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i Ji three. The regional groundwater gradient is indicated to be to the east. Depth to water �} measurements talo in the three (3) monitoring wells on March 8, 1994, shows the gradient at this site to be to the northeast at the rate of approximately .01 feet per foot, PLATE X11. f LOCATION OF NEARBY WELLS: 1 The wells that the Flood Control District uses for water level measurements are shown on '1 a the attached PLATE V. Within a mile radius of the site are three (3) Department of Water Resources wells 4J2, 3K1, and 10R1; there is also one (1) San Joaquin County well 11E2. According to Margaret Lagorio with the San Joaquin County Department of Environmental Health Services, there are no known monitoring wells within the "area of ' influence" for this site. PRIOR USE OF REMOVED UST: �! The year that Mr. George Lechich acquired the property is not known, but records from the City of Stockton Building Department show that a permit was granted for the f construction of a tilt-up concrete warehouse on April 21, 1961. According to EXHIBIT C the age of the removed UST was twenty-eight (28) years; therefore it would have been installed at the site sometime in 1960. It contained leaded gasoline which was used by Valley Showcase vehicles. The UST was removed from the site on February 11, 1988. SUMMARY OF PRIOR WORK On January 5, 1988, Mr. George Lucas dba Valley Showcase signed an administrative `.? hearing agreement with San Joaquin Local Health District (EXHIBIT A) to submit a �i closure plan for the UST on or before February 5, 1988. On January 19, 1988, Jim Thorpe Oil, Inc. filed an application with the SJLHD for the removal of the 500 gallon underground ' storage tank from the site. This application was approved on February 9, 1988, the UST was removed February 11, 1988, (refer to EXHIBIT B) and a soil sample taken at a depth of thirteen (13) feet at the western end of the pit excavation (PLATE VII). Mr. W.R. i �} Snavely, from the SJLHD witnessed the tank removal and soil sampling and noted on EXHIBIT D that there was a small hole next to the bottom bung-on the tank and that the soil sample taken at a depth of thirteen (13) feet, maximum depth of the backhoe, had a petroleum odor and grey coloration. No groundwater was encountered to this depth. The I soil sample taken from the bucket of the backhoe was taken by Joel Willis Graham, from Canonie Environmental Services Corp., and delivered to the laboratory by proper chain of custody for analysis of BTX and TPH using methods approved by the local regulating ` agency (EXHIBIT F). The laboratory results reported Benzene non-detect, Toluene 150 ppm, Xylene 370 ppm, and TPH 1000 ppm. c ji Due to the indicated contamination during sampling, Mr. Bill Snavely from the SJLHD filed a notification of hazardous waste discharge requiring further site assessment to E . y determine the nature and extent of contamination (EXHIBIT E). EXHIBIT G shows the final destination and use of the 500 gallon UST which was removed from the site. II mak, 3