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5' 18 July 2008 AGE-NC Project No. 98-0452 Page 3 of 5 3.1. PRE-FIELD WORK TASKS Site assessment permits will be obtained from the EHD.In addition,an update to the site health and safety plan presently on-file will be prepared in accordance with Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). Prior to mobilization, the proposed probe boring will be clearly marked and a utility clearance obtained through Underground Service Alert. 3.2. SOIL AND GROUND WATER SAMPLE COLLECTION AND ANALYSIS AGE proposes to advance three soil probe borings for the collection of soil and ground water samples,using direct push technology;proposed probe boring locations maybe modified due to field observations. Proposed probe boring locations are shown on Figure 2 and are as follows: • Boring B6, located 10 to 20 feet west of well MW-4, advanced to an approximate depth of 35 feet below surface grade(bsg)or until a second water bearing unit is encountered,for the collection of a deep grab ground water sample; • Boring B7, located 75 feet northwest of well MW-4, advanced to an approximate depth of 10 feet bsg, for the collection of soil samples and a shallow grab ground water sample; and • Boring B8,located 80 feet west of well MW-4,advanced to an approximate depth of 10 feet bsg, for the collection of soil samples and a shallow grab ground water sample. Soil samples will be collected at 5-foot intervals from shallow grab ground water borings B7 and B8. Soil samples will be collected at 5-foot intervals beginning at a depth of 5 feet bsg in boring B6, in order to locate a second water bearing unit to collect a deep grab ground water sample. AGE anticipates,based on the boring log of the on-site domestic well (provided in Appendix B) and the lithology of the adjacent sites,that second ground water will be encountered at approximately 35 feet bsg. Soil samples collected from boring B6 will be analyzed for COC however soil samples from the remaining borings may not require analysis (based on filed observations). Grab ground water samples from each probe boring will be analyzed by a CDPH-certified laboratory for the constituents listed in Section 2.0. Grab ground water laboratory reports of analyses, testing methods,laboratory QA/QC reports,and sample chain-of-custody documentation will be presented in a report with findings and recommendations.Field procedures for advancement of probe borings and collection of soil and ground water samples are presented in Section 4.1. Advanced GcoEnvironmental,Inc.