Loading...
291919 - PAR 27 TDE RESPONSE 9-25-22 COMPLETE SUBMISSION46" 169 Haviland Road Queensbury, NY 12804 Hutchins Engineering PLLC Phone: (518) 745-0307 Fax: (518) 745-0308 September 25, 2022 Mr. Craig Brown — Zoning Administrator Town of Queensbury 742 Bay Road Queensbury NY 12804 Re: Engineering Comments — SP 24-2022 Par 27 — Sunnyside Golf Course — Queensbury Site Plan Review Dear Mr. Brown: We are in receipt of the latest Labella comment letter dated June 7, 2022, and we offer the following responses: 1. No response required. 2. We have revised the Hydro -Cad calculations to reflect the 50-year design storm event. 3. We have shown silt fence for the building construction area on drawing S1. The existing gravel parking area will be utilized as the construction entrance. This is a relatively small footprint project which will not create significant erosion or sediment runoff issues. The infiltration trench will be installed and immediately topsoiled and seeded as it is in an area of the existing golf course and is also located in a low area which will not discharge sediment or have an erosion concern. 4. We have included erosion and sediment control notes and details on drawing S2. Winter stabilization standards have been included in the erosion and sediment control details. Again, this is a small footprint project which disturbs soil in the central portion of the property and is relatively flat. 5. We have provided flow path arrows and have depicted the shallow depression area where the infiltration trench will be installed. The area for the entire project is relatively flat with slight depressions one would expect for a small par 3 golf course. The infiltration trench will be installed in the golf course area and the building project is adjacent to the parking area and existing club house. 6. We have performed a test hole and an infiltration test in the proposed infiltration trench area. See drawing S1 for test pit and infiltration test information. 7. The project proposed is a small footprint expansion of an existing 80-year-old golf course and we have prepared the stormwater management with good engineering practices in mind. The stormwater to be treated is collected directly from the roof area and piped directly into an infiltration trench. This project is unique as we have 2 existing septic systems that we need to channel the stormwater away from. Pretreatment of 2,000 sf of roof water is not of greater concern than ensuring that the stormwater is channeled away from the existing septic systems. 8. We will coordinate a draft Stormwater Maintenance Agreement with the Town Planning and Zoning staff if required. 9. We have relocated the infiltration trench to maintain 25 feet or more from the existing septic systems. 