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i LOCATION OF WELLS WITHIN 2,000 FEET OF PROPERTY: The attached EXHIBIT A lists wells identified by the California Division of Water Resources Field investigation reveals that the list is incomplete We are currently performing a detailed survey of the area to locate existing wells PLATE I shows some of the wells located during previous work An undated map will be forwarded as soon as the current survey is completed PRIOR USE OF LIST'S: Two, 5,000 gallon UST's which had been used for storing diesel fuel were removed from the property in March, 1987 There are no records concerning amounts of fuel used during the time the tanks were in service SUMMARY OF PRIOR EVENTS: March, 1987 - Two 5,000 gallon diesel UST's removed from site Some contamination measured in soil samples taken after tank removal March, 1988 - Site of removed UST's reentered Soil samples taken at 28'& 29' below grade Xylene& TVPH measured in both samples Excavation filled with clean soil April 3, 6, & 7, 1992 - Three (3) groundwater monitoring wells placed on site to depths of 84', 86', & 89' Refer to WJH report titled "Groundwater Investigation Report"dated May, 1992 for details of that work May 30, 1996 - One (1) soil boring was advanced to 80' bgl, it was located in the area which had been occupied by the diesel UST's Minor amounts of ethylbenzene were measured at 31', 36',41',& 56' Low levels of xylene was detected at 31', 36, 41', 46, 51', 56,61', & 71' TPH as gasoline was measured in samples taken from 31'to 71', and at 80' Significant levels of TPH as diesel were measured in all samples taken TABLE I summarizes the results of that work, and also MW-1 & MW-4 Refer to the Lush Geosiences report titled "Interim Investigation Report Marcy's Diesel Service", dated August 17, 1996 for details October 10, 1996 - MW-1 was purged and sampled by Del-Tech Geotechnical Support Services, but the laboratory results were considered inaccurate due to apparent contamination of sampling equipment November 27, 1996 -MW-1 was resampled by Del-Tech Laboratory results revealed the following benzene- ND, toluene - ND, ethylbenzene - 0 4 ug/L, xylene - 0 8 ug/L, and TPHg - 222 ug/L TEPH was ND, and MTBE was not identified 2