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San Joaquin County DIRECTOR <br /> o r' DonnaHeran, REHS c Environmental Health Department <br /> ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla, REHS <br /> , < Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> • Carl Borgman, REHS <br /> Cq' . 0 Mike Huggins,REHS, RDI <br /> ��F6R�l' Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> Phone: (209)468-3420 Robert McClellon,REHS <br /> Fax: (209)464-0138 Jeff Carruesco,REHS,RDI <br /> Kasey Foley, REHS <br /> PHILLIP ELDER/JAY QUADDOURA SEP Z 6 2007 <br /> RAINWATER CARWASH <br /> 420 W YOSEMITE <br /> MANTECA CA 95337 <br /> RE: RAINWATER CARWASH SITE CODE: 231458 <br /> 420 W YOSEMITE AVE <br /> MANTECA CA 95337 <br /> On April 20, 2007, The San Joaquin County Environmental Health Department (EHD) <br /> met with your consultant Advanced GeoEnvironmental (AGE) to discuss the status of <br /> remediation activities at the Rainwater Carwash located at 420 W. Yosemite Ave., <br /> Manteca. Additionally, EHD has reviewed Quarterly Report — First Quarter 2007 (QR) <br /> dated July 20, 2007 prepared by AGE. EHD has the following comments concerning the <br /> meeting and the QR: <br /> • Submittal of a Corrective Action Plan (CAP). At the meeting, submittal of a CAP was <br /> discussed. EHD does not concur with submittal of a CAP at this time. The vertical <br /> extent of the dissolved contamination plume is still not defined due to <br /> tetrachloroethene (PCE) and trichloroethene (TCE) causing a spike in the <br /> chromatograph as total petroleum hydrocarbons quantified as gasoline (TPH-g). EHD <br /> directs that future analysis of ground water monitoring samples differentiate PCE and <br /> TCE from TPH-g. You may want to utilize EPA Method 8260 B. Report all peaks <br /> and any anomalies. If previously reported TPH-g proves to be PCE and/or TCE, the <br /> existing monitoring network may adequately delineate the vertical extent of your <br /> plume. A CAP, including remedial strategies for the vadose zone and aquifer zone, <br /> may be submitted once the vertical extent of the plume has been defined. Also a <br /> Problem Assessment Report (PAR) should not be prepared until the vertical extent of <br /> the dissolved plume has been defined. <br /> • Sampling frequency reduction for selected monitoring wells. As discussed during the <br /> meeting, EHD approves reducing the frequency groundwater sampling as follows: <br /> MW-6, MW-10, and MW-12 to semi-annual, MW-9 and MW-13 to annual sampling, <br /> and MW-11 to remain quarterly. Continue collecting depth to water measurements in <br /> all wells during each quarterly monitoring event to determine the groundwater <br /> gradient. <br />