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Underground Storage Tank Removal Report and Work Plan for Monitoring Well Installation 6 <br /> Southland Store#17334,4501 North Pershing Avenue,Stockton,California October 27, 1998 <br /> hydrocarbon and oxygenate concentrations detected In the sod samples collected beneath the former <br /> USTs The boring will be drilled to approximately 40 feet below ground surface (BGS), and will provide <br /> additional Information to characterize and delineate the extent of the soil hydrocarbon plume Permits <br /> for the drilling will be obtained from the SJCPHS <br /> Soil samples will be collected from the sod boring at 5-foot Intervals to a total depth of 40 feet BGS <br /> beginning at 5 feet BGS using a split-spoon sampler lined with 2-inch-diameter by 6-inch-long brass <br /> sample tubes The hollow-stem augers will be steam cleaned before drilling, and sampling equipment <br /> will be cleaned between each sampling Interval Each sod sample will be screened for hydrocarbon <br /> vapors using a photoionization detector(PID) Soils encountered during drilling will be logged using the <br /> Unified Soil Classification System by a Fluor Daniel GTI field geologist, working under the supervision of <br /> a California registered geologist One sample tube from each sampling interval will be sealed with <br /> Teflon sheets, capped, taped, labeled, and placed on ice in an Insulated container <br /> Based on field observations, selected soil samples from the borehole will be analyzed by a <br /> State-certified analytical laboratory for BTEX, MTBE, and TPH-G by EPA methods 8020/8015 modified <br /> and the oxygenates TBA, MTBE, DIPE, ETBE, TAME by EPA Method 8260 An estimated four sod <br /> samples will be analyzed from the boring <br /> All soil generated through drilling will be placed in Department of Transportation (DOT)-approved <br /> 55-gallon drums pending characterization and disposal Water generated by steam cleaning will be <br /> temporarily stored on site in DOT-approved 55-gallon drums pending characterization and disposal All <br /> waste will be disposed of as non-hazardous at a certified facility by a licensed hauling firm <br /> 62 Well Construction/Development/Gaugi ng/Sampling <br /> A double-nested groundwater monitoring well will be constructed in the boring of two 2-inch diameter <br /> Schedule 40 poly-vinyl-chloride (PVC) casings with flush threads and 0 020-Inch-slot well screen The <br /> deeper well screen will be installed from approximately 38 to 40 feet BGS A sand filter pack will be <br /> placed around the well screen to a maximum height of 1 foot above the top of the screen The casing <br /> will be sealed with 3 feet of hydrated bentonite pellets from a depth of 37 feet to 34 feet BGS Prior to <br /> construction of the shallow well screen the bentonite will be allowed to expand and set up prior to <br /> adding sand for the shallow well screen The shallow well screen will be installed from a depth of 13 to <br /> 33 feet SGS A sand filter pack will be placed around the well screen from 34 feet to a maximum <br /> height of 1 foot above the top of the screen The screen will be seated with 2 feet of hydrated bentonite <br /> pellets, followed by a neat-cement grout to grade containing a mixture of 95 pounds of Portland Type <br /> 1/II cement to 5 gallons of clean water The wellhead will be protected at the surface by a locking, <br /> expandable cap and traffic-rated street box(with watertight bolted lid) set in concrete The well will be <br /> used to characterize and delineate the vertical extent of dissolved petroleum hydrocarbons <br /> 97334ust rpt <br /> FLUOR DANIEL GTI <br /> CJ <br />