SITE INFORMATION AND CORRESPONDENCE

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Doug O'Neal • • February 7, 2002 Page 4 • The Workplan should include step-by-step procedures for drilling, sampling, logging, well installation, and well development. • The results of well installation and development should be reported to the Department of Toxic Substances Control (DTSC) and the Regional Water Quality Control Board (RWQCB). At a minimum, the report should include: a description of field activities; copies of all field forms and notes; quantities of all well completion materials used to construct the well (sand, bentonite, casing, exact proportions of cement and water used for grouting, etc.); as-built diagrams of wells; lithologic logs; and well development records. Results of quarterly sampling should be reported with the quarterly monitoring reports required under RWQCB Monitoring and Reporting Program and the DTSC post-closure permit. RECOMMENDATIONS • The facility should revise and resubmit the Workplan for approval with consideration of these comments. To expedite the revised Workplan, GSU is available to meet with the facility via conference call or.meeting to discuss proposed well locations, the approach to the offsite investigation, and other technical issues. ■ The revised Workplan should include a description of a conceptual site model for the area south of the facility. The conceptual site model should consider all available data for the facility. This model should then be used to justify the well locations and screened intervals proposed in the Workplan. REFERENCES Cal/EPA. 1995. Monitoring Well Design and Construction for Hydrogeologic Characterization, Guidance Manual for Ground Water Investigations. July 1995. DTSC. 2000. GSU Comments on Plan for Additional Remediation, Kearney-KPF. January 25, 2000. Dudek &Associates, Inc. (Dudek). 1997. Revised Groundwater Model, Kearney-KPF Facility. May 1997. Dudek. 1998. Groundwater Characterization South of Well KI-12, Kearney-KPF Facility, Stockton, California. January 12, 1998. Dudek. 2000. Review of Annual Sampling Activities, May 2000. Keamey-KPF Site, Stockton, California. July 27, 2000. Dudek. 2001 a. Review of Quarterly Sampling Activities, April 2001, Kearney-KPF Site, Stockton, California. July 27, 2001. Dudek. 2001 b. Review of Quarterfy Sampling Activities, September 2001, Kearney-KPF Site, Stockton, California. October 16, 2001.