Laserfiche WebLink
07 March 2014 <br /> AGE Project No . 99-0682 <br /> Page 4 of 5 <br /> 3 . 1 . SOIL PROBE BORING ADVANCEMENT <br /> Proposed soil borings will be advanced using a truck mounted AMS Powerprobe 9600 <br /> direct-push probing unit equipped with 1 . 25-inch probing rods . The Powerprobe or other <br /> probe advances soil probe borings using a hydraulic hammer to drive soil and <br /> groundwater sampling tools to specified depths . <br /> 3 . 2 . GRAB GROUNDWATER SAMPLING <br /> Grab groundwater samples will be collected from each boring to assess and define the <br /> down-gradient lateral extent of petroleum hydrocarbon-impacted . Once groundwater <br /> has been encountered , a Geoprobe (or similar) push-driven water sampling device will <br /> be advanced four feet into the water-bearing zone . <br /> For collection of grab groundwater samples , soil borings will be advanced to <br /> approximately 70 feet bsg ; and if necessary , alternate soil borings will be advanced to <br /> approximately 70 feet bsg for collection of grab groundwater samples . <br /> Grab groundwater samples will be collected using a Geoprobe water sampling <br /> assembly fitted with a pre-cleaned , one-inch diameter 0 . 01 -slotted temporary well <br /> screen . Each groundwater sample will be extracted by inserting dedicated disposable <br /> polyethylene tubing equipped with a check valve through the hollow center of the push <br /> rods into the screen section . Samples will be analyzed for the constituents listed in <br /> Section 2 . 3 . and will be collected into laboratory-supplied , non-preserved 40-ml Volatile <br /> Organic Analysis (VOA) vials and one-liter amber glass containers . <br /> Appropriately sealed and labeled samples will be placed in a chilled container under ice <br /> and transported under chain-of-custody procedure to a CDPH-certified laboratory . Each <br /> sample container will be labeled with sample designation , time , date and sampler's <br /> initials . <br /> 3 . 3 . EQUIPMENT DECONTAMINATION/WASTE MANAGEMENT <br /> Prior to use , all sampling tools used for sample collection will be thoroughly rinsed with <br /> clean water after being washed with a solution of Alconox . All probing rods will be <br /> cleaned prior to advancement at each probe boring location . Any soil or water waste <br /> generated during field activities will be containerized in properly labeled DOT-approved <br /> 55-gallon drums , and stored on-site in an area generally lacking public access . Disposal <br /> alternatives will be evaluated based on results of soil and water analysis . <br /> Advanced GeoEnvirnnmental Inc . <br />