomerantz, City of Northampton J:\N\N0936 Northampton DPW\11 - Roundhouse Parking Lot\Permitting\Stormwater\Stormwater Report\Cover Letter.Docx 1. Project / Site Information Project / Site Name: Roundhouse Parking Lot Rehabilitation Project Project Street / Location: Off Old South Street Assessor’s Map: 31D Parcel(s): 167; 246; 256 Estimated Area to be Disturbed (ft2): 95,750 sf Total Area of Impervious Surfaces: Existing Proposed (paved, parking, decks, roofs, etc.) (ft2) 115,850 sf 116,875 sf Project Type (check one) Permit Review and Inspection Fee  Residential Site (1 unit and 1-5 Acres Disturbed) $700  Residential Site (1 unit and greater than 5 Acres Disturbed) $1,100  Minor Residential Subdivision (1 lot and disturbing 1 to 5 acres of land) $700 or $1 per linear foot of roadway or common driveway (whichever is greater)  Residential Subdivision and Other Residential such as Townhouse or Retirement Development (2 or more units in a common plan of development) $2000 or $2 per linear foot of roadway or common driveway (whichever is greater)  Commercial Subdivision $2000 or $2 per linear foot of roadway or common driveway (whichever is greater)  Commercial or Industrial Site $700 per acre disturbed (maximum of $5,000)  Land Disturbance Only (No change in site use or buildings. May include reconstruction of parking lots, roads, and driveways; utility work; and lawn and landscaping work.) $100 per acre disturbed 2. Applicant Information 3. Owner Information (if different from Applicant) Name: City of Northampton; David Pomerantz Address: 240 Main Street, Northampton Telephone: (413) 587-1238 E-Mail: dpomerantz@northamptonma.gov Fax: (413) 587-1248 4. Certification I herby certify that the information contained herein including all attachments is true, accurate and complete to the best of my knowledge. Further, I grant the Northampton Department of Public Works and its agents’ permission to enter the property to review this application and make inspections during and after construction. Applicant’s Signature Date Owner’s Signature Date STORMWATER MANAGEMENT PERMIT APPLICATION Fee Paid: Date Paid: Permit #: Approved By: Approval Date: (For DPW use only) City of Northampton Department of Public Works Northampton Department of Public Works Page 2 Stormwater Management Permit 5. Application Requirements The application to the Northampton Department of Public Works (DPW) for a Stormwater Management Permit must include submission of the following:  Completed and Signed Stormwater Management Permit Application  Non-Refundable Permit Review and Inspection Fee (made out to City of Northampton)  Stormwater Report as defined by the MA DEP 4/01/08 Stormwater Report Checklist  Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan  Three complete copies of the Stormwater Report and Erosion and Sedimentation Control Plan or SWPPP prepared by a professional engineer licensed by the Commonwealth of Massachusetts, and including the minimum documentation listed below (see the Northampton Stormwater Management Ordinance (Chapter 281) for more information): Project Documentation: (Check circles below indicating that you have provided the following minimum information)  Identify all operators for the project site and the potions over which each operator has control.  All plans submitted have been prepared and stamped by a professional engineer licensed by the Commonwealth of Massachusetts  The applicant has certified on the drawings that all clearing, grading, drainage, construction, and development shall be conducted in strict accordance with the plan  Locus map  The existing zoning, and land use at the site  The proposed land use  The location of existing and proposed easements  The location of existing and proposed utilities  The site’s existing & proposed topography with contours at 2 foot intervals  Soils investigation (by a Certified Soil Evaluator or Certified Professional Soil Scientist) including borings or test pits, to a depth greater than 4 ft. below estimated seasonal ground water for areas where construction of infiltration practices will occur.  Estimated seasonal high groundwater elevation (November to April) in areas to be used for storm water retention, detention, or infiltration (by a Certified Soil Evaluator or Certified Professional Soil Scientist).  A description & delineation of existing stormwater conveyances, impoundments, and wetlands on or adjacent to the site or into which storm water flows.  A delineation of 100-year flood plains, if applicable.  The existing and proposed vegetation and ground surfaces with runoff coefficient for each.  A drainage area map showing pre and post construction watershed boundaries, drainage area, storm water flow paths, and receiving water.  