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<br />' 9 SURFACE WATER MONITORING STATION
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<br />Iron 1 l I \ — _ &6• GROUND WATER MONITORING WELL
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<br />SPRINGS, PONDS & STOCKPONDS
<br />S -1 = Spring
<br />28 \ 27 I 6 ` .'/ 0 29 SP -1 = Spring with Pond
<br />C) I, EC 23 25 \ 27 /' ECSP -1 = Stockpond
<br />]�. �jECSP•22 �7' csP•1s \ 9200 26 25o \ A H = Springs & Stockponds
<br />terror cre k \ 2 ECSP•17 PERMIT BOUNDARY
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<br />j ill STOCK I 1 oo O \ a $600 - 00 DITCH
<br />\ 1 Tow ,' I STOCK PO P -28) \ \\ RAILROAD
<br />1 I 82001 400
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<br />o sa�1 -1 9a, :m '�• _..._... LAKE
<br />3 o 21 31 (s000 , — a 0 PAVED ROAD
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<br />fC D - GEOLOGIC HAZARDS BOUNDARY AREA
<br />u r ' �i QT& i Qsfo1, 0191 �0 F
<br />,1 r a `\ \ - EXPLANATION OF GEOLOGIC HAZARDS UNITS
<br />Qla 1 H 1 100 B
<br />A 1s 1 - LANDSLIDE
<br />8800 – \\ –% > r , 1S2 (Relative age of landslides is indicated by subscripts [ 1 is the youngest ] )
<br />SSa ri I l �r \`♦ _ , / QefC1,8 1`\_,–
<br />° — (P 8600 is g
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<br />mf - MUDFLOW
<br />S-4a r � �6 \ 52-2 O � 1r ' ---- -- ' , � – `
<br />sa , o o �, (r j �o da - DEBRIS AVALANCHE
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<br />4 2r –' i Qd� 1s, ♦�� 2. _ r ' 111 `♦ I I` / E P8 �'1 f / 8400 I S22 2 0
<br />t ) l Qa C1 SP-6 I (f) I rf ROCKFALL
<br />I ,- - ' ' - �, - \•. ; afQ 1 ; ; , ' , \ \. � ' , - -
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<br />df - DEBRIS FAN /' 1 200 1
<br />df 2 (Relative age of debris fans is indicated by subscripts [ 1 is the youngest ] )
<br />8000 I ° sfc 1 - SLOPE FAILURE COMPLEX
<br />` I a i ♦ \ j \ \n , i / % ( \ SP21 \ \v – ate 2 (Relative age of this unit is indicated by subscripts [ 1 is the youngest ] )
<br />o \ o , .\ I No co . \ 1
<br />Q19 1 \♦ ° sfc 3
<br />8 Q ♦ rn
<br />I \ - _ ) us - UNSTABLE SLOPE
<br />z °0 ° 1 �I ` (i -`` ' mL� pus - POTENTIALLY UNSTABLE SLOPE
<br />Chao -- • C�?, r i pfp - PHYSIOGRAPHIC FLOODPLAIN
<br />,� n ) ; % ♦I ' \ 11 1 11 i ,' ) \`\ �'� �1 �l 1\ 11 \ ♦ \\ , f O ° (P �i'' l'. r /t ��'O ♦ 1 i /' - �'T_- 1 sf - SHEET FLOW FLOODING AND EROSION
<br />0 00
<br />- p —' pms - POTENTIAL MINE SUBSIDENCE
<br />0o I I 1 0 � i' I, I � _ , -IQ a 11` i5 ,� � 1 e
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<br />' I ♦ ♦ 1. i,_I � �� � °- ' � i r o � r ` � � 6 o ph - POTENTIAL HYDROCOMPACTION
<br />k C. � t - _ C _ -- - ��' (u , - -� 68 es - EXPANSIVE (SWELLING) SOIL OR ROCK
<br />00 1 �— ' r 'e i 'V� � ♦ \ N\ : ' f �
<br />Q1a 1 S- 0�� - - -'
<br />Ef�14 o I
<br />400
<br />rf ea) �' flF� 1 , Afi /son OF
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<br />-- (P!P). / •'� `,/ (�) ; � //' r Qls2 1\ `x- r '~' `� o w• -�0 / u9 � �l / I�r f � RECEIVED
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<br />/ \NG ` / 1 �• • . i - ' _ x'00 / po Division of Minerals and Geology
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<br />•.•\ � / ' / Z I � 1Q 1 �a / a0 % 0 SCALE
<br />2000' 0 2000' 4000'
<br />2 I O 24 o Q I o �^ f,
<br />9 O00 / CONTOUR INTERVAL 40 FT.
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<br />( � X00 Q • .
<br />f Issued for PR05 11102 Nettleton J. Gates J Nettleton
<br />/ w Oo 0 J. 0 Issued for PR -04 5 15100 JNettleton J. Gates JNettleton
<br />REV.
