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ti, r <br /> 2402 Pacific Avenue <br /> Page 2 <br /> Also, PHSIEHD requests that EPA method 8260 (GC-MS) be used to confirm the FID results. <br /> You may already be aware that the State Water Resources Control Board is working with the <br /> Lawrence Livermore National Laboratory on the MTBE groundwater contamination problem <br /> and has issued some guidance regarding laboratory methodologies. I have enclosed a copy <br /> for your information. <br /> The report indicated that additional soil investigation was warranted to the north of the site <br /> and groundwater investigation to the north, south and west of the site, using direct push <br /> technology. PHSIEHD concurs that additional soil and groundwater investigation is required; <br /> however, the scope of this second phase of investigation should be greatly expanded, so that <br /> the soil and groundwater plume can be tentatively defined, pending the installation of <br /> permanent monitoring points. <br /> The laboratory noted that numerous sample results were observed within the "diesel" range <br /> but were more representative of gasoline. These types of notations should be included on <br /> the summary tables of results. Also, quality control data sheets must be included with all <br /> laboratory reports. Please submit quality control data for the samples which have already <br /> been analyzed. <br /> Contaminated stockpiled soil and drummed water are currently stored in an open area <br /> instead of in a fenced area. Disposal of contaminated soil and groundwater should be <br /> scheduled immediately. Please submit a brief disposal plan indicating how you propose to <br /> manage wastes generated at the site. <br /> The work plan for the additional soil and groundwater investigation should be submitted by <br /> November 27, 1996. <br /> Please note that PHSIEHD must be contacted at least two working days prior to initiating any <br /> field activities. If you have any questions or comments, please do not hesitate to contact me <br /> at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary Meays, Senior REHS Margaret agorio, REHS <br /> Site Mitigation Unit Supervisor <br /> MM12402PAC <br /> Enclosure <br /> cc: Elizabeth Thayer, CVRWQCB <br /> SWRCB Cleanup Fund Unit <br /> Tim Cuellar, Advanced GeoEnviron mental <br />