MENIFEE VALLEY CAMPUS MASTER PLAN DRAFT EIR MT. SAN JACINTO COMMUNITY COLLEGE DISTRICT. Appendices

Transcription

1 MENIFEE VALLEY CAMPUS MASTER PLAN DRAFT EIR MT. SAN JACINTO COMMUNITY COLLEGE DISTRICT Appendices Appendix J Utility Systems Data February 2017

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8 Domestic Water System The existing on-site domestic water supply system at the Menifee campus is supplied by the Eastern Municipal Water District (EMWD). The campus is serviced by a 12 water service that tee s off a public 30 water main at La Piedra Road. This 12 service branches into a 6 domestic water main and a 10 fire protection water main. A 4 water meter, backflow preventer, and pressure reducing valve are located at the right-of-way. The 6 domestic water supply main is presumably PVC C900 CL150 pipe in accordance with EMWD standards. The domestic water supply system shall be designed and constructed in accordance with EMWD s Water System Planning & Design, Principle Guidelines Criteria dated July 2, For flow demand calculations, the guidelines recommend the following for Institutional use: Average Day Demand (ADD) = Maximum Day Demand (MDD) = Peak Hour Demand = Peak Hour Flow = 3,000 gpd / acre 4,500 gpd / acre (ADD x 1.5 peaking factor) 6,000 gpd / acre (ADD x 2.0 peaking factor) 50 psi min, 125 psi max, 10 fps max. Domestic water mains 4-inches and larger shall be PVC C900 DR18 (CL150). Domestic water service laterals larger than 2-inches shall be PVC, and service laterals 2-inches and smaller shall be Type K soft copper. J-6

9 ALBION LANE ANTELOPE ROAD LA PIEDRA ROAD (N) PERFORMING ARTS J-7 LEGEND 1" = 200' November 2016 DOMESTIC WATER EXHIBIT - PHASE 1 Menifee Valley Campus Mt. San Jacinto Community College District La Piedra Road Menifee, CA 92584

10 ALBION LANE ANTELOPE ROAD LA PIEDRA ROAD (N) PERFORMING ARTS J-8 LEGEND 1" = 200' November 2016 DOMESTIC WATER EXHIBIT - FULL BUILDOUT Menifee Valley Campus Mt. San Jacinto Community College District La Piedra Road Menifee, CA 92584

11 = Fire Water System The existing on-site fire protection water supply system at the Menifee campus is under the jurisdiction of the Riverside County Fire Department, and is supplied by the Eastern Municipal Water District (EMWD). The campus is currently serviced by a 12 water service that tee s off a public 30 water main at La Piedra Road. This 12 service branches into a 6 domestic water main and a 10 fire protection water main. An 8 detector check valve is located at the right-of-way. The 8 fire water supply main is presumably PVC C900 CL150 pipe in accordance with EMWD standards. The project proposes to tap off the 10 private water main that currently exists on campus. To create a looped system, the project also proposes to tap off an existing 24 public water main located on Antelope Road on the west side of the campus. The fire protection water supply system shall be designed and constructed in accordance with EMWD s Water System Planning & Design, Principle Guidelines Criteria dated July 2, For fire calculations, the guidelines require the following minimum fire flow standards for school use: Fire Flow (minimum required) = Max. Day Demand (MDD) + Fire Flow = 1, psi, 2 hour duration 20 psi min, 10 fps max (assumed) Modeling of the fire protection pipe system networks was performed using the EPANET computerized simulation model developed by the United States Environmental Protection Agency dated September The only fire flow test results available were provided by the District for an on-site fire hydrant located adjacent to building 700 as follows: Static Pressure: 94 psi Residual Pressure: 74 psi Hydrant Pitot Flow: 1,130 gpm Target Pressure: 20 psi Calculated Equivalent Flow: 2,291 gpm Two simulations were performed. Each pipe segment included a roughness coefficient of 140 for PVC pipe, and a loss coefficient of 1.50 to account for 90-degree bends. Each of the backflow preventers included a loss coefficient of 2.0. The first simulation modeled the existing system to estimate the water pressure at the public right-ofway. An input of 1,130 gpm at the end of the system determined that a total head of 203 feet at the upstream end resulted in a pressure of 74 psi at the downstream end which is consistent with the above flow test results. A second model simulation was then performed considering the full build-out system with 203 feet of pressure head provided at the service connections points. The model was then run for select nodes considering a flow demand of 1,500 gpm at 2 hour duration, and in each case the water pressure maintained approximately 80 psi which far exceeds the minimum required 20 psi. Also, the velocity of flow in each pipe segment does not exceed 10 fps (except at the hydrant leader itself). On-site fire water pipe material will be PVC C900 DR18 (CL150). Fire water services to each building will include a fire department connection (FDC), Post Indicator Valve (PIV) and check valve. FDC s shall be a minimum of 40-feet away from buildings and within 40-feet of a fire hydrant. Beyond the FDC, water pipe material will be PVC C900 DR14 (CL200). J-9

