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S E C O R ATTACHMENT A FIELD AND LABORATORY PROCEDURES EXPLORATORY DRILLING Soil borings will be drilled to maximum depth of 50 feet bgs using direct push drilling equipment. The borings will be logged by a geologist using the Unified Soil Classification System and standard geologic techniques. Soil samples for logging from the borings will be collected continuously. All soil samples 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 documentation. All down-hole drilling and sampling equipment will be steam-cleaned following the completion of the soil boring. Down-hole sampling equipment will be washed in an alconox solution between samples. ORGANIC VAPOR PROCEDURES Soil samples collected during drilling and redevelopment will be analyzed in the field for ionizable organic compounds using a photo-ionization detector (PID) with a 10.2 eV lamp or a flame ionization detector (FID). The test procedure will involve measuring approximately 30 grams from an undisturbed soil sample, placing this subsample in a sealed container (either a zip-lock bag or a mason jar). 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. The results of the field-testing will be noted on the boring logs. 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 analyses. LABORATORY PROCEDURES Selected soil and groundwater samples will be analyzed for TPHg, BTEX, and fuel oxygenates by EPA Method 8260. SOIL CUTTINGS AND RINSATE/PURGE WATER Soil cuttings generated during drilling operations will be temporarily stored on-site in a secure location pending characterization and disposal. Soil cuttings will be removed by an approved disposal contractor to an appropriate disposal facility. Water generated during equipment cleaning and sampling will be temporarily stored in DOT-approved 55-gallon drums pending transport by an approved disposal contractor to an appropriate disposal or treatment facility. Drummed soil cuttings and rinsate water will be temporarily stored on-site for approximately 4 to 6 weeks.