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' C�eafvBuaC7ecknus Znc Page 2 Soil&Groundwater Investigation Report Ted Peters-UST Project No 640 2 November 3, 1999 ' • Soil borings for MW-1, MW-2 and MW-3 were drilled to a depth of 20 feet bgs with an 8-inch outside diameter (o d ), continuous flight, hollow stem auger owned and operated by V&W Drilling (C57# 720904) Soil samples were collected as described in Section ' 2 1 1 These borings were converted into 2-inch diameter monitoring wells • SB-1 & SB-2 were drilled using an 8-inch outside diameter (o d), continuous flight, hollow stem auger owned and operated by V&W Drilling (C57# 720904) The borings were drilled to a depth of 20 and 25 feet bgs Soil samples were collected as described in Section 2 1 1 Hydropunch groundwater samples were collected from these borings Contaminated soil cuttings and drilling decontamination water were placed in DOT-17 55- gallon drums and placed alongside the building until disposal can be arranged Clean soil cuttings were placed on plastic ' 2.1.1 Soil Sampling Procedure Soil samples were collected for geological and analytical evaluation at five-foot intervals A professional geologist working under the supervision of a registered geologist maintained a ' boring log providing sediment description using the USCS and field observations Soil samples were collected in 6 0-inch brass liners using a 2 0 inch modified California split spoon sampler All soil samples were sealed with Teflon sheets, capped with plastic end caps, labeled, and placed in a cooler at 4° Celsius for transport to the laboratory following 1 Chain of Custody protocol Since only selected soil samples collected were submitted for laboratory analysis, a screening process was used to gather additional information through field observation noting the following ■ sediment type, especially grain size and clay content ' ■ moisture content ■ 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) tThe 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) ' Details on the geology encountered during the completion of the sampling event as well as the field observations are included in Section 3 2, Geology and Field Observations ' 2.1.2 Hydropunch Groundwater Sample Collection A hydropunch type groundwater-sampling tool was used in SB-1 and SB-2 to collect groundwater samples The tool was advanced approximately four feet beyond the end of the ' augers, to 24' bgs, and then retracted approximately two feet to expose the screen A narrow Teflon bailer was used to recover representative groundwater samples Care was taken to minimize sample agitation from the initial filling of the bailer to the transfer of the sample to ' the sample containers Once the sample container was filled and capped, the bottle was inverted, tapped, and checked for headspace bubbles The sample container was identified and labeled with a unique designation, inserted into foam holders and placed in an ice chest cooled to 4°C for transport to the laboratory