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O1 February 2001 AGE-NC Project No. 00-0791 Page 3 of 4 3.3. GRAB GROUND WATER SAMPLE COLLECTION AND ANALYSIS Grab ground water samples may be collected during the boring process using a Geoprobe water sampling assembly. Samples will be collected into 40-m1 volatile organic analysis(VOA)vials and into 1-liter amber bottles as appropriate for the required analyses. Ground water sample collection procedures are presented in Section 4.3.Ground water samples will be analyzed by a DHS-certified laboratory for: • TPH-g and TPH-d by EPA Method 8015M/3550; and • BTEX and MTBE by EPA Method 8020. Laboratory reports for ground water analyses,testing methods,laboratory quality assurance/quality control(QA/QC)reports, and sample chain of custody documentation will be presented in a report with the findings and recommendations. 3.4. REPORT PREPARATION Upon completion of field work and receipt of final laboratory analysis, a report will be prepared presenting the findings of the investigation. The report will include a description of the work performed and results ofthe sampling and analysis.Conclusions,applicable recommendations,maps and cross-sections will be included in the report. The report will be in a format acceptable to PHS- EHD and the CVRWQCB, and will be reviewed and signed by a California Registered Geologist. 4.0. FIELD PROCEDURES All field procedures will be overseen by an AGE representative under the supervision of a California Registered Geologist. Procedures for the advancement of borings, soil sampling, ground water sampling, equipment decontamination and sample shipment are outlined below. 4.1. PROBE BORING ADVANCEMENT Probe borings will be advanced using a van-mounted Geoprobe 5400 direct-push probing unit equipped with 1.25-inch probing rods.The Geoprobe advances soil probe borings using a hydraulic hammer to drive soil sampling tools to specified depths. Advanced GeoEnvironmental,Inc.