10. We have shown the septic and well devices that will be most impacted by the proposed construction. There are no wells within 100 feet of the proposed stormwater device, and we have shown the septic systems within 100 feet of the proposed stormwater device. Any adjacent wells or septic systems would be greater than 100 feet from the proposed stormwater device and are off the golf course parcel. I trust the revised information and revisions adequately address the latest Labella engineering comments. Please contact me if you have any further questions. Best Regards, Thomas Center Jr., P.E. Enclosures is NEW BLCDG ROOF 25 FT LONG X 5 FT WIDE x 3 FT DEEP STONE TRENCH W/ 3 ST MTECH 310'S Subcat Reach on LI flk Drainage Diagram for PAR s SUNNYSIDE GO Prepared by {enter your compan PAR 3 SUNNYSIDE GOLF SIMULATOR ROOF STORMWATER REV 1 Prepared by {enter your company name here} Printed 9/25/2022 HydroCAD® 9.10 s/n 02373 © 2010 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (sq-ft) (subcatchment-numbers) 2,050 98 Roofs, HSG A (1S) 2,050 TOTAL AREA PAR 3 SUNNYSIDE GOLF SIMULATOR ROOF STORMWATER REV 1 Prepared by {enter your company name here} Printed 9/25/2022 Hy_d_roCADO 9.10_s/n 02373 @ 2010 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (sq-ft) Group Numbers 2,050 HSG A is 0 HSG B 0 HSG C 0 HSG D 0 Other 2.050 TOTAL AREA PAR 3 SUNNYSIDE GOLF SIMULATOR ROOF STORMW Type 1124-hr 50 YR Rainfall=4.80" Prepared by {enter your company name here) Printed 9/25/2022 HydroCAD® 9.10 s/n 02373 © 2010 HydroCAD Software Solutions LLC Page 4 Time span=0.00-30.00 hrs, dt=0.05 hrs, 601 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: NEW BLDG ROOF Runoff Area=2,050 sf 100.00% Impervious Runoff Depth=4.56" Flow Length=12' Slope=0.6670'/' Tc=0.1 min CN=98 Runoff=0.36 cfs 780 cf Pond 1P: 25 FT LONG X 5 FT WIDE x 3 FT DEEP Peak Elev=2.89' Storage=47 cf Inflow=0.36 cfs 780 cf Outflow=0.35 cfs 780 cf Total Runoff Area = 2,050 sf Runoff Volume = 780 cf Average Runoff Depth = 4.56" 0.00% Pervious = 0 sf 100.00% Impervious = 2,050 sf PAR 3 SUNNYSIDE GOLF SIMULATOR ROOF STORMW Type 11 24-hr 50 YR Rainfall=4.80" Prepared by {enter your company name here} Printed 9/25/2022 HydroCAD® 9.10 s/n 02373 © 2010 HydroCAD Software Solutions LLC Paae 5 Summary for Subcatchment 1S: NEW BLDG ROOF AREA Runoff = 0.36 cfs @ 11.89 hrs, Volume= 780 cf, Depth= 4.56" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs Type II 24-hr 50 YR Rainfall=4.80" Area (sf) CN Description 2,050 98 Roofs, HSG A 2,050 100.00% Impervious Area Tc Length Slope Velocity Capacity Description min feet ft/ft ft/sec cfs 0.1 12 0.6670 3.17 Sheet Flow, SHEET FLOW Smooth surfaces n= 0.011 P2= 2.40" Smmary for Pond 1 P: 25 FT LONG X 5 FT WIDE x 3 FT DEEP STONE TRENCH W/ 3 STORMTECH 310'; Inflow Area = 2,050 sf,100.00% Impervious, Inflow Depth = 4.56" for 50 YR event Inflow = 0.36 cfs @ 11.89 hrs, Volume= 780 cf Outflow = 0.35 cfs @ 11.91 hrs, Volume= 780 cf, Atten= 5%, Lag= 1.1 min Discarded = 0.35 cfs @ 11.91 hrs, Volume= 780 cf Routing by Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs Peak Elev= 2.89' @ 11.91 hrs Surf.Area= 332 sf Storage= 47 cf Plug -Flow detention time= (not calculated: outflow precedes inflow) Center -of -Mass det. time= 0.9 min ( 740.0 - 739.2 ) Volume Invert Avail.Storage Storage Description #1 0.00, 3 cf 5.00'W x 25.001 x 3.00'H Prismatoid Z=1.0 681 cf Overall - 44 cf Embedded = 637 cf x 0.4% Voids #2 0.00, 44 cf StormTech SC-310 x 3 Inside #1 Effective Size= 28.9"W x 16.0"H => 2.07 sf x 7.12'L = 14.7 cf Overall Size= 34.0"W x 16.0"H x 7.56'L with 0.44' Overla 47 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 0.00' 45.