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February 20, 2003 <br /> Ms. Devra Lewis <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> Annex Office <br /> 10365 Old Placerville Road <br /> Suite 210 <br /> Sacramento, CA 95827-2518 <br /> RE: Revised Work Plan for Additional Delineation <br /> Shell Bulk Fuel Facility —Stockton Plant <br /> 3515 Navy Drive, Stockton, California <br /> Dear Ms. Lewis: <br /> On behalf of Shell Oil Products US (Shell), The RETEC Group, Inc. (RETEC) has prepared this <br /> revised work plan for additional subsurface groundwater delineation at the Stockton Plant. A <br /> plan was prepared in response to your letter request, dated December 3, 2002, to install <br /> additional well(s) to delineate the lateral extent of petroleum hydrocarbons west of MW-33 <br /> (RETEC, 2003) and subsequently reviewed by the California Regional Water Quality Control <br /> Board — Central Valley Region (CVRWQCB, 2003). This revised plan incorporates comments <br /> provided in your letter dated January 30, 2003, and during our meeting on February 13, 2003. <br /> SCOPE OF WORK <br /> Prior to any invasive investigation activities, RETEC will prepare a site-specific Health and <br /> Safety Plan (HASP), obtain site access and approval from the adjacent land owner (Port of <br /> Stockton), and perform subsurface utility locates. <br /> Subsurface Investigation <br /> Additional subsurface delineation and subsequent monitoring well installation performed in the <br /> downgradient vicinity of MW-33 will be performed in a two-step approach employing both <br /> direct push technologies (e.g., GeoprobeO) and hollow stem auger (HSA) drilling investigative <br /> techniques. <br /> A truck-mounted Geoprobe® rig will be utilized to collect unsaturated zone soil lithology <br /> information and in-situ groundwater quality samples. The Geoprobe® will be used to obtain <br /> continuous soil cores from ground surface to the bottom of each direct push boring, <br /> approximately 5 feet below the water table surface. Once the target depth is reached, the <br /> Geoprobe® rig will also obtain a one-time groundwater sample from the shallow water table for <br /> laboratory analysis. <br />