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April 3, 6, & 7, 1992 - Three (3) groundwater monitoring wells placed on site to depths <br /> of 84', 86, & 89. Refer to WJH report titled "Groundwater Investigation Report" <br /> dated May, 1992 for details of that work. <br /> May 30, 1996 - One (1) soil boring was advanced to 80' bgl; it was located in the area <br /> which had been occupied by the diesel UST's. Minor amounts of ethylbenzene were <br /> measured at 31', 36',41',& 56'. Low levels of xylene was detected at 31', 36', 41', 46', 51', <br /> 56',61 , & 71'. TPH as gasoline was measured in samples taken from 31'to 71', and at 80'. <br /> Significant levels of TPH as diesel were measured in all samples taken. TABLE I <br /> summarizes the results of that work, and also MW-1 &MW-4. Refer to the Lush <br /> Geosiences report titled "Interim Investigation Report Marci's Diesel Service", dated <br /> August 17, 1996 for details. <br /> October 10, 1996-MW-1 was purged and sampled by Del-Tech Geotechnical Support <br /> Services, but the laboratory results were considered inaccurate due to apparent <br /> contamination of sampling equipment. <br /> November 27, 1996 - MW-1 was resampled by Del-Tech. Laboratory results revealed <br /> the following: benzene -ND, toluene - ND, ethylbenzene - 0,4 ug/L, xylene - 0.8 ug/L, <br /> and TPHg - 222 ug/L. TEPH was ND, and MTBE was not identified. <br /> January 9, 1997 - WJH submitted a report covering the above work, and requested the <br /> site be closed. Refer to that report titled "Results of 11/27/96 Groundwater Sampling <br /> and Request for Closure" for more details. <br /> March 25, 1997 - The San Joaquin County PHS, EHD informed the owners that the <br /> Technical Review Committee had reviewed the site and would not approve site closure. <br /> The EHD required an additional monitoring well to be placed on the property. A copy of <br /> that correspondence is included as EXHIBIT A. <br /> April 3, 1997 - WJH submitted a workplan to perform the work required. A copy of that <br /> document is included as EXHIBIT B. <br /> April 15, 1997 - The San Joaquin Co. EHD approved the workplan with modifications. <br /> A copy of that correspondence is included as EXHIBIT C. <br /> DETAILS OF LATEST WORK: <br /> September 4, 1997 - Wm. Hunter, RG from Wm. J. Hunter& Associates arrived on <br /> location at 0840 hours. Del-Tech Geotechnical personel arrived earlier to determine depth <br /> to water in MW-1; it was measured at 67'below grade. V& W Drilling, Inc. mobilized a <br /> 3 <br />