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%0001 1 <br /> San Joaquin County DIRECTOR <br /> Donna Heran, REHS <br /> Environmental Health Department <br /> �.co ASSISTANT DIRECTOR <br /> J <br /> 600 East Main Street Laurie Cotulla,REHS <br /> V): Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> �. �. W3 •. <br /> _ Carl Borgman, REHS <br /> Mike Huggins,REHS,RDI <br /> Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> Phone: (209)468-3420 Robert McClellon, REHS <br /> Fax: (209) 464-0438 Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> May 13, 2008 <br /> Stephanie Furgal <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road Room K2240 <br /> San Ramon, CA 94583 <br /> Subject: Former Unocal #2859 <br /> 1665 Pacific Avenue <br /> Stockton, CA <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the "First <br /> Quarter 2008 Monitoring and Sampling Report" (Report) dated April 30, 2008, prepared by <br /> ARCADIS for the above subject site and provides the following comments. <br /> Monitoring well NP1 was originally constructed with a screen interval from 85 to 90 feet below <br /> surface grade (bsg) and it has been found to be obstructed at a depth of 51.9 feet bsg. Since <br /> the water samples from this well were non-detect for contaminants of concern prior to the <br /> obstruction and there are surrounding Zone B monitoring wells, the EHD concurs with the <br /> Report recommendation that the well doesn't have to be replaced. Since the well can no longer <br /> function as originally designed, it is to be destroyed as recommended in the Report. Submit a <br /> work plan for destruction of the well, an EHD well permit application and $89 permit fee to the <br /> EHD by June 16, 2008. <br /> As previously noted in EHD letters dated March 21, 2007 and March 26, 2008, to Chevron the <br /> ozone sparge system previously operated at the site was to be evaluated and that following the <br /> assessment, the existing system was to be modified or another method of remediation was to <br /> be proposed. If it cannot be demonstrated that the contaminant concentrations at this site will <br /> meet water quality objectives in a reasonable time (estimated to be about 10 years) then active <br /> remediation must be performed to expedite the site clean up so it will be completed within that <br /> reasonable time frame. In the March 26, 2008 letter EHD required a response to the EHD <br /> letters dated March 21, 2007 and July 3, 2006, be submitted by May 27, 2008. <br /> If you have any questions contact me at (209) 468-3449. <br /> Margaret agorio, REHS <br /> Program Coordinator Unit IV <br /> c: Jim Barton, CVRWQCB <br /> Ms. Helen McCrary, c/o Bank of Stockton, PO Box 1110, Stockton, CA, 95201 <br /> David Evans, ARCADIS, 10470 Old Placerville Rd Ste 110, Sacramento, CA, 95827 <br />