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! 18 December 1997 AGE-NC Project No 95-0173 ! Page 5 of 10 ! well utilizing a dedicated, disposable polyethylene bailer and new nylon rope Sufficient sample was collected from each well to fill three 40-m1 EPA vials containing 0 5 ml 18% hydrochloric acid as a preservative, and two I-liter amber bottle Care was taken to ensure that visible air bubbles were ! not present in the VOAs after filling and capping Ground water sample containers were labeled with the well designation, date, time, and samplers initials ! Following collection, each sample was logged on a chain-of-custody form, placed in a chilled container and transported to CAL for analysis by previously noted EPA methods for TPH-g,TPH-d, BTE&X, MTBE, and by EPA Method 8260 for TBA, DIPE, ETRE, TAME, and to confirm and quantify any MTBE detected by EPA Method 8020 The results of the analysis are contained in Table No 3 25 DISSOLVED MANGANESE AND IRON Based on the guide How to Evaluate Alternative Cleanup Technologies For UST Sites (October 1994) published by the United States Environmental Protection Agency (EPA) Office of USTs,the presence of dissolved iron(Fe+2) in ground water can reduce the permeability of the saturated zone lie soils during air sparging operations The guide further states in Exhibit VII-12 Dissolved iron And Air Sparging Effectiveness that concentrations of dissolved Fe+2 less than 10 mg/l are acceptable concentrations for air sparging, concentrations between 10 mg/l and 20 mg/1 would require periodic testing or periodic replacement, if concentrations were greater than 20 mg/l, than air sparging was not recommended In preparation for in-situ air sparging at the site, one ground water sample was collected from AW1 (Interval A), logged on a chain of custody form, placed in a chilled container and transported to I Alpha Analytical Laboratories Inc (AAL) for analysis of Manganese and Iron The results of the analysis are contained in Table 2 26 STOCKPILE SOIL SAMPLES On 04 November 1997, four soil samples were collected from AW1 and AW2 stockpiled soil cuttings utilizing a slide-hammer and brass sleeves under the supervision of the PHS-EHD The stockpile soil samples were submitted to Castle Analytical Laboratories for one composite analysis of TPH-g, TPH-d, BTEX, DIPE, ETBE, TAME, TBA and MTBE in accordance with above mentioned EPA methods Analytical results of the composite soil sample are summarized in Table 4 The laboratory report (Castle Analytical Laboratory Reference No 1316) and chain-of-custody are included in Appendix D Advanced CeoEnvironmental,Inc I