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.33 cfs @ 11.91 hrs HW=2.70' (Free Discharge) L1=Exfi1tration (Exfiltration Controls 0.33 cfs) • BEFORE ANY CLEARING OR GRUBBING OF THE SITE IS INITIATED, AND DURING EARTHWORK PHASES, SEDIMENT CONTROL FENCE SHALL BE INSTALLED AS SHOWN ON THE PLAN. • AT THE CONCLUSION OF EACH DAYS WORK AND AFTER EVERY STORM EVENT, SEDIMENT CONTROL FENCE AND ANY OTHER EROSION CONTROL MEASURES SHALL BE INSPECTED FOR FAILURES OR SEDIMENT ACCUMULATION. ANY FAILURE SHALL BE IMMEDIATELY CORRECTED. • TEMPORARY RAPID GROWTH COVER CROPS FOR THE SEDIMENT CONTROL AREAS, SUCH AS ANNUAL RYEGRASS MAY BE USED FOR TEMPORARY SURFACE STABILIZATION DURING THE CONSTRUC710N PHASES, APPLY AT A RATE OF 35—LBS PER ACRE. • SEDIMENT SHALL BE REMOVED FROM SEDIMENT TRAPS AND BASINS WHENEVER THEIR CAPACITY HAS BEEN REDUCED BY 50% • ALL BARE EARTH AREAS SHALL BE SEEDED AND MULCHED WITHIN 14—DAYS OF COMPLETION OF WORK IN THE AREA. ONLY AREAS WHICH ACTIVELY UNDER CONSTRUCTION MAY REMAIN OPEN FOR MORE THAN 5 DAYS.. ONCE CONSTRUCTION IS COMPLETED IN THESE AREAS, SEED AND MULCH SHALL BE INSTALLED WITHIN 14—DAYS. • FOR VEGETATED RETENTION AREAS, CUT SLOPES AND SLOPES FOR THE RETENTION BASINS, TOPSOIL AND INSTALL SEED MIXTURE AT A RATE OF 75—LBS PER ACRE, APPLY 10-10-10 STARTER FER71LIZER AND MULCH. • TEMPORARY EROSION CONTROL MEASURES, INCLUDING SEDIMENT CONTROL FENCE AND/OR MULCH, SHALL BE INSTALLED AND MAINTAINED FOR ANY TEMPORARY SOIL STOCKPILE AREAS THAT ARE TO BE LEFT FOR MORE THAN 24—HOURS. • DURING FINAL SITE GRADING, REMOVE ALL ACCUMULATED SEDIMENT, SCARIFY SUBSOILS AND PERFORM SOIL RESTORATION TECHNIQUES OVER SPECIFIED AREAS. • FOR GROUND CLEARING ACTIVITIES OCCURRING BETWEEN OCTOBER 15 & APRIL 15, IN WHICH VEGETATION CANNOT BE ESTABLISHED, EXPOSED EARTHEN AREAS SHALL BE COVERED WITH EITHER A TARP COVER OR AN EXTRA HEAVY LAYER OF MULCH. • ANY AREA OF REVEGETATION MUST EXHIBIT A SURVIVAL OF A MINIMUM OF 8= OF THE VEGETA7ION THROUGHOUT THE YEAR FOLLOWING REVEGETATION. REVEGETATE AS NEEDED TO MEET THIS REQUIREMENT. • THE CONTRACTOR SHALL CONDUCT AN INSPECTION OF THE SITE ON A DAILY BASIS TO COLLECT LITTER AND CONSTRUC7ON DEBRIS AND DISPOSE OF LEGALLY. • FOR CONSTRUCTION ACTIVITIES INVOLVED WITH ONGOING LAND DISTURBANCES AND EXPOSURE BETWEEN NOVEMBER 15TH AND APRIL 1ST, WINTER STABILIZATION MEASURES ARE TO BE IMPLEMENTED, IN ACCORDANCE WITH PAGE Z38 OF THE NEW YORK STATE STANDARDS AND SPECIFICATIONS FOR EROSION AND SEDIMENT CONTROL (THE BLUE BOOK). • THE CONTRACTOR SHALL COMPLY WITH THE NEW YORK STATE STANDARDS AND SPECIFICATIONS FOR EROSION AND SEDIMENT CONTROL (THE BLUE BOOK). STANDARD O. STABILIZATIONWINTER Definition & Scone A temporary site specific, enhanced erosion and sediment control plan to manage runoff and sediment at the site during construction activities in the winter months to protect off -site water resources. Conditions Where Practice Applies This�standard applies to all construction activities involved with ongoing land disturbance and exposure between November 15t" to the following April I" Design Criteria 1. Prepare a snow management plan with adequate storage for snow and control of melt water, requiring cleared snow to be stored in a manner not affecting ongoing construction activities. 