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• SIVITH ENVIRONMENTAL TECHNOLOGIES CORPORATION October 16, 1996 94-326 Mrs. Ardis Clancy 5316 Wedge Circle Fair Oaks, CA 95628 Subject: Permission to access property, 26140 N. Thornton Road, Thornton, California Mrs. Clancy: Smith Technology Corporation is involved in a subsurface investigation of former underground gasoline storage tanks (USTs) at 25056 Thornton Road in Thornton, California. Petroleum hydrocarbon contaminated soil was excavated from the former location of the former USTs at the site, and six groundwater monitoring wells have been installed to monitor groundwater quality beneath the site. Very low levels of gasoline hydrocarbons associated with the former UST have been detected in the soil and groundwater in the vicinity of the former UST excavation. Due in part to the presence of a water supply well near the project site, the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has requested the installation of additional soil borings to further assess soil and groundwater conditions. The ideal location of some of the proposed soil borings/groundwater monitoring well lies within the boundaries of your property (APN 001-150-13-0) located at 26140 N. Thornton Road. The placement of the soil borings/monitoring well on your property would be of great assistance to the investigation and would consequently benefit the community of Thornton with minimal inconvenience to you. Figure 4 shows the proposed locations of the soil borings/monitoring well on your property. The soil boring will be approximately 1.5 inches in diameter and advanced to approximately 30 feet below ground surface (bgs). If a monitoring well appears warrented, a 2-inch diameter monitoring well will be installed to a depth of approximately 30 feet below grade. Both the soil borings and possible monitoring wells would be installed in accordance with local and state regulations and under the regulatory guidance of PHS/EHD. Upon completion of the soil borings, the borings would be properly filled from the bottom to the ground surface with neat cement. Wells, if installed, would be completed at grade (flush with ground surface). Once the well is installed it will likely be monitored on a quarterly basis (four times per year) for the duration of the investigation. At the conclusion of the investigation the well, if installed, will be destroyed in accordance with local and state regulations. 1260 Graphics Drive • Modesto, CA 95351-1502 • (209) 579-2221 • Fax (209) 579-2225 Engineering • Consulting • Remedial ion • Construction w: \ 94326 \ LETTERS \ ACCSLT1 a.croc