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7 N Iia S E C ® R Attachment 2 • Field Procedures � I Organic Vapor Monitoring Procedures Soil samples collected at 5-foot depth intervals during drilling activities and hand augering will be analyzed in the field for ionizable organic compounds using a photo-ionization detector (PID) with a 10 2 ultra-violet (UV) lamp The test procedure will involve measuring approximately 30 grams from an undisturbed soil sample, placing this sub-sample in a sealed container (either a zip-lock bag or a { mason lar) The container will be warmed for approximately 20 minutes (in the sun), then the head- space within 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 isobutylene at 100 ppm PID and FID readings are useful for indicating relative levels of contamination, but cannot be used to evaluate hydrocarbon levels with the confidence of laboratory r y analyses Laboratory Procedures for Soil and Ground water Samples 7 Selected soil and water samples collected will be analyzed for total petroleum hydrocarbons as gasoline (TPHg) and total petroleum hydrocarbons as diesel (TPHd), by EPA Method 8015, benzene, toluene, ethyl-benzene, xylenes (BTEX), and fuel oxygenates methyl tertiary butyl ether (MtBE), ethyl tertiary butyl ether (EtBE), tert-butanol (TBA), tertiary amyl methyl ether (TAME), di- isopropyl ether (DIPE), ethanol and, methanol, by EPA Method 826013, and total lead by EPA Method 7420 Soil Borings and Sampling The borings will be, logged by a SECOR representative using the Unified Soil Classification System and standard geologic techniques Soil samples for logging will be, collected at five-foot intervals using a California-modified split-spoon sampler or continuously sampled using a 5-foot core barrel The soil borings will be drilled using an 8-inch hollow-stem auger drilling equipment to a depth of approximately 40 feet bgs The sampler will be driven ahead of the augers approximately of w` 18 inches using a split spoon sampler or a slide sampler Soil samples collected for chemical analysis will be retained in brass liners, capped with Teflon squares and plastic end caps, and sealed in clean zip-lock bags The samples will be placed on ice for transport to the laboratory accompanied by chain-of-custody record Down-hole drilling and sampling equipment will be steam- cleaned prior to and following completion of each sample interval Groundwater Monitoring Well Installation and Sampling The borings will be converted to groundwater monitoring wells by installing 2-inch diameter, flush- threaded, Schedule 40 PVC casing with 0 020-inch factory-slotted screen Approximately 10 feet of screen will be placed in the bottom of each boring Number 2 sand will be placed in the annular space across the entire screened interval, and will extend approximately 2 feet above the top of the screen for each well A bentonite seal will extend two feet above the sand pack The monitoring wells will be completed with neat cement from the bentonite seal to ground surface The well casings will be topped with a locking cap The wellheads will be contained in watertight well boxes, l either traffic rated and flush mounted or in a "stove-pipe" arrangement The boring logs will show well construction details The wells will be developed after completion by pumping or bailing water i