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i <br /> 3.6 WATER SAMPLING <br /> All sampling equipment was steam-cleaned and/or washed <br /> in TSP detergent prior to sampling and between sampling <br /> points. Immediately prior to sampling the three wells, the <br /> water levels and well depth measurements were taken by the <br /> # sampling technician. All three monitoring wells were purged <br /> _ using a hand operated air-lift pump. <br /> ~----, pter condition <br /> � parameters were measured and lodged <br /> during tie----mWling of the wells. These parameters included <br /> temperature, conduct-i-tity and pH. Samples were collected <br /> U only after at least three well. volumes of water were removed <br /> and the measured parameters had stabilized. For sampling <br /> data, see Figures 3, 4 and 5 in Appendix C. <br /> ! Initial depth-to-water measurements were made prior to <br /> I development of the three monitoring wells, and all wells were <br /> allowed to recover to 90% of their initial levels prior to <br /> sampling. The samples were carefully poured from the bailer, <br /> into clean glass VOA'S provided by the laboratory. care was <br /> taken to ensure that no air space existed in the vials by <br /> inverting to check for bubbles, and re-sampling if necessary. <br /> The samples were analyzed or extracted within the sample <br /> lifespan limits as set forth by EPA guidelines for the <br /> specific tests to be run. <br /> 3.7 SOIL SAMPLING <br /> Relatively undisturbed soil samples were taken at <br /> intervals of not more than 5 feet, in order to identify the <br /> I subsurface materials within the unsaturated and saturated <br /> zones transversed by the borings. At approximately five-foot <br /> intervals within the unsaturated soil strata at each boring, <br /> t? soil samples for the purpose of lahoratory analyses were <br /> ob*ained. <br /> It The soil samples were collected using a California <br /> Modified split-spoon sampler with brass liners. The sampler <br /> was driven by a 140-pound hammer repeatedly falling 30 inches <br /> (ASTM Standard 1586) . <br /> t `r <br /> 11 The laboratory samples were not allowed to have <br /> headspace and were immediately sealed in their liners using <br /> ji aluminum foil-lined plastic caps taped in place. <br /> r:t The samples for geologic analyses were logged in the <br /> field and retained in labeled plastic baggies for any <br /> Is' necessary future reverence. <br /> F"7 <br /> --- -- - r-e ---- - -- ETS -ENVIRONMENTAL- ASSOC.- - <br /> .C'3 PROJECT 305, PAGE 7 . <br />