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0 MEMORANDUM . <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD - CENTRAL VALLEY REGION <br /> 3443 Routier Road, Suite A Phone: (916) 361-5600 <br /> Sacramento, CA 95827-3098 ATSS Phone: 8-495-5600 <br /> TO: Antonia K. J. Vorster it FROM: John J. Tomko <br /> Senior Engineer Associate Engineer <br /> San Joaquin Regulatory <br /> Ivvl <br /> DATE: 20 September 1990 SIGNATURE: <br /> SUBJECT: GROUND WATER MONITORING PROGRAM, MARLEY COOLING TOWER COMPANY, SAN JOAQUIN <br /> COUNTY <br /> On 3 August 1990 we received a letter from the Marley Cooling Tower Company (Marley) <br /> requesting that the Regional Board and the Department of Health Services approve a <br /> modification of their existing quarterly groundwater monitoring program. Attached to <br /> the letter was a proposed plan to modify the ground water monitoring by Marleys' <br /> hydrogeologic consultant Hargis and Associates. The Hargis proposal is contained in <br /> Table 1 (attached). The major modification is that all monitoring wells having at <br /> least four quarters of sampling data, and all domestic and irrigation wells south of <br /> Main Street, will be sampled semi-annually instead of quarterly. <br /> Marley' s stated objective for the monitoring program is to assure the continued <br /> surveillance of the plume boundary and direction of movement. Marley has requested <br /> that we approve this program so that they can implement it beginning in October 1990. <br /> Hargis proposes that the monitoring program be reevaluated semi-annually, and that the <br /> evaluation criteria include changes in the direction of ground water flow and water <br /> quality trends. <br /> I have reviewed this proposal and met with Mr. James Austreng, of the Department of <br /> Health Servies, on 17 September 1990 to discuss the proposed modification. Also, I <br /> have reviewed the last four quarterly ground water monitoring reports, including the <br /> July 1990 report that was received on 14 September 1990. <br /> Based upon my review and my discussions with Mr. Austreng, Jim and I have agreed that <br /> (1) monitoring wells MW-5 and MW-102 (to be replaced by MW-212 if MW-102 goes dry) be <br /> sampled on a quarterly basis to satisfy RCRA post-closure monitoring requirements for <br /> the waste pond, (2) all extraction wells be sampled quarterly, and (3) the following <br /> monitoring wells be sampled quarterly: <br /> 1) North Yard - due to recent changes in around water flow directions <br /> Shallow wells 401 , 210, 302, and 209. <br /> Intermediate wells 2, 211 and 441. <br /> 2) Downgradient Plume - due to incomplete delineation of its extent <br /> Intermediate wells 442, 426, 428, 438, 430, 439 and 440. <br /> Deep wells 464 and 461. <br />