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Geological Technics Inc. Page 5 Bank of Stockton-Western Lift Remedial Feasibility Study-Work Plan Project#358.3 September 28, 1995 2.4 Soil and Water Analyses ' Based on field screening observations one soil sample from the capillary fringe will be submitted to Sherwood Laboratories of Hilmar (State Certified Laboratory #1400) ' and analyzed for benzene, toluene, ethylbenzene and xylene (BTEX by EPA method 8020), and diesel range petroleum hydrocarbons analyses (TPH-Gasoline by EPA method 3540/8015m). The detection limits for these compounds are listed below. ' A Chain of Custody will be completed for all samples collected and tracked to ensure sample integrity. ' Water samples will be tested for BTEX using EPA method 602 and TPH-Gasoline using EPA method 3510/8015(m). The detection limits for these compounds in soil and water are listed in the following table: Detection Limits: BTEX TPH-G&D Water ( /L) 0.3 50 Soil ( /K ) 3.0 1,000 Samples of the recovered ground water will be tested in the field for the dissolved oxygen content. This information will be used to help determine if bioventing will increase the activity of aerobic bacteria in the subsurface. ' 3.0 PILOT BIOVENTING / SOIL EXTRA VAPOR I Y O EXTRACTION SYSTEM TEM TEST The purpose and goal for a bioventing / soil vapor extraction system (BV/SVES) pilot test is to gauge the pneumatic conductivity of the subsurface and to determine ' the radius of influence of the extraction well at a given extraction rate. Information will also be gathered pertaining to oxygen availability to microorganisms in the groundwater that could aid in metabolization of hydrocarbons. This information would then be used to judge the feasibility for bioventing and vapor extraction remedial technology to be applied at this site. To obtain the required data and to more fully characterize the site, two additional wells (VEW-1 &2 ) will be installed. The well installation is described more fully in Section 2.1 above. One boring will be employed as a SVE pilot well while the other ' will be used as a pressure monitoring point. The pressure point (and other points) will be needed to measure the effects of the SVE well without having the data ' severely distorted by the existence of the pea gravel filled tank excavation. During the test, the respective roles of the two wells VEW-1 & 2 will be reversed. Any differences recorded in pressures of the two injector - pressure point configurations may reasonably be attributed to the thiefing effect of the pea gravel-filled tank pit.