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_�7 07/20/92 0'7 2 2 415 726 1217 ` 1 P 02 <br /> i <br /> AUGEAS CORPORATION <br /> RosANNIA GARRISON 799 WiN STRt;Er,SurlL A Tet,t:r►­toN[:: (415)726-77M <br /> P stnl n*� HAU MooN BAY,CALIFORNIA 94019 <br /> July 24, 1992 <br /> Mr. Michael M. Collins Intl <br /> Environmental Health Division UL 2 7 1992 <br /> San Joaquin County Public Health Service's N ppNME���H <br /> P,O. Box 2009 E <br /> i�i2MlSiSERV <br /> Stockton, CA 95201 <br /> RR: Soil Boring Placement Report- Unioti Safe Deposit Site 7810 Thornton F oad, Stockton, CA <br /> Dear Mr. Collins: <br /> This letter will explain Augeas Corporation's rationale for the selection of soil bor''ng locations on the Union Safe <br /> 1?eposit Site, located at 1710 Thornton Road in Stockton. <br /> On June 22, 1990, a representative of Augeas Corporation visited the Stockton wilding Department to search <br /> historical archives fordocuments revealing the exact location of the former underground storage tanks at the subject <br /> property. Augeas Corporation was informed by tiie Building Department that alt rough the former gas station's <br /> permit number was on record, the actual plans were misplaced and never transfen•e onto microfilm, Because these <br /> l laps were unavailable, boring placement was based upon the following documen ation: <br /> -Aerial photographs of the former service station <br /> •Bluelines of the existing bank structure. <br /> -Diagram of tank locations- Fire Prevention District tank removal permit <br /> An aerial photograph dated April 1 G, 1982 was obtained from Geonex of Sacramento.The bluelines of the existing <br /> batik structure were provided to Augeas Corporation by Leslie Trotter of Union Safi Deposit. The photograph was <br /> copied onto regular paper and enlarged to the same scale as bluelines of the existing bank structure. The two <br /> R <br />