ARCHIVED REPORTS XR0002735 - Laserfiche WebLink

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S E C 0 R ATTACHMENT 2 FIELD AND LABORATORY PROCEDURES i P Exploratory Drilling The sod borings for the OS and groundwater monitoring wells will be drilled using 8-inch hollow-stem A. auger drilling equipment Each boring will be logged by a SECOR geologist using the Unified Sod f ' Classification System and standard geologic techniques Soil samples for logging and possible ,( laboratory analysis will be collected at 5-foot depth intervals using a California-modified split-spoon sampler The sampler will be driven a maximum of 18 inches using a 140-pound hammer with a 30-inch drop All soil samples selected for chemical analysis will be retained in brass liners, capped with TeflonO squares and plastic end caps, and sealed in ZiplockTm-style 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 prior to and following the completion of the soil borings Down-hole sampling equipment will be washed to a trisodium phosphate or alconox solution between samplesA Organic Vapor Procedures ,r Soil samples will be collected at 5-foot depth intervals for analysis in the field for ionizable organic compounds using a flame-ionization detector (FID)or a PID with a 10 2 eV lamp The test procedure involves measuring approximately 30 grams from an undisturbed soil sample, placing this subsample in a ZiplockTM-type bag or in a clean glass far, and sealing the tar 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 The results of the field-testing wilt be noted on the boring logs FOOD readings are useful for indicating relative levels of contamination, but cannot be used to evaluate petroleum hydrocarbon levels with a ; the confidence of laboratory analyses a � Ozone Sparge Well/Monitoring Well Installation and Development Each OS well will be completed within a sod boring by installing a 1 25-inch diameter, flush-threaded, "= Schedule 80 PVC casing equipped with a 3-foot long ozone sparging diffuser tip Each groundwater °J monitoring well will be completed within a soil boring by installing a 2-inch diameter, flush-threaded, x Schedule 40 PVC casing with approximately 20 feet of 0 020-inch factory-slotted screen An RMC 2112 sand pack, or equivalent, will be placed in the annular space across the entire screened interval, extending at least 2 feet above the top of the screen A 2-foot bentonite transition seal will be placed atop the sand pack, followed by a cement seal, extending from the top of the bentonite transition seal to the ground surface The boring logs will show well construction details The groundwater monitoring wells will be developed by SECOR after completion The development procedure for the well consists of pumping and/or bailing water from the well until the purge water is visibly clear, the wells go dry, or until a maximum of ten casing volumes have been removed The well development sheets will be included in the future report submittal , Groundwater Sampling Procedures The sampling procedure for each well will include measuring the water level, and checking for the presence of separate-phase hydrocarbons (SPH), using either an electronic indicator and a clear