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. at (209 ) 468-3446 . Mr. Wilson indicated that his department had no record of underground storage tank removal at the site, that laws regarding such removals were passed in 1984 , and his office did not initiate monitoring and record keeping regarding such matters until 1986 ( six years after redevelopment of the site) . It was Mr. Wilson ' s opinion that any underground fuel storage tanks were removed during redevelopment. On January 22, 1991 , an attempt was made to locate World Enterprises, the company responsible for demolition of structures attendant to property redevelopment, without success. Contact was made this date with Mr. Mike Escoto of the San Joaquin County Air Pollution District at ( 209 ) 468-3470. Mr. Escoto had no record of underground storage tank removals at the subject site. Subsequent to being informed by Mr. Hillman of Grubb and Ellis that Mr. John Cox of Mel Bokides Petroleum, Inc. of 2191 Navy Drive, Stockton, had delivered gasoline to the subject site for many years, Uriah staff telephoned Mr. Cox at ( 209 ) 943-2011 . Mr. Cox stated that all underground fuel storage tanks had been located on the west side of the subject property and had fcontained only gasoline. On January 25 , 1991 , contact was made with Mr. Heimrich of Texaco Oil Company ' s Environmental Services Division in Sacramento I (telephone [ 9161 361 -0614 ) . Mr. Heimrich advised that all underground storage tanks were removed from the site in 1979 ! prior to Texaco selling the property. Mr. Heimrich advised further that no soil or groundwater sampling/analysis was/ performed. . .consistent with standard practice at that t*me; � although he recalled that the excavated soil was permitted to aerate for several months . � ' ! PHASE II: SUBSURFACE INVESTIGATION 1 1401' On February 6 and 7, 1991 , Uriah staff utilized the KVA Portable Sampling System to advance four soil borings at the subject �� 1 site. Depths of the 7/8-inch diameter borings ranged from eight (8) feet below ground surface (bgs ) to ten (10) feet bgs . Various drive points and sampling devices were affixed to the stainless steel KVA probes which were advanced with a hand held roto hammer. Between grade and approximately one foot bgs, the probes encountered hard, compacted fill; however, the probes were easily advanced beyond the one foot level to the depths indicated upon encountering a matrix of light brown sand with very little clay. All KVA probe samples were acquired on the west side of the property ( the area in which the underground storage tanks were located according to Mr. Cox of Mel Bokides Petroleum, Inc. ) with borings placed at the locations specified on Figure #f2, 3 .