ARCHIVED REPORTS XR0001427 - Laserfiche WebLink

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cement seal will extend from the bentonite transition seal to the ground surface The Portland cement seal will be emplaced by tremie pipe or through the center of the hollow-stem augers in one continuous operation from the bottom of the interval to be filled to the top Emplacement of the Portland cement grout specifically shall not be accomplished by "free fall" from the ground surface The boring logs will show well construction details The groundwater monitoring wells will be developed after completion The development proce- dure for each well will consist of pumping or balling 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 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 ziplock type bag or in a clean glass jar, and sealing the far 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 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 samples taken from the monitoring well locations will be analyzed for the presence of total petroleum hydrocarbons as diesel (TPH-d), total petroleum hydrocarbons as gasoline (TPH-g), and benzene, toluene, ethylbenzene, xylenes (BTEX), by EPA Methods 8015 Modified, and 8020 MtBE will be analyzed by EPA Method 8260 and Total Lead by EPA Method 6010 Selected samples taken from Boring B-4 will be analyzed for the above listed analytes plus cis-1,2-Dichloroethene (cis-1,2-DCE), trans-1,2-Dichlorethene (trans-1,2-DCE), Tetrachlorethene (PCE), and Trichlorethene (TCE) by EPA Method 8010 One sample from the location of Boring B-4 will be analyzed for Tier One RBCA physical parameters Groundwater samples collected from the monitoring wells and the sample collected from Boring B-4 will be submitted to a California State-certified laboratory for analysis Groundwater samples will be analyzed for the presence of TPH-d, TPH-g, and BTEX by 910-017 IA/WPLAN A - 2 July 15, 1999