12 ALBION LANE ANTELOPE ROAD LA PIEDRA ROAD (N) PERFORMING ARTS J-10 LEGEND 1" = 200' November 2016 FIRE WATER EXHIBIT - PHASE 1 Menifee Valley Campus Mt. San Jacinto Community College District La Piedra Road Menifee, CA 92584

13 ALBION LANE ANTELOPE ROAD LA PIEDRA ROAD (N) PERFORMING ARTS J-11 LEGEND 1" = 200' November 2016 FIRE WATER EXHIBIT - FULL BUILDOUT Menifee Valley Campus Mt. San Jacinto Community College District La Piedra Road Menifee, CA 92584

14 = Sanitary Sewer System The existing on-site sanitary sewer system at the Menifee campus is a private gravity feed system. The existing campus buildings are plumbed to a network of 6 sewer pipes that ultimately tie into an 8 main at the north end of the campus. This private system drains to a public off-site system serviced by the Eastern Municipal Water District (EMWD). On-site sewer pipe material is presumably PVC. A preliminary analysis of the capacity of the on-site sanitary sewer system was performed as noted below considering the existing campus facilities as well as those proposed for full build-out. This analysis is limited to the on-site sewer system. Since existing off-site sewer flows are not known, this report is unable to ascertain the impacts, if any, to the existing public sewer system. In addition to the existing on-site sewer system that services the campus, there is also a public 12 sewer pipe main that crosses the campus in a 40 wide easement along the east side of the property. It is proposed that this sewer line and easement be re-routed further eastward to facilitate development of the proposed athletic fields. The capacities of the existing and proposed sewer pipes were analyzed in accordance with EMWD s Sanitary Sewer System Planning & Design, Principle Guideline Criteria dated 9/1/2006 using an Excel spreadsheet. The amount of existing and proposed sewer flows were based on the number of full-time equivalent (FTE) students plus staff, building square footages, and EMWD s guidelines which specifies an average daily flow of 20 gallons per student per day for schools. Assuming 3,000 existing FTE students plus 150 existing staff, and 4,400 new FTE students plus 220 new staff, this produces the following sewer-related data: Total Building Square Footage: 200,733 sf (existing)* + 370,418 sf (new) = 591,161 sf Total Number of Students and Staff: 3,150 (existing) + 4,620 (new) = 7,770 FTE Total Wastewater Flows: 0.16 mgd mgd = 0.49 mgd * - The existing Admin/ Classroom building is on a separate sewer service, and is therefore not included in the calculation: 200,733 sf (existing) + 20,010 sf (Admin/Classroom) = 220,743 sf (total existing). In accordance with EMWD guidelines, an air gap must be maintained along the top of the sewer flow to convey sewer gases downstream. Therefore, for sewer pipes less than 15 in diameter, the depth of wastewater flow shall not exceed one-half the depth of the pipe. The resulting calculations are presented on the attached spreadsheets. It appears the original overall plan for the campus sewer system included a point of connection at an existing 8 pipe near building 100 on the north side of the campus. Considering only the existing sewer system (prior to adding any new buildings), it is estimated that the depth of flow within the existing 8 pipe is already approximately 74.3% which exceeds the maximum allowable 50% threshold. Therefore, since this pipe appears to already exceed capacity, it is the recommendation of this report to not connect the new sewer system to the existing. The next option considers a point of connection at the existing 12 pipe near the east side of the property. The calculations indicate that this is a viable option, however in regards to the existing 12 public main, since the existing flows are unknown, it is unknown what impact, if any, the new flows would have on the existing 12 main. But since a 12 main has significantly more capacity than an 8 pipe, this second option appears more viable than the original option. J-12

