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Home My WebLink About20210757 Myrtle Street Site Plan Engineering Report- Water and Sanitary Sewer la The LA GROUP Landscape Architecture @ Engineering P.C. People.PKPpose.Place. 40 Long Alley Saratoga Springs NY 12866 p. 518-587-8100 f 518-587-0180 Engineering Report www.thelagroup.com Water and Sanitary Sewer For Saratoga Hospital- Myrtle Street Myrtle Street SARATOGA SPRINGS, NEW YORK Planning Board #XXX Prepared For Saratoga Hospital 221 Church Street Saratoga Springs, NY 12866 Contact: Kevin Ronayne Prepared By The LA Group, P.C. 40 Long Alley Saratoga Springs, New York 12866 r ,�r Tir 1elyl j CC r ) r 1 1 itik.r ,.IL my -r C7 09655& <Ce �AAQFESSIQ \ July 22, 2021 Engineering Report Saratoga Hospital-Myrtle Street 201517 L Introduction The proposed project involves the development of a four(4) story medical buildings and renovation of an existing residential home into an office located on the North side of Myrtle Street and Morgan Street. The medical building will have a total of 75,000 sf Total office space in the existing building will be approximately 4,000 sf The property is currently undeveloped woodland with an existing residence. Municipal water exists on Myrtle street to the south of the property and on Morgan street to the east of the property. Municipal sewer exists in Myrtle Street south of the property. Water will be supplied for domestic and fire protection through a new 8-inch water main extension down Morgan Street to connect into the 6-inch main on Myrtle to loop the system. This existing 6-inch and 8-inch water mains are owned by the City of Saratoga Springs. For sanitary sewer collection, a new system of pipes and manholes will connect to a new manhole on the City of Saratoga Springs sewer line within Myrtle Street. IL Project Description The project proposes a new 75,000 sf three (3) story building and existing 4,000 sf residence to be converted into office space with associated access drives, parking areas, landscaping, stormwater management and connection to existing water and sewer. III. Existing Water and Sanitary Sewer Utilities Municipal water service is currently provided by the City of Saratoga Springs. A 6-inch diameter water main located in Myrtle Street and an 8-inch main is located on Morgan Street. A hydrant flow test was conducted July 13, 2021 on both Myrtle Street and Morgan Street. The 6- inch main on Myrtle Street indicated static pressures in the area of 50 pounds per square inch(psi). During the flow test, the pitot has a pressure of less than 10 psi and therefore the test results were not valid. Calculated flowrate was approximately 265 gallons per minute. A separate flow test was completed on the 8-inch line on Morgan Street. The 8-inch main on Morgan Street indicated static pressures in the area of 53 pounds per square inch(psi). With the hydrants running at approximately 795 gallons per minute caused the residual pressure to drop to 1 Engineering Report Saratoga Hospital-Myrtle Street 201517 approximately 40 psi giving a theoretical available flow of approximately 1,316 gallons per minute at 20 pounds per square inch(psi). Refer to Attachment A for the Hydrant Fire Flow Test Summary provided by North East Fire Protection Systems Inc. Municipal sanitary sewer service is available from the City of Saratoga Springs via an 8" PVC sewer line within Myrtle Street. A new 8" PVC sewer line is proposed from the existing manhole within Myrtle Street to the project site. Wastewater entering this manhole is conveyed by gravity to the south to the intersection of Church Street and Myrtle Street. IV. Projected Water and Wastewater Flows The tables below provide information on the anticipated wastewater flow rates for the project: Table 1 (Entire project) Description Use Rate Total Use Doctor's Office(24 units) 250 gpd/each4 6,000 gpd Office Employees 15 gpd/each4 180 gpd Total 6,180 gpd For the entire project, average daily flow for wastewater is estimated