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*4000 Sup, <br /> Brett Hunter <br /> 3246 E. Fremont St. <br /> Page 2 <br /> Groundwater monitoring commenced, unfortunately only two sampling events occurred <br /> prior to MWI, MW2, and MW3 being reported dry on February 22, 1989. <br /> Contamination was detected in all samples collected. <br /> Additional monitoring wells, EA-1, EA-2, EA-3, and EA-4 were installed on February 10, <br /> 1988. Groundwater at this time was initially encountered at approximately 46 feet. <br /> Groundwater contamination was detected in samples collected from EA-1, EA-2, and <br /> EA-4. No confirmation groundwater samples were collected from EA-2 prior to the well <br /> being reported dry on February 22, 1989. Three groundwater sampling events occurred <br /> prior to EA-1, EA-3 and EA-4 being reported dry on September 21, 2989. <br /> Monitoring wells, MW1, MW2 and MW3, were destroyed on August 9, 1990. Two <br /> additional monitoring wells, EA-5 and EA-6, were also installed on August 9, 1990. <br /> Groundwater at this time was initially encountered at approximately 69 feet. No <br /> contamination was detected in groundwater samples collected from EA-5 and EA-6. <br /> During the last sampling event, May 19, 1992, groundwater was reported at <br /> approximately 77 feet. <br /> Please include in the work plan a discussion and evaluation of historic information <br /> documenting soil and groundwater contamination at various locations and depths. Since <br /> neither soil nor groundwater remediation of the site has occurred, mass balance <br /> evaluation with estimation of the original source volume should be included within the <br /> work plan. Proposed soil borings should be located to investigate soil and groundwater <br /> contamination which has been documented. Cross sections showing the location of soil <br /> borings in relation to documented contamination should also be included within the work <br /> plan. <br /> If you have any comments or questions, please contact Mary Meays, REHS, of my staff <br /> at (209) 468-0337. <br /> Jogi Khanna, ., M.P.H. <br /> Health O eF., <br /> r <br /> L.aurie A. Cotulla, REHS, Program Manager <br /> /Environmental Health Division <br /> LAC/MM:lb <br /> c: Elizabeth Thayer, CVRWQCB c: Todd Pierson, Alton Geoscience <br /> c: Joe Mattos c: Bruce Eppler, GTI <br />