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I � r ATTACHMENT C FIELD AND LABORATORY PROCEDURES Chevron 9-6258, 2409 East Main Street at F Street, Stockton, CA by chain-of-custody documentation. The well casing will be surveyed to the nearest 0.01 feet in elevation to a known benchmark. Organic Vapor Procedures Soil samples collected during drilling will be analyzed in the field for ionizable organic compounds using an organic vapor meter (OVM) or a 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 ziplock type bag or in a clean glass jar, and sealing the jar with aluminum foil secured under a ring-type threaded lid. The container will be warmed for approximately 20 minutes (in the sun), then the head-space within the container 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 OVM 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 collected will be analyzed for the presence of TPHg EPA Method 8015, and BTEX, and fuel oxygenates (MtBE, EtBE, TBA, TAME, DIPE, methanol, and ethanol) using EPA Method 826013. Soil Cuttings and Purge Water Soil cuttings generated during drilling operations will be temporarily stored on plastic or in DOT-approved 55-gallon drums pending transport by the disposal contractor to an appropriate disposal or treatment facility. A California=certified disposal contractor will remove contaminated soil cuttings to an appropriate disposal facility. - Water generated during steam cleaning and development of the new wells will be temporarily stored in DOT- approved 55-gallon drums pending transport by the disposal contractor to an appropriate disposal or treatment facility.