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Subsurface Investigation Workplan <br /> Substation,100 North Valencia Boulevard,Woodlake,California <br /> Page 2 <br /> November 8,2012—Apex personnel supervised the removal of approximately 425 cubic yards <br /> of petroleum contaminated debris,grasses and soil from the spill area by Delta Oilfield Services, <br /> Inc. (Delta). <br /> November 9,2012—The San Joaquin County Environmental Health Department(SJCEHD) <br /> transferred regulatory lead to the CVRWQCB at the end of the working day. Mr.Roberto P. <br /> Cervantes arrived on site to evaluate what activities had been done to remediate the impacted <br /> area. <br /> November 13,2012--Apex supervised additional excavation by Delta to the north and west of <br /> the initial excavation boundary. An additional 125 cubic yards of soil were removed during this <br /> phase of the excavation. <br /> December 20,2012—Apex submitted the report titled Petroleum Tanker Spill Response, Soil <br /> Excavation, and Confirmation Soil Sample Results Report, documenting emergency response <br /> and soil excavation activities at the site. <br /> March 27,2013—The CVRWQCB prepared an email requesting a workplan to define the lateral <br /> extent of subsurface contamination at the site. (Appendix A) <br /> GENERAL SITE INFORMATION <br /> Site name Williams Tanker Spill <br /> Site address 27282 Lone Tree Road, Escalon,Califomia <br /> Responsible party Williams Tanks Lines, Inc. <br /> Current site use County drainage canal <br /> Current phase of project Site characterization <br /> Tanks at site None <br /> Number of wells None <br /> SOIL BORING ADVANCEMENT <br /> Apex proposes to advance five direct push soil borings(B-1 through B-5) at the subject site to <br /> first encountered groundwater. Based on neighboring properties,groundwater is expected to <br /> occur between 65 and 70 feet below grade surface(bgs) and the groundwater gradient is to the <br /> South-southeast. The five direct push borings will be used to evaluate the lateral and vertical <br /> extent of petroleum hydrocarbon impacted soil and groundwater. The locations of the proposed <br /> direct push borings are shown on Figure 3. Apex personnel may modify the total depth of the <br /> borings as site conditions warrant. <br /> Locations of the proposed soil borings B-1 through B-4 have been selected based on the location <br /> of the petroleum spill and proposed soil boring B-5 is to investigate the lateral migration of <br /> petroleum hydrocarbons in groundwater. The proposed soil borings(B-1 through B-4)will aid <br /> in quantifying any residual petroleum-related contamination in the soil at the site along with soil <br /> samples collected during the excavation activities. <br /> Soil samples will be collected continuously for logging purposes and up to three soil samples and <br /> one discrete groundwater sample will be collected from direct push soil boxings B-2 and B-5. Tia <br />