to be 8.6 gallons per minute (gpm)based on a 12-hour day. Estimated peak hourly flow is 37.0 gpm (4.30 x average).2 Average daily demand for water is estimated to be approximately equal to the wastewater flow or 4.3 gpm. Instantaneous demand is calculated at 72 gpm. Summary of Design Flows Water Consumption: Project ADF = 6,180 gal/day (gpd) Instantaneous Water Use = 72 gal/min (gpm) Sanitary Sewer Flows: Project ADF = 6,180 gal/day (gpd) Peak Hourly Flow (PHF) = 37.0 gal/min (gpm) For the entire project, average daily flow for wastewater is estimated to be 8.6 gallons per minute (gpm)based on a 12-hour day. Estimated peak hourly flow is 37.0 gpm (4.30 x average).2 The estimated population served is based on 24 total doctors and 12 employees in the separate office building (36 total). 2 Engineering Report Saratoga Hospital-Myrtle Street 201517 For the purposes of input into the City of Saratoga Springs water model, we offer the following estimated water demands for the project: • Average Day Demand is 8.6 gallons per minute (GPM) over the 24-hour period. • Max Day Demand is 17.2 gallons per minute (GPM)based on twice the average. • Peak Hourly Flow is 37.0 gallons per minute (GPM)based on 4.30 times the average. • Fire Flow Demand is 1,000 gallons per minute (GPM)per ISO guidelines. V. Proposed Water and Wastewater Utilities Proposed Water Utilities To service the project, connections to the existing tees on both the 6-inch water main on Myrtle Street and the 8-inch ductile iron waterline on Morgan Street will be installed. Needed Fire Flow(NFF) calculations using the ISO Guide for Determination of Needed Fire Flow are presented in Attachment B. The calculation shows a NFF of 1,000 gallons per minute. This calculation is for a sprinklered building. For a building protected by an automatic fire sprinkler system, the ISO states: "The NFF for residential occupancies (such as apartment buildings, lodgings and rooming houses, board and care facilities, hotels, motels and dormitories)protected by an automatic fire sprinkler system installed in accordance with the general criteria ofNFPA 13R, Standard for the Installation of Sprinkler Systems in Residential Occupancies up to and including Four-Stories in Height, is the demand at the base of the automatic sprinkler riser". "The minimum NFF is 1,000 gpm at 20 psi for a duration of 2 hours". Using the minimum given by ISO, the NFF for this facility is 1,000 gpm. Hydrant flow test data indicates 1,316 gpm available at 20 psi. Based on this information, there is adequate fire protection water supply available at the site. The water service proposed for the main building will be a 6-inch ductile iron pipe while the existing residence will connect via a 4" ductile iron pipe. Each building will be metered separately. Connections and appurtenances, including tapping sleeves and valves, mechanical joints, tees, isolation valves, fire hydrants, thrust blocks, trenching, bedding, service connections, as well as testing and disinfection will all be specified in accordance with City of Saratoga Springs standards. 3 Engineering Report Saratoga Hospital-Myrtle Street 201517 Proposed Wastewater Utilities Sanitary wastewater will be piped via a 6-inch PVC lateral installed at a minimum slope of 2.0%. A new 8-inch PVC sewer main will be installed at a minimum slope of 0.5% and will be connected to the existing 8" PVC sewer main on Myrtle Street. Sewer cleanouts have been located at each building lateral for servicing. The existing residence will connect to a new manhole via a 1.5" HDPE sanitary force main. An E-1 grinder pump is proposed to the north of the existing residence. All sanitary sewer mains, laterals, manholes and manhole connections will be furnished, installed and tested according to City of Saratoga Springs standards. Notes 1. From Table 1,Appendix 75-A Wastewater Treatment Standards-Residential Onsite Systems (110 gallons per day per bedroom) 2. From Figure 1, GLUMRB Recommended Standards for Wastewater Facilities Q=(18+P%)±(4 +P'/2)where P=population in thousands 3. From Table XXII, Community Water Systems Source Book,Ameen (2.0 gpm/employee). 