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Jeff Kasper 2- 14 January 2009 <br />The groundwater at the limits of HJ Baker's sulfur-stockpile area, referred to as the <br />"Clay Pit", is not adequately represented in the proposed monitoring well system <br />design. During a site investigation performed in November 2005, boring C-11, located <br />immediately downgradient of the Clay Pit and a tunnel access port, had a sulfate <br />concentration of 2,000 mg/L, above the USEPA Primary Maximum Contaminant Level <br />of 500 mg/L for drinking water. Boring C-11 also had the highest sulfate concentration <br />of any groundwater analyzed during the site investigation. Therefore, the Dischargers <br />must install a well located at the limits of the Clay Pit and directly upgradient and across <br />Stork Road from boring C-11. In addition, this well must be located down gradient (not <br />side gradient) of the tunnel access ports. During sampling under the MRP, the well will <br />be used to monitor groundwater quality immediately downgradient of the Clay Pit. <br />All wells installed under the Work Plan must be incorporated into and sampled under <br />MRP R5-2008-0825. <br />The Discharger must submit electronic data to GeoTracker, as required under <br />regulations adopted by the State Water Resources Control Board on September 2004. <br />The Global ID Number for the site is T10000000687. Please refer to the GeoTracker <br />website (www.qeotracker.waterboards.ca .dov) for information regarding submittals to <br />GeoTracker, including all required analytical data, reports, maps, boring logs, and well <br />survey data. The Dischargers must submit all required data to GeoTracker <br />by 17 April 2009. The Dischargers may obtain a copy of the regulations using the <br />website address www.waterboards.ca.gov/ust/electronic submittal/docs/text reqs.pdf. <br />Staff looks forward to working with the Dischargers on this project. Should you have <br />questions, please contact me at mbovdwaterboards.ca.gov or (916) 464-4676. <br />/72e1-3., 1:111:r2.-e? <br />Mary Boyd <br />Water Resource Control Engineer <br />Compliance and Enforcement <br />Title 27 and Non 15 Programs <br />cc: Harlin Knoll, San Joaquin County Dept. of Environmental Health, Stockton <br />Peter Weiler, ERS Corporation, Walnut Creek <br />Bill Jennings, California Sporting-Fishing Protection Alliance, Stockton <br />Ken Berry, California Citizens for Environmental Justice, Jackson <br />MLB/W\San Joaquin/Review of Group MWInstallation Plan.doc