A description and drawings of all components of the proposed drainage system including: 1) the structural details for all components of the proposed drainage systems and storm water management facilities (including size, inverts, and grade); 2) all measures for the detention, retention or infiltration of water; 3) all measures for the protection of water quality; 4) notes on drawings specifying materials to be used, construction specifications, and typicals; 5) the existing and proposed site hydrology with supporting drainage calculations (including the 1,2,10, and 100 year NRCS design storms); Northampton Department of Public Works Page 3 Stormwater Management Permit 6) proposed improvements including location of buildings or other structures, impervious surfaces, and drainage facilities, if applicable; 7) location, cross sections, and profiles of all potentially impacted brooks, streams, drainage swales and their method of stabilization; and 8) proposed ownership of drainage system structures.  Estimate of the total area expected to be disturbed by excavation, grading or other construction activities.  A description and location of all measures (i.e., Best Management Practices) that will be implemented as part of the construction activity to control pollutants in storm water discharges. A description of when each control measure will be implemented in the construction schedule, which operator is responsible for the implementation of each control measure and a maintenance and inspection schedule for each control measure during construction.  A description of construction and waste materials expected to be stored on-site, and a description of controls to reduce pollutants from these materials including storage practices to minimize exposure of the materials to storm water, and spill prevention and response.  Timing, schedules, and sequence of development including clearing, stripping, rough grading, construction, final grading, and vegetative stabilization. 6. Application Submission, Review, and Approval Procedures 1. Application Submittal: The application to the Northampton DPW for a Stormwater Management Permit must be submitted prior to or concurrently with any land use permit application. Submission of an application should be made to the Northampton Department of Public Works, 125 Locust St., Northampton, MA 01060. For more information and copies of the Northampton Stormwater Ordinance visit the DPW web site at http://www.northamptonma.gov/dpw/Stormwater/ or contact Doug McDonald at 413-587-1582 or dmcdonald@northamptonma.gov 2. Administrative Review: The Northampton DPW will have 7 days from the receipt of the application to review the application for administrative completeness. Incomplete applications will be disapproved and returned to the applicant based on the determination that they are administratively incomplete. 3. Review: If the application is found to be complete, the Northampton DPW will review the application and supporting documents based on the criteria set forth in the Northampton Stormwater Management Ordinance (Chapter 281) and will take final action within 21 days (including the 7 day administrative review period) of the receipt of a complete application unless such time is extended by agreement between the applicant and the DPW. 4. Final Action: The Northampton DPW’s final action will be in writing and will be sent to the applicant and the appropriate City Department(s) and Board(s). Table of Contents Tighe&Bond i Cover Letter City of Northampton Stormwater Management Permit Section 1 Registered Professional Engineer's Certification Section 2 Project Description 2.1 Project Introduction ........................................................................2-1 2.2 Existing Conditions .........................................................................2-1 2.3 Floodplain Management ..................................................................2-2 2.4 Proposed Improvements .................................................................2-2 2.4 Hydrologic Analysis ........................................................................2-3 Section 3 Regulatory Compliance 3.1 LID Measures.................................................................................3-4 3.2 Standard 1: No New Untreated Discharges ........................................3-4 3.3 Standard 2: Peak Discharge Rate Attenuation ....................................3-4 3.4 Standard 3: Groundwater Recharge ..................................................3-5 3.5 Standard 4: Water Quality ...............................................................3-5 3.6 Standard 5: Land Uses with Higher Potential Pollutant Loads (LUHPPLs) 