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February 28, 2018 <br />Project No. 2154-1817-01 <br />Ms. Vera Fischer, P.G., RWQCB <br />Work Plan for Additional Site Assessment <br />1817 South Fresno Avenue, Stockton, CA <br />Page 4 <br />Data from the November 2017 subsurface investigation prompted, in part, for the <br />RWQCB and the USTCF to request this Work Plan. <br />The approximate extent of GRO and benzene to groundwater is presented in cross <br />sectional view, on Figures 7 and 8, respectively. Figures 7 and 8 also include a <br />geologic cross section that illustrate subsurface conditions oriented in a west- <br />northwest to east-southeast direction (in the direction of groundwater flow and <br />predominant plume transport). <br />SCOPE OF WORK <br />The objectives of the proposed scope of work are to: <br />Further assess the vertical and lateral extent of petroleum hydrocarbon impact to <br />groundwater. <br />Additionally, characterize geologic conditions (subsurface strata) at the Site, in <br />particular below approximately 60 feet bgs. <br />To accomplish these objectives, Stratus is proposing the following work activities: <br />Advance one (1) cone penetrometer test boring (CPT-2) to approximately 90 feet <br />bgs for profiling of soil lithologies. <br />Collect depth discrete groundwater samples from separate borings (CPT-1 <br />through CPT-3) at approximately 60 and 90 feet bgs. <br />The proposed scope of work has been subdivided into four tasks, as outlined below. All <br />work will be conducted under the direct supervision of a State of California Professional <br />Geologist or Professional Engineer, and will be conducted in accordance with standards <br />established by the December 2015 Leaking Underground Storage Tank Guidance <br />Manual issued by the State Water Resources Control Board. Proposed CPT boring / <br />sampling boring locations are shown on Figure 4. <br />Task 1: Pre-Field Activities <br />Following approval of this Work Plan by the RWQCB, the following activities will be <br />completed: <br />Obtain an encroachment permit and a revocable permit from the City of Stockton, <br />Obtain a drilling permit from SJCEHD, <br />Retain and schedule a licensed C-57 CPT/drilling contractor, <br />Update the Health and Safety Plan for the Site, <br />KABames Trucking\Work Planaames trucking cpt work plan 2018.doc STRATUS