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++ APPENDIX A (continued) FIELD AND LABORATORY PROCEDURES Organic Vapor Procedures Soil samples collected at 5-foot depth intervals during drilling will be analyzed in the field for ionizable organic compounds using a flame-ionization detector (FID) 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 zip lock 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 photoionization 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 Groundwater samples will be sent under chain-of-custody procedures to a California State- certified laboratory for analysis of total petroleum hydrocarbons quantified as gasoline (TPHg), total petroleum hydrocarbons quantified as diesel (TPHd), total petroleum hydrocarbons quantified as motor oil (TPHmo), and methanol by EPA Method 8015; and benzene, toluene, ethylbenzene, xylenes (BTEX), methyl tertiary butyl ether (MtBE), tertiary butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (EtBE), tertiary amyl methyl ether (TAME), ethylene dibromide (EDB), and 1,2-dichloroethane (1,2-DCA), and ethanol by EPA Method 8260. Soil Cuttings and Purge Water Soil cuttings generated during drilling operations will be temporarily stored on site and covered with plastic sheeting pending characterization and disposal. Contaminated soil cuttings will be removed by a California-certified disposal contractor 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. l:\Chevron\90557\REPORTS\Feasibility Study\03_Addendum.doc