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0 <br /> ® Engineering,Planning, <br /> Corporate Office: <br /> Environmental Sciences and 605 Third Street .I _ �- i�i 760.942.5147 <br /> &ASSOCIATES,INC. <br /> Prajsaional Dmoss for Complex Projects Management Services Encinitas,California-92024 Fax 760.632.0164 <br /> -� PM 1: 33 <br /> November 29, 1999 <br /> Ms. Carrie Romine <br /> California Regional Water Quality Control Board <br /> Central Valley Region 5 <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3098 <br /> RE: Proposed Revisions to Groundwater monitoring Program for <br /> Marley Cooling Tower Company Facility, Stockton, California <br /> Dear Ms. Romine: <br /> On behalf of Marley Cooling Tower Company (MCTC), Dudek & Associates, Inc. <br /> (Dudek) has been providing technical oversight for the groundwater monitoring program <br /> conducted at the Marley Cooling Tower Company facility in Stockton, California. Field <br /> operations for the groundwater monitoring program are currently conducted by <br /> GeoAnalytical Laboratories of Modesto, California. Using data supplied by <br /> GeoAnalytical Laboratories, Dudek has compiled analytical data and constructed <br /> chromium concentration maps and hydrographs, compiled groundwater elevation data, <br /> constructed groundwater elevation maps and groundwater elevation hydrographs, <br /> reviewed QA/QC data to validate the chromium concentration data supplied by the <br /> laboratory; prepared and submitted groundwater monitoring reports, and provided <br /> logistical liaison with GeoAnalytical Laboratories. <br /> In March 1996 Dudek proposed changes to the original groundwater monitoring <br /> program (Dudek, March, 1996). The California Regional Water Quality Control Board, <br /> Central Valley Region (CRWQCB-CVR), concurred with those recommendations <br /> (CRWQCB-CVR, August 14, 1996). Additional review of cumulative concentration data <br /> and hydrogeological data indicates that total chromium concentrations in the dissolved <br /> plume are decreasing and the areal extent of the dissolved chromiumlplume is decreasing <br /> in response to remedial activities(Dudek, May 1998). In our opinion, further revisions to <br /> the groundwater monitoring program are warranted. Also, Dudek proposes that further <br /> revisions to the monitoring program be addressed two years from now, based on <br /> monitoring reports between now and then. <br /> CURRENT GROUNDWATER MONITORING PROGRAM <br /> The current sampling and analytical schedule for the MCTC facility is summarized in <br /> Table 1, attached. The current schedule can be summarized as follows: <br />