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T M _. <br /> AR 10 <br /> Iffieffes"Taft. SACRAMENTO <br /> November 19, 1990 <br /> Mr. Harlan Knoll <br /> NCO Registered Environmental Health Specialist <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 445 N. San Joaquin <br /> Stockton, California 95202 <br /> Reference: Addendum to the Remediation Plan for the <br /> Pacific Bell Ashley Road Facility; (UE-132) ; <br /> Versar Job No 6264.308 <br /> Dear Sir: <br /> The purpose of this letter is to present an Addendum to <br /> Versar's Remediation Plan for the Pacific Bell Facility located <br /> at 7644 Ashley Road, Stockton, California. <br /> INTRODUCTION <br /> _ The Pacific Bell Ashley Road facility im located in San <br /> Joaquin County, northeast of the City of Stockton, California. <br /> Figure 1 (Attachment I) shows the site location. The facility is <br /> the site of known soil contamination as a result of a .leak from a <br /> 1,000 underground storage tank (UST) . Figure 2 (Attacnment I) <br /> shows the site layout. The UST had contained diesel fuel used to <br /> operate the facility's emergency generator. The contamination <br /> was originally discovered from the analysis of two soil samples <br /> collected during the removal of the UST by LBME Corporation <br /> (LBME) in April, 1988. Based upon a letter work plan prepared by <br /> LBME, a site investigation was conducted on October 31 and <br /> November 1, 1988. The investigation which included the drilling <br /> of four boreholes, was supervised, at the request of Pacific <br /> Bell, by Versar. The results of the inveL igation were ; <br /> documented by Versar in a report entitled "Site Assessment of the <br /> Pacific Bell Ashley Road Stockton Facility (UE-132) " dated <br /> k January 3, 1989. The investigation identified the presence of up <br /> to 7,100 milligrams per kilogram (mg/kg) of petroleum <br /> hydrocarbons as diesel fuel (TPH-d) at a depth of 30 feet below <br /> the surface. Benzene, toluene, ethylbenzene, and xylene (BTEX) <br /> were also reported to be present. Benzene was identified at less <br /> than one mg/kg and the other volatile compounds were in the range <br /> from zero to six mg/kg., `it is unknown if ground water, which is <br /> reported to be present at the site at a depth of greater than 60 <br /> feet below the surface, has been impacted. Figures 3 and 4, <br /> 5330 PRIMROSE DRIVE•SWTE 221 FAIR OAKS,CALIFORNIA 95628 <br /> TELEP:LNE:(916)962-1612+FAX:(916)962-2678 <br />