3-6 3.7 Standard 6: Critical Areas ...............................................................3-6 3.8 Standard 7: Redevelopment Projects ................................................3-6 3.9 Standard 8: Construction Period Pollution Prevention, Erosion and Sedimentation Control ....................................................................3-6 3.10 Standard 9: Long-Term Operation and Maintenance Plan ....................3-7 3.11 Standard 10: Prohibition of Illicit Discharges ......................................3-7 3.12 Local Stormwater Management Regulations .......................................3-7 Table of Contents Tighe&Bond ii Appendices A Massachusetts Stormwater Checklist B Figures Figure 1: Site Location Map Figure 2: Priority Resource Map Figure 3: Orthophotograph Figure 4: Existing Conditions Drainage Area Map Figure 5: Proposed Conditions Drainage Area Map Figure 6: Flood Insurance Rate Map for the City of Northampton C NRCS Soils Information D Stormwater Calculations E Erosion and Sediment Control Plan F Long-Term Pollution Prevention and Stormwater Operation & Maintenance Plan G Illicit Discharge Statement Figures 1 Site Location Map 2 Priority Resource Map 3 Orthophotograph 4 Existing Conditions Drainage Area Map 5 Proposed Conditions Drainage Area Map 6 Flood Insurance Rate Map for the City of Northampton Tables 2.1 Soil Descriptions 2.2 Design Rainfall Depths 3.1 Peak Discharge Rate Comparison \\Tighebond.com\data\Data\Projects\N\N0936 Northampton DPW\11 - Roundhouse Parking Lot\Permitting\Stormwater\Stormwater Report\Narrative\Stormwater Report Narrative.docx SECTION 1 SECTION 2 Tighe&Bond Roundhouse Parking Lot Rehabilitation Project Stormwater Management Report 2-1 Section 2 Project Description 2.1 Project Introduction On behalf of the City of Northampton (the “Applicant”), Tighe & Bond has prepared the following Stormwater Management Report to support local permitting efforts for the Roundhouse Parking Lot Rehabilitation Project located off Old South Street in Northampton, Massachusetts. The proposed project includes full depth reclamation of the existing Roundhouse Parking Lot, expansion of the parking lot to the south, and reconstruction of the Manhan Rail Trail between the Route 10 underpass and Old South Street. The project will improve stormwater capture by improving grades and surface conditions in the lot, and also improve stormwater quality with the addition of two stormwater treatment units added online to the existing site drainage system. A Site Location Map figure, Priority Resource figure, and Orthophotograph of the Project site are provided in Appendix B as Figures 1-3 (respectively). Project plans are provided separately. 2.2 Existing Conditions The Natural Resources Conservation Service (NRCS) soil data was obtained through the Web Soil Survey portal on the United States Department of Agriculture (USDA) NRCS website. The areas including and surrounding the property were queried for soil types according to the record soil survey maps maintained by NRCS. Soils within the project area, as published in the USDA Soil Survey for Hampshire County, Version 15, dated June 9, 2020, include the Amostown, Amostown-Windsor and Hadley-Winooski associations, as well as Urban Land. The NRCS Soils Mapping is provided in Appendix C. The hydrologic soil group (HSG) and further description for each soil association is presented in Table 2.1 below. Table 2.1 Soil Descriptions Soil Map Designation Soil Name Hydrologic Soil Group (HSG) 258A Amostown fine sandy loam, 0 to 3 percecnt slopes B 741A Amostown-Windsor silty substratum- Urban land complex, 0 to 3 percent slopes NA1 744A Hadley-Winooski-Urban land complex, 0 to 3 percent slopes B 1 For hydrologic analysis, HSG B was used based on hydrologic group data published in the NRCS RUSLE2 Related Attributes table. Section 2 Regulatory Compliance Tighe&Bond Roundhouse Parking Lot Rehabilitation Project Stormwater Management Report 2-2 The hydrologic soil group designation (HSG) for this soil type is listed as B. The HSG rating for soil types is based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long duration storms. Soils designated as HSG B generally have a moderate infiltration capacity and are well drained despite their finer texture. The parking lot overlays parcels formerly housing the Northampton Gas Works and a Railroad. Upon the donation of the properties to the City of Northampton, environmental site assessments confirmed the presence of soil contamination on the parcels and several surrounding parcels. Cleanup and containment of the contaminants is an ongoing process with an Activity Use Limitation placed on the Roundhouse Parking Lot parcels in 2015. A subsurface