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® RECEIVED NOV 04 2015 ENVIRONMENTAL HEALTH October 29,2015 PERMIT/SERVICES FOR: Mr. Rodney Estrada, REHS San Joaquin County Environmental Health Department(EHD) 1868 Hazelton Ave. Stockton,CA 95205 PROJECT: Mike Brown Project 4100 West Yosemite Avenue Lathrop, California 95330 SUBJECT: Soil Suitability/Nitrate Loading Studies Report Addendum INTRODUCTION Reference is made to the Studies conducted for the project listed above. Additional information regarding the proposed decentralized wastewater management(septic) system to be installed for this project has been requested by Mr. Estrada of EHD with regard to maximum use from potential future developments or improvements. As d11scussec(in m Report(Job No. 22-15),the treatment portion of the system to be installed consist of two -2,000 gallon septic tanks in series,each tank to be two compartments, with effluent gravity distributed through three leachlines within a 1,200 sq. ft(12 ft wide by 100 ft long) leachfield. It was originally proposed to dispose of effluent from the existing residential structure through this new system. It is now proposed to keep effluent from the residential structure on its own existing system. This change, discussed in the following Section, will affect the theoretical Average Daily Flow(ADF)and the Hydraulic Residence(also referred to as retention)Time(HRT)of both tanks calculated in the Studies. This change is then followed by a discussion of the absorptive capacity of the proposed filter bed disposal area. Finally, maximum use will then be estimated by referencing water use factors from the EHD Sewage Standards and flow rates from the 2013 California Plumbing Code(CPC). At present,the system proposed to be installed will manage effluent from a four-person mobile office building,referred to as a commercial coach by the San Joaquin County Building Department. CALCULATIONS AND DISCUSSION The EHD Sewage Standards and the California Plumbing Code are used in this Section to discuss the various criteria in reaching the goal of theoretically determining a maximum use of the subject property. The first criterion regarding maximum use begins with the proposed septic tanks. The HRT of the two tanks will be calculated separately instead of calculating the entire volume(4,000 gals) singularly. This is due to the probability that each tank will have separate and different sludge and scum accumulations. Detention Time Calculations: TDetention Time=2,000 gal proposed first tank capacity x 1-0.40(40%volume lost to sludge/scum accumulation) 1.5 (Peaking Factor)x 800 gpd Detention Time= 1.0 days. Page 1 of 2 P. O. Box 3794 • 7urrock, CA 95381 • Office (2o9) 668-i4o3 • Fax (tog) 668-2598