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+1 „ ATTACHMENT B (continued) FIELD AND LABORATORY PROCEDURES will be topped with locking caps The wellheads were contained in watertight well boxes, either traffic rated and flush mounted or in a "stove-pipe" arrangement The boring logs show the well construction details The wells were developed after completion The development procedure for the wells consisted of pumping or bailing water from the wells until the water is visibly clear, the wells goes dry, or until a maximum of ten casing volumes have been removed After development, water levels were allowed to recover Groundwater samples were then collected using a disposable teflon bailer, placed into appropriate EPA- approved containers, labeled, placed on ice, and transported to the laboratory accompanied by chain-of-custody documentation The well casings were surveyed to the nearest 0 01 feet in elevation to a known benchmark Organic Vapor Procedures Soil samples collected during drilling were 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 far, and sealing the far with aluminum foil secured under a nng-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 dnIling using a 100-ppm Fsobutylene 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 collected were analyzed for the presence of total petroleum hydrocarbons calculated as gasoline (TPHg), benzene, toluene, ethylbenzene, xylenes (BTEX), and fuel oxygenates (MtBE, EtBE, TBA, TAME, DIPE, 1,2-DCA, EDB Methanol, and ethanol) using EPA Method 8260 Soil Cuttings and Purge Water Soil cuttings generated during drilling operations were temporarily stored on plastic or in DOT-approved 55-gallon drums pending transport by the disposal contractor to an appropriate disposal or treatment facility Contaminated soil cuttings were removed by a California-certified disposal contractor to an appropriate disposal facility Water generated during steam cleaning and development of the new wells were temporarily stored in DOT- approved 55-gallon drums pending transport by the disposal contractor to an appropriate disposal or treatment facility