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0 6n 0 a _a a CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD • CENTRAL VALLEY REGION 3443 Routier Road Phone: (916) 361-5600 Sacramento, CA 95827-3098 ATSS: 8-495-5600 TO: Antonia Vorster FROM: Gary Reents Senior Engineer Project Engineer DATE: 7 January 1988 SIGNATURE: SUBJECT: MC CORMICK AND BAXTER QUARTERLY REPORT SUBMITTALS, SAN JOAQUIN COUNTY CH2M Hill , on behalf of McCormick & Baxter (MB) , submitted a Quarterly Report with analytical results dated 21 October 1987. Also submitted were a Preliminary Site Assessment for Dioxins Work Plan, On-site Wells Work Plan, Tank and Sump Integrity Report, preliminary Community Relations Plan, and Stockton Regional Wastewater Control Facility (SRWCF) Assessment Work Plan, dated October 1987. All of the documents were submitted pursuant to the "Work Plan for Completion of the Site Assessment Plan and Pollution Control and Mitigation Plan. The Quarterly Report and On-site Wells Work Plan are a summary of work performed and data collected during the period from July through October 1987. The rest of the submittals are self-explanatory. After review, I have no comments regarding the Quarterly Report, On-site Wells Work Plan, and preliminary Community Relations Plan. My comments regarding the remaining documents, segregated by copy topic, are as follows: Tank and Sump Integrity Report 1. The on-site sumps are presently (or will be) inspected. Further actions may be assessed in the Feasibility Study stage as proposed. The three under- ground tanks, however, should be either permitted or removed at this time as required by Title 23 regulations and Local Health District requirements. Results of these actions should be reported as part of the Remedial Investi- gation actions. 2. The Appendix A tank testing data does not contain testing results, only information sheets. Dioxin Work Plan 1. A sample of the raw stock Pentachlorophenol should be analyzed for Dioxins as a baseline and to confirm the reported literature values. SRWCF Assessment Work Plan 1. I strongly agree that careful QA/QC for sampling and analysis should be applied at the SRWCF to resolve existing data discrepancies. This will require coordinated efforts by CH2M Hill , McCormick & Baxter, the City of Stockton, and both DHS and the Regional Board. A meeting between all the concerned should be held as soon as possible, especially since the City is presently proposing additional sludge sampling and analysis for Dioxins.