SITE INFORMATION AND CORRESPONDENCE FILE 2

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San Joaquin County 0C, Environmental Health Department DIRECTOR Donna Heran,REHS 600 East Main Street PROGRAU COORDINATORS Stockton, California 95202-3029 Robert McClellan,REHS Jeff Carruesco, REHS,RD[ Kasey Foley,REHS Website: www.sjJov.org1ehd i=6 Phone: (209)468-3420 Linda Turkatte,REHS Fax: (209)464-0138 May 5, 2011 Mr. Michael D. & Ms. Sharon Olivarez 540 Scotts Ave. Stockton, CA 95203 Subject: Skips Service Station (former) LOP Case#:1038 300 S. California St. CUF#:8492 Stockton, CA 95203 APN: 14909501 The San Joaquin County Environmental Health Department (EHD) has reviewed First Quarter 2011 Monitoring Report (QMR) dated March 10, 2011. The QMR covers the monitoring well groundwater sampling event conducted on March 2, 2011. The conclusion in the QMR stated that the groundwater plume is still undefined to the east. It was recommended in the QMR that the remedial action at the site, groundwater extraction/pump and treat (GWE), continue to be suspended so that the limited finances could be used to define the groundwater plume to the satisfaction of the EHD. The EHD has evaluated the groundwater data from the most recently installed, downgradient monitoring wells, MW-10 and MW-11. As MW-10 provides groundwater samples with slightly elevated concentrations of total petroleum hydrocarbons as gasoline (TPHg), the EHD has concluded that the concentrations detected support an interpretation that the 'zero-line' for TPHg is reasonably close to this area and no additional delineation is required at this time. In previous conversations your consultant, Foothill Engineering, indicated that installing monitoring wells MW-10 and MW-11 and continuing to operate the GWE system was beyond your financial capacity. The EHD therefore approved your request to temporarily discontinue the remediation process until after the wells were installed. Monitoring wells MW-10 and MW-11 were installed in July 2010 and the remediation system has been offline since February 2009, MW-10 and MW-11 were sampled in July 2010, October 2010, and March 2011, and the EHD has concluded that the groundwater plume is not reducing in concentration and that the on-site secondary source of petroleum (impacted soil) is continuing to impact the groundwater which then migrates off-site; remediation is therefore appropriate. The EHD denies your request to keep the remediation system offline. You are hereby directed to restart the remediation system and 61ace it"back into full operation immediately. Please provide quarterly remediation status reports to Geotracker within 15 days of each quarter's end, with the first due July 15, 2011.