soil barrier was installed beneath a portion of the Roundhouse Parking lot to protect against migration of the soil contamination. Under existing conditions, stormwater runoff from the project area flows into catch basins and discharges to the city drainage system. The existing catch basins were installed prior to the requirement for deep sumps and hoods. Additionally, no treatment is provided in the existing drainage system prior to discharge to the municipal system. The only recharge provided is when stormwater leaves the site such as the existing wooded area to the south of the site. The runoff curve numbers (RCN) used in the calculation of the composite RCN for each drainage area are based on the values provided in TR-55, Urban Hydrology for Small Watersheds. RCN values vary depending on the type of ground cover and soil HSG. A summary of the existing conditions runoff curve numbers is provided in Appendix D. Existing Conditions Drainage Areas were delineated based on topography and stormwater discharge location. An Existing Conditions Drainage Area Map is provided as Figure 4 in Appendix B. 2.3 Floodplain Management The Federal Emergency Management Agency’s (FEMA) Flood Insurance Rate Map (FIRM) Community Panel Number 250167 0002 A, effective April 3, 1978 shows the project site outside of any floodways or floodplains, as attached in Appendix B. Therefore, no floodplain is identified on this site. 2.4 Proposed Improvements The proposed site development involves full depth reclamation of the existing Roundhouse parking lot, expansion of the parking lot to the south, and reconstruction of the Manhan Rail Trail from the Route 10 underpass to Old South Street. This design has been prepared in accordance with recommendations in the Massachusetts Department of Environmental Protection (MassDEP) Stormwater Handbook. Under proposed conditions, stormwater runoff from the project area follows existing flow paths to collection in existing catch basins. Treatment for the majority of the parking lot will be provided in hydrodynamic separators prior to discharge to the city drainage system. A small portion of the grassed and wooded areas immediately south of the Manhan Rail Section 2 Regulatory Compliance Tighe&Bond Roundhouse Parking Lot Rehabilitation Project Stormwater Management Report 2-3 Trail sheet flows to the south and into an existing depression where stormwater can infiltrate. This pattern matches existing drainage conditions. A summary of the proposed conditions runoff curve numbers is provided in Appendix D. Proposed conditions drainage areas were delineated based on topography and stormwater discharge location. A Proposed Conditions Drainage Area Map is provided as Figure 5 in Appendix B. The proposed stormwater management system treats the quality of stormwater discharge from the site. The system includes existing catch basins and introduction of a best management practice (BMP) – proprietary stormwater treatment units. Due to the presence of contaminated soils within the site, a waiver is requested from the recharge requirements. Similarly, a waiver is requested from the peak rate attenuation requirement based upon the site location within the Central Business District and the impracticality of peak rate attenuation on a contaminated site. A brief description of the proposed Best Management Practices incorporated into the stormwater management system are as follows: Catch Basins: Existing catch basins provided throughout the site collect stormwater runoff from the proposed parking areas and are connected to the project’s stormwater collection system. These existing structures are being reused to minimize disturbance to a highly contaminated site. Proprietary Treatment Devices: Structural stormwater treatment devices, proposed as Contech Cascade CS-4, are designed to mechanically separate pollutants from stormwater flows through centrifugal force and vortex separation. Units are proposed at the downstream runs of the existing stormwater management system in the main portion of the parking lot prior to discharging into the city drainage system. Each unit has been sized in accordance with guidance provided by MassDEP to insure proper sediment removal efficiencies. 