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� a monitoring well will be completed with neat cement from the bentonite seal to ground surface The well casing will be topped with a locking cap The well head will be contained in a watertight well box, 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 The development procedure for each well will consist of pumping or bailing water from the well until the water is visibly clear, the well goes dry, or until a maximum of ten casing volumes have been removed The newly installed wells will be surveyed by a California State Licensed Surveyor The well casings will be surveyed to the nearest 0 0l feet in elevation to a known benchmark 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 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 ret,, __�s 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 water samples collected will be analyzed for the presence of total petroleum hydrocarbons calculated as gasoline, benzene, toluene, ethylbenzene, and xylenes, and methyl tertiary butyl ether (MtBE) using modified EPA Methods 8015 and 8020 Fuel oxygenates will be analyzed for by EPA Method 8260 Soil Cuttings and Rinsate Water Soil cuttings generated during drilling operations will be temporarily stored onsite and covered with plastic sheeting pending characterization and disposal Soil cuttings will be removed by ARCO's disposal contractor to an appropriate disposal facility Water generated during steam cleaning will be temporarily stored in DOT-approved 55-gallon drums pending transport by ARCO's disposal contractor to an appropriate disposal or treatment facility Soil cuttings and purge water drums will be temporarily stored onsite for approximately 4 to 8 weeks 077 4041 3101WKPLAN February 28,2000