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T w <br /> •STAT EAOF CALIFORNIA GEORGE OEUKM EJIA N, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> 0— <br /> CENTRAL <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD, SUITE Ag <br /> SACRAMENTO, CA 95827-3098 <br /> 28 November 1990 <br /> Mr. David Bates <br /> Marley Cooling Tower Company <br /> 5800 Foxridge Drive <br /> Mission, Kansas 66201 <br /> MINUTES OF THE 14 NOVEMBER 1990 MEETING, MARLEY COOLING TOWER COMPANY, SAN <br /> JOAQUIN COUNTY <br /> Enclosed for your information are the minutes from the 14 November 1990 meeting <br /> which was held with your representatives, the Department of Health Services and <br /> the Regional Board. The meeting was held to discuss ground water extraction <br /> modeling, scheduling, modification of the National Pollution Elimination <br /> Discharge System (NPDES) permit and the content of the quarterly monitoring <br /> report submittals. <br /> Based on the preliminary results of the ground water extraction modeling, it <br /> appears that the final extraction system will capture the majority of the <br /> chromium contaminant plume during the worst case scenario (July 1990 drought flow <br /> conditions) and will capture all of the plume during periods of historical ground <br /> water flow conditions. We are pleased with these initial conservative modeling <br /> results and look forward to the submittal of the ground water extraction modeling <br /> report due in December 1990. <br /> The NPDES permit is being modified to incorporate additional toxicity testing for <br /> the effluent using Ceriodaohnia as a test species on a monthly basis, but will <br /> reduce the required frequency of toxicity testing using fathead minnows. The <br /> frequency of all toxicity testing will probably be reduced once the final <br /> expansion of the treatment system is in-place and the test results show that the <br /> effluent does not cause instream toxicity. We plan to send out the Tentative <br /> Waste Discharge Requirements by 30 November 1990. <br /> If you have any questions, please call me at (916)361-5670. <br /> CAMILLA WILLIAMS <br /> Engineering Geologist <br /> CKW:cw <br /> Enclosure <br />