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CLOSURE REQUEST 5-31-94 DRILLING RIG, HOLLOW STEM AUGER WITH CA. SPLIT SPOON SAMPLER. A truck-mounted drilling rig with eight inch and ten inch hollow stem augers was used to drill and sample the borings. The rig equipment and augers was steam cleaned prior to use, and the sampling equipment was cleaned in the same fashion between each sampling interval . In addition, all lubricated parts that enter or approach the borings were lubricated with olive or Mazola oil . To document the soil samples taken at each interval during the drilling activities, a WEGE field geologist prepared a boring log, see Appendix F. The samples were described and categorized using lithologic descriptions and the Unified Soils Classification System. Relatively undisturbed soil samples were collected at five-foot intervals, at changes of lithology, and at the soil water interface, using a California Split Spoon Sampler equipped with four 21IX611 clean brass sleeves Borings were advanced to the desired depth with the hollow stem auger, and then the center rod center plug pilot bit assembly was withdrawn. The sampler was then lowered through the auger to the bottom of the borehole and driven 18" into the soil with a 140-pound hammer Prior to preservation, soil samples from each interval were field-checked for the presence of odor, vapor, and visible staining. In addition, a vapor analysis was performed on each sample using a hand-held photo ionizing detector (PID) which was calibrated daily with a SO ppm gasoline vapor standard. At each sample interval, the brass sleeve containing the soil sample with the highest PID reading is immediately preserved and labeled SAMPLE PRESERVATION Once the sleeve was filled, with no head space, the sampler was retrieved, the exposed soil at each end of the sleeve was then field screened, with an HNu PID using a 10 . 2 ev bulb, prior to sealing the ends with aluminum foil or a teflon liner. The tubes were then sealed with aluminum foil or teflon liners and capped with plastic end caps which were sealed with duct tape . The sample sleeve was then labeled with site ID#, sample ID#, date and time sampled and analysis to be run, prior to being placed in a zip lock baggie and placed on ice, in an ice chest b) Groundwater monitoring well design, installation, development. Monitor well design The initial monitor wells MW1, MW2 and MW3 were installed into 10 inch hollow stem augered borings and MW4 was installed into an eight inch hollow stem augered boring. The casing consisted of . F480 Sch 40 PVC, machine threaded four inch for MW1, MW2 and MW3 and two inch for MW4 . Screens consisted of 0 . 01 inch slot from page9