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Page 1 of 2 <br /> Vicki McCartney [EH] <br /> From: Vicki McCartney[EH] <br /> Sent: Wednesday, April 02, 2008 3:53 PM <br /> To: 'Kirk Larson' <br /> Subject: RE: Site Reviews <br /> Kirk: <br /> The Ripon Farm Service site at 932 Highway 99 appears to have 1,2-DCA at low concentrations, based on <br /> current analytical data. However, if you compare the depth-to-groundwater measurements at this site with <br /> analytical results for diesel, there appears to be high concentrations of diesel detected when the groundwater is <br /> around 15 to 20 feet below surface grade (bsg). Currently groundwater is at about 23 feet bsg. I believe the <br /> diesel problem will have to be addressed before this site can be closed. <br /> The former Chevron gasoline station at 139 South Center Street has high concentrations for gas and BTEX in <br /> groundwater collected from monitoring wells located in the area of the former USTs. A new monitoring well was <br /> installed in November 2007, screened at 100 to 105 feet bsg. Results from the first groundwater sampling of <br /> this well indicate that gas and BTEX are detected in low concentrations. Diesel and motor oil are detected in <br /> most of the monitoring wells at this site. 1,2-DCA is being detected at low concentrations only in MW-3. No <br /> remediation has taken place since the USTs were removed in 2003. <br /> The site at 308 EI Dorado Street, Den's Auto Repair, has high concentrations for gas, BTEX, and 1,2-DCA. The <br /> vertical and lateral delineation of the plume is undefined. Additional site investigation is needed as well as <br /> interim remediation. <br /> The Earthgrains Baking Companies site at 2650 Airport Way is undergoing additional site investigation. Four <br /> CPT-MIP borings have been advanced to approximately 100 feet bsg in the last two days. Soil and grab <br /> groundwater samples will also be collected during this investigation. Remediation will follow. <br /> The site at 106 (not 160) Second Street, Ripon,just had soil gas samples collected. Groundwater <br /> collected during the first quarter 2008 indicate that only two monitoring wells have detects, and the <br /> concentrations are low. I'm hoping we can close this site soon. <br /> Vicki McCartney, Senior REHS <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> Phone: (209) 468-9852 <br /> Fax: (209) 468-3433 <br /> Email: vmccartney@sjcehd.com <br /> From: Kirk Larson [mailto:KTLarson@waterboards.ca.gov] <br /> Sent: Wednesday, April 02, 2008 10:14 AM <br /> To: vmccartney@sjcehd.com. <br /> Cc: Margaret Lagorio [EH] <br /> Subject: Site Reviews <br /> Good Morning Vicki: <br /> 4/2/2008 <br />