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Jeff Kasper 2 17 January 2007 <br />Therefore, staff requires that the Discharger develop a plan to protect soil surfaces from <br />further sulfur impacts and the subsequent impacts of surface and ground waters quality. <br />By 30 March 2007, the Discharger shall submit a work plan that includes the following details: <br />A calculation for sulfur background concentrations in soil at the Bulk Terminal Site. <br />Based on background sulfur concentrations and sampling/analysis, a delineation of the <br />vertical and horizontal extent of sulfur-impacted soils at Areas #1 through #6. <br />At Areas #1 through #6, over-excavation and removal of sulfur-impacted soils that are <br />above background sulfur concentrations. <br />Soil sampling and analyses to confirm the efficacy of the over-excavation at Areas #1 <br />through #6. <br />A conceptual design (with drawings) for a mechanical interruptive device, such as a <br />multi-layer cap or similar model, to prevent sulfur from further impacting bare soil and <br />the subsequent degradation of surface and ground waters. <br />Should you have any questions, please do not hesitate to call me at (916) 464-4676. <br />Mary Boyd <br />Water Resource Control Engineer <br />San Joaquin River Waste Discharge to Land Unit <br />cc: Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br />Tom Mogan, Metropolitan Stevedore, Stockton <br />Chuck DeLong, H.J. Baker, Stockton <br />Dave Wilkey, Martin Operating Partnership, Stockton <br />Peter D. Weiler, ERS Corporation, Walnut Creek <br />,Jeffrey Wingfield, Port of Stockton, Stockton <br />MLBAMPOS-SlfrMgmtPln_SplmntlInfo_l doc