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' CJeofp�Tecknzcs Inc • Page 3 <br /> Momtormg Well Installation Work Plan <br /> 111,1 Equipment Co <br /> Project No 507 2 <br /> November 6,2000 <br /> 2.1.1 Soil Sampling Procedure <br />' Soil samples will be collected for geological and analytical evaluation at five-foot intervals <br /> A boring log providing sediment description using the USCS and field observations will be <br /> maintained by a geologist working under the supervision of a registered geologist Soil <br /> samples will be collected in 6 0-inch brass liners using a 2 0-inch modified California split <br />' spoon sampler All soil samples will be sealed with Teflon, capped with Teflon end caps, <br /> labeled and placed in a cooler at 4° Celsius for transport to the laboratory following Chain of <br /> Custody protocol <br />' Since only selected soil sample collected will be submitted for laboratory analysis, a <br /> screening process will be used to gather additional information through field observation <br />' These observation include the following <br /> • Sediment type (especially grain size and clay content) <br /> • Sediment structure (layering, cross bedding, deformation structures, root tubes, etc ) <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 /> At least two soil samples from each boring shall be submitted for laboratory analyses <br /> 2.1.2 Soil Laboratory Analyses <br /> 1 Based on field screening observations, up to three soil samples from each borehole will be <br /> submitted to Sherwood Laboratories of Hilmar (State Certified Laboratory 41400) for <br /> analysis for benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 8020, <br /> gasoline range petroleum hydrocarbons (TPH-G) by EPA method 8015(m), Methyl Tertiary <br /> Butyl Ether (MTBE) by EPA method 8020 with confirmation by 8260 The detection limits <br /> for these compounds are listed below A Chain of Custody will be completed for all samples <br /> ' collected and tracked to ensure sample integrity <br /> Detection Limits BTEX MTBE TPH-0 <br /> So f µg g1,000 _J <br /> In addition to these chemical tests, soil samples will be selected from different soil types for <br /> ' testing of geophysical parameters, (including but not limited to moisture, grain size <br /> distribution, density, permeability and organic content), by ASTM methods D5084, D2434, <br /> D422 and D2974 <br /> t2.1.3 Monitoring Well Construction <br /> The monitoring well will be constructed using 2 0 inch diameter PVC casing with flush <br /> ' threads The screened interval for the water table wells will extend from five feet above the <br /> water table to ten feet below the water table Ground water is expected to be located <br /> approximately 13 feet below grade A #3 sand filter pack will surround and extend two feet <br />