SITE INFORMATION AND CORRESPONDENCE

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Mr. Anthony Mattioli Page 2 of 2 Wilson Way Tire Company, Inc. January 28, 2014 1987 UST Removal mg/kg, toluene <0.1 mg/kg, ethylbenzene <0.2 mg/kg, total xylenes <0.1 mg/kg, EDB<0.01 mg/kg, and lead<10 mg/kg. In December 1991, the EHD evaluated your site for case closure or requiring corrective action. By letter dated 03 January 1992, the EHD indicated that then current "standards, laboratory detection limits and/or your site specific characteristics (i.e. depth to seasonal high groundwater, nearby wells, septic systems) make it impossible for PHS/EHD to evaluate your site for closure." As reported in the Phase I Report, a groundwater monitoring well was installed in the sidewalk adjoining the subject site to characterize and monitor groundwater impacted by an unauthorized release from a UST system on another site, in this case the site at 102 S. Wilson Way, Stockton. The groundwater monitored in the screened zone 55 to 75 feet bsg has been periodically impacted by TPHg, BTEX and MTBE. The impact to groundwater in MW-10 was attributed to the release on the 102 S. Wilson Way site. The EHD concurs with Boles' assessment of the data that "it appears that contamination from offsite sources are (sic) potentially impacting the deep groundwater beneath the subject property". The EHD has reevaluated your site characteristics and data and has determined that your site qualifies for case closure with the available data. No indications of an unauthorized release from your former UST system were noted during its removal, such as elevated PID readings or visibly stained or odoriferous soil. Laboratory analysis of the soil sample collected under EHD supervision was not impacted by chemicals of concern at concentrations exceeding reporting limits adequate for your site characteristics. Contaminants in groundwater beneath the site appear to be related to unauthorized releases on other sites. Provided that the information and interpretations provided to the EHD are accurate and that no new information is developed that contradicts that which has been provided, and that the site circumstances do not materially change, the EHD has determined that no further action is required relative to the former 1,000-gallon UST system removed from your site in October 1987. This case closure does not include any other environmental conditions that may exist on the subject property. Questions and comments can be addressed to Nuel Henderson, PG, at (209) 468-3436 or at nhenderson(o-)sicehd.com. Sincerely, �f VYG K z— F�— Donna Heran, REHS Director C James L.L. Barton, CVRWQCB, 11020 Sun Center Dr., Ste 200, Rancho Cordova, CA 95670