15 Project: Mt. San Jacinto College, Menifee Valley Campus by: LPA, Inc. Menifee, CA 5161 California Ave, Suite 100 Irvine, CA Manning: Calc'ed by: Philip Herzer SANITARY SEWER CAPACITY CALCULATIONS FULL BUILDOUT (a) Educational 20 gal / student / day (b) (c) (d) (e) (f) (g) (h) (i) (j) (k) (m) (n) (o) (p) (q) (r) (s) (t) (u) (v) (w) Facility Sewer Node (Upstream) Sewer Node (Downstream) Square Footage Area of Facility (1000 sf) Occupant Load Factor Number of Full Time Equivalent Students, Faculty and Staff Average Flow Cumilative Average Flow Peaking Factor Peak Design Flow Pipe Diameter Pipe Length Pipe Slope Flow Capacity of Pipe (Flowing Full) Ratio of Peak Flow vs Flow Capacity of Pipe Percentage of Depth of Flow in Pipe (50% for 12" and under, 75% for 15") Velocity at Low Flow for Self-Cleaning (2 ft/s min.) Invert Elev (Upstrea,) Invert Elev (Downstream) Rim Elev (Upstream) Invert Depth of Structure (Upstream) A E (ksf) O LF FTES Q E (mgd) SQ (mgd) F PEAK Q P (mgd) d (in) L (ft) S (ft/ft) Q F (mgd) Q P/Q F y/d v (ft/s) Inv (ft) Inv (ft) Rim (ft) H (ft) h (ft) Pipe Cover Student Services Parking Structure Multi-Discipline Instr Parking Structure Performing Arts Field House (A) Student Center Math & Science (A) Math & Science (B) Math & Science (C) Math & Science (D) Allied Health Campus Police/ Maint Gymnasium/ Fitness Field House (B) % % % % % % % % % % % % % % % % % % % % % % % % % % % % Point of Connection % Child Development 600 Fine Arts 400 Humanities 800 Learning Center 500 Allied Health/ Nursing 900 Business / Tech 260 Utility Bldg 250 Bookstore 200 Music / Lounge 300 Classrooms/ Labs 100 Student Services 3000 Admin, Classrooms Total Existing Bldgs (Separate sewer service) E3 E , E2 E % Total: sf 7,770 students mgd (a) Facility designation per Full Buildout Plan, Menifee Valley Campus. (m) Length of each pipe run segment. (b) Upstream sewer node of the individual run. (n) Slope of each pipe run segment. (c) Downstream sewer node of the individual run. (o) The flow capacity of the pipe: Q = (0.464/n)(d/12) 8/3 S 1/2 (dividing by a factor of (d) Square footage of each educational building attributed to each sewer node. converts cfs to mgd). Mannings n = is used for sizing pipes in accordance with (e) Existing Campus EMWD standards. Based on 3,000 FTE (full time equivalent) students plus 150 staff, and 200,733 sf of building space (p) The ratio of the peak design flow, Q P, and the flow capacity, Q F, used to determine (excluding Admin Bldg), Occupant Load Factor is 15.7 Students/ Staff per 1,000 square feet of bldg space. the depth of flow in the pipe per (q). New Campus (q) Referring to the attached table "Open Channel Flow - Table of Circular Based on 4,400 FTE (full time equivalent) students plus 220 staff, and 370,418 sf of building space, Channel Ratios", the value Q D/Q F is used to determine the depth of flow Occupant Load Factor is 12.5 Students/ Staff per 1,000 square feet of bldg space. in the pipe for open channel conditions. In accordance with the Eastern Municipal (f) Estimated number of students or occupants per building, S = A E x 1000 / O LF Water District's Sanitary Sewer Design guidelines, the depth of flow shall be limited (g) The Average Daily Flow for Schools based upon 20 gallons per day per student in accordance to 0.50 for 12" pipe or less, and 0.75 for 15" pipe. with Table 1 of the Eastern Municapal Water District's Sanitary Sewer Design guidelines. (r) Check for minimum scouring velocity of 2 fps: v = (1.49/n) (r H) 2/3 S 1/2 where r H is For parking garages, sewer is needed for drainage from standpipe system estimated to be is the hydraulic radius. 44 gpm = mgd average flow. (s) Invert elevation of the upstream node structure. (h) Cumulative average flows. (t) Invert elevation of the downstream node structure. (i) Peaking Factors per Table 2 of the Eastern Municipal Water District's Sanitary Sewer Design (u) Manhole rim or inlet grate elevation at the upstream node (approximated from Grading guidelines. Plan) (j) The peak flow, Q P = Q A F PEAK used for design. (v) Depth of the manhole or inlet structure. (k) Inside pipe diameter for each run. (w) Burial depth (measured from surface grade to top of pipe). J-13

