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GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> A N D A S S O C I A T E S INSPECTIONS & TESTING <br /> FO) <br /> ' LABORATORY SERVICES <br /> L POOL ENGINEERING <br /> AUG 2 0 2004 POST TENSION DESIGN <br /> August 18, 2004 <br /> NOA Project Number: E04069A ENP RM�M N'I_ h ES H <br /> Transmitted by Facsimile and First-Class Mail <br /> Mr. Mike Huggins <br /> San Joaquin County, Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE: Addendum to Soil Suitability Study <br /> 149 West Woodbridge Road, Woodbridge <br /> Land Use Application#PA-04-105 <br /> Service Request #SR0038483 <br /> Report Dated June 16, 2004 <br /> Dear Mr. Huggins: <br /> Pursuant to your letter dated August 4, 2004, we have prepared this addendum to the above- <br /> referenced Soil Suitability Study. Sections listed refer to the Requirements Checklist completed <br /> on July 22, 2004. <br /> 4.1 & 4.2: We believe you are suggesting that the round water gradient across the Site will be �? <br /> Y gg g g <br /> steep because of the adjacent ground water recharge area. The ground water data referred to in <br /> our report is regional and cannot be used to predict an exact gradient across the Site. However, <br /> we have typically found that geological layers of low permeability separate shallow ground water <br /> from the deeper aquifers tapped by drinking water wells. <br /> 5.4 & 6.7: In the past, EHD staff have suggested that filter bed systems are appropriate for t <br /> situations involving rapid percolation rates and sandy soil conditions. We understand from these <br /> discussions that the growth of a biological mat and film will develop and greatly reduce the <br /> percolation rate. We believe that a filter bed system will be appropriate for this site when coupled <br /> with the recommendation below. <br /> 6.7: We agree with your suggestion that the septic tank size should be enlarged above the <br /> minimum requirement for the proposed residence. The enlarged size will increase eluent <br /> retention time, which should result in a reduced impact to ground water. Specifically, we <br /> recommend using the next larger tank size above the EHD Onsite Waste Water Disposal <br /> Standards. For example, a one to three bedroom house should use a 1,600-gallon tank instead of <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 ■209.367.3701 ■ 209.369.4228 fax ■www.noandersonxom <br />