SITE INFORMATION AND CORRESPONDENCE

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r March 18, 1998 DRAFT Mr. Luis Lechich Valley Showcase P.O. Box 881 Stockton, CA 95201 Subject: Valley Showcase 913 W. Fremont Street Stockton, California COST ESTIMATE FOR PILOT TEST STUDIES AND CORRECTIVE ACTION PLAN Dear Mr. Lechich: JJW Geosciences Inc. is pleased to present this cost estimate for performaince of remediation pilot test studies and preparation of a Corrective Action Plan for the above- referenced site. A detailed cost breakdown has been provided in the accompanying Cost Estimate Worksheet. A copy of JJW Geosciences 1990 Fee Schedule has also been included. At the request of Mr. Bill Hunter, of William Hunter&Associates, JJW Geosciences has reviewed the work performed at the s4e to-date. We then discussed our findings and conclusions with both Mr. Hunter, and with Mr. Steve Sasson and Mr. Jeff Wong, of the San Joaquin County Environmental Heath Division (San Joaquin County). Results of our review suggests that further work is needed at the site before case closure can be considered Mr. Sasson and Mr. Wong have both indicated their concurrence with this assessment. This conclusion is based on the following: • Recent groundwater sample results have suggested the possible presence of contamination in monitoring well MW-4, the down-gradient control well. In reviewing the historical groundwater data for the site, JJW Geosciences concurs with Mr. Hunter that groundwater samples and/or sample results for monitoring wells MW-3 and MW-4 may have been transposed. JJW Geosciences recommends that split samples from these two wells be submitted to independent laboratories during the next sampling episode to better ascertain whether well MW-4 has truly been impacted. Should subsequent sampling confirm that well MW4 has been impacted, then it would provide conclusive evidence that the groundwater contaminant plume is expanding, as suspected.