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Fall 2007 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />l'hick soil and colluvium derived primarily from the Wasatch Formation were observed along <br />this traverse. The estimated thickness of the surticial material ranges from 75 to 250 feet, or <br />perhaps locally 300 feet. The colluvium on the sides of Dry Fork valley locally merges and <br />mixes with the alluvium in the Dry Fork valley floor (Figure 31). <br />In contrast to the small seeps and springs, and local water flowing down the road in the April <br />?007 traverse, no flows were observed during this September traverse. <br />~. ~ y _r <br />I' y~t~JyY l t) ~ '1 I ~ ~ f ~~µ •~ ~~~ Il ~` r7 • ' ~~. ~ y ~ `' <br />,,,~~ T :;w~~ <br />a +k ~~r ' "t , St j <br />gip; ! ~ , - +` <br />~ . ~tj ~~. 'y ,-'I ~tA~lt yap a., I ~ `N ~,~ <br />.~ ~,~t ~~~.~ :, ~, <br />~ • ~ ~, r` ~ ~, P~1' fay <br />`•~ ~ -~ Z~+~L~..1 J'f "~n~,s ~1 ~ . ~ 1 k f ltE f~17;. !, , <br />~ ~~~" ~ ~ y 4'1 i~~K .i(.~.' ~ <. ~ ~171Y`Y i~ ~)'~ll~y~~ yam. ., <br />• <br />Figure 31. Northwesterly view of the Dry Fork of Minnesota Creek near the SOD permit boundary. The higher <br />water level in the stream was the result of a beaver dam located out of view (to the right of the photo). <br />5.9 Location 12 (Location 17 of the Spring 2007 Field Visit) <br />"Phis is the site of subsidence cracks at Apache Rocks (Figures 32 through 36). The cracks, <br />which are straight to branching, as much as 17~ feet long, 2~ to perhaps 30 test deep, and as <br />n~urh pis ~ inrhrs wi~i~, are: lc,~at~xi in th~~ tin<i~,n i~,nc ah~,~ ~ the s~,uthrrn rri~~~ cif `~at~ r~~~icl <br />831-032.780 Wright Water Engineers, Inc. Page 46 <br />November 2007 <br />