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Home My WebLink AboutCT 15-05; QUARRY CREEK PLANNING AREA R3; WATER STUDY; 2015-10-20&0~ PLANNING ENGINEERING SURVEYING · WATERSTUDY FOR QUARRY CREEK PLANNING AREA R-3 City of Carlsbad, CA PREPARED FOR: PRESIDIO CORNERSTONE QC, LLC 4365 EXECUTIVE DRIVE, SUITE 600 SAN DIEGO, CA 92121 PREPARED BY: SB&O, INC. 3990 RUFFIN ROAD, SUITE 120 SAN DIEGO, CA 92123 (858) 560-1141 SB&O JOB NO. 71470.60 Aaron Parker PE 6854 7 Exp: 9/30/2017 OCTOBER 20,2015 OCT 2 '1 2015 Corporate Office: 3990 Ruffin Road, Suite 120 • San Diego, California 92123 • Phone 858.560.1141 Fax 858.560.8157 41689 Enterprise Circle North, Suite 126 • Temecula, CA 92590 • Phone 951.695.8900 Fax 951.695.8901 ' _j . u 2 PLANNING ENGINEERING SURVEYING TABLE OF CONTENTS 1. INTRODUCTION ...................................................................................................................... 1 2. DESCRIPTION OF WATER SYSTEMS .................................................................................. 1 2.1 Existing Condition ................................................................................................................ 1 2.2 Proposed Private Water System ............................................................................................ 1 3. HYDRAULIC ANALYSIS ........................................................................................................ 2 3.1 EPANET ............................................................................................................................... 2 3.2 Residual Demand Analysis ................................................................................................... 2 3.3 Results .................................................................................................................................... 2 4. WATER METER SIZING .......................................................................................................... 3 4.1 UPC Demands ...................................................................................................................... 3 4.2 Meter Sizes ............................................................................................................................ 3 5. RECOMMENDATIONS ............................................................................................................. 3 5.1 Pipelines ................................................................................................................................ 3 5.2 Pressure Regulation .............................................................................................................. 3 5.3 Meters ................................................................................................................................... 3 EXHIBITS Exhibit A: Vicinity Map Exhibit B: EPANET Results I Site Map D:\71472 Quarry Creek\Reports\Water\20150514, QC-R3, WATER STUDY.xlsx.docx . u z PLANNING ENGINEERING SURVEYING 1. Introduction The Quarry Creek project is located in the City of Carlsbad (City), but is bordered to the east by the City of Oceanside. The project is situated west of College Boulevard, east of Interstate 5 and south of Haymar Drive. The property is divided north and south by the Buena Vista Creek which runs east to west across the middle of the site. Planning Area 3 (R-3) is located in the southeastern portion of the site, and consists of 88 two- story townhomes. R-3 is bound by the Buena Vista Creek to the north, Creekside Street to the west and Marron Road to the south. This report summarizes our analysis of the proposed domestic water system within R-3, for sizing of facilities and verifying adequate working pressures. This report is preliminary and may be revised due to changes that occur in the final design stage of the project. 2. Description of Water Systems 2.1 Existing Condition A water system analysis for the Quarry Creek Master Plan was prepared by Dexter Wilson Engineering, dated March 2012. The Quarry Creek water system is connected to the 580 pressure zone near the intersection of Tamarack A venue and Simsbury Court. A pressure reducing station reduces all the Quarry Creek main lines to 330 pressure zone. 2.2 Proposed Private Water System The R-3 area contains private streets, private sewer, and a private water system. The internal 6" PVC private main lines are looped through the site, and connected at two locations with master public water meters and backflow devices. The layout of the domestic water system and the Points of Connection (POCs) are illustrated in Exhibit A. Each building shall receive a single water service and each unit shall be individually sub-metered. No irrigation, fire hydrants or sprinkler systems shall be connected to the private potable water system. A parallel private 8" PVC private fire system shall be provided in a joint trench to provide service to fire hydrants and to building fire suppression systems. The private fire system shall also be looped through the site and be connected to an 8" Double Check Detector Assembly (DCDA) at the public right-of-way, at each of the two POCs. D:\71472 Quarry Creek\Reports\Water\20150514, QC-R3, WATER STUDY.xlsx.docx 1 . u z PLANNING ENGINEERING SURVEYING 3. Hydraulic Analysis 3.1 EPANET EPANET (v2.00.12) is a computer program that performs extended period simulation of hydraulic and water quality behavior within pressurized pipe networks. EP ANET can be used for many different kinds of applications in distribution systems analyses. A network consists of pipes, nodes (pipe junctions), pumps, valves, and storage tanks or reservoirs. EPANET tracks the flow of water in each pipe, the pressure at each node, and the height of water in each tank, throughout the network during the simulation period comprised of multiple time steps. 