SITE INFORMATION AND CORRESPONDENCE

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07/22/2002 16:10 2094 AGE STOCKTON#& PAGE 05 07 May 2002 AGS-NC Project No. 98-0466 Page 13 of 16 5.3.2. Stockpile Soil Sample Collection Discrete soil samples will be collected from soil stockpiles by digging approximately one foot into the soil stockpile and collecting a soil sample in a 2-inch by 6-inch metal sleeve by pressing the sampling sleeve into the soil by hand or using a metric sampler with a drive hammer, Soil samples will be collected from the stockpile at a minimum,frequency of one discrete soil sample for every 100 cubic yards of soil.Approximately 2,000 cubic yards of contaminated soil is contained in the stockpiles requiring a minimum of 20 soil stockpile samples to be submitted for laboratory analysis. It is anticipated that 10 soil samples will be collected from 5oil piles generated during excavation of the north bum pits, 6 soil samples from soil piles generated during excavation of the south bum pits and 4 soil samples from soil piles generated during exca iation of the former teepee structure. The collected soil sleeve will be preserved and labeled as d cribed in 4.3.1 above, but with a unique sampling locality designation. The preserved samples will be stored in a chilled container pending shipment to a DHS-approved analytical laboratory urIder chain of custody. 5.4. COLLECTION OF GRAl3 GROUND WATER SAMPLES Grab groundwater samples will be collected as described in Section 4. of the AGE-prepared Site Contamination Work Plan, dated 11 September 2001. 6.0. QUALITY ASSURANCY AND QUALITY CONTROL To ensure that data collected is of adequate quality, AGE will take the f9llowing measures: • All field personnel will be adequately trained in the proper collection techniques for the type of samples to be collected and the type of analyses required. In addition, all field personnel will have completed a 40-hour Health and Safety Course as specified in OSHA,Hazardous Waste Operations and Emergency Response Standard [29 CFR 1910.120(e)], and 8-hour annual refresher courses as necessary. • Analytical laboratories selected to provide samples analyses will be certified by the California Department of Health Services for the analytical services provided. • Field logs will be maintained for all field activities, including documentation of sample collection, description of sampling activity and rational for variation from this work plan, sampling methodology used, equipment calibration data, personnel involved in field work, all field measurements, relevant environmental conditions, and any other pertinent data that may affect data quality. • Samples will be preserved in the field as described in this work pl n in Sections 4.3 and 4.4. Adumced GeoEnslromme EA Ino.