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#q Chuck Carmel Page 2 7. PHS/EHD encourages you to continue negotiations with Chevron to share information. PHS/EHD files are public record and PHS/EHD encourages you to review Chevron's files. The possibility that the groundwater extraction system may be influencing the migration of contamination should be explored. A meeting has been scheduled January 28, 1992 at 10:00 AM between ARCO, Chevron, PHS/EHD, and the Central Valley Regional Water Quality Control Board (CVRWQCB). The meeting is to be held at the offices of the CVRWQCB, 3443 Routier Rd., Sacramento, CA. S. The PHS/EHD letter dated April 22, 1991, requested that a workplan be submitted by June 3, 1991, for the additional investigation necessary to establish groundwater contamination boundaries. During the April 22, 1991 and June 20, 1991, telecommunications with ARCO representative, Chuck Carmel, PHS/EHD agreed to allow two quarters (the quarters in question are: May- July and July- October) of groundwater monitoring to evaluate the effectiveness of the groundwater extraction system before commencing the next phase of investigation. The next phase of investigation should include, but not be limited to, the installation of monitoring wells on the west side of the property to better define "zero" lines. As previously mentioned, contamination appears to have increased during the July sampling. We have not received data from the October 1991 sampling, however, we believe ARCO should begin preparing a workplan to adequately define the extent of the groundwater contamination and submit this workplan by March 31, 1992. 9. An addendum to the Draft Final Remediation Plan, to address soil contamination, was requested for submittal December 2, 1991. The ARCO letter requested an extension to June 1992. This request is denied. A soil vapor survey was conducted and reported April 1987 which identified extensive soil contamination at 4 feet and 10 feet. Continue plans to conduct a soil vent test to assess the feasibility of a vapor extraction remediation system. Submit an addendum to the Draft final Remediation Plan addressing soil contamination by March 31, 1992. If you have any comments or questions please contact Mary Meays, RENS, of my staff at (209) 468-3441. Jogi Khanna, M.D., M.P.H. Health Officer) r////Environ=jenta1 . Cotulla, RENS, Program Manager Health Division LAC/MM:lb f Elizabeth Thayer, CVRWQCB ✓c: Steve Misner, Brown and Caldwell c: Frank Tucker, City of Stockton Municipal Utilities.