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SANTOCHI & BRAVANTE LLC. <br /> ENVIRONMENTAL CONSULTANTS I' + ' <br /> TELEPHONE (714)644-2690 20 CORPORATE PLAZA <br /> FACSIMILE (714)644-2691 97 OCT 28 PH 12: 53 <br /> NEWPORT BEACH,CA 92660 <br /> October 22, 1997 <br /> Philip S. Isorena <br /> Associate Engineer <br /> Central Valley Regional Water Quality Control Board <br /> 3443 Routier Road Suite A <br /> Sacramento, California 95827-3098 <br /> Subject: RWQCB letter dated September 11, 1997 relative to Additional Phase H Assessment and <br /> request for closure at 222 North El Dorado,Stockton,and subsequent telephone conversation dated <br /> September 17, 1997. <br /> Dear Mr. Isorena: <br /> Per our conversation on the 17th of September,the following items were discussed. <br /> I <br /> ♦ American should perform four additional sampling events at the site,over the next four quarters. The <br /> reason for the required four additional rounds of sampling is to develop a history on the fourth well <br /> which was recently drilled. <br /> ♦ The first round of sampling should include Dissolved Metals,Volatile Organic Compounds(VOCs) <br /> and Semi Volatile Organic Compounds(SVOCs) along with Total Petroleum Hydrocarbon(TPH) <br /> gas/diesel ranges and Benzene,Toluene, Ethyl benzene and Xylene(BTEX). If metals/VOCs/or <br /> SVOCs are not detected in the first round of f sampling they will not be analyzed in the following three <br /> quarters. <br /> ♦ No additional soil borings or wells are deemed necessary at this site as the vertical and horizontal <br /> extent of soil contamination has been defined. <br /> ♦ If a stabilization of the current contaminant levels in groundwater is shown over the next four <br /> monitoring events this site will be considered for site closure. <br /> Should you have any questions or require further information,please feel free to contact me at(714)-644-2690. <br /> Sincerely, <br /> SANTOCHI&BRAV <br /> ( 91 <br /> �T <br /> ENGINEERM <br /> _ <br /> Trevor D. Santochi �` 0� cI q <br /> Z <br /> Principal <br /> t <br /> p s$�F nr Ir J" <br /> CC: Michael Infurna REHS`(San Joaquin County Env. Health) <br /> Mr. Brian Walker ASB <br />