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• • Eonnuwo G. BHOWP:JH. <br /> RECEIVED AI i <br /> (,p LIF O w N l p SE"TIART tw RU UHIUUtL <br /> Water Boards MAY 2 1 .2012 ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control BoiifidPERMIT/SERVICES LTH <br /> 17 May 2012 <br /> Mr. Eric Jenks <br /> Wilbur-Ellis Company <br /> P.O. Box 1030 <br /> Marysville, CA 95901 <br /> REVIEW OF THE 2011 ANNUAL REPORT AND RESULTS OF THIRD QUARTER 2011 <br /> SEMI-ANNUAL GROUNDWATER MONITORING REPORT, JOHN TAYLOR FERTILIZERS <br /> 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 2011 Annual Report and Results of Third Quarter <br /> 2011 Semi-Annual Groundwater Monitoring Report (Report) dated 31 October 2011, for the <br /> JTF site (Site), located at 1819 South Argonaut Street in Stockton, San Joaquin County, <br /> California. The Report was prepared for Wilbur-Ellis Company (Wilbur-Ellis) by Geosyntec <br /> Consultants (Geosyntec) of Oakland, California. The Report provides results from the two <br /> semi-annual groundwater monitoring and sampling events that were conducted at the Site in <br /> February and August during the year 2011. <br /> Central Valley Water Board comments on the Report are provided below. <br /> 1. Staff notes that elevated levels of 1,2,3-trichloropropane (1,2,3-TCP) and <br /> 1,2,dichloropropane (1,2-DCP) have been detected in the groundwater beneath the <br /> Site in both shallow and deep groundwater-bearing zones. These concentrations are <br /> above water quality objectives. Soil investigations conducted in 1999 and 2005 did <br /> not reveal a significant source area for 1,2,3-TCP, and as of today a source area for <br /> 1,2,3-TCP has not been identified. Vertical and lateral extent of 1,2-DCP and 1,2,3- <br /> TCP have been established onsite for shallow groundwater. Although additional <br /> deeper groundwater investigations are in progress to define the lateral extent of <br /> 1,2,3-TCP and 1,2-DCP, staff concludes that Wilbur-Ellis should also evaluate <br /> remedial alternatives for 1,2-DCP and 1,2,3-TCP to protect groundwater quality <br /> beneath the Site. By 1 December 2012 submit a feasibility study (FS) work plan on <br /> how to remediate the elevated levels of 1,2-DCP and 1,2,3-TCP. The FS work plan <br /> should include a schedule and an evaluation and selection of remedial alternatives <br /> that will remediate and restore the beneficial uses of the groundwater beneath the <br /> Site. Attachment A describes the items to be included in the Feasibility <br /> Study/Remedial options Evaluation Report. <br /> KARL E. LONGLEY SCD, P.E., CHAIR I PAMELA C. CREEDON P.E., BCEE, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive 11200,Rancho Cordova,CA 95670 I www.waterboards.ca.gov/centralvalley <br /> C%nECYCLED-r- <br />