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C�eoCo�uaC'Technws Inc • Page 2 Geo Corp-WP Addendum#2 Project 507 2 July 8, 1998 • 2.3 Additional Deep Soil Boring In an effort to define the vertical extent of gasoline range petroleum hydrocarbons beneath the site, we propose to advance one deep soil boring The boring will be drilled using an 8 25-inch outside diameter continuous flight hollow stem auger owned and operated by V&W Drilling (C574 720904) It is proposed to drill the borehole to a depth past the last contamination detected by field methods The borehole will be located adjacent to the former UST pit 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 2.3.1 Soil Sampling Procedure i Soil samples will be collected for geological and analytical evaluation at five-foot intervals Soil and pore water samples will be collected from four intervals with a SrmulProbe sampling tool The first interval will be approximately 5 feet below the current water table The procedure for SrmulProbe use is presented below A professional geologist working under the supervision of a registered geologist will maintain a boring log providing sediment description using the U S C S and field � . observations 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 foil, capped with end caps, labeled and placed in a cooler at 4° Celsius for transport to the laboratory following Chairs of Custody protocol Because every soil sample collected will not be submitted for laboratory analysis, a screening process will be used to gather additional information The screening will include a Field observation noting sediment type, especially grain size and clay content ® Moisture content 6 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) 2.3.2 - Soil and Soil Pore Water Sample Collection with the SrmulProbe ' To provide data as to the vertical extent of contaminants in the aquifer and the mass of chemical sorbed to the soil grains below the water table, GTI proposes to collect SrmulProbe ' samples at four intervals in SB-101 The exact depth interval from which these samples will be collected will be determined in the field The goal is to collect representative samples from both the fine grained and coarse grained units encountered ' The SrmulProbe allows a soil sample to be collected at the exact interval from which the water or soil gas sample is collected thus providing correlative information on the sorbed I