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" Gect e ca(Technics Inc. Page 2 <br /> Additional Site Characterization Work Plan <br /> Marei's Property <br /> March 21,2000 <br /> 2.1 Soil Boring Installation <br /> Soil boring/monitoring well permits will be secured as necessary and the local regulatory <br /> agency will be notified 48 hours prior to commencing work. The subsurface will be cleared <br /> of underground utilities by notifying Underground Service Alert. <br /> The soil borings will be drilled using an 8-inch outside diameter, continuous flight, hollow <br /> stem auger owned and operated by V&W Drilling (C574 720904). <br /> V <br /> Soil samples will be collected for geological and analytical evaluation at 5-foot intervals. A <br /> boring log providing sediment description using the USCS and field observations will be <br /> �. maintained by a professional geologist working under the supervision of a registered <br /> geologist. Soil samples will be collected in 6.0-inch brass liners using a 2.0 inch modified <br /> California split spoon sampler. All soil samples will be sealed with Teflon, capped with <br /> Teflon end caps, labeled and placed in a cooler at 4° Celsius for transport to the laboratory. <br /> Since only selected soil samples will be submitted for laboratory analysis, a screening <br /> process will be used to gather additional information through field observation including: <br /> �- • sediment type, especially grain size and clay content <br /> 0 moisture content <br /> visible evidence of contamination, i.e., color change due to reduction of iron or <br /> discoloration from hydrocarbons and other pollutants <br /> • readings above background on a organic vapor meter (OVM) <br /> The OVM is a portable photo ionization detector that uses a 10.0 eV lamp to detect <br /> `w compounds with ionization potential below 10.0 eV (hydrocarbon range). <br /> 2.2 Monitoring Well Construction <br /> La <br /> Well borings will be drilled using a 8.00 inch outside diameter continuous flight hollow stem <br /> auger owned and operated by V&W Drilling (C57# 658786). Soil cuttings will be stockpiled <br /> on site and underlain and covered with plastic. <br /> The monitoring wells will be constructed using 2.0 inch diameter PVC casing with flush <br /> threads. The screened interval for the water table wells will extend from five feet above to <br /> �- ten feet below the water table. Should installation of the deep well become necessary, it shall <br /> be discretely screened with a 2.5 to 5 foot long screen at a depth of approximately 95 feet. <br /> Final construction will be determined in the field by the onsite geologist and the <br /> representative from San Joaquin County. Groundwater is expected to be around 60 feet deep. <br /> If a significant clay unit is encountered during the drilling of a well, the well may be seated <br /> no greater than 3 ft into that fine grained unit. A 43 sand filter pack will surround and extend <br /> two feet above the 0.020" screened interval. A granular bentonite transition seal will be <br /> installed and hydrated. A surface seal will be achieved by pumping a neat cement grout <br /> (augmented with < 4% bentonite) via a tremie tube. Each of the wells will be secured with <br /> �. locking watertight cap encased in flush mounted traffic rated well box. <br /> A licensed land surveyor will survey the top of casing measuring point for each well into a <br /> known benchmark elevation. A properly sealed site map will be prepared at this time. <br />