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<br />~~ <br />R. G. OTTO & ASSOCIATES <br />~::: <br />This formation was assumed to obstruct the movement of nearsurface <br />gzouad water down the Ralston Creek drainage, bringing nay <br />subsurfac~a flow to the surface where it would enter the stream at <br />the point of obstruction. <br />Semolina Procedures: Water samples were collected at Y~oth surface <br />water sites and at the well site in September 1983, December 1983, <br />February 1984, May 1984 and August 1984. Single grab _,amples were <br />collected at the well site in each case using a PVC bailer. <br />Several preliminary grabs were taken to flush standing water from <br />the well. A single grab was then taken, filtered (0.4;iu), split <br />and preserved according to USGS specifications for the individual <br />ii{; parameters. <br />~Gi1= <br />Surface water samples were initially taken as grabs an<i <br />subsequeatlp collected using a USGS standard flow-proportioning <br />collection device (DH-98 or a larger, dual-bottle version termed <br />the °Dolly Parton°). The device was lowered into the ~atream at <br />lixed, cross-sectional increments to obtain a sample <br />representative of the total llow at the time of collec•bioa. <br />Samples were split (using a USGS "churn-type" spliter) and <br />preserved (or liltezed and preserved for determination of soluble <br />phase constituents) according to USGS specifications for the <br />individual parameters. Stream flow, water temperature, <br />conductivity, pH and dissolved oxygen concentration were measured <br />in the field at the time of sample collection. <br />17 <br />