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_J <br />\ <br /> <br />5^IL b FOUI:UJ.TION <br />EN GINLERING <br />/~ w • i .1 ,-. <br />~.. <lr iY C-0{ir Cl: L.. •S JI..i~:v .1 ::~\. ~~.~r rc.J \~.• ~.• <br />` t +t - <br />COfjI~S`ULTING ENGINEERS '~- <br />r ,, ~,,• <br />9G S. ZUNI DENVER, COLO(:AbO CO?23 303!74.1 -710b <br />1924 EAST fIR ST STR ECT CA ~i'G R. +YY U:.I IJJG 8: b01 • ~ 3G7/.7•i-21iG <br />- October 22, 1973 <br />SubJect: General feology and Subsoils at the <br />Sludge Disposal Area near 1'Joody Creek, <br />Pltl:in Lounty, Colorado <br />•. Job IJo. 10,23 <br />L <br />1!ri~ht-14c Laughlin Engineers <br />2420 Alcott Street <br />Ocnvcr, Colorado 60211 <br />Gentlemen: <br />Conclusions: (1) The dlsposal site is underlain by a thick deposit of <br />outwasl+ gravels which overlie~itancos shale bedrock. (2) Field :+ercolation <br />rates for the upper subsoils range from 30 to GO minutes per 'inch. Sorne <br />discontinuous lenses showed percolaiton rases as fow as 240 minutes per <br />inch. (3) Hater level elevations in ad)acent wells range from 41 to 100 feet <br />below the surface elevation of [hc disposal site. <br />Scooe: The results of a general geology and subsoil Investigation at the <br />sludge disposal site near ldoody Creek, Pltkin County, Colorado arc discussed. <br />Opinions and observations discussed result from a field investigation conducted <br />in mid-October; 1973• At this tir..e several test holes were drilled, typical <br />subsoil samples mere taken and returned to our laboratory for analysis, and <br />several fleld.percolatlon tests were run, <br />Site Conditions: The dlsposal site is located on a prominent~r.iver terrace <br />near lJoody Creek, Colorado. The site is in the eastern one half of Section 16, <br />T.9S., R.85w., as shown on Fig. 1. Approximately $8 acres are used for the <br />dlsposal of secondary activated sludge. The sludge is presently being trans- <br />ported to the dlsposal area by truck where it is then sprayed ion the ground <br />surface and allowed to either evaporate or percolate into theiupper subsoils. <br />The dlsposal site Is situated on a proml-ent terrace above the Roaring <br />Fork River. The terrace surface is nearly level w(th a slight slope, from 1$ <br />to 24, dolYn valley toward the north. The terrace gives way to an er.trer.,ely <br />steep (60q) escarpment which leads down to the Roaring Fork River to the <br />rest. Another very steep escarpment bounds the terrace on the cast. This <br />escarpment leads up to a higher terrace l.:hlch is about 120 feet above the <br />disposal site: Elevations are around 7,440 feet at the higher; southern <br />end cf.the disposal area and 7,4f)0 fee[ at the lower northern end• <br />.i <br />;J <br />:~ <br />