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STATE OF CALIFORNIA - Environmental Prr -'ion Agency 0 1 PETE WILSON,Governor <br /> CALIFORNIA REGIONAL WATER GITY CONTROL BOARD. <br /> CENTRAL VALLEY REGION °' = , <br /> 3443 Routier Road, Suite AL HEA <br /> , <br /> Sacramento, CA 95827-3098 . NVIR 3i1r, <br /> x� LTH ,p <br /> TA <br /> PHONE: (916) 255-3000 P�'RMI; SER.�F�t1 ICE <br /> FAX: (916)255-3015 <br /> 96 JUL --8 AM It: 40 <br /> 5 July 1996 <br /> Mr. Nick Nickerson <br /> Unocal ERS <br /> 2000 Crow Canyon Place, Suite 400 <br /> San Ramon, CA 94583 <br /> FORMER FFIREGRO/PM AG PRODUCTS,-2130"W.-'WASHINGTON-STREET, STOCKTON- - <br /> Thank you for submitting the First Quarter 1996 Quarterly Monitoring Report for the subject site. <br /> The report documents that the two upgradient wells continue to show elevated nitrate levels, while <br /> the downgradient well has little or no nitrate. However, the opposite is true for salt, measured as <br /> total dissolved solids (TDS). This constituent increases in value across the site, with approximately <br /> 1,200 mg/1 TDS in the upgradient wells and up to 3,000 mg/1 TDS in the downgradient wells. <br /> Staff are concerned about the apparent effect site activities have had on the salt loading of the <br /> groundwater. Therefore, by 15 August 1996, please submit a letter stating your perspective, with <br /> supporting data, regarding .whether the salt increase is attributable to the feed product activities. <br /> I am also in receipt of your letter requesting a relaxation of the monitoring schedule. Because the <br /> groundwater gradient and monitored constituents have shown fairly consistent values, staff agree that <br /> groundwater monitoring may change from a quarterly basis to a twice-yearly schedule. Please <br /> conduct the groundwater monitoring during the months of March and September. The analytes are <br /> to remain the same: nitrate, total Kjeldahl nitrogen, and total dissolved solids. <br /> If you have any questions, I can be reached at (916) 255-3104. <br /> WENDY WYELS <br /> Ag Regulatory Unit <br /> cc: Mr. John Rapp, Sierra Pacific Groundwater Consultants, El Dorado Hills <br /> Mr. Jan Wagoner, Unocal, West Sacramento <br /> Ms. Charlene Wall, Stockton Port District, Stockton <br /> Mr. Jack Holm, Cargill, Stockton <br /> Mr. Mike Infurna, San Joaquin County Environmental Health, Stockton <br />