SITE INFORMATION AND CORRESPONDENCE (2)

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San Joaquin County o. °P'" Environmental Health Department DIRECTOR � _.f`.co Donna Heran, REHS r. 2 600 East Main Street c , PROGRAM COORDINATORS yy :< Stockton, California 95202-3029 Robert McClellan, REHS Jeff.C_arruesco,REHS,RDI Website: www.sjgov.org/ehd r �av,.REHs /FOR Phone: (209) 468-3420 Fax: (209) 464-0138 March 3, 2010 Mr. Robert Trommer, CHG State Water Resources Control Board Division of Financial Assistance 1001 1 Street Sacramento, CA 95814 SUBJECT: COMMENTS ON CLEANUP FUND SITE CLOSURE RECOMMENDATIONS Dear Mr. Trommer: The San Joaquin County Environmental Health Department (EHD) has received your e-mail dated February 18, 2010, requesting comments on the status of 25 sites your office recommended for closure in 2008 through June 2009. Of the 24 sites in the San Joaquin County LOP (one of the sites listed is in Sacramento County): • Eleven are either in the final closure process or are about to enter it; • Seven have problems related to vapor intrusion evaluations, are in rebound testing or awaiting additional technical evaluation; and • Six require further work such as additional monitoring, delineation or remediation. Claim No. 15211 - 23569 Santa Fe Road, Escalon During the last reported monitoring event (September 2008), the TPHg and benzene concentrations in monitoring well MW-3 appeared to have rebounded from 790 pg/L and 2.5 pg/L to 86,000 pg/L and 270 pg/L, respectively. Concentrations of the same analytes in MW-7 were also elevated at 2,100 pg/L and 230 pg/L, respectively. Impacted ground water around MW-3 was delineated by monitoring wells in three directions while it is similarly delineated in only one direction around MW-7. The impacted groundwater is in an area of high groundwater usage; in fact MW-7 is approximately 15 feet from a domestic well believed to be only 140 feet deep. In August 2008, a membrane interface probe (MIP) investigation in the core areas was conducted, but the results have not been submitted to the EHD for review. At this time the EHD believes additional monitoring of the core and inboard wells is needed to more fully understand the import of the last reported monitoring results. Additional monitoring of MW-3 and MW-7 would also be helpful. The EHD believes it would only be prudent to review the report of findings for the recent MIP investigation and conducting at least one more monitoring event before. initiating site closure. The major impediment for moving forward on this site is that the RP had received significant reimbursements from the CUF, but reportedly has not paid his consultant. The consultant is not conducting any additional work and is holding back the report of the MIP investigation.