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Home My WebLink AboutGPA 11-09; Quarry Creek; General Plan Amendment (GPA)... ... -... - ... • ... • .. .. • .. - • -.. - v PRELIMINARY SEWER REPORT QUARRY CREEK Lots 1-16 October 2012 CT 11-04 Prepared For: Quarry Creek Investors, LLC 2750 Womble Road San Diego, CA 92106 PROJECT DESIGN CONSULTANTS Planning I Landscape Architecture Environmental i Engineering I Survey PDC Job No. 2468.00 701 B Street. Su•te 800 San Diego. CA 92101 619.235.6471 Tel 619.234.0349 Fax Greg M. Shields, Registration Expires RCE 42951 03/31/14 Prepared By: MW Checked By: GMS - .. ... ... --- -... -... - Report I. II. Ill . IV. Figures Tables Appendix Exhibit A Page 2 of7 TABLE OF CONTENTS Introduction .................................................................................................. . Project Description ....................................................................................... . Design Criteria .............................................................................................. . Conclusion .................................................................................................... . Page 3 3 4 4 Vicinity Map............................................................................................. 5 Sewer System Calculation Table 5-1 Unit Flow Generation Factors Sanitary Sewer Exhibit for Lots 1-16 R:\WPIREPORT\2400\2468_SEWER_REPORT_OCT-12.doc ... • - ... Jill -... - - • - -... --- • I. INTRODUCTION This report supports the preliminary design of the proposed sewer improvements associated with Quarry Creek, (Project). The project is located in the City of Carlsbad and is bound generally by State Route 78/Haymar Drive to the north, undeveloped land to the west, City of Oceanside boundary to the east, and Calavara Hills to the south. The total project site consists of 155.38-acres of gross project area. Figure 1 shows the vicinity map for the project. II. PROJECT DESCRIPTION Page 3 of7 The proposed project includes mass grading pads and supporting public roadway infrastructure for the future development of 656 market rate residential units (Lots 1 thru 5), parks (Lot 6, 8 thru 11 ), community facility (Lot 7) and open space (Lots 12 thru 16) on approximately 155.38 acres. As part of the proposed sewer improvements, the City of Carlsbad will be installing a new sewer main in Simsbury Court and abandoning the existing Simsbury sewer lift station. The project will provide a sewer main extension from Street A to the right-of-way Simsbury Court through Lot 14 (see Exhibit A) . A portion of the existing development to the south, Calavara Hills, is currently being sewered by a lift station (Simsbury Lift Station) located in Simsbury Court (see Dwg. 244-3). With development of the Quarry Creek project, the City of Carlsbad will propose to abandon the Simsbury Lift Station and connect to the public sewer system in Quarry Creek. The existing Simsbury sewer EDU's (designated as tributary area 7A) is 608 EDU and is included in this sewer analysis. The City's 2012 Sewer Master Plan update has determined that it is not cost effective to direct the sewer flows from the Villas Lift Station to Quarry Creek and is therefore not included in this sewer analysis. The existing commercial development to the east, within the City of Oceanside, currently sewers through a private sewer lift station in Marron Road (Dwg. R12045). It pumps wastewater back to College Blvd. and City of Oceanside sewer system. With development of the Quarry Creek project, the Marron Road sewer lift station could be abandoned, provided a flow exchange agreement is approved between the Cities of Vista, Carlsbad and Oceanside. If the agreement is approved, then Oceanside will be allowed to connect to the proposed public Carlsbad sewer in Street "A". The project will provide a sewer main up to the existing 8-inch sewer stub in Marron Road, but