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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', 411, 461, 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 Mare'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-I 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 67below grade V& W Drilling, Inc mobilized a <br /> 3 <br />