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Guardino and Crawford <br /> 517 West Fremont <br /> Page 2 <br /> 9.6 ug/1 of benzene, and 1 .6 ug/l of MTBE. Additional investigation to define the lateral <br /> and vertical extent of the groundwater contamination is required. <br /> The southern extent of the shallow zone of contamination is also not fully defined. <br /> Although the grab groundwater sample of P4 was non-detect, the P4 grab groundwater <br /> sample was collected in 1997, and the analytical results of the grab groundwater sample of <br /> P11 collected in 2000 were 660 ug/1 TPH-g, 5.3 ug/l MTBE, and 22 ug/l tertiary butanol <br /> (TBA). The sample in P4 is too far from P11 and MW-5 to be considered as the southern <br /> delineation of the groundwater contamination. In addition a relatively large data gap (about <br /> 80 feet) exists between MW-1 , MW-3, and MW-4. Since groundwater flow direction is to <br /> the northeast, additional investigation off-site is required to delineate the groundwater <br /> contamination in the northeast direction. <br /> Submit a work plan that will delineate the vertical extent and the lateral extent of the <br /> groundwater contamination to EHD by July 31, 2004. <br /> If you have any questions, please contact Jeffrey Wong at (209) 468-0335. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> C' c <br /> Jeffrey Wong, Senior REHS Margaret ag."o, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB, Central Valley Region — James L. L. Barton, RG <br /> c: Advanced GeoEnvironmental, Inc. — Daniel W. Kalmbach <br />