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• ,lar will be warmed for approximately 20 minutes (in the sun), then the foil will be pierced and the head-space within the Jar will be tested for total organic vapor, measured in parts per million as benzene (ppm, volume/volume) The instrument will be calibrated prior to drilling using a 100-ppm isobutylene standard (in air) and a sensitivity factor of 55 which relates the photo-ionization potential of benzene to that of rsobutylene at 100 ppm The results of the field testing will be noted on the boring logs PID readings are useful for indicating relative levels of contamination, but cannot be used to evaluate hydrocarbon levels with the confi- dence of laboratory analyses Groundwater Monitoring Well Sampling Procedures The sampling procedure for each well consists first of measuring the water level and checking for the presence of separate-phase hydrocarbons (SPH), using either an electronic indicator and a clear Teflon® bailer or an oil-water interface probe Wells not containing i SPH are then purged of approximately four casing volumes of water (or to dryness) using a centrifugal pump, gas displacement pump, or bailer Equipment used for the current sampling event is noted on the attached field data sheets During purging, temperature, pH, and electrical conductivity are monitored in order to document that these parameters are stable prior to collecting samples After purging, water levels are allowed to partially recover Groundwater samples are collected using a Teflon bailer, placed into appropriate EPA-approved containers, labeled, logged onto chain-of-custody documents, and transported on ice to a California State-certified laboratory Laboratory Procedures Selected soil samples collected from the soil borings and groundwater collected from the groundwater monitoring wells will be analyzed for the presence of total petroleum hydrocarbons calculated as gasoline (TPH-g), benzene, toluene, ethylbenzene, and xylenes (BTEX compounds), and methyl tertiary butyl ether (MtBE) by modified EPA Method 8015 and EPA Method 8020 Soil Cuttings and Rinsate Water Soil cuttings generated during drilling operations will be temporarily stored on and covered with plastic sheeting pending characterization and disposal Rinsate water generated during steam cleaning will be temporarily stored in DOT-approved 55-gallon drums pending transport Soil cuttings and ansate water will be removed by a certified disposal hauler to an appropriate disposal facility • 9310021A\WPLAN A - 2 August 27, 1997