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STATE OF CALIFORNIA GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION -. <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> 1 October 1990 OCT 3 `- ) <br /> ENVIRUP, FI <br /> Mr. David Bates PER[.`:: <br /> Marley Cooling Tower Company <br /> 5800 Foxridge Drive <br /> Mission, Kansas, 66201 <br /> GROUND WATER MONITORING PROGRAM, MARLEY COOLING TOWER COMPANY, CITY OF STOCKTON, SAN <br /> JOAQUIN COUNTY, CALIFORNIA <br /> We have reviewed your hydrogeological consultants proposed plan to modify your <br /> quarterly ground water monitoring program. We do not agree that all of the <br /> monitoring wells with at least four quarters of sampling data should be sampled on a <br /> semi-annual basis. Furthermore, we need additional information regarding the <br /> offsite domestic and irrigation wells south of Main Street before we can determine <br /> if a semi-annual sampling frequency is sufficient. The attached memorandum lists <br /> those existing monitoring wells that we want sampled on a quarterly basis, and <br /> describes the information we need on the domestic and irrigation wells prior to <br /> making a decision regarding their sampling frequency. <br /> In addition, based upon our review of the last four quarterly monitoring reports, we <br /> believe that additional monitoring wells are required to delineate the extent of the <br /> contamination, to account for the changes in ground water flow in the North Yard due <br /> to the drought, and possibly to monitor the effectiveness of the proposed ground <br /> water extraction systems. Since the DHS approved Remedial Action Plan provides for <br /> the submittal of the design of the ground water remedial alternative by December <br /> 1,1990 we recommend that this submittal also include (1) your plans (including <br /> timelines) to install additional monitoring wells to determine plume boundaries, <br /> (2) your assessment of the effectiveness of the North Yard's existing ground water <br /> monitoring network, (3) your monitoring plans for determining the effectiveness of <br /> the interim ground water extraction projects, (4) a map showing the locations of the <br /> domestic and irrigation wells south of Main Street and your rationale for sampling <br /> these wells on a semi-annual basis, and (5) the chromium concentration trend <br /> diagrams for each monitoring well . <br /> If you have any questions please contact John Tomko at (916) 455-5712 or myself at <br /> (916) 361-56700./ <br /> /,�///►L�/ . v <br /> Antonia 1C. J. Vorster <br /> 27 <br /> Senior Engineer <br /> JJT:jt <br /> cc w/ enc: Mr. Jim Austreng, Department of Health Services, Sacramento <br /> Mr. Ron Valenoti , San Joaquin Co. Public Health Services, Stockton <br /> Mr. Peter Quinlan, Hargis and Associates <br />