16 ALBION LANE ANTELOPE ROAD LA PIEDRA ROAD (N) PERFORMING ARTS J-14 LEGEND LEGEND LEGEND 1" = 200' November 2016 SANITARY SEWER EXHIBIT - PHASE 1 Menifee Valley Campus Mt. San Jacinto Community College District La Piedra Road Menifee, CA 92584

17 ALBION LANE ANTELOPE ROAD LA PIEDRA ROAD (N) PERFORMING ARTS J-15 LEGEND 1" = 200' November 2016 SANITARY SEWER EXHIBIT - FULL BUILDOUT Menifee Valley Campus Mt. San Jacinto Community College District La Piedra Road Menifee, CA 92584

18 Electrical System Electrical power is supplied to the campus by Southern California Edison (SCE). Existing distribution switchgear is located in a small utility building at the north-central area of the campus. The utility building is surrounded by existing campus development with a duct bank routed to the east for future expansion. The primary service is delivered from an SCE vault at the west side of campus adjacent to Antelope Road. The SCE primary feeder runs from the vault to the campus main switchboard MSB in the utility building. The MSB is sized for the existing campus buildings with marginal capacity for expansion. The switchgear has only one circuit breaker bucket available for an expansion. Power is distributed through the campus by underground duct banks at 12KV. Existing buildings are served from a central distribution spine with two runs north to south from the MSB. A new main switchboard MSB2 is proposed to be located at the north side of campus in the vicinity of the proposed campus police building. MSB2 will be served from the same SCE vault at Antelope Road through existing conduit duct banks. MSB2 will back feed the existing switchgear MSB which will remain in service, with minimal disruption to the electrical service to the buildings. As an option, a circuit and feeder from the new MSB2 can be provided to serve the loads on the existing switchboard with the removal of the swtich board once the new infrastructure is in place. Based upon the existing and proposed square footage of the buildings, MSB2 will be sized as follows: MSB back feed: 138,000SF Buildings New Campus 218,600 SF Total Proposed Campus Power 2.0MW power; 100A at 12KV 3.3MW power; 160A at 12KV 5.3MW power; 255A at 12KV The new MSB2 will have multiple feeder breakers to radial feed the site, such as a east feeder and south feeder. The back feed circuit will be the north feeder. Telephone service is also found near the SCE service vault at Antelope Road with conduit duct bank routed to the existing utility building. Cable TV service is found at the north along La Pierdra Road, with a service duct bank routed to the utility building. There is a duct bank that parallels the power spine to the east, with the intention of supporting future expansion. Similar to the power duct bank, this low voltage spine terminates in a pull box at the north east parking lot. This spine will be extended and routed down the east side of the site in support of the new buildings. The low voltage systems will be routed in parallel with the power duct bank to the south and then west to cover all new expansion on the campus. J-16

