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lowest levels measured in January, 1994 _ <br /> LOCATION OF NEARBY, WELLS <br /> The property is supplied by city water; according to the San <br /> Joaquin County Flood Control District map, there are no private <br /> or domestic wells within 1/2 mile of the site Available records <br /> reveal that most wells are completed below 125 feet due to the <br /> lack of sufficient aquifers above that depth. <br /> However, there are four groundwater monitoring wells on a parcel <br /> owned by U. S. Chemical Just south of where Shaw Road makes a <br /> sharp bend. Those wells were placed to monitor possible ground- <br /> water contamination from a waste-water evaporation pond. A <br /> review of the file of that site shows that the hydraulic gradient <br /> has been generally towards the northwest, distinctly different <br /> from that measured on. the Canteen property. PLATE VI shows the <br /> approximate locations of the wells on the two properties. <br /> PRIOR USAGE OF UST <br /> The 10, 000 gallon UST had been installed sometime prior to 1984 <br /> for the purpose of fueling Canteen Corp. delivery trucks and <br />• company vehicles. According to company personel, it had only <br /> contained unleaded gasoline. Records of fuel purchase and <br /> volumes used are not available. The pump island had been located <br /> on the southeast side of the tank, dust at the edge of the <br /> existing carport roof. <br /> SUMMARY OF P IOR WORK <br /> March 1992 - A 10, 000 gallon UST which had contained gasoline <br /> was removed from the site_ Soil samples taken after tank removal <br /> were below detection limits, but samples from the removed spoil <br /> revealed the presence of Toluene, Ethylbenzene, Xylene, & TPH--G. <br /> The removed spoil was returned to the hole <br /> November, 1992 -- The site of the removed UST was reentered to <br /> remove the spoil which had been returned to the hole. During <br /> this work, additional soil contamination was encountered on the <br /> east, south, & west walls; (refer to PLATES VII & VIII, & TABLE <br /> IT for details of that work ) Space constraints prevented further <br /> work; the excavation was later filled with clean soil & pea <br /> gravel. <br /> Januar 1993 - Wm. J. Hunter & Associates, (WJH, ) prepared a <br /> workplan to place five (5) soil borings around the site of the <br /> removed UST in an attempt to define the limits of soil contami- <br /> nation. A copy of that workplan is included as APPENDIX B. <br /> 3 <br />