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Organic Vapor Procedures Soil samples collected at 5-foot depth intervals during drilling will be analyzed in the field for ionizable organic compounds using the HNU Model PI-101 (or equivalent) photo-ionization detector(PID) with a 10 2 eV lamp The test procedure will involve measuring approximately 30 grams from an undisturbed soil sample, placing this subsample in a clean glass jar, and sealing the jar with aluminum foil secured under a ring-type threaded lid The jar will be warmed for approximately 20 minutes (in the sun), the foil pierced, and the head-space within the jar tested for total organic vapor, measured in parts per nullion as benzene (ppm, volume/volume) The instrument will be calibrated prior to drilling using a i 00-ppm isobuty- lene standard (in air) and a sensitivity factor of 55 which relates the photo-ionization potential of benzene to that of isobutylene 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 confidence of laboratory analyses Well Development and Groundwater Sampling The groundwater monitoring wells will be developed and sampled a minimum of 24 hours after completion of the wells Well development procedure will include swabbing and bailing and/or pumping Water will be removed from the well until relatively turbid free water is . produced, or until a minimum of ten casing volumes have been removed The groundwater sampling procedure will consist of first measuring the water level in the well, and checking it for the presence of separate-phase hydrocarbons (SPH) using an MMC oil-water interface probe If SPH are not present, the well will be purged of a minimum of five casing volumes of water During purging, temperature, pH, and electrical conductivity will be monitored until stable to document that a representative sample is collected After the water level recovers, a sample will be collected from each well using a Teflon bailer and placed into appropriate EPA-approved containers The samples will be labeled, logged onto a chain-of-custody document, and transported on ice to the laboratory Rinsate, Purge, and Development Waters, and Soil Cuttings Storage and Disposal Waters produced during field activities will be transported via a purge trailer and disposed of at a state-certified treatment and disposal facility When necessary, waters will temporarily be stored on site in DOT-approved 55-gallon drums pending transport and disposal Soil cuttings generated during drilling will be placed on visqueen and covered with plastic Samples of the cuttings will be collected and sent to a state-certified laboratory for analysis Pending analytical results, the soil cuttings will be hauled by a state-certified waste hauler to a state-certified treatment and disposal facility 3201591A VKPLAN A- 2 November 8, 1995