19 ALBION LANE ANTELOPE ROAD LA PIEDRA ROAD (N) PERFORMING ARTS J-17 LEGEND 1" = 200' November 2016 ELECTRICAL EXHIBIT - PHASE 1 Menifee Valley Campus Mt. San Jacinto Community College District La Piedra Road Menifee, CA 92584

20 ALBION LANE ANTELOPE ROAD LA PIEDRA ROAD (N) PERFORMING ARTS J-18 LEGEND 1" = 200' November 2016 ELECTRICAL EXHIBIT - FULL BUILDOUT Menifee Valley Campus Mt. San Jacinto Community College District La Piedra Road Menifee, CA 92584

21 ALBION LANE ANTELOPE ROAD LA PIEDRA ROAD (N) PERFORMING ARTS J-19 LEGEND 1" = 200' November 2016 TELECOMMUNICATIONS EXHIBIT - PHASE 1 Menifee Valley Campus Mt. San Jacinto Community College District La Piedra Road Menifee, CA 92584

22 ALBION LANE ANTELOPE ROAD LA PIEDRA ROAD (N) PERFORMING ARTS J-20 LEGEND 1" = 200' November 2016 TELECOMMUNICATIONS EXHIBIT - FULL BUILDOUT Menifee Valley Campus Mt. San Jacinto Community College District La Piedra Road Menifee, CA 92584

23 Gas System Gas service is provided to the campus by Southern California Gas Company (SCG). The existing medium pressure gas service (5PSI) on campus serving existing buildings will remain protected in place. A new medium pressure gas system will be installed to accommodate the new buildings on campus. As SGC field planner will be called out to the site in order to determine if the existing meter can handle the future loads from the new buildings. If the existing meter is unable to handle the new load the field planner shall upgrade the meter for a higher capacity. If it is determined that a new meter will be needed, a new address will need to be provided to SCG. This address can be as simple as adding a B to the current address i.e., B La Piedra Road. A letter from the City of Menifee will be required by the SGC confirming the acceptance of the new address before a new meter is installed. A new 5PSI gas system will be installed and routed to each of the new buildings. Gas main piping will likely be 3 or 4 polyethylene. Main building shutoff cocks shall be provided below grade in concrete yard boxes before the gas enters each building. 5PSI medium pressure gas piping shall be routed into each building distributed in the ceiling space of the highest floor of each building. Point-of-use gas pressure regulators shall be provided at rooftop mechanical units reducing the pressure down to standard 8 water column and connected to the units with shutoff cocks, dirt legs and flexible connections. For gas requirements inside the buildings such as water heaters, kitchen equipment, etc., medium pressure gas piping shall be routed to the roof over the areas in the buildings that require gas. The gas will then go through a rooftop gas pressure regulator reducing the pressure to standard pressure. Standard pressure gas piping shall then be routed down through the roof and to the pieces of equipment that requires gas J-21

24 ALBION LANE ANTELOPE ROAD LA PIEDRA ROAD (N) PERFORMING ARTS J-22 LEGEND 1" = 200' November 2016 GAS SYSTEM EXHIBIT - PHASE 1 Menifee Valley Campus Mt. San Jacinto Community College District La Piedra Road Menifee, CA 92584

25 ALBION LANE ANTELOPE ROAD LA PIEDRA ROAD (N) PERFORMING ARTS J-23 LEGEND 1" = 200' November 2016 GAS SYSTEM EXHIBIT - FULL BUILDOUT Menifee Valley Campus Mt. San Jacinto Community College District La Piedra Road Menifee, CA 92584