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s s :N:?.'�2N.�;:GNnLT�CH1'OLCGx�OR?CRf;.:G\ 3.1 MONITORING WELL INSTALLATION AND SAMPLING PROCEDURES IT Corporation subcontracted the drilling services of Srectrum Exploration, Inc. (C57 177681). Drilling of the wells was accomplished on April 26 and 27, 1990 using a. CME 55 rig fitted with a steam cleaned, eleven-inch outer diameter, L00tinuous flight, hollow stem auger. Prior to the start of field activities, the IT Corporation field geologist conducted a TAILGATE SAFETY MEETING to insure that proper safety measures were followed and potential hazards were identified. The boreholes were logged by an IT Corporation field geologist, using the ; visual method of the Unified Soil Classification System (USCS) as described in USER 5005-06. Boring logs of each well and boring are contained in Appendix B. Each core recovered, as well as periodic drill cuttings were screened for the release of volatile organic contaminants with c Thermo Environmental Instruments Inc. Model 5800 organic vapor analyzer (OVA). This photoioniza- " L tion detector was equipped wit% d 10.2 ell lamp. The calibration of the OVA was confirmed each morning by the field geologist. Undisturbed Samples at five foot intervals were collected in three two-inch diameter by six-inch length, brass tubes enclosed within a eighteen-inch split spoon sampler. All sampling equipment was decontaminated before and between L each sampling event. The decontamination procedure for the brass tubes and „ e the split spoon sampler were as follows: scrubbing with a non-phosphate rinse, water rinse. methanol rinse, and a distilled water rinse. Samples with the highest organic vapor headspace readings (as screened with the OVA) or the deepest sample above groundwater, were submitted for chemical analysis. Each submitted sample was sealed with aluminum foil andplastic end caps. Samples were then individually placed in "zip-loc" bags, sealed with security tape and placed in a refrigerated cooler. Chain of custody forms accompanied samples at all times. .�" The samples were delivered, via courier, to International Technology --. --- -- - -.r ---Anal Service-(ITAS) -in-San Jose;-Californias-Sail-samples-collected-------=---- ---- --- ---- ---- :ENG:702f ...