SITE INFORMATION AND CORRESPONDENCE 1991-1992

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Mr. Val F. Siebal -2- January 15, 1991 r � • The RI/FS field investigation began on December 15. By the end of December, six borings had been installed on the PG&E property, three borings on the Morton Paint Company, and two background borings. Soils were logged and samples sent to the laboratory for chemical analyses which are currently pending. (b) Technical Activities Expected in Current Quarter During the current quarter, January to March 1992, PG&E anticipates completing the proposed field investigation activities. After well installation is complete, slug tests will be conducted and water levels will be measured on a monthly schedule. Field data will be evaluated and Phase 2 field activities required, if any, will commence. The letter report, "IRM - Report of Findings and Recommendations" will be submitted to DTSC on January 15, 1992. After DTSC approval of the report, implementation of the selected remedial measure will begin. Encroachment permits will be obtained from City of Stockton - Public Works for surface work; other permitting requirements will be identified if necessary. (c) Technical Activities Planned for Next Quarter During the quarter from April to June 1992, PG&E expects to complete any required Phase 2 RI field work, and to prepare the draft RI report. Monthly groundwater level and quarterly groundwater quality monitoring will proceed. Preliminary assessment of feasible remedial alternatives will begin. Implementation of the IRM recommendations should be completed. (d) Problems or Anticipated Problems in Complying with Order No significant problems are anticipated in complying with the requirements of Order. Small communication problems were encountered during the previous quarter which resulted in delays and duplicated work effort. To avoid such problems in the future, PG&E and DTSC staff have agreed to hold monthly meetings to review and discuss written correspondence and progress of various activities. A new schedule has been submitted with the final modifications of the RI/FS Workplan. (e) Results of Analyses. Tests. or Other Data Chemical analyses of surface soils from the Hazelton Avenue strip and background locations were received by PG&E at the very end of the previous quarter. Dry weight total PNA concentrations ranged .from 1 to 113 mg/kg in background samples and 6 to 234 mg/kg in Hazelton Avenue strip samples. One sample from the strip had a dry weight concentration of lead (1400 mg/kg) above the TTLC (1000 mg/kg) . No other analyses were above regulated levels or the estimated background range. These results will be discussed in the letter report, "IRM - Report of Findings and Recommendations" which will be submitted to DTSC on January 15, 1992.