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' MAR-16-96 14.64 FROM. AGUIR'ENGINEER6 INC. ID, ~ PAGE 17 <br />•. .. . <br />Mrs. Ann Tatum <br />March 18, 1885 <br />Page 7 <br />The railroad is at the upper end of the valley floor at the base of the hillside. The railroad <br />grade la partially excavated Into the hlllaide. Immediately south of the home, there is a small <br />ridge and a email valley. Whore the railroad cute through the small ridge, coiluviai material and <br />some bedrock outcrops are exposed. There fa a small debris fan below the valley, through <br />which the railroad Is cut. The colluvlum appears to be clay with some pebbles end gravel that <br />looks like debris flow material. <br />Fietuming towards the home in a southeasterly direction we descended from the highest to <br />the Intermedlete level terrace. 8ehlnd the house, the scarp between the highest and the <br />Intermedlete terrace fa obscured by colluvium from the small drainage that Is roughly centered <br />on the home. <br />To the southeast there is a terrace escarpment that is about 10 to 20 feet high. Tha materials <br />exposed on the terrace ors river gravels and cobbles. About 200 to 300 feet east of the <br />residence at the base o} this escarpment. there is a spring. At the time of our visit, the spring <br />'was flowing weekly, leas than n gallon a minute. There is an unused, empty stock tank. <br />Towards the residence there Is another spring feeding an active stock tank that was brim full. <br />A smell trickle of water from a pipe coming out of the hlllaide empties Into the tank. The <br />emerges relatively near the top of the elope. Tha Around for 50 or more feet on either side <br />of the spring, but especially towards the house, Is very soppy as this is an area of seepage. <br />My interpretation hero is that the terrace deposits are relatively thin and overlie the bedrock <br />materiel that creates an aquetard. Groundwater within the terrace is actively seeping where <br />this relatively impervious bedrock outcrops Haar the terrace slope. <br />Adjacent to the residence itself, where the river mnkes its most northerly meander, it is cutting <br />Into bedrock. Due north of the home, the river flaws directly on bedrock for several hundred <br />feat due north of the home. The meander turns back to the east to pass under the driveway <br />bridge leading to the house. <br />r:~e.~2eot e~xeol e...w~ •- <br />