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California Regional Water Quality ontrol Board` <br /> Central Valley Region : <br /> Robert Schneider,Chair <br /> Alan C.Lloyd,Ph.D. Arnold <br /> Secretary for Sacramento Main OfficeSchwarzenegger <br /> Environmental •11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114REceVED <br /> Governor <br /> Protection Phone(916)464-3291 •FAX(916)464-4645 <br /> http://www.waterboards.ca.gov/centralvalley <br /> FEB 1 5 2005 <br /> 11 February 2005 ENvIRO."ENT <br /> P'E13? 1T;,Q CES <br /> J. <br /> Ms. Donna J. Murphy <br /> J. R. Simplot <br /> 16777 Howland Road <br /> Post Office Box 198 <br /> Lathrop, CA 95330 <br /> CORRECTIVE A CTION PLANAND DRAFT MONITORING AND REPORTING PROGRAM, <br /> J. R. SIMPLOT, 16777 HOWLAND ROAD, LATHROP, SAN JOAQUIN COUNTY <br /> Regional Water Quality Control Board (Regional Board) staff have reviewed the April 2003 Water <br /> Quality Protection Standard submitted on your behalf by Geomatrix, the Quarterly Pond and Test Well <br /> Assessment Report 2nd Quarter 2004 and your 29 July 2004 letter in which you requested that the <br /> Regional Board give permission to abandon the original monitoring wells, LP-1, LP-2, LP-3, and PW-1- <br /> 48, or to reduce monitoring frequencies for these four wells. Detection monitoring has shown that <br /> groundwater has been degraded due to activities on the site. The wastewater ponds were doubly-lined as <br /> part of a corrective action to prevent further groundwater degradation. At the request of Regional Board <br /> staff, J.R. Simplot installed four new monitoring wells,LP-4,.LP-5, LP-6, and LP-7. These four wells <br /> are screened across the water table with screens installed from 10 to 25 feet below ground surface (bgs). <br /> Monitoring wells, LP-1, LP-2, and LP-3,were installed in 1982 and were screened from 45 to 50 feet <br /> bgs, 59 to 64 feet bgs, 39 to 44 feet bgs, respectively. Monitoring well PW-1-48 was installed in 1980 <br /> and was screened 40 to 45 feet bgs. <br /> Groundwater samples from monitoring locations downgradient of the ponds have concentrations above <br /> those groundwater samples taken from background monitoring well LP-7.for the following constituents: <br /> sulfate, total dissolved solids, calcium, phosphate,potassium, ammonia, sodium, and nitrate. Since <br /> groundwater has been degraded due to activities on the site, J.R. Simplot must clean up the groundwater <br /> to water quality objectives that restore beneficial uses. The groundwater must be cleaned up to <br /> background levels if technically and economically feasible. If it is not feasible to cleanup to background, <br /> Simplot must clean up to the lowest level feasible and at least to the most stringent water quality <br /> objective for each constituent. By 28 February 2005,please submit a Corrective Action Plan to clean <br /> up groundwater. <br /> Regional Board staff have enclosed a draft revised Monitoring and Reporting Program for your review, <br /> which proposes to reduce sampling frequencies for monitoring wells LP-1, LP-2, LP-3 and PW-1-48 to <br /> annual sampling. Since these wells monitor a deeper portion of the aquifer than the water table <br /> monitoring wells and are showing groundwater degradation, they are necessary for monitoring vertical <br /> migration of contaminants and the effectiveness of groundwater cleanup once in place. <br /> California Environmental Protection Agency <br /> �a� Recycled Paper <br />