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LIVE OAK GEO ENVIRONMENTAL, INC_ <br /> 407 W_ Oak St., Lodi, CA 95240 .• (209)389-0375 ❖ logelodi.com <br /> � <br /> ��YED <br /> August 5, 2010 Alli 0 9 <br /> Transmitted by U.S. Mail and Fax: 464-0138 <br /> Project Number: 1013 ENVIRUIvivtt l�( HEAITH <br /> PE.Rt MSERVICES <br /> Mr. Mike Escotto <br /> San Joaquin County Environmental Health Department <br /> +600 E. Main Street <br /> Stockton, CA 95202 <br /> Regarding: Addendum to Soil Suitability/Nitrate Loading Study <br /> . ..---.-,._.� .A &-Calculation of Septic-Tank Capacity- <br /> PONDL Winery <br /> 665 W. Turner Rd, Lodi, CA <br /> PA-1000051 (SA) <br /> Dear Mr. 'Escotto, <br /> I am following up on our telephone conversation the other day regarding the Soil Suitability and <br /> Nitrate Loading Report for PONDL Winery, PA-1000051 {SA) located at 665 W. Turner Road, <br /> Lodi, CA, dated June 18, 2010. You had requested more information regarding the <br /> recommended septic tank size for the winery restroom. <br /> In the report recommendations (page 13, Item No. 4), 1 recommended an oversized septic tank <br /> :size(beyond the minimum size used in the Onsite Waste Water Disposal Standards by the San <br /> Joaquin County) to help mitigate nitrate levels in the septic wastewater. 1 did not provide the <br /> tank size at that time. <br /> AdditEonaily, in'discussing the tank size calculation, Mr. O Neill has brought it to my,attention <br /> that he plans to have only'two'6MOloyees onsite eaC daylirather•tl3�an th wfo� ur-discussed in <br /> the report;:this two-employee figure is consistent with his Planning application paperwork. 1 r� <br /> have revised the nitrate loading calculation to include only two employees, and the result is a <br /> -pre?dicf6d__fta im6ffi"buildup of nitrates'in'016 aquifer of 14.04 mg/L.=N.`This result exceeds the <br /> .maximum drinking water standard, ander rtigatlonAln the form of an oversized septic_system is <br /> still needed. <br /> The calculations to determine septic tank volumes are provided in the Disposal Standards. <br /> When the proposed use levels for the winery are applied, a Calculated Tank Capacity (CTC) of <br /> 1,660 gallons is required for the project. The calculation is as follows: <br /> Calculated Tank Capacity formula (San Joaquin County, Waste Water Disposal Standards) <br /> CTC = Calculated Tank Capacity, CTC = BTC + ADF <br /> BTC'= Base Tank Capacity, always 1,200 gallons <br /> ADF = Average Daily Flow from anticipated use of the facility <br /> Environmental 4- Engineering Geology Geophysics <br />