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stored on site. The disposal of the effluent will be the responsibility of the ' client. Drill cuttings generated during the drilling procedure will be stockpiled on ' site. Stockpiled drill cuttings will be placed on and covered with plastic sheeting. The stockpiled soil is typically characterized by collecting and analyzing composite samples from the stockpile. EMCON Associates will ' recommend an appropriate method for disposition of the cuttings based on the analytical results. The client will be responsible for disposal of the drill cuttings. Soil samples for chemical analysis will be collected in brass or stainless steel liners, sealed with Teflon@ tape and plastic end caps, labeled, placed on ice, and delivered to a state-certified analytical laboratory, along with the appropriate chain-of-custody documentation. Soil samples selected for ' chemical analysis will be determined from a head-space analysis using a hand-held photoionization detector (PID). The soil will be placed in a glass jar, sealed, and placed in a warm atmosphere. After approximately 15 min- utes, which is generally sufficient for volatiles to escape from the soil, the PID probe will be inserted into the glass jar. The total volatile hydrocar- bons present are detected by the PID and reported in parts per million. The PID will be calibrated to an isobutylene standard. Generally two soil samples from each soil boring will be submitted for ' chemical analysis. Soil samples selected for analysis typically represent the highest PID reading recorded for each soil boring and the sample just ' above first-encountered ground water. Monitoring Well Installation Monitoring wells will be completed by installing 2- to 6-inch-diameter schedule 40 polyvinyl chloride (PVC) casing. The 2-inch-diameter flush- threaded casing is generally used for wells dedicated for ground-water monitoring purposes. Larger diameter casings will be used for monitoring wells which will potentially be used for hydraulic testing and ground-water extraction. The screened sections of casing are factory machine slotted and will be installed approximately 5 feet above and 10 feet below first-en- countered water level. The screened interval will allow for seasonal fluctu- ation in water level and for monitoring floating product. A filter pack of graded sand will be placed in the annular space between the PVC casing and the borehole wall. Sand will be added to the borehole through the p#1f921f920201 a B - 2 Rev. 0 June 1, 1992