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Geafor6 7echntcs Ync • Page 2 <br /> Additional 5tte Characterization Work Plan <br /> Marci'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 (C57# 720904) <br /> Soil samples will be collected for geological and analytical evaluation at 5-foot intervals A <br /> t' boring log providing sediment description using the USCS and field observations will be <br /> w 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 /> 1 process will be used to gather additional information through field observation including <br /> 0 sediment type, especially grain size and clay content <br /> 0 moisture content <br /> ' • visible evidence of contamination, 1 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 /> compounds with ionization potential below 10 0 eV (hydrocarbon range) <br /> 2.2 Monitoring Well Construction <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 #3 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 scaled site map will be prepared at this time <br />