SITE INFORMATION AND CORRESPONDENCE

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Mr. Robert Trommer 4 i Page 2 of 5 Comments on CUF Site Closure Recommendations December 15, 2011 . CUF Claim No. 1978 (former Thiemann's Service S ation, 106 S. Second Street, Ripon) -- in Closure Process. The EHD has reviewed a just -received evaluation of residual soil contaminant concentrations that exceed the Environmental Screening Levels (ESLs) established by the San Francisco Bay Regional Water Quality Control Board for direct contact and gross contamination. The evaluation demonstrated that these contaminant concentrations do not pose a significant risk or hazard to human health, therefore the EHD is initiating the formal closure process. CUF Claim No. 4423 (former Earthgrains site, 1717 S. Center Street, Stockton) — in Final Closure Process. The CCS is in preparation and will be submitted to the CVRWQCB as part of the 30-day notification requirement; monitoring wells need to be destroyed; and the certificates for IDW disposal must be received. CUF Claim No. 8431 (Ripon Farm Service, 932 S Hwy 99, Ripon) — in Final Closure Process. Monitoring wells await destruction and certificates for disposal of IDW must be submitted to the EHD. CUF Claim No. 8753 (former Arc Pump and Welding, 1211 S. Center Street, Stockton) — in Closure Process. A no-further-action-request (NFAR) has been submitted and review is pending. The EHD anticipates initiation of the formal closure process upon review of the document. Assuming the report is adequate and favorable, EHD closure documents must be prepared, notifications made, monitoring wells destroyed and certificates for disposal of IDW must be received. 'U'F laim o. 1-1r775�(fo V gue Cleaners, 23`I-5 'N. all ornia Street, _Stockton) in r inalClosure Process. Monitoring wells have been destroyed and the EHD is awaiting the ertificatesfor-disposal�of IDW to close theisite. CUF Claim No. 13850 (former Scotty's; 574 Grant Line Road, Tracy) — in Final Closure Process. Awaiting receipt of certificates for disposal of IDW and a closure letter will be issued immediately following receipt of the certificatesk. CUF Claim No. 14558 (Tracy Marine, 2353 Toste Road, Tracy) — Report Needed. The EHD has a directive letter in preparation for submittal of a closure summary report to start the closure process. CUF Claim No. 16139 (Fast and Easy; 244 W. Harding Way, Stockton) — in Final Closure Process. The EHD has approved the well destruction plan; the wells must be destroyed; and the certificates for disposal of IDW received prior to closing the site. CUF Claim No. 17179 (the Customer Store, 15 E. Grant Line Road, Tracy) — Report Needed. Total petroleum hydrocarbons quantified as gasoline (TPHg) concentrations in soil gas samples exceeded the Environmental Screening Levels (ESL) of 29,000 micrograms per cubic meter (pgIM3) by concentrations as high' as 3,700,000 pgIM3. The EHD had directed that the risk and hazard posed by the high TPHg concentrations in soil gas be addressed before closing the site. The EHD received an evaluation that did not address the high TPHg concentration except to note that the a was no California Health Hazard Screening Level (CHHSL) established for TPHg. While that may be true, the EHD considers the potential hazard posed by the high TPHg concentrations to be an issue that must still be addressed prior to initiating the site closure process. Therefore, an additional report is needed. The EHD comments on the 20 new sites elevated to the EHD Director's attention are as follows (except for CUF Claims Nos. 1026 and 16908 for reasons noted above): CUF Claim No. 367 (former Langston Arco or Market, 15615 S Seventh Street, Lathrop) — in Closure Process. A no-further-action-request (NFAR} report has been received and