2.4 Hydrologic Analysis A hydrologic analysis of the pre-development and post-development site was performed to determine the impacts of the proposed project to peak discharge rates and stormwater runoff volumes. HydroCAD Release 10.00-20 is a hydrology and hydraulics software using Technical Release (TR) 20 and TR-55 methodologies for the determination of stormwater runoff quantities. The HydroCAD Report for both pre- and post-development conditions for the 2-, 10-, and 100-year storm events is provided in Appendix D. Table 2.2 Design Rainfall Depths Storm Event Rainfall Depth (inches) 2-Year 3.07 10-Year 4.47 100-Year 7.68 SECTION 3 Section 3 Regulatory Compliance Tighe&Bond Roundhouse Parking Lot Rehabilitation Project Stormwater Management Report 3-4 Section 3 Regulatory Compliance The project is required to comply with the City of Northampton Stormwater Management Ordinance. The following sections demonstrate compliance with the ten Massachusetts Stormwater Standards (Standards), which the Northampton Ordinance is based upon. The Massachusetts Stormwater Checklist is provided in Appendix A. 3.1 LID Measures MassDEP allows for reductions in structural stormwater Best Management Practice (BMP) requirements for water quantity and quality when certain criteria are met. The proposed project includes environmentally sensitive site design and low impact development techniques; however, the applicant is not requesting credit for LID measures. 3.2 Standard 1: No New Untreated Discharges The project will not result in any new stormwater conveyance discharging untreated stormwater directly to the Waters of the Commonwealth. The proposed project results in an increase in impervious ground surface, however no new stormwater discharges are proposed. 3.3 Standard 2: Peak Discharge Rate Attenuation The proposed project is redevelopment, therefore this standard is applicable to the maximum extent practicable. Redevelopment of the Roundhouse parking lot results in an increase in impervious ground surface. Due to the location of the site within the Central Business District and the impracticality of attenuating peak rate on a contaminated site, a waiver from the peak discharge rate attenuation requirement is requested. Existing drainage pathways have been maintained to the maximum extent practicable. Runoff is collected in existing catch basins, treated in proposed proprietary water quality units located within the parking areas, and discharged to the city drainage system. The grassed and wooded area immediately south of the Manhan Rail Trail sheet flows to the south and into an existing depression where stormwater can infiltrate. Table 3.1 presents the results of the pre-development stormwater runoff analysis versus the post-development stormwater runoff analysis, previously described in Section 2.4, for project. Section 3 Regulatory Compliance Tighe&Bond Roundhouse Parking Lot Rehabilitation Project Stormwater Management Report 3-5 Table 3.1 Peak Discharge Rate Comparison 2-Year Storm Event (cfs) 10-Year Storm Event (cfs) 100-Year Storm Event (cfs) Design Point 1 Existing 0.37 0.60 1.13 Proposed 0.37 0.60 1.13 Design Point 2 Existing 5.53 8.55 15.35 Proposed 5.87 9.07 16.29 Design Point 3 Existing 0.02 0.17 0.74 Proposed 0.03 0.13 0.43 Total Project Existing 5.92 9.32 17.22 Proposed 6.27 9.80 17.85 Table 3.1 indicates that existing peak discharge rates for the project and at Design Point 2, increase slightly for all storm events. Design Point 1 represents the drainage area associated with the northern portion of the parking lot currently utilized as reserved parking for the City Hall Annex. Design Point 2 represents the main portion of the parking lot. Design Point 3 represents the grassed and wooded area immediately south of the Manhan Rail Trail. 3.4 Standard 3: Groundwater Recharge The proposed project is redevelopment; therefore this standard is applicable to the maximum extent practicable. Redevelopment of the Roundhouse parking lot results in an increase in impervious ground surface. Due to the location of the presence of contaminated soils on the site, a waiver from the groundwater recharge requirement is requested. MassDEP does not permit stormwater recharge through hazardous materials such as the contaminated soils within the project area. Stormwater runoff from the project area follows existing flow paths to collection in existing catch basins. Treatment for the majority of the parking lot will be provided in hydrodynamic separators prior to discharge to the city drainage system. The grassed and wooded area immediately south of the Manhan Rail Trail sheet flows to the south and into an existing depression where stormwater can infiltrate. Overall, the proposed design generally matches the flow regimes and hydrology of the existing conditions. 