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located within a large area that is contaminated, reme- <br /> diating of soils contamination just in the immediate <br /> area of the tank would be impractical at this time. In <br /> addition, the tank located adjacent to above-grade pro- <br /> cess equipment which would make removal of the tank <br /> difficult. To account for these conditions and be in <br /> compliance with underground tank closure requirements, <br /> agreement was reached between the RWQCB, DHS, County, <br /> and M&B to provide a interim closure solution. The <br /> tank inside surface will be cleaned, filled with sand, <br /> and the tank inlet/man-way capped with concrete. In- <br /> terim closure in this manner will provide a clean tank <br /> that could be removed permanently in the future with <br /> minimum difficulty. Remediation of soils adjacent to <br /> and under the tank will be included in feasibility <br /> studies and remedial action plans for the process area <br /> remediation. <br /> 2 . Problems Identified <br /> None <br /> 3 . Activities Next Quarter <br /> M&B will submit a permit application to the County for <br /> interim tank closure. <br /> 4 . Schedule for Completion <br /> Interim tank closure will proceed after the County per- <br /> mit is obtained. <br /> TASK 15--SRWCF ASSESSMENT <br /> 1 . Progress Made This Quarter <br /> A Technical Memorandum/Data Report has been prepared <br /> (submitted separately in August 1988) presenting an <br /> updated analysis of the third and fourth quarters data <br /> and laboratory data sheets . The data indicates McCormick <br /> and Baxter' s discharges are being effectively treated <br /> by the SRWCF. Stormwater runoff data show the levels of <br /> pentachlorophenol and creosote constituents in the <br /> stormwater have continued to decline. The decline in- <br /> dicates process improvements and remedial measures have <br /> been effective in controlling onsite pollution. The <br /> total decrease, from the stormwater monitoring that <br /> began in the fall of 1984 to the latest winter/spring <br /> 1988 data, is a decrease of pentachlorophenol from <br /> 19 . 5 mg/1 to about 1 .3 mg/1 (93 percent) and creosote <br /> constituents (PAHs) from . 89 mg/l to nondetectable <br /> (1.03. mg/1) levels (98+ percent) . <br />