4. From Table B-3,NYSDEC 2014 Design Standards for Wastewater Treatment Systems. Attachments Attachment A Water Design Information: • Water Demand Calculations Attachment B Sanitary Sewer Design Information: • Sewer Flow Calculations Attachment C Hydrant Flow Test Report 4 ATTACHMENT A WATER DESIGN INFORMATION Saratoga Hospital 7/23/2021 Myrtle Street ESTIMATE MAXIMUM DAILY DEMAND: DOCTOR'S OFFICE NUMBER OF Doctors 24 DESIGN FLOW = 250.0 GPD/SF (NYSDEC) Qd = 6,000 GPD OFFICE EMPLOYEES NO. OF EMPLOYEES 12 DESIGN FLOW = 15.0 GPD/EA (NYSDEC) Qd = 180 GPD MAX. DAILY DEMAND, Q = 6, 180 GPD (Qa through Qd) POPULATION SERVED = 60 AVG. DAILY DEMAND = 8.6 GPM ( 12 HOURS ) PEAK HOURLY DEMAND = 37.0 GPM ( AVG x 4.30 ) INSTANTANEOUS DEMAND = 72 GPM 36 people x 2 GPM*** * WATER SUPPLY FIXTURE UNITS FROM NYS BLDG. CODE TABLE E103.2 ** WATER SUPPLY DEMAND FROM NYS BLDG. CODE TABLE E103.3 (3) *** AMEEN TABLE XXII "Instantaneous Water Demands for Residential Areas" 1 ATTACHMENT A ATTACHMENT B SANITARY SEWER DESIGN INFORMATION N O H N Z M [7� N o m x/c� W „. U C C +4 E o- H a II =• O > > m co Cl 0 d a ii to _ a5 0 > co TC LL II II 'V c to 0 Cf ° °� o o O LL LL Q LL LL G a LL LL LL 0 lN > °l T N U 0- 0 .-7. a) > L Q T U ++ -° a U t O 3 u v O > > W U E 00 C7 ,, E L o > E Q m a) rn 0 2 -a o E 0 o_ C_ v 2 u w N m a a) o o_ c3U ro 'a N. cc w N. 3 +p r; 7°_ 0 XLL t0 C E °o N c 3 O O 0 to a) .� ,V ,V u o CO I� m 0 0 CO CO O l° c-1 0 ^ 0 l° ++ 0 0 o m o o =o 0 0 0 0 0 U 3 0 w a) m E .X II O m ct Q rn A—, Cf o_ o ii � a - � x 0 a5 0 II '0 LL E 0 a) K N 3 cd C/1 aoca, 0 3 3 + L .-. I d E II O O II II N , Q O 0 1 o 6s o E azi to c to cc >, al a) o Q '— '— 3 Q C0 a o_ n, O a) a) 0 a) C/D 4 a s 2 7 id id LL id ATTACHMENT C HYDRANT FLOW TEST REPORT Zoirt% Saa 7oze Pm-teal:oft i P.O. BOX 508 BURNT HILLS, N.Y. 12027 (518)885-1115 FAX(518)885-0526 HYDRANT FLOW TEST REPORT LOCATION: Yo.,, ST ci 11104644) r TEST BY: C Y ST et�,.)4"Q_17 Marie/5 &u c; titArirt : _. 77i DATE: 7- 3 2-1 TIME: 1, TARGET HYD. LOCATION (B)" TEST RESULTS : STATIC PRESSURE (B) 50 PSI RESIDUAL PRESSURE (B) 1'4PSI WITH L (A) GPM FLOWING RESIDUAL PRESSURE (B) PSI WITH (A) GPM FLOWING FLOW HYD. LOCATION (A) 441t os I 1) PORT FLOWED (A) °' DIAMETER SinCtriii 2) PORT FLOWED (A) DIAMETER 3) PORT FLOWED (A) DIAMETER 1) PITOT or FLOW METER READING (A) 5' PSI AT 2,A,5 GPM 2) PITOT or FLOW METER READING (A) PSI AT GPM 3) PITOT or FLOW METER READING (A) PSI AT GPM OUTLET COEFFICIENT USED (smooth 0.90) (square & sharp 0.80) (projecting into barrel 0.70) ESTIMATED FLOW AT 20 PSI GPM LOCATION SKETCH ATTACHED ? YES NO e � 7/afte Eaa VW PfriotectioetSvat g/4r / tc, P.O. BOX 508 BURNT HILLS, N.Y. 12027 (518)885-1115 FAX(518)885-0526 our HYDRANT FLOW TEST REPORT LOCATION: Ic sE,kiAtb �. TEST BY: :��_:: �'. _ ��'' ' DATE: - , ,.. TIME: eti AVAI TARGET HYD. LOCATION (B) ° TEST RESULTS : STATIC PRESSURE (B) 53 PSI RESIDUAL PRESSURE (B) 40 PSI WITH 741 (A) GPM FLOWING RESIDUAL PRESSURE (B) PSI WITH (A) GPM FLOWING FLOW HYD. LOCATION (A) It. Z... 1) PORT FLOWED (A) L DIAMETER 5040614 2) PORT FLOWED (A) DIAMETER 3) PORT FLOWED (A) DIAMETER 1) PITOT or FLOW METER READING (A) , PSI AT 7 5 GPM 2) PITOT or FLOW METER READING (A) PSI AT GPM 3) PITOT or FLOW METER READING (A) PSI AT GPM OUTLET COEFFICIENT USED e 90 (smooth 0.90) (square & sharp 0.80) (projecting into barrel 0.70) ESTIMATED FLOW AT 20 PSI 131 GPM LOCATION SKETCH ATTACHED ? YES >C NO Iv .0" .7."!-".":7'. " - V — -"°174111111, ' — - '4,-- - .e. .7° '----; . ..-..r:r•. 0,-..-.410:100—- - 1:6.4z..A.r. :4;7..rj ..,:' '11," •.. , • -. .1•11•1141111A 141111" , I'll 1 44(1 � iY r � :). --4..,'„:'''_. ,!..1,r.,..„, . .1- . .t. .,,,. _ +- + ; 'moi a ,.. , , _ ' . .. 0i 444*St ' A. its. t ! . llti°. k" • LOW L NIDI '-, `sv!. ' q4 JtF 4.• • ,. , ,Ifo." ...A _.,\,Fti c .;;,�; ,' 9 .f - r i . 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