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CGeofogua(T'ecFrnus Inc 2 <br /> Marci,s Diesel <br /> Work Plan Addendum <br /> 16' <br /> March 2, 2000 <br /> 1 2.1 Soil Boring <br /> Soil boring permits will be secured as necessary and the local regulatory agency will be <br /> notified 48 hours prior to commencing work The subsurface will be cleared of underground <br /> ' 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) The current depth to <br /> groundwater is approximately 55 feet below ground surface <br /> ' The location of the borings will be sighted according to the January 8, 1999 work plan and <br /> after consultation with the representative of SJC PHS/EHD <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-mch 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 /> following Chain of Custody protocol <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 />' 0 sediment type, especially grain size and clay content <br /> • 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 /> compounds with ionization potential below 10 0 eV (hydrocarbon range) <br /> 2.2 Laboratory Analysis <br /> Soil samples collected during drilling and groundwater samples collected after well <br /> installation will be tested for BTEX, TPH-G and TEPH-D as proposed in the previous work <br /> plan Samples will be sent to a licensed analytical laboratory <br /> ' 2.3 Well Top Elevation Survey <br /> A licensed surveyor will survey the top of casing elevation on the existing wells as well as <br /> ' the new wells into a benchmark elevation During review of previous groundwater <br /> monitoring reports it appears that groundwater elevations in MW-3 maybe anomalous A <br /> proper top of casing elevation survey may resolve this and provide a clearer understanding of <br /> the groundwater gradient at the site <br />