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CGeo4icafTecknics Inc. �/ 2 Marci's Diesel Work Plan Addendum March 2, 2000 2.1 Soil Boring Soil boring permits will be secured as necessary and the local regulatory agency will be notified 48 hours prior to commencing work. The subsurface will be cleared of underground utilities by notifying Underground Service Alert. V The soil borings will be drilled using an 8-inch outside diameter, continuous flight, hollow stem auger owned and operated by V&W Drilling (C57# 720904). The current depth to groundwater is approximately 55 feet below ground surface. The location of the borings will be sighted according to the January 8, 1999 work plan and after consultation with the representative of SJC PHSIEHD. Soil samples will be collected for geological and analytical evaluation at 5-foot intervals. A boring log providing sediment description using the USCS and field observations will be ,,. maintained by a professional geologist working under the supervision of a registered geologist. Soil samples will be collected in 6.0-inch brass liners using a 2.0 inch modified California split spoon sampler. All soil samples will be sealed with Teflon, capped with Teflon end caps, labeled and placed in a cooler at 4° Celsius for transport to the laboratory following Chain of Custody protocol. Since only selected soil samples will be submitted for laboratory analysis, a screening 160 process will be used to gather additional information through field observation including: • sediment type, especially grain size and clay content • moisture content ,W,r • visible evidence of contamination, i.e., color change due to reduction of iron or discoloration from hydrocarbons and other pollutants • readings above background on a organic vapor meter(OVM) '-' The OVM is a portable photo ionization detector that uses a 10.0 eV lamp to detect compounds with ionization potential below 10.0 eV (hydrocarbon range). �. 2.2 Laboratory Analysis Soil samples collected during drilling and groundwater samples collected after well t. installation will be tested for BTEX, TPH-G and TEPH-D as proposed in the previous work plan. Samples will be sent to a licensed analytical laboratory. 2.3 Well Top Elevation Survey A licensed surveyor will survey the top of casing elevation on the existing wells as well as the new wells into a benchmark elevation. During review of previous groundwater ,r monitoring reports it appears that groundwater elevations in MW-3 maybe anomalous. A Proper top of casing elevation survey may resolve this and provide a clearer understanding of the groundwater gradient at the site.