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00 <br /> Mr. Ron Rowe <br /> Page 3 <br /> TPHg content in the water sample from HPI, however. This is inconsistent with the chemical <br /> signature of the potential source. It is also notable that no odors or positive FID readings <br /> occurred in boring HP 1. It may be that the TPHg was accidently introduced into the sample in <br /> the field or the laboratory. <br /> The source of MTBE in the groundwater in MW 1 is not believed to be from the 647 East <br /> Miner site. We suspect the MTBE results from the release at the 601 East Miner site, although <br /> recent analytical data and groundwater flow direction do not provide conclusive evidence of <br /> this. Based on the age of the USTs (removed in 1987) and their purported use for waste oil <br /> storage it is highly unlikely that any MTBE was ever present. If the source of MTBE <br /> contamination in the groundwater was the USTs, we would have expected to detect MTBE in <br /> the water sample from boring HP4, located directly downgradient of the former USTs. <br /> The magnitude of MTBE present in the groundwater does not justify additional investigation at <br /> i <br /> the site. Ground Zero recommends that the site be closed with no further action required. <br /> i <br /> If you have any questions or comments, please contact Ground Zero at your earliest convenience. <br /> Sincerely, <br /> Grou ysis, Inc. <br /> arvey, �'tE G <br /> Staff logist �cr` ��\ <br /> J U)1 <br /> r� GREGORY P. <br /> STAHL <br /> Gregory P. Stahl, RG 5023 No. 5023 <br /> CA Certified Hydrogeologist 264 �, a <br /> OF <br /> Attachments <br /> PC: Mr. Patrick D. Riddle, Esq. <br /> Mr. Marty Hartzell, RWQCB Sacramento <br /> Mr. Fred D. and Mary Clark, et.al., c/o Paul Balestracci, Esq. <br /> Ms. Janice Magdich, Esq. <br /> i <br /> groundzcWa11eyvw12gm2000 <br />