Laserfiche WebLink
w <br /> 09 February 1996 <br /> AGE-NC Project No.95-0185 <br /> Page 2 of 5 <br /> hydrocarbon-impacted soil was limited to the capillary fringe or lower vadose zone. Locations of the <br /> probings are illustrated on Figure 2. <br /> 2.4. GROUND WATER DEPTH AND FLOW DIRECTION <br /> In December 1995, ground water depth at the site was approximately 19 feet below surface grade <br /> (bsg). Ground water flow direction at the site can vary seasonally. However, the overall regional <br /> flow direction is northeast. <br /> 3.0. SCOPE OF WORK <br /> 3.1. DRILLING AND SAMPLING <br /> The proposed work includes the installation of four ground water monitoring wells and the collection <br /> of ground water samples. Three monitoring wells will be installed on the property; a fourth well is <br /> proposed north of the former diesel UST excavation, along the northeast side of Highway 99 <br /> Frontage Road. Proposed monitoring well locations are illustrated in Figure 2. <br /> A 4-inch diameter well is proposed fro the vicinity of the former UST excavation to expedite removal <br /> of free product. All other proposed wells will be 2-inch diameter. Typical well design specifications <br /> are illustrated in Figure 3 -Monitoring Well Design. <br /> Each boring will be advanced utilizing a truck mounted, hollow stem drill rig and 8.25-inch hollow- <br /> stem augers. Soil samples will be collected at five-foot intervals beginning at 5 feet bsg in each boring. <br /> Samples will be collected using a California split-spoon sampler and brass sleeves. Samples will be <br /> driven by dropping a 140-pound weight from a height of 30 inches. The number of blows required <br /> to drive each 6-inch length of the sampler(blow counts) will be recorded on boring logs by an AGE <br /> staff geologist. <br /> Upon sample retrieval, the middle brass sleeve will be removed from the sampler. The ends of the <br /> sleeve will be immediately covered with Teflon tape or aluminum sheets, sealed with plastic end caps, <br /> secured with tape and immediately placed under ice in a chilled container for transportation to a <br /> State-certified laboratory. Each soil sample sleeve will be labeled with the following: boring location, <br /> vertical depth, time, date and sampler's initials. <br /> 3.2. EQUIPMENT DECONTAMINATION <br /> All sampling tools and brass sleeves used for sample collection will be thoroughly rinsed with clean <br />