SITE INFORMATION AND CORRESPONDENCE FILE 2

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Rodger Liston - Darpetro Inc. 749 E. Charter Way, Stockton, California 'I Page 3 of 3 Also, state in the plan the laboratory analytical regime to be followed for the samples, the containers to be utilized for the samples , how the samples will be transferred into the containers, and other pertinent details related to the ground water sampling events. As EHD's previously stated goal of having an approved ground water monitoring and sampling plan in place prior to the next quarterly monitoring event still holds, the revised plan is still due in this office by 21 June 2004. Please have all the issues noted in this letter, and any other pertinent issues properly and adequately addressed . Amended Quarterly Report October 2003 was submitted in response to an EHD directive issued in the 13 April 2004 letter. EHD directed the revision due to numerous deviations from the protocols, including use of a pump and a sampling bailer that were not decontaminated before use in each well, as was noted in the EHD 13 April 2004 letter. The original report did note use of a contaminated bailer, but stated that the pump was decontaminated — the latter point in error. The EHD directive was issued for your consultant to correct this error. However, the amended report now states that both the pump and the bailer were decontaminated and refers to the protocols. Referral to the protocols to describe field procedures is acceptable if the protocols are applicable and are followed closely with all deviations from the protocols noted . In this case, the protocols were not followed closely, deviations were not noted , and the report falsely states the equipment was decontaminated . This may have a very significant impact on data quality. It is the responsibility of the person having responsible professional charge of the work to ensure that all procedures are followed and that deviations are accurately reported so that the resulting data can be fairly evaluated by other workers or reviewers. The 08 May 2004 amended report is :not acceptable to EHD Please have the third quarter 2003 report re-corrected and reissued . The revised report must be submitted to this office no later than 01 June 2004. Also, please be aware that the field procedures utilized for the first quarter 2004 monitoring event, which included many deviations from the protocols as noted by EHD , must be accurately reported . If there is any confusion on any of these issues , please call the undersigned for clarification . EHD desires to assist you and/or your consultant in this matter as much as possible. EHD would rather spend time helping the consultant properly address the issues than spend excessive time reviewing and commenting on an incomplete and/or inadequate work plan . Questions or comments may be directed to Nuel Henderson at (209) 468-3436. Donna Heran, REHS, Director Environmental Health Division Nuel C. Henderson, Jr. , RGMarga, RE ` Unit IV - Site Mitigation Unit IV Supervisor cc: James Barton - CVRWQCB John Cussen — California Geophysical Group, Inc. Mark Owens — SWRCB Cleanup Fund