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GEOTECHNICAL <br /> NEIL O. ANDERSON <br /> ENVIRONMENTAL <br /> AN D ASSOCIATES INSPECTIONS a TESTING <br /> LABORATORY SERVICES <br /> 2005 �R z 4. <br /> Y POOL ENGINEERING <br /> POST TENSION DESIGN <br /> Et�VtRD� �rq�NY <br /> April 21,2005 'Lei <br /> NOA Project Number: E04159A <br /> Transmitted by First-Class Mail and Fax: (209) 464-0138 <br /> Mrs. Lisa Medina, R.E.H.S.,Land Use Program <br /> San Joaquin County, Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202 <br /> RE: Addendum to Nitrate Study <br /> 13299 North Curry Avenue,Lodi, CA <br /> Land Use Application # PA-04-228 <br /> I Report Dated March 11, 2005 <br /> i <br /> Dear Ms. Media: <br /> Per your request,we have prepared this addendum to the above-referenced Nitrate Loading Study. <br /> Sections listed refer to the Requirements Checklist completed on March 31, 2005. <br /> 3.5: We regret that Plates 9 and 10 were not included in the report. The original plates,with the 45 <br /> mg/L-N (Plate 10) and the requested 65 mg/L-N (Plate 11), are attached to this letter. <br /> 3.6: With an Effluent Concentration (Nw) of 65 mg/L-N. The equation yields the following results. <br /> Table 1. <br /> Summary of Nitrate Mass Balance Analysis with an Nw of 65 m /L-N. <br /> Plate Result Acres Average Daily Effluent Leachfield Deep <br /> (Nc)* (A) Flow(Q) Concen- Denitrifi- Percolation of <br /> 4 (mg/L-N) (Table 3) tration(Nw) cation(d) Rainfall(R) <br /> 3 <br /> (gpd) r mg/L-N)—- (Plate 9) (in.) <br /> 10 10.2 7.55 780 65 15 6.84 - <br /> * Maximum contaminant level(MCL) for nitrate in drinking water is 10 mg/L-N. <br /> Basedon n ofrNw of 6 <br /> the assumptio5 mg/L-N,which.EHD. staff requested,Ithe_result fo the <br /> revisema <br /> d ss-balance_equation.yields-a-Nc 0.2.m <br /> It is our opinion that a concentration (Nw) of 65 mg/L-N maybe too conservative since winery <br /> waste water typically contains low levels of nitrates.Also, the waste water is a combination of the <br /> residential uses, the majority of the waste water, and the winery tasting room use. We believe the an <br /> Nw of 45 mg/L-N,yielding an Nc of 7.3 mg/L-N,reflects the average concentration of percolating <br /> effluent form the various sources over the site. We do not believe that the proposed development <br /> will cause a build up of nitrate in the ground water over 10 mg/L-N. <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,l..odi,California 95240 ■209.367.3701 ■ 209.369.4228 fax ■www.noandefson.com <br /> I <br />