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07-23-1997 14:30 P.02 <br /> W NaR. <br /> July 23, 1997 <br /> Mr. Steve Sasson,R.E.H.S. <br /> San Joaquin County Public Health Services, <br /> Environmental Health Division <br /> 304 East Weber Avenue,Third Floor <br /> P.O.Box 388 <br /> Stockton,California 95201-0388 <br /> Reference: Revised Workplan for Subsurface Investigation at the Bank of America Branch <br /> No. 0852 Located at 234 West Main Street in Ripon, California. <br /> Versar Project No. 3622-500 <br /> Dear Mr. Sasson: <br /> Versar,Inc. (Versar),on behalf of Bank of America,has been conducting an <br /> environmental investigation at the Bank of America Branch No. 0852 located at 234 West Main <br /> Street in Ripon,California(Site). The Site location and Site layout are shown in Figures 1 and 2, <br /> included in Attachment I,respectively. This revised workplan replaces the workplan submitted <br /> with permit application dated July 10, 1997 and approved by you on July 14, 1997. <br /> Versar proposes drilling five boreholes at the locations shown in Figure 2. Three of the <br /> boreholes will be placed in the nearest accessible area to the auto repair facilities formerly <br /> located at the Site. The locations of the former auto repair building is shown on the Sanborn Fire <br /> Insurance Map included in Attachment II. Because of the presence of a former dry cleaning <br /> facility across the street to the north of the Site,Versar proposes to place two of the boreholes in <br /> a position between the former auto repair facility and the former dry cleaner to assess whether <br /> the offsite former dry cleaning facility has impacted groundwater beneath the Site. The location <br /> of these wells is upgradient from the Site. <br /> Assuming the upper 18 inches of soil at the Site has been disturbed by development,one <br /> soil sample from each borehole will be collected at a depth of approximately two feet below <br /> ground surface(bgs),or at one foot below encountered aggregate baserock. The boreholes will <br /> be drilled using small truck-mounted Geoprobe®soil coring and sampling equipment. One soil <br /> sample from each of the three boreholes will be submitted to a California certified laboratory for <br /> volatile organic compounds(VOC)analysis by Environmental Protection Agency(EPA)Method <br /> 8240. <br /> x wwmCra�ea�Amvaa�.lt8v <br /> • SACRAMENTO OFFICE• <br /> 7844 MAMON AVENUE,SURE 167•FAIR OAKS,CALIFORNIA vAn•TELEPHONE:(916)964-1611 FAX:(916)962-M <br />