SITE INFORMATION AND CORRESPONDENCE

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`.w 2402 Pacific Avenue Page 2 October 1997 It was interesting to note that in evaluating the results of the biological testing that was performed on the sample collected at 25 feet bgs during the installation of VW2, it was suggested that there may be a degree of biotoxicity that may be exerting an influence locally,as evidenced by the absence of viable heterotrophic microbes which should have been present given the physiochemical conditions characterized at the site. PHS/EHD understands the necessity to move forward with the evaluation of remedial alternatives and concurs that active remediation of the site will be necessary. However,additional investigation will be required so that the full extent of contamination may be addressed cost effectively within the scope of the corrective action plan. The drilling permit 912780 issued on June 13, 1997 to Mitchell Drilling is still valid, if this is the contractor which will perform the proposed on site field activities. 1f not,please submit a permit application and$89 fee for an another on site drilling permit. Also,please proceed with efforts to obtain pre-approval from the State Water Resources Control Board Clean-up Fund Unit, for the proposed field work to ensure that the costs will be reimbursable. Once again,PHS/EHD requests that you consider completing the required investigation,as much as possible, during this next phase of field work. PHS/EHD is aware that it generally takes a considerable amount of time to secure all of the necessary off site access agreements,therefore,the field work for on site work should be scheduled as soon as possible so that the corrective action plan can be prepared. Any additional offsite work,besides the installation of a monitoring well to the south of the site,can be scheduled at another time and may be incorporated into the corrective action plan as addendum. Once the proposed field work is completed,please contact PHS/EHD to discuss the selection of soil samples which will undergo analysis The results from the sampling of the stockpiled soil indicated that the soil was contaminated with 3.8 ppm total petroleum hydrocarbons as diesel;however,no gasoline or volatile gasoline contaminants were detected. PHS/EHD concurs with the recommendation to spread the stockpiled soil over the site which is not paved. Please proceed with efforts to dispose of the drums containing contaminated waste water in a timely manner. If you have any questions,please do not hesitate to contact me at (209)468-0337. Donna Heran, RENS, Director Environmental Health Division AREHTV_� S Margare agorio, Site Mitigation Unit Supervisor cc: Pat Anderson,CVRWQCB Martin Clark, SWRCB Cleanup Fund Unit Tim Cuellar,Advanced GeoEnvironmental