2. Enlarge and stabilize access points to provide for snow management and stockpiling. Snow management activities must not destroy or degrade installed erosion and sediment control practices. 3. A minimum 25 foot buffer shall be maintained from all perimeter controls such as silt fence. Mark silt fence with tall stakes that are visible above the snow pack. 4. Edges of disturbed areas that drain to a waterbody within 100 feet will have 2 rows of silt fence, 5 feet apart, installed on the contour. 5. Drainage structures must be kept open and free of snow and ice dams. All debris, ice dams, or debris from plowing operations, that restrict the flow of runoff and meltwater, shall be removed. 6. Sediment barriers must be installed at all appropriate November 2016 perimeter and sensitive locations. Silt fence and other practices requiring earth disturbance must be installed before the ground freezes. 7. Soil stockpiles must be protected by the use of established vegetation, anchored straw mulch, rolled stabilization matting, or other durable covering. A barrier must be installed at least 15 feet from the toe of the stockpile to prevent soil migration and to capture loose soil. 8. In areas where soil disturbance activity has temporarily or permanently ceased, the application of soil stabilization measures should be initiated by the end of the next business day and completed within three (3) days. Rolled erosion control blankets must be used on all slopes 3 horizontal to 1 vertical or steeper. 9. If straw mulch alone is used for temporary stabilization, it shall be applied at double the standard rate of 2 tons per acre, making the application rate 4 tons per acre. Other manufactured mulches should be applied at double the manufacturer's recommended rate. 10. To ensure adequate stabilization of disturbed soil in advance of a melt event, areas of disturbed soil should be stabilized at the end of each work day unless: a. work will resume within 24 hours in the same area and no precipitation is forecast or; b. the work is in disturbed areas that collect and retain runoff, such as open utility trenches, foundation excavations, or water management areas. 11. Use stone paths to stabilize access perimeters of buildings under construction and areas where construction vehicle traffic is anticipated. Stone paths should be a minimum 10 feet in width but wider as necessary to accommodate equipment. Maintenance The site shall be inspected frequently to ensure that the erosion and sediment control plan is performing its winter stabilization function. If the site will not have earth disturbing activities ongoing during the "winter season", all bare exposed soil must be stabilized by established vegetation, straw or other acceptable mulch, matting, rock, or other approved material such as rolled erosion control products. Seeding of areas with mulch cover is preferred but seeding alone is not acceptable for proper