SITE INFORMATION AND CORRESPONDENCE

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07/22/2002 16:10 2094 AGE STOCKTON PAGE 04 07 May 2002 AGE-NC Project No, 98-0466 Page 12 of 16 • Notify AM&M 48 hours prior to field work to obtain clearance for boring locations with regard to underground structures or utility lines. • Notify EHD 48 hours prior to commencement of field work to schedule grout inspection. • Notify RWQCB 48 hours prior to comtnencemcnt of field work 10 schedule inspection. 5.2, PROBE BORING ADVANCEMENT Soil borings advanced for collection of`grab' ground water samples will be advanced utilizing a truck-mounted,hollow-stem drill rig and 8-inch diameter hollow-stem augers;the three shallow soil borings proposed within the former teepee incinerator pit will be advanced utilizing `direct-push' techniques. Cuttings generated during drilling will be placed on plastic sheeting and covered with plastic sheeting. Rinseate will be containerized in properly labeled DOT roved 55-gallon drums, and stored on-site in an area lacking public access. Disposal alternatives will be evaluated based on results of soil and water analysis. To properly abandon the soil borings, each boring will be backfilled to surface grade with portland cement utilizing a tremmie pipe 5.3. SOIL SAMPLE COLLECTION Soil samples will be collected from probe borings advanced utilizing the bollow-stem auger rig as described in Section 4.3 of the AGE-prepared Site Contamination Work Plan, dated 11 September 2001. 5.3.1. Former Teepee Structure Incinerator Pit 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. Soil will be sampled from the three `direct-push' borings at 5-foot intervals beginning at 5 feet bsg using a 1.125" Geoprobe soil sampling assembly loaded with four six-inch brass sleeves. Upon sample retrieval,the ends of the second sleeve will be covered with Teflon sheets, capped and sealed with tape. Each sample sleeve will be labeled with the boring designation, depth, time, date and sampler's initials. Appropriately sealed and labeled samples will be placed in a chilled container on ice and transported under chain-of-custody procedure to a DHS-c rtified laboratory. Soils encountered in the borings will be visually classified by an AGE geologist in accordance with the Unified Soil Classification System(USCS). Additionally, soil samples wi be field-screened for the presence of volatile organic compounds using an OVM. Advanced GeoEnviron utal,Inc.