3.5 Standard 4: Water Quality Standard 4 of the Massachusetts Stormwater Standards addresses stormwater quality requirements. This standard requires that new stormwater management systems be designed to achieve an 80% Total Suspended Solids (TSS) removal rate prior to discharge. MassDEP has published presumed removal rates for each of the BMP’s featured in their design guidelines. Additionally, this standard addresses the required volume of stormwater runoff that is to be treated by the BMPs, as well as components of a long-term source control and pollution prevention plan. The proposed project is redevelopment, therefore this standard is applicable to the maximum extent practicable. Stormwater treatment units are to be installed in the Section 3 Regulatory Compliance Tighe&Bond Roundhouse Parking Lot Rehabilitation Project Stormwater Management Report 3-6 existing drainage system prior to outlet to the city system. The following treatment train has been incorporated into the design of the stormwater management system: Treatment Train 1: This treatment train consists of proprietary water quality treatment devices. The overall TSS removal for this train is 50%. A Street sweeping program is recommended to further enhance TSS removal for this train and reduce the rate at which sediment accumulates within the drainage system. The grassed and wooded area immediately south of the Manhan Rail Trail will not be collected by the proposed stormwater collection system and will discharge to the south. This generally matches the flow regimes and hydrology of the existing conditions and will not detrimentally impact off-site conditions. The project will result in an improvement to stormwater quality for this site, while minimizing interaction with the contaminated soils present beneath the surface. 3.6 Standard 5: Land Uses with Higher Potential Pollutant Loads (LUHPPLs) The proposed use is not considered a LUHPPL. Therefore, compliance with the additional requirements of Standard 5 is not required. 3.7 Standard 6: Critical Areas This standard does not apply because the project is not within a critical area, however the project has been designed to improve water quality under proposed conditions. The stormwater BMPs selected for the project remove 50% of annual average TSS loading when constructed and maintained properly. 3.8 Standard 7: Redevelopment Projects The project is considered a redevelopment; therefore, the project has been designed to comply to the maximum extent practicable with Standards 2 and 3, and the pretreatment and structural best management practice requirements of Standards 4, 5, and 6. The project has been designed to fully comply with the remaining Standards. 3.9 Standard 8: Construction Period Pollution Prevention, Erosion and Sedimentation Control A construction period Erosion and Sediment Control Plan (ESCP) is provided in Appendix F. The ESCP presents the minimum soil erosion a sediment control practices to be used during construction. General soil erosion and sedimentation control BMPs are indicated on the Site Plans. Additionally, there will be more than one acre of land disturbed as a result of this project, therefore the construction will be required to comply with the Environmental Policy Act (EPA) National Pollutant Discharge Elimination System (NPDES) Construction General Permit (CGP). Coverage under the CGP will be obtained before construction commenced by the Contractor. The Contractor will be required file a Notice of Intent with the EPA and Section 3 Regulatory Compliance Tighe&Bond Roundhouse Parking Lot Rehabilitation Project Stormwater Management Report 3-7 to implement a Stormwater Pollution Prevention Plan (SWPPP) prior to construction. A SWPPP was not prepared as part of this report. 3.10 Standard 9: Long-Term Operation and Maintenance Plan A Long-Term Stormwater Operations and Maintenance Plan is included in Appendix E of this report. The O&M plan indicates the responsible parties for the project, routine and non-routine maintenance tasks and inspection criteria. The O&M Plan also provides guidance on long-term pollution prevention practices for the project. 3.11 Standard 10: Prohibition of Illicit Discharges Illicit discharges to the stormwater management system are discharges that are not entirely comprised of stormwater. Illicit discharge does not include discharges from the following activities or facilities: firefighting, water line flushing, landscape irrigation, uncontaminated groundwater, potable water sources, foundation drains, air conditioning condensation, footing drains, individual resident car washing, flows from riparian habitats and wetlands, dechlorinated water from swimming pools, water used for street washing, and water used to clean residential buildings without detergents. A signed Illicit Discharge Statement is provided in Appendix G. 3.12 Local Stormwater Management Regulations The City of Northampton Stormwater Ordinance follows the Massachusetts Stormwater Management Standards. Compliance with the Massachusetts Stormwater Management Standards was demonstrated in this report. www.tighebond.com