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�• - Martin Thorpe `—' <br /> 16 October 1987 - 9 WEISS ASSOCp7E3 VF <br /> gallons were withdrawn from MW-1, 80 gallons from MW-2, and 60 gallons from <br /> MW-3. The development water was directed to 55-gallon drums for temporary <br /> storage on site. Well development field data sheets are included as <br /> Attachment D. <br /> The estimated flow rates for the three wells are: 1.8 gpm for MW-1, 1.3 <br /> gpm for MW-2 and 0.8 gpm for MW-3. Well yields calculated from airlift <br /> evacuation are not as accurate as those from pumping and may be significantly <br /> less than the potential yield of the well . These flow rates are within <br /> expected ranges for the soil types screened. <br /> On 13 August 1987, 48 hrs after development, water samples were collected <br /> from the wells and a composite sample was collected of the development water. <br /> Samples were collected with steam-cleaned teflon bailers and were decanted <br /> into 40-m1 glass vials, labeled, refrigerated and transported under <br /> chain-of-custody procedures to B&C for analysis. <br /> �. B&C was only able to analyze these samples for TFHC and EDB. Therefore, <br /> the wells were resampled by B&C on 8 September 1987. Prior to sampling, B&C <br /> . personnel removed approximately 8. 5 well volumes of ground water from each <br /> well with bailers and a submersible pump. Samples were then collected with <br /> steam-cleaned teflon bailers, were decanted into 40-m1 glass vials and were <br /> labeled and refrigerated for transport to B&C. Copies of B&C chain-of-custody <br /> forms are included in Attachment A and B&C water sampling data sheets are <br /> included as Attachment E. <br /> ANALYTIC RESULTS FOR WATER SAMPLES <br /> Water samples collected on 13 August 1987 were analyzed Tor TFHC by <br /> GC/FID with a detection limit of 1 ppm and by CC/ECD for EDB with a detection <br /> limit of 0.6 ppb. Samples collected by B&C on 8 September 1987 were analyzed <br /> by AA for soluble lead with a detection limit of 1 ppb and by GC/PID for BTX <br /> with a detection limit of 0.5 ppb. TFHC was detected only in water samples <br /> from wells MW-1 and MW-3 at 13 ppm and 14 ppm respectively. Benzene was found <br /> in all three wells, ranging from 5.0 ppb in MW-2 to 2,800 ppb in MW-3. EDB <br />