Laserfiche WebLink
22 September 2009 <br /> AGE-NC Project No. 09-1692 <br /> Page 8 of 11 <br /> of the ground water table as identified by collection of a saturated soil sample. Once ground water <br /> has been encountered, a Geoprobe push-driven water sampling device will be advanced four feet <br /> into the water-bearing zone. A grab ground water sample will be collected using a Geoprobe water <br /> sampling assembly fitted with a pre-cleaned,one-inch diameter 0.01-slotted temporary well screen. <br /> The ground water sample will be extracted by either lowering a polyethylene bailer through the <br /> hollow center of the push rods into the screen section, or using inertial action by lowering Teflon <br /> tubing through the hollow center of the push rods into the screen section. <br /> Appropriately sealed and labeled samples will be placed in a chilled container under ice and <br /> transported under chain-of-custodyprocedure to a CDPH-certified laboratory.Each sample container <br /> will be labeled with the boring designation, time, date and sampler's initials. <br /> 4.4. EQUIPMENT DECONTAMINATION <br /> Prior to use,all sampling tools used for sample collection will be thoroughly rinsed with clean water <br /> after being washed with a solution of Alconox. All probing rods will be cleaned prior to <br /> advancement at each probe boring location. <br /> 4.5. BORING ABANDONMENT <br /> The probe boring will be permanently sealed to prevent vertical migration of potential contaminants. <br /> The soil probe boring shall be abandoned by backfilling with portland cement from the total depth <br /> to surface grade. <br /> 5.0. MONITORING WELL INSTALLATION FIELD PROCEDURES <br /> All field procedures will be overseen by an AGE representative under the supervision of a California <br /> Professional Geologist. Procedures for soil and ground water sampling, well installation, well <br /> development and survey, are described below. <br /> 5.1. PILOT BORING ADVANCEMENT <br /> Four pilot borings will be advanced to a depth of approximately 30 feet bsg, utilizing a truck- <br /> mounted, hollow-stem drill rig and 8.25-inch diameter hollow-stem augers. Cuttings and rinseate <br /> generated during drilling activities will be containerized in properly labeled Department of <br /> Transportation(DOT)-approved 55-gallon drums,and stored on-site in an area lacking public access. <br /> Advanced GeoEnvironmental,Inc. <br />