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HomeMy WebLinkAboutProject Narrative Project Narrative FOR COLBEA ENTERPRISES, LLC 473, 479 & 487 Station Ave, Yarmouth, MA Prepared By: 31 Hayward Street, Ste. E-1 Phone: 508-528-0770 Garrett Small, P.E. Date: 02/23/2023 HFA Project No. 42-21-20002 LOT DESCRIPTION The project lots are located in the B-1 District and Aquifer Protection Overlay District and are currently forested with no existing land use. There are no existing utilities or stormwater structures on the project site. There are no existing buildings or impervious pavement surfaces on the site. The project site is located outside of the 100-year floodplain, and during soil testing no indications of groundwater were encountered to a minimum of 16' below grade. PROJECT DESCRIPTION The proposed project includes the construction of a new 3,600 s.f. Seasons Corner Market with a basement, a new 3,648 s.f. overhead canopy with 6 new fuel dispensing islands with diesel product, 2 EV charging spaces, 2 new 15k underground double walled fiberglass storage tanks with associated utility, grading, storm water, landscaping, and curbing improvements. DRAINAGE SYSTEMS DESCRIPTION The existing project area has no stormwater management components, with the rear third of the site sloping toward the abutter to the south, which contains abandoned railroad tracks. The front two thirds of the site flows to two depressed areas on site which retain and infiltrate stormwater. The proposed stormwater management system design consists of two Bioretention Areas with 1,500 gallon oil/grit separators, and two subsurface infiltration chamber systems using ADS Stormtech MC- 4500 chambers, with treatment provided by Isolator Rows. The system is designed to treat and infiltrate the 100-year storm, with no runoff from impervious surfaces to the street or abutting properties. CONSTRUCTION SEQUENCE 1. Site construction entrance/exit installation, temporary compost filter socks and construction fencing shall be placed outside the limits of construction per plans. 2. Site clearing of trees, except for those marked to remain, and as shown on the Landscape Plan. 3. Scraping and stockpiling of loam for reuse, and rough grading. 4. Excavation and installation of the building foundation and canopy footings. 5. Installation of the underground fuel storage tanks and fuel piping. 6. Construction of the seasons corner market building. 7. Installation of the canopy, fuel islands, and fuel dispensers. 8. Installation of site utilities and septic system. 9. Installation of stormwater management system and bioretention areas. 10. Installation of curbing, concrete sidewalk, concrete parking area, concrete tank pad, fuel island mat, and concrete drive-thru mats. 11. Construction of trash enclosure. 12. Final grading. 13. Installation of asphalt pavement. 14. Placement of loam in turf and landscape bed areas. 15. Installation of landscaping and seeding of turf areas. 16. Parking lot pavement paint striping. 17. Placement of mulch in landscape areas. 18. Stocking of the store and filling of the fuel storage tanks. 19. Completion of punch list items and final clean up. 20. Estimated time of construction, 4 months. Performance Standards per Section 2.05 1. LID: The site development has been minimized as much as possible, and two Bioretention Areas are proposed for natural stormwater treatment. 2. Good Housekeeping Procedures: 1. The roofs, building gutters, and downspouts will be inspected at least once per year for any debris, such as leaves, and cleaned as necessary. Typically, this work will be done in late autumn after all the leaves nearby trees have fallen. 2. A trash receptacle will be provided with regular collection. The trash enclosure area will be continuously maintained so that no loose trash or other waste will be scattered about on the ground. Any spills will be cleaned up immediately. The enclosures will be swept regularly to keep them in a clean and orderly condition. 3. The lot, including access ways, parking areas, fences, walls and landscape will be inspected daily, and any trash will be collected and properly disposed. 4. All yard light bulbs shall be replaced within 48 hours. 5. In the event of settling or broken pavement, the pavement will be properly replaced as needed. At least once per month, the pavement areas will be swept and all sediment will be collected and properly disposed. 6. At least once every week, parking areas and the Bioretention Areas will be inspected for debris and litter and cleaned as required. 7. All materials used for the facility will be stored inside the climate-controlled building. All waste products will be disposed of immediately in the dumpster onsite, or in the waste receptacles provided at the pump islands or on the sidewalk. 8. No vehicle washing or maintenance will be conducted on the site. The catch basins, stormwater quality units, and Bioretention Areas will be inspected and cleaned on a regular basis per the schedule and procedures in the Stormwater Operation and Maintenance Plan. 9. Cutting of grass, pruning of shrubs and trees, fertilizing, etc. will be done on a scheduled basis. Any waste organic material produced by cutting or pruning will be removed from the site and properly disposed of. 10. No landscape chemicals are to be stored outside on the site. Fertilizers, herbicides & pesticides will be used as minimally as possible, on an as-needed basis, to include lawn food, weed prevention and grub control. 3. Stormwater Management Systems: (a) Calculations demonstrate that post development peak flows do not exceed pre-development peak flows. The 100 year storm will be retained and infiltrated onsite. (b) The Isolator Rows and Bioretention Areas will remove a minimum of 80% TSS. (c) Calculations are based on NOAA Atlas 14 data. 4. Stormwater Management Systems for New Developments: BMPs used will retain and infiltrate more than the 1.0 inch water quality volume. 5. Stormwater Management Systems for Redevelopments: There are no redevelopments as part of this project. 6. TSS removal percentage exceeds the average removal required for a 1 year period. 7. There are no discharges to waterbodies from the stormwater management system.