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LOCATION OF WELLS WITHIN 2,000 FEET OF PROPERTY: <br /> The attached EXHIBIT A lists wells identified by the California Division of Water Resources. <br /> Field investigation reveals that the list is incomplete. We are currently performing a detailed <br /> survey of the area to locate existing wells. PLATE I shows some of the wells located during <br /> previous work. An undated map will be forwarded as soon as the current survey is completed. <br /> PRIOR USE OF UST's: <br /> Two, 5,000 gallon UST's which had been used for storing diesel fuel were removed from the <br /> property in March, 1987. There are no records concerning amounts of fuel used during the time <br /> the tanks were in service. <br /> SUMMARY OF PRIOR EVENTS: <br /> March, 1987 - Two 5,000 gallon diesel UST's removed from site, Some contamination <br /> measured in soil samples taken after tank removal. <br /> March, 1988 - Site of removed UST's reentered. Soil samples taken at 28'& 29' below grade. <br /> Xylene& TVPH measured in both samples. Excavation filled with clean soil. <br /> April 3,6, & 7, 1992 - Three (3) groundwater monitoring wells placed on site to depths of 84', <br /> 86', & 89'. Refer to W7H report titled "Groundwater Investigation Report" dated May, 1992 <br /> for details of that work. <br /> May 30, 1996 - One(1) soil boring was advanced to 80' bgl; it was located in the area which <br /> had been occupied by the diesel UST's. Minor amounts of ethylbenzene were measured at 31', <br /> 36',41',& 56'. Low levels of xylene was detected at 31', 36', 41', 46', 51', 56',61', & 71'. TPH as <br /> gasoline was measured in samples taken from 31'to 71', and at 80'. Significant levels of TPH as <br /> diesel were measured in all samples taken. TABLE I summarizes the results of that work, and <br /> also MW-1 &MW-4. Refer to the Lush Geo siences report titled "Interim Investigation Report <br /> Marcy's Diesel Service", dated August 17, 1996 for details. <br /> October 10, 1996 - MW-1 was purged and sampled by Dei-Tech Geotechnical Support <br /> Services, but the laboratory results were considered inaccurate due to apparent contamination of <br /> sampling equipment. <br /> November 27, 1996 - MW-1 was resampled by Del-Tech. Laboratory results revealed the <br /> following: benzene -ND, toluene -ND, ethylbenzene - 0.4 ug/L, xylene - 0.8 ug/L, and TPHg - <br /> 222 ug/L. TEPH was ND, and MTBE was not identified. <br /> 2 <br />