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SDC11 Three wells, Gk'-522, GW-525, anc Gl5 -$.~ ere comple xd in the upper region of spoils ibel on the US GS lysimeter study site) which is generally unsaturated. Neil GN-S23 sometimes shows water in late February', March, and P.p ril as snow melts quickly off this westerly facing slope. Well GW-522 showed a two-foot increase in water level after a slug test in October of 1961 and increased slightly only during spring runoff. Water is most likely trapped in a sump created by having drilled into an impermeable boulder in the spoils. Three wells, GW-525, GW-526, and GW-527 arr. situated in .lower spoils adjacent to the Watlge Impoundment which receives spoils water discharge. All three of these wells were outfitted rrith continuous recorders operated 6y the US Geological Survey (USGS) until the end of 1983. GW-525, the highest of these three wells on the spoils slope, shows a typical seasonal variation (3 .5 feet in 1966). GW-527, lowest of the three, and GW-526, located between GW-S 25 and CW-527, show minimal seasonal changes. The water levels in wells GW-S27 and 526 are most likely dependent upon the water level in the Wadge Impoundment located 50 and 100 feet away, respectively. These findings are also supportel by the US GS personnel operating the recorders prior to 1984. The low water level noted on November 1985 at well GW-527 is likely a result of the lowering of the level of the Wadge Impoundment because of the siphoning for the truck wash facili_i es mentioned earlier in this tent. 8. Water Quality Ground water samples are collected from twenty Seneca II fli ne wells on a biannual basis. The water samples are analyzed according to one of the two parameter lists, a "short" list and a "tong" list presented on Tables 5 and 6, respectively. Analyses have been performed by Bookcliffs Laboratory in Steamboat Springs, Colorado since May 31, 1983. Bookcliffs Laboratory is EPA certified and performs all analyses by EPA or equivalent methods. Samples are delivered the day of collection to the lab in an iced cooler. The following discussion of the analytical data collected du ri ne the reporting period is arranged by strata being monitored and coincides in the manner in which the analytical data are presented in Appendix B. Ground water quality sampling procedure varies from well to well. The procedure used depends upon one or more of ttie following variables: casing diameter, rate of recovery, casing storage volume, depth to water, and site accessibility. As a result, the specific 14