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I 4 Protect No 014-95262 16' Page No 7 7.1.3 Brine Tank Vjcini#y One sample (KHA-6) was collected from a small (3x3 feet x 3 5 feet deep) concrete-walled vault with an earthen floor located between the brine tank and the main building wall The vault contains an approximate 4 inch diameter dram line with flapper-style check valve The line is oriented east-west and protects beneath the building An interview with a Safeway employee suggested this waste line connected to the other wastewater lines which eventually terminate at the on-site wastewater treatment plant One sample was collected at a depth of 6 to 12 inches below the bottom of the vault(4 5 feet below surrounding grade) No analysis for TPH-D, TPH-G or BTEX was conducted Instead, the sample was analyzed for electrical conductivity, nitrate, and chloride Analytical results were 150 µmhos/cm EC and 12,000 mg/kg chloride Nitrate was not detected 7.2 Exploratory Six exploratory soil borings were advanced at particular areas of the site The soil boring designation and related areas of investigation are listed below KB-1 Brine spill area KB-2 Background KB-3,4 Potential leakage from wastewater treatment pond KB-5 Potential leakage from clarifier KB-6 Potential Ieakage from sump The chemical data from samples collected from the borings (Table 2) was used to determine if site activities had affected soil quality or potentially affected groundwater quality Also, data from boring logs was used to interpret site geology, including its variation throughout the project site 7.2.1 Soil Profile The basin deposits that comprise the subsurface profile at the project site consist predominantly of clays, with lesser silt and very minor sands (see Appendix A for copies of the boring logs) In general, review of the logs shows a silty clay to predominate from surface to 10 to 12 feet bgs A silty unit was often present from this depth to 15 to 20 feet bgs Below this depth, silty clays or clayey silts and occasionally a sandy unit were present to the limit of the borings at 25 feet bgs The subsurface material was generally noted as being damp from surface to the 20 to 25 feet depth interval -- samples below that were logged as moist The water table was approximately 25 feet bgs at the KRAZAN& ASSOCIATES, INC Offices Serving the Western Unied States 95262 P52