will not connect until the agreement is in place. The existing sewer EDU's generated from the commercial property (Marron Road lift station) to the east and the future community facility area east of Lot 1 are included in this sewer analysis for conveyance capacity verification . The proposed public backbone sewer system for Quarry Creek will be located in Streets "A", Street "B" and through Lot 11 and will connect into the existing 36inch-Buena Vista Creek sewer main in Haymar Drive to the north. As Street "B" crosses the Buena Vista Creek, a vehicular bridge will be constructed. The proposed sewer main in Street R:\WP\REPORT\2400\2468_SEWER_REPORT_OCT-12.doc • III. - • ... • IV. - -... - Page 4 of7 "B" will be suspended on the bridge. The proposed sewer main will not encroach into the 100-year water surface elevation (See Sheet 9 ofCT 11-04). The proposed project proposes to connect into MH#32 per City of Vista D-1981. Since the project connects into the VC-1 segment, the City of Carlsbad and the City of Vista will need to enter into an agreement and/or some other form of approval in order for Carlsbad to obtain capacity rights to connect into the VC-1 segment owned by City of Vista. DESIGN CRITERIA Using the Unit Flow Generation Factors (Table 5-1, located in Appendix 1 ): I. Existing Simsbury EDU from the Simsbury Lift Station is 608 EDU's 2. Existing EDU from Marron Road is 203 EDU's (based on the conversion factor of I EDU per 1,800 square feet of building-existing 364,000s.f. of building) 3. Proposed EDU from Lots I thru 5 generate 656 EDU's (based on the proposed number of units) 4. The proposed parks and community facilities lots (Lots 7 and 8) generate 33 EDU's (based on the conversion factor of 40% improved pads to square feet of building and 1 EDU per 1,800 square feet of building) 5. Potential for sewer services to Oceanside parcel east of Lot 1 subject to approval by the City of Carlsbad generate 11 EDU's (based on the conversion factor of 40% improved pads to square feet of building and 1 EDU per I ,800 square feet of building) The proposed EDU generated by the Quarry Creek project, and surrounding commercial and residential developments is 1,511 EDU's . CONCLUSION In conclusion, it was determined that the proposed eight to twelve inch mains in Streets A and B, are suitable to carry the proposed sewer flows. A minimum of 2 fps velocity has been achieved (see Table 1 ), with pipes less than Yz Did. R:IWPIREPORT\2400\2468_SEWER_REPORT_OCT-12.doc - .... ... .. -.. -.. """ -----... .. -• .. • • • • • ------ ""' -Page 5 of7 -- Figure 1: Vicinity Map EL CAMINO COUNTRY CLUB ~ ~ MIRACOSTA C5 COLLEGE PROJECT SITE VICINITY MAP NO SCALE R:\WPIREPORT\2400\2468_SEWER_REPORT_OCT-12.doc • I • Sewer Svstem Design Flows and Calculation -.. • '"" • 1W .. -• """ • IIIII! 111111 ,,. .. "" .. '"" Page6of7 R.\WP\REPGRT\2400\2468_SEWER_REPORT_ OCT -12 doc IIIII .... • - <IIIII ... .. ,_ '"'" ... '- .. '"' ... -... .. • - • ... • ""' -.. - ""' • .. • Page 7 of7 APPENDIX I UNIT FLOW GENERATION FACTORS Geaeral To ~ocncrt Equivalent Dwclliag Units to flow auume 220 aalloas per da.yavera&e now. Commercial Propet1.J To convert raw land to square feel ofbuildiag space assume 30 percent covc:ra&e. To convert improved pad1 to square feet of building apace assume .(0 percent 'coverage. To coo vert square feet or a building to Equivaleot Dwellin& Uaiu assume J.soo·aqaarc feet per EDU. Iadnstrial Property To coa"en raw bnd to square feet of building 3pacc :usume 30 percent coverage. To convert ~mprovcd pads io square feet of building space ~ssume 40 percent coverage • To convert square feel of building to Equivalent Dwelling Units assume 60 .percent of space is w<Lrcbouse and 40 percent i:s office. Por warehouse Jpaee 5,000 square feet equals one EDU aod for office 1,800 squ.:uc: feel equab oac EDU • City of Carlsbad -Unit Flow Generation Factors R:\WP\REPORT\2400\2468_SEWER_REPORT_OCT·l2,doc