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SERVICESPUBLIC HEALTH <br /> SAN JOAQUIN COUNTY ' <br /> w: <br /> JOGI KHANNA M.D..M.P.H. <br /> Health Officer ��1 �;'� <br /> P.O. Bax 2009•(1601 Fast H=eron Maxie) •&odw%Cal kmia 95201 <br /> (209)468-3400 <br /> MR LARRY CHAPMAN <br /> MANNA PRO CORPORATION SEP 0 4199` <br /> 7711 CARONDELET AVE STE 800 <br /> ST LOUIS MO 63105 <br /> RE: 4004 S. ELDORADO SITE CODE: 1088 <br /> ST(C3C1j0N, CA <br /> Public Health Services Environmental Health Division (PHS/EI D) has reviewed your most recent <br /> Quarterly Report, dated July 15, 1992 and prepared by Groundwater Technology, Inc., and has the <br /> following comments: <br /> 1) There is great concern over the fact that the Benzene levels in both MW-1 and MW-3 <br /> continue to rise each quarter. PHS/EHD concurs with your consultants observation that additional <br /> groundwater monitoring wells will be necessary to establish the lateral extent of groundwater <br /> contamination. This phase of the groundwater investigation should be executed as soon as possible. <br /> Please submit a workplan/proposal to PHS/EI-ID and the Central Valley Regional Water Quality Control <br /> Board(CVRWQCB) by 11/31/92. <br /> 2) The request to no longer analyze for TPH-as-diesel in the groundwater can not be granted <br /> due to the fact that TPH-D was detected (620 ppm) in the sod, at a depth of 33 feet in S6B. However, <br /> since TPH-as-diesel has not been detected thus far in the groundwater, a reduction in the frequency to <br /> yearly seems a reasonable compromise at this point. <br /> 3) it would be extremely helpful if future Quarterly Reports could have all previous <br /> groundwater sample results tabulated into one table. This format provides the viewer with trends in <br /> concentrations of contaminates and aids in comparisons between monitoring wells. Your assistance in <br /> this matter would be greatly appreciated. <br /> Should you have any questions or concerns regarding these issues, or the site status in general, please <br /> contact Steven Schneider, Senior RENS, of my staff at (209) 468-3441. <br /> Jogi Khann M.D., M.F.H. <br /> Health - .r <br /> w y <br /> A. C , REHS, Program Manager <br /> 'Environmental Health Division <br /> v IAC/SS <br /> C. Mr. Dean Willis, Esq. C. Ms. Elizabeth Thayer- CVRWQCB <br /> O'Melveny and Myers <br /> 400 South Hope Street <br /> Los Angeles, CA 90071-2899 <br /> A Dwbion of San Joaquin CowsY Health c=Service <br />