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1117 Lone Palm Avenue, Suite 1 <br /> V rc <br /> Modesto, CA 95351 <br /> www.m Avenue, cite B <br /> 209-579-2221 <br /> A S S O C I A T E S I N c . Fax 209-579-2225 <br /> U'ronmental,Geotechnical and Materials Engineers <br /> concentrations detected in the groundwater samples collected from JLM5 and JLM13 both increased <br /> and decreased with respect to the previous sampling event. The changes in petroleum hydrocarbon <br /> concentrations in the samples collected from JLM3, JLM4, JLM5, and JLM12 are insignificant. The <br /> groundwater sample collected from JLM13 exhibited the greatest change in petroleum hydrocarbon <br /> concentrations. TPHg and BTEX concentrations in the groundwater sample collected from JLM13 <br /> increased, and the 1,2-DCA concentration decreased with respect to the previous sampling event. <br /> The lateral extent of the groundwater plume appears to be adequately defined. Petroleum <br /> hydrocarbons were not detected in any of the perimeter wells, with the exception of JLM12 in the <br /> northwestern portion of the site. MTBE was detected below the maximum contaminant level (MCL) <br /> in the groundwater sample collected from JLM12 in March of 2006. The average groundwater <br /> elevation at the site increased approximately 3.3 feet since November 2005. <br /> Pursuant to a directive from the CRWQCB, ATC is in the process of preparing a workplan for <br /> additional subsurface investigation activities. <br /> Please contact our office at(209) 579-2221 if you have any questions or comments. <br /> Respectfully submitted, <br /> ATC Associates Inc. <br /> Todd Hainer,P.G. "W. <br /> w <br /> Professional Geologist <br /> J t7t! +1 w F y{ <br /> v .* <br /> j ` , ry"3rsi'es <br /> Jeanne Homsey, P.E. <br /> CA Registered Civil Engineer No. 47410 <br /> cc: Ms. Eugenia Valdez, J&L Market <br /> Mr. Mike Infurna, SJCEHD <br /> • <br /> s:\mvirommtal\28589\reporls\2006 IQR.doe 4 <br />