SITE INFORMATION AND CORRESPONDENCE CASE 1

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Y Former Western Lift January 5, 2010 3430 S. EI Dorado Street Page 2 of 2 Further research was conducted by your consultant Phase One Environmental. Document review found that the San Joaquin County Assessor had recorded an additional on-site UST (UST-4). It had been installed approximately 30 feet south of the out of service well near what was referred to as the Oil Building. The exact time of the UST-4 removal is unknown, but may have occurred prior to the State of California UST regulations coming into affect. The area where UST-4 had existed was investigated. Soil and groundwater contamination (gasoline) was documented during soil boring completions and MW installations. A soil vapor extraction and ground water air sparging remediation system (SVE/AS) was installed and is currently in operation. Ground water remediation is underway in the area of former UST-4 and the contaminant concentrations are declining, but remain .relatively high. The SVE/AS system must continue 'to operate until a No Further Action Required (.NEAR) status is granted by the appropriate regulatory agency. The EHD has received Site Conceptual Model & Closure Report dated April 23, 2009, prepared on your behalf by Geo-Phase Environmental. The Report is for the southern area of your site, where UST-1, UST-2 and.UST-3 were removed. The EHD and Central Valley Water Quality Control Board staffs have agreed that this area has completed the required investigation and corrective action/cleanup. All remaining MWs in this area can be destroyed. A Closure/No Further Action required letter for your site can not be considered until the area of former MW-4 on the northern end of your site has been fully remediated. Please prepare and submit a work plan, an EHD permit application for the MW destructions, and the required fees to the EHD to destroy all remaining MWs in the southern area of your site. If you have any further questions regarding this matter, please contact Harlin Knoll at(209) 468- 3442. Harlin Knoll, REHS Nuel Henderson, PG Senior Environmental Health Specialist Engineering Geologist cc: James L. L. Barton, California Central Valley"Regional Water Quality Control Board, Underground Storage Tank Unit, 11020 Sun Center Drive, #200, Rancho Cordova, CA 95670-6114 SWRCB Division of Clean Water Programs, Cleanup Fund Program, PO Box 944212, Sacramento, CA 94244-2120- Cleanup Fund Steve Lankford, Geo-Phase Environmental, Inc., 2937 Veneman Avenue #8240, Modesto, CA 95336