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PES Enviro0ental, Inc. <br /> vEngineering & Environmental Services <br /> October 20, 2015 <br /> 1484.001.01.005 <br /> California Environmental Protection Agency <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive #200 <br /> Rancho Cordova, California 95670 <br /> Attention: Ms. Emily Cushman <br /> Subject: Work Plan for Focused Soil Removal <br /> Paradise Point Marina <br /> 8095 Rio Blanco Rd. <br /> Stockton, California <br /> Dear Ms. Cushman: <br /> PES Environmental, Inc. (PES) has prepared this work plan at the request of the California <br /> Regional Water Quality Control Board (CRWQCB ) to document interim response measures <br /> proposed for a petroleum hydrocarbon fuel release that recently occurred at the Paradise Point <br /> Marina in Stockton, California (the site or subject property, see Plate 1). The proposed interim <br /> response measures include conducting focused soil excavation in the vicinity of the fuel release <br /> where petroleum hydrocarbons are present in vadose zone soils. <br /> BACKGROUND INFORMATION <br /> In response to a recent fuel pipeline leak, PES conducted a preliminary subsurface investigation <br /> on September 23, 2015 along the fuel pipeline to locate the failure point and to evaluate <br /> subsurface conditions. The investigation consisted of trenching with a backhoe to expose the <br /> pipeline and observe for the presence of released fuels. By exposing the fuel pipeline in several <br /> locations, while a pipe rupture was not identified, it was determined that the pipe leak was <br /> likely located near the levee roadway. Further evaluation conducted during installation of free <br /> product/groundwater collection trench determined that first-encountered groundwater was <br /> present at least 8 feet below grade and that petroleum-affected soils are present in the <br /> unsaturated soils above the groundwater table in the vicinity of the PG&E vault and adjacent <br /> vehicle fueling pad. The likely location of the fuel line release was also better defined and <br /> appears to be on the southern edge of the raised parking area on the east side of the levee <br /> (see Plate 2). The depth of the pipeline in this area is between 3 and 10 feet below ground <br /> surface depending on location with respect to the parking area berm. <br /> 1682 Novato Boulevard • Suite 100 • Novato, California 94947-7021 • Tel(415)899-1600 • Fax(415)899-1601 <br />