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San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> PpUIN Environmental Health Department ASSISTANT DIRECTOR <br /> r <br /> o c°Z 600 East Main Street Laurie Cotulla,REHS <br /> �. Stockton, California 95202-3029 <br /> pROGRAM COORDINATORS <br /> 4 , Carl Borgman,REHS <br /> _ Mike Huggins,REHS,RDI <br /> P • Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> q�ikoRc' Phone: (209) 468-3420 Robert <br /> rruescicn,REHS <br /> Fax: (209) 464-0138 Jeffey Foley,R RENS,RDI <br /> Kasey Foley,REHS <br /> November 13, 2008 <br /> Raymond Greer Albert &Wanda Veldstra <br /> Raymond Greer Construction 15634 Steinegul Road <br /> 1601 Cabrillo Court Escalon, CA 95320 <br /> Modesto, CA 95355 <br /> Subject: Former Greer Construction Site Code: 2021 <br /> 15634 Steinegul Road <br /> Escalon, CA 95320 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Work Plan <br /> to Conduct Verification Soil Sampling, Ozone Bench Testing and Vertical Groundwater <br /> Evaluation (Work Plan) dated October 24, 2008, submitted on your behalf by ATC <br /> Associates, Inc. (ATC) and has the following comments. <br /> This site has been undergoing remediation by soil vapor extraction since September 2005. <br /> To verify the effectiveness of the system, ATC proposes to collect soil samples from areas of <br /> previously documented contamination in the soil. One soil boring, SB-1 is proposed to be <br /> located between former borings B-1 and B-2, and one will be advanced near CPT-6 and later <br /> converted to a deep groundwater monitoring well (MW-10). The EHD approves the proposed <br /> confirmation borings with the condition that the SB-1 is located within three feet of former <br /> boring B-1 to have more comparable 'before and after' samples, and that soil samples for <br /> analysis are collected from each boring to total depth 70 feet below surface grade (bsg). The <br /> EHD does not recommend using a Geoprobe for this work. Geoprobes have limitations and <br /> may not reach the 70-foot bsg depth needed for this investigation. <br /> To evaluate the feasibility of using ozone infusion as a groundwater remediation alternative, <br /> ATC proposes to collect soil and groundwater samples to perform a laboratory bench scale <br /> test. Soil samples will be collected from the two proposed soil borings, SB-1 and MW-10, <br /> and clean soil samples for an attenuation test will be collected from one additional boring, <br /> SB-2. Groundwater samples will be collected from monitoring well MW-2. The EHD <br /> approves conducting the bench scale test for ozone infusion, with the recommendation that if <br /> the soil samples will actually be split, the analytical laboratory conducting the test should split <br /> the samples to preserve volatile organic compounds; duplicate samples collected for different <br /> laboratories may be separated in the field. <br /> To define the vertical extent of the groundwater contamination, ATC proposes to install one <br /> deep groundwater monitoring well near MW-6. The new well will be installed to approximate <br /> total depth 150 feet bsg, and will have a 10-foot screened interval. The well will be installed <br /> through a 130-foot conductor casing to seal off the upper zones of contamination from the <br /> new well. The EHD approves the proposed deep groundwater monitoring well. <br />