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California logional Water Quality Cool Board <br />Central Valley Region <br />Linda S. Adams <br />Secretary for <br />Environmental <br />Protection <br />2 July 2010 <br />Mr. Eric Jenks <br />Wilbur -Ellis Company <br />P.O. Box 1030 <br />Marysville, CA 95901 <br />Katherine Hart, Chair <br />11020 Sun Center Drive #200. Rancho Cordova, California 95670-6114 <br />Phone (916) 464-3291 • FAX (916) 464-4645 <br />http://www.waterboards.ca.gov/centraIvaIley <br />JUL 0 7 2010 <br />ENVIRONMENT HEALTH <br />PERMIT SERVICES <br />Arnold <br />Schwarzenegger <br />Governor <br />REVIEW OF THE ADDENDUM #1 TO THE DEEPER GROUNDWATER INVESTIGATION <br />RESULTS AND MONITORING WELL INSTALLATION WORK PLAN, JOHN TAYLOR <br />FERTILIZERS CO. STOCKTON, SAN JOAQUIN COUNTY <br />Staff of the California Regional Water Quality Control Board, Central Valley Region (Central <br />Valley Water Board) has reviewed the Addendum #1 Deeper Groundwater Investigation <br />Results and Monitoring Well Installation Work Plan (Work Plan) for the subject site, located at <br />1819 South Argonaut Street in Stockton, San Joaquin County, California. The Work Plan and <br />the Addendum were prepared on your behalf by Geosyntec consultants, and were received by <br />the Central Valley Water Board on 4 May 2010. <br />Results of the deeper groundwater investigation and future work at the Site were discussed in <br />a meeting between Wilbur Ellis, Geosyntec and Central Valley Water Board staff on 14 April <br />2010. Based on the discussion, the Central Valley Water Board staff requested the following <br />to be included in the Work Plan Addendum: <br />1. Water levels in the proposed new deeper groundwater monitoring wells will be <br />measured on quarterly basis for first year. <br />2. A tentative plan and schedule for downgradient delineation of 1,2-DCP and 1,2,3 -TCP <br />in deeper groundwater. <br />3. Preliminary data will be collected and evaluated to assess future remedial options in the <br />deeper groundwater at the Site. <br />4. A schedule for implementing the field investigations and distributing a public notice to <br />the Site's downgradient neighbors along South Argonaut Street. <br />5. After evaluating the deeper groundwater flow direction and gradient, additional <br />downgradient CPT and groundwater sampling will be conducted to characterize the <br />lateral extent of 1,2-DCP and 1,2,3 -TCP in deeper groundwater. Tentative proposed <br />locations for the additional CPT investigations will be selected and submitted to the <br />Central Valley Water Board by 1 November 2010. <br />Geosyntec has also proposed to conduct a slug test to obtain an order -of -magnitude estimate <br />of aquifer hydraulic conductivity in the immediate vicinity of each tested well. Data would be <br />used for initial screening of potential remediation technologies. <br />Central Valley Water Board concurs with the general approach of work proposed in the Work <br />Plan and the Addendum. <br />California Environmental Protection Agency <br />4p' Recycled Paper <br />