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tARGIS+ASSOCIATES INC.• avidR .argil, RG. R.G. <br /> r Michael R. Long, R.G. <br /> Terry M. Turner, R.G. <br /> 2223 Avenida De Le Pla a, Suite 30(!x1 ri, •- r I 1•'7 A. Memeyec R G. c E.G, <br /> LaJolla, CaiFC�niC 92037 <br /> Y t 711' Aa J. Raymond <br /> �.� ' " Christopher G.A. Ross. R.G. <br /> 16191 454-0165 Thomas 1. Ryon <br /> Telecopier(619)454-5839 93 A" 2 1 F <br /> A", L ' 158 <br /> ' July 16, 1993 <br /> ' Timothy J. Verhagen, Esq. <br /> THE MARLEY COMPANY <br /> 1900 Johnson Drive <br /> Mission, KS 66205 <br /> Re: April -May 1993 Quarterly Groundwater <br /> Monitoring and Performance Monitoring Letter Report, <br /> Marley Cooling Tower Company Facility Stockton, California <br /> ' Dear Mr. Verhagen: <br /> This letter report presents the results of the April -May 1993 Quarterly <br /> Groundwater and Performance Monitoring round conducted at the Marley Cooling <br /> ' Tower Company (MCTC) facility, Stockton, California (Figure 1) . Monitoring was <br /> conducted during the period April 26 through May 11, 1993 by GeoAnalytical <br /> Laboratories, Inc. with technical support provided by Hargis + Associates, Inc, <br /> Quarterly groundwater and performance monitoring included measurement of <br /> water levels in all piezometers, monitor wells, and reclamation wells; collection <br /> ' of soil moisture samples from lysimeters; and collection of groundwater samples <br /> from selected monitor wells, reclamation wells, domestic wells, irrigation wells, <br /> and California Water Service (CWS) wells in the site vicinity (Table 1 ; <br /> ' Figure 2) . <br /> Soil moisture and groundwater samples were analyzed for total dissolved <br /> chromium using U.S. Environmental Protection Agency Method 6010. Laboratory <br /> ' analyses were performed by BC Laboratories, Bakersfield, California, and <br /> Analytical Technologies, Inc. , San Diego, California. <br /> ' A progress report on the full -scale soil flushing operations in the <br /> vicinity of the retort pit has been prepared by Black & Veatch Waste Science and <br /> Technology Corporation (Black & Veatch) (Appendix A) . The soil flushing <br /> operation report has been prepared as a supplement to this report and is being <br /> provided under separate cover by Black & Veatch. <br /> In accordance with discussions with the Regional Water Quality Control <br /> Board and the California Department of Toxic Substances Control on March 5, 1993, <br /> redistribution of the remedial wellfield pumpage was recommended to provide more <br /> continuous noncyclic pumping (Table 2) . The redistribution of remedial wellfield <br /> ' pumpage commenced in April 1993. <br /> Other Offices: <br /> Tucson, AZ <br /> Tempe, AZ <br /> Manhattan Beach, CA <br /> ' Burbank, CA <br />