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Home My WebLink About20190313 Skidmore Swing Bldg Engineering Resp 5-28-19 The LA GROUP Landscape Architecture di.Engineering P.C. People.Purpose.Place. 40 Long Alley Saratoga Springs NY 12866 p:518-587-8100 518-587-0180 www.thelagroup.com May 28, 2019 Ms. Susan Barden,AICP City Principal Planner City of Saratoga Springs 474 Broadway Saratoga Springs, NY 12866 RE: Skidmore College,Annex Building Engineering Review Dear Ms. Barden: The LA Group is in receipt of comments from Barton &Loguidice, dated May 20, 2019. The following are responses to the comments. Plans and SWPPP will be revised accordingly and submitted to the City and Barton &Loguidice at a later date. General Comment 1: Add NYSDEC stormwater permit to question 2 of SEAF. Response 1: The NYSDEC stormwater permit will be added to question 2 of the SEAF. Comment 2: Add forest to supplement question 14 on the SEAF short form. Response 2: Forest will be added to supplement question 14 on the SEAF. Comment 3: Some unit costs in the cost estimate seem quite low. Examples are tree clearing for$5,000 total, Hydrodynamic Separator at$10,000 and concrete sidewalk at$5 per square foot. Please clarify or revise. Response 3: The unit costs included in the LOC will be reviewed and revised as needed. Water and Sanitary Sewer Comment 1: We request confirmation that the new fire sprinkler systems can get the required fire flow from the system per NFPA standards. Discuss internal plumbing connections to existing building briefly and show fire flow computations in Engineer's Report. Sprinklers are proposed for the Swing Building the fire suppression systems must be able to convey the required fire flow demand based on building construction type, use and occupancy. Can the existing system and proposed 6-inch connection furnish the required fire flow reported to be 2,500 GPM as proposed? Have hydrant flow tests taken place? Response 1: A full building permit package, including the fire protection, plumbing design, and internal fire protection will be submitted to the City Building Department for review. NFPA 13 and NFPA 14 will be complied with fully,with respect to the design of the building's sprinkler and standpipe systems. A hydrant flow test has not been conducted in the vicinity of the project; however, Skidmore anticipates that a booster pump may be required and is planning to provide one if necessary. The 6"fire service supplying the building's fire protection systems is adequately sized. Comment 2: Where will a RPZ backflow preventer be located for this project, inside the building? Factor in RPZ and all head losses for fire prevention calculations. Response 2: An RPZ will be provided inside the building. Comment 3: What is distance from proposed hydrant on north side of building to the building?Should be 50'or more per NFPA code. Response 3: The hydrant will be relocated to be 50 LF away from the building. Comment 4: Open existing sanitary sewer manhole and assess need to move internal steps if in close proximity to new pipe from the Annex Building. Response 4: The existing sanitary sewer manhole will be investigated. Stormwater Stormwater Pollution Prevention Plan (SWPPP) Comment 1: Section 3.5 of the SWPPP is inconsistent with question 12a of the SEAF. Please clarify. Response 1: The project is located within an archaeologically sensitive area, however, based on the review by OPRHP it was determined that no properties, including archeological and/or historic resources, listed in or eligible for the New York State and National Registers of Historic Places will be impacted by this project. The SWPPP language will be revised to reflect this determination. Comment 2: Add in existing wet pond to section 3.6 as this will treat quality and quantity prior to discharging to City of Saratoga Springs system. Response 2: The existing wet pond system will be added to section 3.6 of the SWPPP. Comment 3: Add provision for City Engineer's office inspection and approval for section 4.3 prior to removing erosion and sediment control measures. Response 3: A provision will be added to section 4.3 of the SWPPP regarding a final inspection via the City Engineer's office prior to removal of erosion and sediment controls. Comment 4: In NOI please add in existing facility wet pond under question 9. Response 4: The existing wet pond will be added to the NOI under question 9. Comment 5: Add notes in SWPPP maintenance section and also on plans for the requirement to coordinate and inspect the stormwater practices with City staff one year after completion. a. We observed some site excavation during a site visit on 6-21-17. Please verify levels and intent of disturbances are consistent with NYSDEC requirements and NOI. Has the NOI been filed yet? Response 5: The provision for the stormwater practices to be inspected one year after completion is included in the SWPPP under section 1.1: "All post-construction stormwater management facilities must be inspected annually by a qualified professional, a report prepared and submitted to the City Engineer documenting the inspections as well as the maintenance activities that were completed during the prior year." a. The site excavation observed was apart of another project on the Skidmore College campus. The project involved relocating and repairing existing underground utilities and is under an acre and therefore did not require NYSDEC coverage and an NOI. This project disturbed an area in the vicinity of the Palamountain parking lot project, and erosion and sediment control measures were inspected as part of said project. Plans Comment 1: The plan set would benefit with a key map that indicates where the site is on the campus wide location plan in our opinion. Response 1: Two key maps are currently provided on the cover sheet. L-3 Comment 1: Label the width of clearing for the water and sewer service pipelines. Ensure at least 10'of clearance to trees at ground level. Response 1: The width of clearing will be labeled. Comment 2: Label all sloped areas to receive stabilization per erosion control matting. Response 2: All sloped areas that are required to receive erosion control matting are labeled and contain a hatch to indicate extents. Refer to sheet L-3 and detail 4 on sheet L-4. Comment 3: How is drainage channel from SE corner of building to existing wet pond?This channel is fairly deep. There are some elevations (3)along this route.Are there check dams proposed at these? Label all means of stabilization and velocity controls. Response 3: Refer to sheet L-1 for proposed check dams and stabilization measures(erosion control matting). Comment 4: Grading for expanding wet pond will receive this drainage channel and should reflect stabilization of a formed channel all the way down to permanent pool elevation. Response 4: The Wet Pond will be revised to add a formed channel down to the permanent pool elevation. L-6 Comment 1: Show project specific elevations and dimensions for detail 9, Hydrodynamic Separator. Response 1: Project specific invert elevations and pipe sizes are indicated on the plans,sheet L-3. Sincerely, ,,,,,)".,,Aer. ,,,.,„...,. — ,,, .41 t: . ,- ,,,,, „ ,,,, „.., . ., ,:,.,,,,,, , „..„. _ Douglas B. Heller, PE,ASCE Associate Principal Director of Civil Engineering/ Civil Engineer dheller@thelagroup.com G:AProj-2018\2018135_Skidmore_Flex_Building\2018135Admin\OlCorrespondence\2.2Letters\2019 05-28 Comment_Response Ltr..docx