SITE INFORMATION AND CORRESPONDENCE FILE 2

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Chevron #9-4054 (former) page 2 2103 Country Club Blvd., Stockton. EHD appreciates your detailed evaluation of the site and considers the report to accurately represent the data collected to date. The evaluation of remedial alternatives is consistent with current remedial activities in this local area and EHD agrees that limited soil over-excavation to 23' bgs could remove a significant secondary source of contamination. The CAP is approved with the following conditions: • Wells "EW-1" and "EW-2" shall be destroyed by over-boring to full depth and backfilled with a non-hardening bentonite material only and, • After over-excavation is complete, at least two conductor casings shall be placed vertically in the pit prior to installation of the gravel materials. A watertight cap is to be place on top of each conductor casing and a traffic rated box is to be installed protecting each conductor casing installed. Future vertical investigative wells, including a monitoring well with a short screened interval at —78' bgs, is to be installed thru one of these conductor casings. The report of findings for the over-excavation shall include the details for these casings. Chevron is cautioned that a link between the A-zone and B-zones has not been clearly identified and impact to the C-zone is unresolved. EHD considers the remediation of the shallow soil contamination to be important enough to approve before full site delineation has been accomplished. Chevron is to take assertive steps to complete this remedial phase quickly, evaluate the need for additional remedial actions, and submit their conclusions to EHD in a timely manner. California UST Regulations require that the public be advised of corrective actions and offered an opportunity to comment on the proposal before it is enacted. Please submit an Executive Summary to EHD so that the public notification period may begin. The Executive Summary should be a single paged, non-technical document written on non-letterhead paper that clearly summarizes: 1) why this corrective action is needed, 2) what it is you plan to do, 3) how long it will take to complete the corrective action, and 4) what protections to the public will be provided. It has been the experience of EHD that when an Executive Summary simply and clearly discusses these points, enactment of the work proceeds without resistance or the need for a public hearing. After EHD has approved the Executive Summary, the site will be posted and a period of time will be provided for the public to comment. During this period, the "EW" well destructions may proceed. The corrective action (over-excavation) cannot be performed until the public notification period has ended and EHD provides final approval of the CAP. After the comment period is completed, EHD will advise you of the need for a public hearing or if you may proceed with the over-excavation.