Laserfiche WebLink
28 August 2000 <br /> AGE-NC Project No. 97-0249 <br /> Page 7of10 <br /> will be pushed into the specified zone, then withdrawn approximately three feet to expose an inlet <br /> screen. The interior of the sampling tool fills with water and a 1-inch outer diameter(O.D.) stainless <br /> steel bailer will be lowered and utilized to extract a ground water sample.Grab ground water samples <br /> will be collected in intervals of porous and permeable material.All rinseate generated during drilling <br /> activities will be containerized in properly labeled DOT-approved 55-gallon drums, and was stored <br /> on-site in an area lacking public access. All soil borings were backfilled over their entire depth with <br /> a portland cement grout mix. <br /> Following sample collection, the samples will be placed in laboratory-supplied containers and <br /> transported under chain-of-custody to a DHS-certified laboratory <br /> Proposed soil boring locations are illustrated on Figure 2.Following borehole advancement,portland <br /> cement(grout mix)will be utilized to backfill each borehole utilizing a tremie pipe. The PHS-EHD <br /> will be given the opportunity to inspect the grout mix prior to backfilling activities. <br /> 4.2. MONITORING WELL DRILLING <br /> Soil borings will be advanced utilizing a truck-mounted, hollow-stem drill rig and 8-inch diameter <br /> hollow-stem augers. Cuttings generated during drilling activities will be placed on plastic sheeting <br /> and covered. Rinseate will be containerized in properly labeled D.O.T. approved 55-gallon drums, <br /> and stored on-site in an area lacking public access. Disposal alternatives will be evaluated based on <br /> results of soil and water analysis. <br /> 4.3. SOIL SAMPLING <br /> Soil samples will be collected at five-foot intervals,beginning at a depth of 5 feet bsg, utilizing a <br /> modified California split-spoon sampler and brass sleeves. The sampler will be driven by dropping <br /> a 140-pound weight from a height of 30 inches (blow counts). The blow counts will be recorded on <br /> boring logs. Upon soil sample retrieval,the middle brass sleeve will be removed from the sampler. <br /> The ends of the brass sleeve will be immediately covered with Teflon or aluminum sheets, sealed <br /> with plastic end caps, secured with tape and immediately placed in a chilled container for <br /> transportation under chain of custody to a state-certified laboratory. Each sample sleeve will be <br /> labeled with the boring location, sample depth, sample time, sampling date and sampler's initials. <br /> During sampling activities, sample duplicates will be monitored for the presence of organic vapor <br /> using a photo-ionization detector (PID: Thermo Environmental 580A, 10.0 eV, calibrated to <br /> isobutylene) and will be visually described on boring logs using the Unified Soil Classification <br /> System(USCS). <br /> Advanced GmEnvironmental,Inc. <br />