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r- <br /> 4 <br /> r <br /> , <br /> , <br /> The full report of installing Monitor Wells 9, 10 and 11 is <br /> presented in the "'Phase II Investigation Report" dated duly 7, <br /> 1990. At the time, Monitor Wells 9, 10 and 11 were installed no <br /> contamination was found in any soil samples. Monitor Well 10 had <br /> a TPH level of 5B ug/1 while Monitor Well 11 had a Benzene level <br /> of 1.0 ug/1 and TPH level of 400 ug/l. <br /> 'rhe 2" casing on .Monitor Well 9 partially collapsed at a <br /> depth of 30 feet, probably due to heat or hydration of the grout, <br /> therefore, a 1" diameter sampler must be used to 'bail and obtain , <br /> samples. <br /> Sampling Procedures March 19 1991 <br /> ' Monitor Well _9 (2" Well): Fourteen (14) gallons were bailed <br /> rom this well and contained using an air operated <br /> Dy pump f1/2" <br /> diameter pump and a 1/4" diameter discharge tube. At completion <br /> of bailing, the 1/2" diameter . pump tube was permitted to fill <br /> with water and the entire tube -,;as retracted on a reel and the <br /> samples then taken from the tube, <br /> ;w <br /> Monitor Well 10 (2" Well) : .Four (4) gallons were bailed <br /> using a - Teflon ba ler and samples were taken using the <br /> same bailer. <br /> Monitor Well 11 (4" Well) : Twenty (20) gallons were bailed <br /> e taken using3 PVC bailer. Samples wer <br /> from t1as well using a <br /> y <br /> the same bailer. 1l <br /> A11 water bailed from the wells was barrelled on site. <br /> plastic sheeting and reels were used on the surface to prevent <br /> contamination of boilers, pumps and lines. <br /> ? Tomperatures, conductivities, Ph, TDH, and Chlore depths to <br /> water were also measured. _�. minimum of 2-1,000 ML and 4-40 ML <br /> taken from each well. 2-40 ML samples <br /> samples were tank were <br /> preserve with I:CL acid. 2-40 ML samples were not preserved. <br /> 1111 samples were refrigerated and delivered with -chain of <br /> custody to the laboratory. <br /> i 'Fable 1 presents the results of water analysis. <br /> I TEble 2 presents deptn to water table, gradients and <br /> �r E directions. <br /> S[,MMFLRY <br /> The groundwater gradient has varied from approximately S 20° <br /> E to N 20° E during the year from March go . to March 91 and <br /> during the same period depth to groundwater has fallen from 42+ <br /> --i-- feet-deep-to-70+--feet deep. The regional groundwater gradient is -- -- <br /> J 2 <br /> • " � . _ ... ..._ ..... .._..., a ... - .. n i.. <br />