<br />AT
<br />REVIEWED AND
<br />No
<br />REVISIONS
<br />DATE DESIGN BY DRAWN BY
<br />SIGNED BY
<br />EXPLANATION OF GEOLOGIC MAP UNITS Glacial Deposits
<br />Tow - Ohio Creek Wasatch Formations (Eocene and Paleocene): Qal - Floodplain alluvium (Holocene): Mixtures of silt, sand, pebbles, and cobbles that QTa - High-level alluvium (Quatemary/Tertiary): Bouldery alluvial deposits that form Qdfl,2- Debris -fan deposits (Holocene to late Pleistocene): Unsorted, unconsolidated Qcw • Colluvial -wedge deposits (Holocene to late Pleistocene): Unconsolidated,
<br />Var- colored (usually red, purple, green, yellow, and gray) mudstone and sitstone with have been recently deposited and/or reworked by fluvial processes. The alluvium planar, gently sloping surfaces high above modem streams. The location and debris of soil, rock, and displaced vegetation deposited where stream gradient heterogeneous soil material and rock fragments found near the base of a slope.
<br />interbedded medium -gray, lenticular sandstone and conglomeratic sandstone. The forms the physiographic floodplains of the modem drainage system and is a occurrence of the deposits (Tweto and others, 1976) suggest formation during decreases. This gradient decrease most commonly near the confluence of a Formed by gravity- dominated processes, the deposits may be subject to X B P.O. Box 535
<br />formation snare// Is obscured b suficial deposits, is prone to mass•wastin , and potential source of sand, ravel, and crushed -rock aggregate. the Tertiary or early Quaternary. These deposits are subject to sheet flooding tributary stream with a larger trunk stream. Usually composed of mud, sheet -, and continued mass - wasting. O
<br />generally y p0 p 9 9 99re9 and erosion. debris -flow material, the deposits result from the rapid movement and deposition
<br />is potentially unstable. pas - Slope-wash debris Holocene to late Pleistocene): General/ fine-grained soil and of solid material during unusual) heavy n or snowmelt runoff. Qdf de Its
<br />( ] y Colluvial Deposits 9 y : df Sanborn Creek Mine Somerset CO. 81434
<br />KtTtV -Mesa Verde Formations (late Cretaceous): rock detritus transported and deposited by running water that is not confinled to probably formed during the Holocene; Qdf2 deposits most likely were deposited +
<br />Brown, gray, and light gray to white sandstone interbedded with dark gray shale. channels. The deposits form a relatively thin veneer over older surficial deposits during previous glacial stages.
<br />Commercially important coal beds occur in the lower part of the formation. The or bedrock, may include some wind -blown (eolian) material, and may be easily of - Landslide deposits (Holocene to late Pleistocene): a heterogeneous assemblage PROJECT:
<br />of unconsolidated soil and/or rock formed by slow to rapid downward and outward Qda - Debris- avalanche deposits (Holocene): Unsorted mixtures of soil and rock
<br />formation forms very steep slopes which are subject to rockfalls and other mass- eroded if protective vegetation is removed. mass movement in response to gravitational stress. These deposits, which include material formed by their generally sudden and rapid downslope movement and PERMIT REVISION PR-04
<br />wasting processes. In many places these steep slopes are stable. earthflows, usually form an irregular, hummocky topography and may have an deposition. Usually formed during periods of rainfall, the deposits generally
<br />Kttt MancQ$ Shale (late Cretaceous): Qagy - Younger alluvial gravels (late Pleistocene): Poorly sorted, rounded to subrounded, associated main scarp. Relative age of the deposits is noted by subscripts (1 is produce a relatively small, elongate rise that may extend out to gently sloping DRAWING TITLE:
<br />unconsolidated pebbles and cobbles in a matrix of sand and silt. These giravels vary the youngest). Qlst deposits most Ikely were formed during the Holocene and Qls 2 areas below the steep slopes from which the materials originate.
<br />A dark brown to gray laminated silty shale which is prone to erosion and mass greatly in composition because of local source conditions and they cap thee first and QIs3 deposits probably were formed during the Wisconsin glacial stage.
<br />wasting especially where mantled by thin colluvium. The shale locally contains well- defined terrace above modem streams. Sheet flooding, erosion, and local Qsfc1,2,3 - Slope- failure - complex (unit) deposits (Holocene to late Pleistocene): REGIONAL GEOLOGY /HYDROL OG Y
<br />swelling clays (montmorillonite) and water corrosive to concrete. Flash floods swelling soils are important geologic hazards associated with these gravells. Qmf - Mudflow deposits (Holocene): Clay and fine-grained debris that may include larger Unsorted mixtures of soil and rock material formed by various mass - wasting
<br />and mudflows occur along drainages that traverse the Mancos Shale. rock fragments incorporated into the debris during downslope movement of the wet, processes including landslides, earthflows, mudflows, soil creep, and debris
<br />Qagm - Middle alluvial gravels (middle Pleistocene): Poorly sorted, rounded to subrounded, viscous mass of soil and rock material. The deposits have a youthful physiography avalanches. Not all of these processes occur within a specific deposit and the
<br />poorly consolidated gravels in a fine - grained matrix. These gravels have a better developed characterized by a gently undulating topography with an incised, braided drainage age of movement may vary with a particular area. The general age of the unit is
<br />soil profile and have a greater amount of weathered igneous-rock fragments than the younger network. With decreasing viscosity during movement the deposits grade to fluvial noted by subscripts (1 is the youngest). Sheet 1 Of 1 Sheets
<br />alluvial ravels. Middle ravels include alluvial -fan and river- terrace materials, forth near/ sediments and with increasing viscosity grade to slow- moving earthfiows.
<br />9 9 y MONTGOMERY WATSON SCALE. DRAWING No.
<br />planar surfaces situated at two or more levels, and are subject to sheet flooding and erosion. Fe
<br />1.1000, 2.04 -M2
<br />
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