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41 <br /> Former Countryside Market, Stockton,California <br /> Feasibility Study and Interim Remedial Action Plan May 20,2013 <br /> 6.2.4 Testing Results Utilization and Interpretation <br /> The CPT results will be incorporated into the CSM and presented as part f the final RAP for the Site. <br /> Data to be presented will include CPT plots to identify the hydrogeologic zones and related groundwater <br /> analytical results from these various zones. Since it is not always feasible tp clearly discern the soil type <br /> in the subsurface using CPT sounding data, some degree of interpreta ion of cone bearing, sleeve <br /> friction, and penetration pore pressure data will likely be necessary. The data interpretation is based on <br /> experience,judgement, and additional lines of evidence such as a pore pressure dissipation test(PPDT), <br /> which can be used to support or refute the identified SBT data. <br /> 6.3 Sparge Well Sampling <br /> In addition to groundwater monitoring and sampling at depth-discreet intervals during the CPT <br /> assessment, SGI will collect groundwater samples from each of the proposed AS wells presented in the <br /> following section (Section 7.0) prior to conducting feasibility testing activitie and implementing the TRAP. <br /> Since all of the AS wells will be discreetly screened approximately 10 to 15 feet into groundwater, the <br /> sampling results will help to further delineate the vertical extent of the plu e. Based on the analytical <br /> data, additional sampling may be proposed to further assess the extent to hich VOCs may be present <br /> below the groundwater table. <br /> The AS well samples will be collected utilizing low flow sampling technigIes, and analyzed for TPHg, <br /> BTEX compounds and oxygenates (TAME, TBA, EDB, 1,2-DCA or EDC,I DIPE, ETBE and MTBE) by <br /> EPA Method 8260B in the same manner as the existing monitoring wells. The CRWQCB will be notified <br /> in advance of the AS well monitoring and sampling event with the rsults being included in the <br /> appropriate quarterly report. Conclusions and recommendations concer:iing all of the above vertical <br /> plume delineation findings will also be provided. <br /> Feasibility Study atd IFeasibility Study&IW Tied Final dx 6-3 The Source Groom Inc. <br />