stabilization. Compliance inspections must be performed and reports filed properly in accordance with the SWPPP for all sites under a winter shutdown. Page 2.38 New York State Standards and Specifications For Erosion and Sediment Control 10'-0" 0. C. MAX. SW 8" MIN. S A, � PERSPECTIVE i z g 0 N FLOW--� 7.7, SECTION 36" FENCE POST DRIVEN MINIMUM 16" INTO GROUND SILT STOP EMBED IN GROUND 8" MIN. SOIL BACKFILL FENCE POST SILT STOP EMBED IN GROUND 8" MIN. UNDISTURBED GROUND SEDIMENT CONTROL FENCE DETAIL NTS SLOPE LENGTH/FENCE LENGTH M. SLOPE STANDARD REINFORCED SUPER <27. 30011500 N/A N/A 2-107. 12511000 25012000 30012500 10-20% 1001750 15011000 20011000 20-33% 60/500 80/750 100/1000 33-50% 40/250 70/350 1001500 >50% 20/125 30/175 50/250 LAWN AREA FILTER FABRIC MIRAFI 140N OR EQUAL STONE FILLED INFILTRATION BED WITH 3/4"-3" WASHED CRUSHED STONE NATI VE SOILS STORM TECH 310 HEAVY DUTY CHAMBER QTY PER PLAN STANDARD SPECIFICATIONS FOR SILT FENCE DEFINITION A TEMPORARY BARRIER OF CE07EX77LE FABRIC INSTALLED ON THE CONTOUR ACROSS A SLOPE TO IN7ERCEPT SEDIMENT LADEN RUNOFF FROM SMALL DRAINAGE AREAS OF DISTURBED SOILS. PURPOSE TO REDUCE RUNOFF VELOCITY & TO EFFECT DEPOS17ION OF TRANSPORTED SEDIMENT LOAD. ADDI r('ATTMI — MAXIMUM ALLOWABLE SLOPE LENGTHS CONTRIBUTING RUNOFF TO THE FENCE PLACED ON A SLOPE. 1:2 SLOPE (50%) 25 FT 1:3 SLOPE (339) 50 FT 1:4 SLOPE (2511.) 75 FT 1:5 SLOPE OR LESS 100 FT — MAXIMUM DRAINAGE AREA FOR OVERLAND FLOW SHALL NOT EXCEED 1/4 ACRE PER 100 FEET OF FENCE WITH MAXIMUM PONDING DEPTH OF 1.5 FEET — EROSION WILL OCCUR AS SHEET EROSION. — CONCENTRATED WATER FLOW SHALL NOT BE DIRECTED TO FENCE. DESIGN CRITERIA — ALL SILT FENCES SHALL BE PLACED AS CLOSE TO 7HE DISTURBED AREAS AS POSSIBLE, WITH A MINIMUM OF 10 FEET FROM THE TOE OF A SLOPE. THE AREA BEYOND THE FENCE MUST BE UNDISTURBED OR STABILIZED. — SENSITIVE AREAS TO BE PR07ECTED BY SILT FENCE MAYBE NEED TO BE REINFORCED BY USING HEAVY IMRE FENCING FOR ADDED SUPPORT. - WHERE THE ENDS OF THE SILT FENCE COME TOGETHER, THE TWO ENDS SHALL BE OVERLAPPED, ROLLED TOGETHER AND STAPLED TO PREVENT SEDIMENT BYPASS AT THESE CONNECTIONS. FABRIC MATERIAL CRITERIA GRAB TENSILE STRENG774: 90 LBS ASTM D1682 ELONGATION AT FAILURE 507. ASTM D1682 CONSTRUCTION SPECIFICATIONS 1. WOVEN WIRE FENCE TO BE FASTENED SECURELY TO FENCE POSTS W1774 WIRE 71ES OR STAPLES. POST SHALL BE STEEL EITHER "T" OR "U" TYPE OR HARDWOOD. 2. FILTER CLOTH TO BE FASTENED SECURELY TO WOVEN WIRE FENCE WITH TIES SPACED EVERY 24" AT TOP AND MID SECTION. FENCE SHALL BE WOVEN WIRE, 6" MAX. MESH OPENING. 3. WHEN TWO SECTIONS OF FILTER CLOTH ADJOIN EACH OTHER THEY SHALL BE OVER —LAPPED BY 6—INCHES AND FOLDED. FILTER CLOTH SHALL BE EITHER FILTER X, MIRAFI 100X, STABILINKA T140N OR APPROVED EQUIVALENT. 4. PREFABRICATED UNITS SHALL BE GEOFAB, ENWROFENCE OR APPROVED EQUIVALENT. 5. MAINTENANCE SHALL BE PERFORMED AS NEEDED AND MATERIAL REMOVED WHEN "BULGES" DEVELOP IN THE SILT FENCE. ROOF INFILTRATION TRENCH SCALE: NTS 12" MIN. COVER Call Before You Dig ® Wait The Required Time ® Confirm Utility Response M Respect The Marks ® Dig With Care 800-962.7962 www.digsafelyneviyork.com TAX MAP # 290.5-1-50.1 & 290.6-1-11