3.2 Residual Demand Analysis In accordance with the City's Design Requirements, Section 3 .2.1, the following demand profiles shall apply to the hydraulic analysis of the 88 residential multi-family units: Average Daily Demand (ADD)= 22,000 gallons per day (gpd) = 15 gallons per minute (gpm) Maximum Daily Demand (MDD) = 36,300 gpd = 25 gpm Peak Hour Demand (PHD)= 63,800 gpd = 43.5 gpm Per City's Design Requirements, Section 2.3, the minimum residual pressure shall meet the following criteria: A. 40 PSI at PHD B. 20 PSI at design fire flow plus MDD The private fire system is independent of the potable water system and therefore only scenario "A" (PHD) is hydraulically modeled. 3.3 Results The results of the analyses are summarized in the table below and Exhibit A. Please note that the initial reservoir numbers used in the study take into account a loss of approximately 7' of head from each meter and backflow device. (320ft H20)-(7ft Headloss) =323ft H20. SIMULATION ALLOWABLE Max. Velocity (FPS) 1.8 8 Hazen-Williams Roughness Coef. "C" 120 - Max. Residual Pressure (PSI) 87.9 - Min. Pressure (PSI) 78.7 40 D:\71472 Quarry Creek\Reports\Water\20150514, QC-R3, WATER STUDY.xlsx.docx 2 _j B&D~ PLANNING ENGINEERING SURVEYING 4. Water Meter Sizing 4.1 UPC Demands The demands for each unit and building were calculated based upon the amount of fixture units in each. Using chart A-2 (Appendix B) of the UPC, the fixture units are converted to flow demand in gpm. 88 TOTAL NO. OF UNITS 33 ASSUMED FIXTURE UNITS PER DWELLING UNIT 2,904 TOTAL FIXTURE UNITS . 420 TOTAL DEMAND (GPM) 4.2 Meter Sizes The private water system is looped to two points of connection with a demand of 210 gpm at each. A 3" water meter has a capacity of320 gpm and a 2" meter has capacity of 160 gpm for a total capacity of 480 gmp. 5. Recommendations 5 .1 Pipelines The on-site main lines within the project should be constructed with 6" PVC (C900 CL. 150) pipe or equivalent, and in accordance with the City's Water Design & Construction Manual. 5.2 Pressure Regulation This water system does not require any pressure regulators or reducers for the on·-site public water system. The individual buildings will require pressure reducers, to be determined by the building plumbing engineer. 5.3 Meters The domestic water system shall be looped and connected at two POCs with a 3" and a 2" public water meter at each location. Each on-site unit shall be sub-metered to track individual water usage. D:\71472 Quarry Creek\Reports\Water\20150514, QC-R3, WATER STUDY.xlsx.docx 3 Exhibit A: Vicinity Map £L CAMINO COUNTRY CLUB VICINITY lt{AP NOT TO SCALE THOMAS BROTHERS PG. 1107, GRID A-2 2006 EDmON D:\71472 Quarry Creek\Reports\Water\20150514, QC-R3, WATER STIJDY.xlsx.docx Exhibit B: EPANET Results & Site Map , ____ 1 D:\71472 Quarry Creek\Reports\Water\20150514, QC-RJ, WATER STUDY.xlsx.docx __ j Page 1 PM 10/19/2015 6:31:03 ********************************************************************** * E P A N E T * * Hydraulic and Water Quality * * Analysis for Pipe Networks * * Version 2.0 * ********************************************************************** Input File: R3 Domestic EPANET, UPC.net Link -Node Table: Link ID P1 P2 P3 P4 P5 P6 P8 P7 P9 Node Node ID J1 J2 J3 J4 J5 J7 J6 POC2 POC1 Results: Start Node J5 J1 J2 J3 J4 POC2 J7 JS J6 Demand GPM 21.00 5.00 8.00 12.00 42.00 0.00 0.00 -39.68 -48.32 End Node J1 J2 J3 J4 J1 J7 J2 J6 POC1 Head ft 322.68 322.69 322.68 322.68 322.68 322.73 322.77 323.00 323.00 1 Pressure psi 81.76 79.16 80.02 80.46 83.06 78,. 74 87.86 0.00 0.00 Length Diameter ft in 265 6 175 6 240 6 185 6 280 6 43 3 155 6 275 6 25 3 Quality 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Reservoir 0.00 Reservoir ' Link Results: Link ID P1 P2 P3 P4 P5 P6 P8 Flow VelocityUnit Headloss Status GPM fps ft/Kft 6.32 0.07 0.01 Open -19.18 0.22 0.06 Open 15.50 0.18 0.04 Open 7.50 0.09 0.01 Open -4.50 0.05 0.00 Open 39.68 1. 80 6.39 Open 39.68 0.45 0.22 Open 2 Page 2 Link Results: (continued) Link ID P7 P9 Flow GPM -48.32 -48.32 VelocityUnit Headloss fps ft/Kft 0.55 2.19 3 0.31 9.20 Status Open Open I I I a I ~ • • ..... lEGEND P.O. C. @ PRIVATE DOAIESTIC WATER (4• P.V.C. MAIN) PRIVATE FIR£ (s• P. V.C. MAIN) PUBUC MAIN (12• P.V.C.) INDIC4TES POINT OF CONNECTION INDIC4TES JUNCTION w .,,.. \ ~ (j d ~ (PUBliC) ( ) .. ~ ' • I ' ~ c: .2 ~ i .;.;. .... ~ ~ ti' t'lj ~ ~ .... ~ ~ t " ~ ~ ~ ~ WATEREXHBITFOR BB&JDU ~ ~ 10-20 1s OUARRY CREEK PLANNNG AREA R-3 i: ~ PLANNING ENGINEERING SURVEYING ~ " 71.illl7~An I PRESSURE ZONE = JJO I