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ENVIRONWENTAL HEALTH DEPARTMENT <br /> °U1� SAN JOAQUINCOUNTY <br /> a 2< Donna K. Heran, R.E.H.S. Program Coordinators <br /> i Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Laurie A. Cotulla,R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S.,R.D.I. <br /> • ... y„�P. Assistant Director Margaret Lagorio, R.E.H.S. <br /> �,FORa Telephone: (209)468-3420 <br /> Robert McClellon,R.E.H.S. <br /> Fax: (209)464-0138 Jeff Carruesco, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Kasey Foley,R.E.H.S. <br /> THOMAS O'NEILL FEB 2 3 2007 <br /> PO BOX 923 <br /> STOCKTON CA 95201 <br /> RE: Valley Motors Site Code: 1166 <br /> 800 E. Main St. RO#: 594 <br /> Stockton, CA 95202 CUF#: 12540 <br /> The San Joaquin County Environmental Health. Department (EHD) has reviewed Fourth <br /> Quarter- 2006 Report (QMR) dated December 19, 2006 submitted by Upgradient <br /> Environmental Consultants (UEC) and has the following comments. <br /> r During the Third Quarter-2006 the soil vapor extraction (SVE) system was turned.off. <br /> and your consultant stated that soil vapor concentrations were not high enough to <br /> warrant continued vapor extraction. Since that time, the ground water samples from <br /> monitoring wells VM-2 and VM4. have shown an increase in dissolved petroleum <br /> concentrations. <br /> The following recommendations were included in the QMR and requested comment <br /> from the EHD: <br /> • Discontinue sampling VM-8 for petroleum constituents. <br /> • Remove the thermal oxidation unit from the site. <br /> • Perform a short-term ground water extraction (GWE) test from well VM-2. <br /> • Evaluate GWE as a feasible remedial alternative. <br /> The EHD approves reducing ground water sampling of VM-8 to annual. The sampling <br /> event for VM-8 shall beat the highest depth to ground water, usually in March. <br /> Air sparing well SW-1 is screened from 29.5 to 31.5 feet which is above the current <br /> depth-to water at the site.- With elevated levels of petroleum in the ground water at the <br /> site, the EHD will require you to evaluate additional remedial actions prior to removal of <br /> the SVE unit. Removal of the SVE unit is.NOT approved at this time. <br /> A work plan to install a properly screened air sparge well and conduct an air <br /> sparge/vapor extraction test at this.site is required and is to be.submitted to the EHD by <br /> March 30, 2007. <br />