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Cr1%8r1NC. SACRAMENTO <br /> REVIEW DRAFT <br /> August 31, 1990 <br /> Mr. Harlan Knoll r' <br /> 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 Pacific Bell <br /> Ashley Road Facility (UE-132) ; Versar Job No 6264.308 <br /> Dear Sir: <br /> The purpose of this letter is to present an Addendum to Versar's <br /> Remediation Plan for the Pacific Bell Facility located at 7644 Ashley <br /> Road, Stockton, California. <br /> INTRODUCTION <br /> The Pacific Bell Ashley Road facility is located in rural San <br /> Joaquin County, northeast of the City of Stockton, California. Figure <br /> 1, Attachment I shows the site location. The facility is the site of <br /> known soil contamination resulting from a 1,000 gallon underground <br /> storage tank (UST) . Figure 2, Attachment I shows the site layout. <br /> The UST had contained diesel fuel used to operate the facility's <br /> emergency generator. The contamination was originally discovered during <br /> the analysis of two soil samples collected from beneath the UST at the <br /> time of its removal by LBME Corporation in April , 1988. Based upon a <br /> letter work plan prepared by LBME, a site investigation was conducted on <br /> October 31 and November 1, 1988. The investigation which included the <br /> drilling of four boreholes, was supervised, at the request of Pacific <br /> Bell , by Versar. The results of the investigation were documented by <br /> Versar in a report entitled "Site Assessment of the Pacific Bell Ashley <br /> Road Stockton Facility (UE-132) " dated January 3, 1989. The <br /> investigation identified the presence of up to 7,100 parts per million <br /> (ppm) of total petroleum hydrocarbons as diesel fuel (TPH-d) at a depth <br /> of 30 feet below the surface. Benzene, toluene, ethylbenzene, and <br /> xylene (BTEX) were also reported to be present but at low levels. <br /> Benzene was identified at less than one ppm and the other volatile <br /> compounds were in the range from zero to six ppm. Ground water which is <br /> reported to be present at the site at a depth of greater than 60 feet <br /> below the surface, does not appear to have been impacted. Figures 3 and <br /> 4, Attachment I show the borehole locations and the estimated extent of <br /> contamination. <br /> 5330 PRIMROSE DRIVE o SUITE 228 o FAIR OAKS,CALIFORNIA 95628 <br /> TELEPHONE:(916)962-1612 0 FAX.,(916)952-2678 <br />