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Ms.Patricia Sullivan <br /> Page 3 <br /> July 1, 1996 <br /> conclusions are 1) site hydrogeologic conditions can now be thoroughly <br /> interpreted,2) the groundwater gradient has been characterized in all three <br /> zones as east/southeast,3)hydrologic parameters have been estimated for <br /> the site,4)the risk assessment determined there is no current risk from <br /> COPCs in soil or groundwater, 5)the extent of PNAs in Zones A and C is <br /> limited to Area I and 6)the extent of benzene in Zones A,B,and C is limited <br /> to Area I. <br /> d. PG&E's recommendations regarding the Phase IV investigation are : <br /> 1. finalize the Phase IV report two weeks after receiving agency comments, <br /> 2. continue to monitor PNAs,BTEX, and TPH in all Zone A, B,and C wells, <br /> while the FS is being prepared and finalized, <br /> 3.implement the soil remedy recommended in the final FS,and <br /> 4. monitor groundwater concentrations in Zones A,B,and C to evaluate <br /> effectiveness of the soil remedy in reducing groundwater <br /> concentrations. <br /> e. An agreement was made for PG&E to continue putting together the FS and to <br /> provide the agencies with an assumed Zone B nondetect line for PNAs for <br /> the purpose of compiling the FS. <br /> 3.0 FS Approach and Schedule / <br /> a. Patricia Sullivan presented the remedial action objectives,goals for soil and V <br /> groundwater and the points of compliance for groundwater. There were no <br /> specific agency comments on these items however Fernando wanted to <br /> clarify DTSC's position that nondetect in groundwater is a starting point for V <br /> evaluating alternatives in the FS. Patricia said that the FS would be a very <br /> different document if we had to prove that nondetect was not feasible rather✓ <br /> that to look at the entire range of goals with respect to the range of criteria. <br /> Fran quoted the NCP guidance screening process which compares <br /> alternatives to the nine criteria. Nancy added that the ARARs,which the <br /> groundwater goals are a part of,are only one of the nine criteria. PG&E said/ <br /> they would be evaluating the range of goals equally. <br /> Philip said the State Board has not approved alternate points of compliance <br /> and at this time and consequently the RWQCB is currently not accepting <br /> alt ate points of compliance. <br /> Fran asked if we are considering determining whether natural attenuation is <br /> occurring. Tricia and Paula mentioned that the first set of intrinsic <br /> degradation data was collected during the quarterly sampling event in June. <br />