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Jim Tjosvold <br /> Page 6 <br /> July 3 , 1987 <br /> 28 . The last two sampling intervals for the new Mormon Slough <br /> should be extended to 200 feet. <br /> 29 . Descriptions of sample preparation and extraction methods <br /> for sediment samples must be provided. The percent <br /> moisture content must be measured and reported. <br /> 30. Information on the extent of contamination near soil <br /> boring SB-21 has not been provided to the Department. <br /> Unless a full description (origin, horizontal, and <br /> vertical extent) can be provided, further sampling in <br /> this area will be required. <br /> 31. McCormick and Baxter has not included any description or <br /> investigation of the underground railroad tanker in <br /> Task 10. This tank was used for storage of creosote and <br /> if the tank has leaked in the past, remaining soil <br /> contamination may serve as a source of groundwater <br /> contamination. McCormick and Baxter must provide a plan <br /> for soil sampling below the tank as part of the site soil <br /> characterization. <br /> 32 . The name of the laboratory for dioxin analysis has not <br /> been submitted. This laboratory must be approved by the <br /> State of California for dioxin analysis. <br /> 33 . Dioxin analysis by EPA method 8280 is strictly for 2 , 3 , <br /> 7, 8 tetrachlorodibenzo-p-dioxin. Analysis for 2 , 3 , 7 , <br /> 8 substituted isomers and homologs must be provided under <br /> the direction of the State Hazardous Material Laboratory <br /> (HML) . Prior to sampling, CH2M Hill and their contract <br /> laboratory must contact HML at (415) 540-3003 for proper <br /> procedures and method analysis. <br /> PHERA <br /> 34 . In addition to modeling the transport and fate analysis <br /> for chemicals, there should be analytical testing to <br /> support the hypothesis. <br /> SRWCF Treatability Assessment <br /> 35 . Samples from the storm water ponds should include <br /> effluent as well as the influent. In addition to <br /> monitoring levels being discharged to the SRWCF, the <br /> results will resolve previous discussions regarding <br /> degradation of PCP in the ponds. <br /> 36 . If discharged storm water from the ponds is to be <br /> analyzed for dioxin, samples should be collected when <br /> sediment transport (turbidity) is maximum. <br /> 37 . The concentrations of contaminants in the sediment and <br /> water phases of the influent and effluent to the storm <br />