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Notes of Meeting on 28 February 1995 <br /> i <br /> Phase III Technical Memorandum. A letter would follow to PG&E with <br /> the same comments. Their main comment was that the extent of chemical <br /> constituents in groundwater was not defined in Zones A and B. The final <br /> Techncial Memorandum should include interpretation of the extent of <br /> groundwater contamination and recommendations for defining the extent. <br /> • DTSC and RWQCB asked PG&E to install additional groundwater <br /> monitoring wells,in particular, to define the non-detect groundwater <br /> contour. PG&E agreed to submit a Phase IV Groundwater Investigation <br /> Workplan. The purpose of the workplan would be to idents well <br /> locations at the edge of the groundwater plume in the A and B Zones. <br /> • Other comments to the Phase III Technical Memorandum were as follows: <br /> • The well construction diagram for well MW-19 was not included <br /> • The RWQCB requested that well construction details be <br /> superimposed on top of soil boring logs. <br /> Topic: Feasibility Study Approach <br /> Item Discussion <br /> Soil and Madeline Wall presented information on subsurface soil, shallow groundwater <br /> Groundwater beneath affected soil, and deeper groundwater conditions and reviewed risk <br /> Conditions assessment results with respect to the proposed feasibility study approach. <br /> Remediation Madeline Wall presented PG&E's proposed remedial action objectives and a <br /> Approach for remediation approach for the site that PG&E is interested in developing in the <br /> Soil and <br /> Groundwater FS. PG&E plans to fully evaluate this approach along with a full range of <br /> alternatives in the FS. The approach includes remediation of soils with higher <br /> levels of contamination to eliminate them as potential sources of groundwater <br /> degradation, with continued groundwater monitoring under contingency plan <br /> which sets forth criteria for monitoring results and specified actions if criteria <br /> are exceeded. <br /> • DTSC and RWCB stated that they wished to see a full range of <br /> groundwater treatment options in the feasibility study from natural <br /> attenuation to pump and treat. <br /> • PG&E offered to evaluate historic land use on neighboring parcels (e.g. at <br /> the neighboring fire station) and any historic pumping activity (to evaluate <br /> whether groundwater direction may have changed over time). <br /> 3 <br />