SITE INFORMATION AND CORRESPONDENCE

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_ xF G 6 f PHS/EHD approved geophysical sample collection and laboratory analyses in the April 7, 1997 workplan (GT, Section 5.0 Geotechnical and Geochemical Testing) to better understand the fate and transport mechanics in the subsurface. The April 7, 1997 Workplan by GT recognized the need to "provide critical site specific information for risk assessment modeling." Geological Technics failed to request cost pre- , approval for this particular scope of work, therefore, no data was generated to assist this agency or the CVRWQCB in developing a site specific conceptual model for risk to water supply wells. As stated in the amended GT report "The survey included a review of records at SJCPHSEHD and the State of California Department of Water Resources (DWR) and a visual inspection in a 1000 foot radius". The GT report did not identify any wells in the area. PHS/EHD performed a similar records review and visual inspection and found more than ten water wells in the area including small water system wells permitted and routinely inspected by PHS/EHD. The GT survey and report (Addendum to the August 31, 1998 Monitoring Report) are incomplete, inaccurate and must be amended. PHS/EHD directs the responsible party to amend the incomplete well survey and submit the amended report findings to PHS/EHD by October 15, 1999. PHS/EHD recommends that the responsible party perform a downhole video log in the on-site domestic well complete with a formal written review of the downhole log by a competent and qualified professional. The video log must thoroughly evaluate the water supply well for vulnerability to contaminants by inspecting the condition of the well (casing integrity, total depth, annular seal etc.). In the event the - condition of the well is found to be inadequate to protect long term health and safety a new drinking water well should be proposed as no municipal water supply options are available. Limited remediation of the existing plume may be required to protect the old or new on-site well. Please submit a workplan to PHS/EHD to further evaluate the vulnerability of the existing on-site drinking water supply well by October 30, 1999. PHS/EHD recommends that all site assessment and remediation related activities in which the responsible party(s) engages in and anticipates reimbursement from the Underground Storage Tank Cleanup Fund(USTCF)follow the required three bid process, be reviewed and approved at the local level(PHS/EHD)and cost pre-approved by the USTCF prior to commencing work. Should you have questions regarding this correspondence please contact Ron Rowe at(209)468-0342. Donna Heran, REHS, Director �Environmental \Health Division V Ronald Rowe, Sr. REHS Margare�Supervisor Site Mitigation Unit Site Mitigation Unit Word/7474Eleventh Directive Ltr i 2 ` 1