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16 locating and marking underground utilities at the site Underground Service Alert (USA) was ' notified 48 hours before the drilling start date for clearing and locating public utilities off site ' 32 Soilr Bo in s ' On December 20 through December 27, 1994, SECOR supervised the drilling of five soil borings and the construction of four groundwater monitor wells at the site The approximate ' location of these groundwater monitoring wells and other selected site features are shown on Figure 2 The soil borings were advanced to a depth of approximately 100 feet bgs using a ' CME-55 drill rig equipped with 8 5--inch outside diameter hollow--stem augers operated by Geo- Environmental Drilling Corporation of Yuba City, California An attempt was made to construct ' a fifth well within SB-I I however, the drilling contractor was unable to continue due to auger refusal at approximately 78 feet bgs The drilling was supervised by a field geologist working under the direction of a State of California registered geologist A continuous log of materials encountered while drilling was completed by the field geologist and described in accordance with the Unified Soil Classification System (Appendix A) ' 33 Soil Sampling ' Soil samples were collected during drilling using a modified split-spoon sampler containing three, 2-inch diameter by 6-inch long brass sample tubes The tubes were field screened for ' volatile organic compounds using a photoionization detector (PID) calibrated to an isobutlyene standard Soil samples collected were sealed with aluminum foil, plastic caps and tape The soil ' samples were labeled with the appropriate borehole information, time and date of collection, and placed on ice for subsequent transport to and analysis at a State of California certified analytical ' laboratory Chain-of-custody procedures were followed at all times Nuons oni M '1](kl RPi \tri >>