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Qeologmit 7-9cknics Inc. Page 6 <br /> Additional Site Characterization Work Plan <br /> Project No 724 2 <br /> . June 27,2002 <br /> observations will be maintained by a professional geologist working under the supervision <br /> of a registered geologist <br /> Soil samples will be collected in 6 0-inch brass liners using a 2 0-inch modified California <br /> split spoon sampler All soil samples for laboratory analysis will be sealed with Teflon, <br />' capped with Teflon end caps, labeled and placed in a cooler at 4° Celsius for transport to the <br /> laboratory following Chain of Custody protocol <br /> ' Since only selected soil samples collected will be submitted for laboratory analysis, a <br /> screening process will be used to gather additional information through field observation <br /> These observations will include <br /> • 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 an 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 /> 2.4.2 Soil Sampling Analyses <br /> Based on field screening observations up to five soil samples from MW-301 and three <br /> samples per off site well set will be submitted to Sherwood Labs of Hilmar, California <br /> (Department of Health Services Certification No 1400) for the following analyses <br /> o Benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 8020 <br /> ' • Gasoline range petroleum hydrocarbons (TPH-Gas) by-EPA method 5030/8015(m) <br /> • Methyl Tertiary Butyl Ether(MTBE) by EPA method $ 20 0 �, �� ► irt� �•. X7(,0 <br /> The detection limits for these compounds are listed below A Chain of Custody will be SvcJ[ay <br /> completed for all samples collected and tracked to ensure sample integrity <br /> ' BTEX MTBE TPH-G <br /> Detection Limits 8020 8260 8015m <br /> ' Soil (pg/Kg) 30 5 1,000 <br /> ' 2.4.3 Monitoring Well Construction <br /> The monitoring wells will be constructed using 2 0 inch diameter PVC casing with flush <br /> threads The filter pack will be surged during filter pack placement for the <br /> shallow/intermediate wells This will not be done on the deep wells to preclude sloughing <br /> in the boieholes A 2-4 foot retarded hydration weighted bentonite pellet transition seal will <br /> be installed and allowed to hydrate approximately one half-hour A surface seal will be <br />