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15999 W CORRAL HOLLOW RD Project No.2019-00027 Page 17 <br /> 4.4 Future On-Site Sources of Nitrate <br /> 4.4.1 Quantity and Quality of Domestic Wastewater from Proposed Project <br /> The following discussion is for determining the long-term wastewater flow anticipated from the <br /> planned site use, to be incorporated into the nitrate loading analysis. The anticipated wastewater / <br /> flow determined is not intended to be used for septic system design, because septic system sizing !/ <br /> includes a peak use factor. whereas the numbers discussed herein are based on a long-term <br /> conservative measure of estimated effluent volume. <br /> The property currently consists of one large parcel located at 15999 W Corral Hollow Rd.,Tracy CA <br /> and is 5753.40 acres. Proposed "development" consists of a commercial onsite wastewater <br /> treatment system for the T8021 Office located at the Site 300 Test Facility,which will accommodate <br /> Vup to 20 individuals, 4 days a week, for 10 hours a day. Lawrence Livermore National Laboratories <br /> (LLNL) is currently expanding its workforce and needs additional office space. To be conservative, <br /> we have assumed use of the site at 7 days a week,with 20 total individuals per day. <br /> The San Joaquin County On-site Wastewater Disposal Standards indicates that for an Industrial Office <br /> of this type that an appropriate use rate is 15 gallons per day per person. In addition, we have <br /> included existing onsite flow rates for the other 33 buildings/systems. The total flow values used <br /> were developed from existing data for the site as developed for permitting under the Regional Water,�'�J <br /> Quality Control Board Permit Waste Discharge Requirement Order No RS-2008-0148.Specific details <br /> relating the site use values can be reviewed at https://www.waterboards.ca:govlcentralvalleyl <br /> board decisions/adopted orders/alameda/r5-2008-0148.pdf.The summary table from that report <br /> is attached as Appendix B. <br /> The following table presents the nitrate contributing septic wastewater flowrates anticipated for the <br /> site based on our careful examination, professional judgement, and experience with similar site <br /> conditions. <br /> Table 3. <br /> Typical Quanti of Effluent <br /> Average <br /> Total Days of <br /> Quantity Average Daily Flow <br /> Category People per per Person Use per per Facility <br /> Day (gal) Year <br /> Industrial Office 20 15* 365 (20 people x 15 gal x 365 <br /> days)/365 days=300 gal <br /> Existing 33 N/A 2,266** 365 (2,266 gal x 365 days) /365 <br /> Facilities** days=2,266 gal <br /> *Based on the SJC OWTS Standards 1/2017. <br /> **Based on the values developed as part of existing system review at LLNL for the Regional Water Quality Control Board <br /> Permit Waste Discharge Requirement Order No R5-2008-0148.Attached as Appendix B. <br /> TOTAL AVERAGE GALLONS PER DAY-COMMERCIAL USE 2,566 gallons <br /> Petralogix Engineering,Inc. <br /> 26675 Bruella Road,Galt,Ca 95632 <br /> (209)-400-5729 <br /> WWW.petralogix.com <br />