WSPC06446

• File Number: 8220.106.A.1.c
• Description: Colorado River Water Projects - Animas La Plata - Description - Construction - Durango Pump Station
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 10/7/2002
• Author: DOI-BOR
• Title: Durango Pumping Plant - Stage I - Project Specifications - Volume IV
• Water Supply Pro - Doc Type: Report/Study

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GEOLOGIC LOB OF DRILL HOLE NO. etH05

8IEET I Ill' 7

FEATURE: DlNN60 PUMPIN& PUNT
LOCATION:
BE6UN; 12-12-88 FlNtSlED: 12-;2"81
DEf'TH iIll1) ELfV. Ill" "''''TEA
LEVEl. Atel DATE HEASlltED: 30 I 649"'.701

PROtJECT: AN]~ PLATA
COORDINATES: N 223'02." E
'TOTAl.. DEP'TH: 174."
DEPTH TO BEDROCK: 31.0
03-27-89

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STATE: COlORADO
8R01JtC) EL.EVATION: S49S.0
MIa.!: "FIClM HllIU2OHT.w.: '0 "BOAt_
..... L06Gal BY, Tll_""''''E~'SlONE
REVIEWED BY: "'7~~' V

CLASSIFICATION AND
PHYSICAL CONDITION

,t,PPRtlXIMATELY 65 PERCENT SILTY CLAY 6OU6E: FIRM;
BRAY. APPAOlCIMIoTE1..Y!l1l PERCENT lM6ULAA SAND TO
6RAYa SIZED SAJC)STONE AND SILTSTONE ROCK FAA&-
OEHTlI.

180.7" 174.1: CAETACEaB POINT UlOKCIU1' I&tD8TCIII
...u.

ea.7 .. 1'''.8: tN1"EMEDDED 8JLTI1lIE AIG lAIrD-
STOtE . R.U:
CONSISTS OF' ...PPftOX1M.lTELY !SO PERCENT SILTSTOPE
AKI APPAOXIMATE1.V I5D PERCENT SAIClSTONE.

SILTSTCHE - OCCASIllNAU.Y SANn, &RAY TO DAJI<
6FlAY: "APPROX]IUtB.Y 30 PERCENT aF BEDDINS IS
CONVOLUTED. LAMINATED TO VERY TKIM..Y eEIIJED ILESS
llIAN t/32 TO 0.1 FT THICK'!: FflESH OUl: NllDEA...TE-
LY son IHSJ CAN BE SCRl.TalED WITH MOOEAATE KNIFE
PAESSUFIE; "EAK TO NO REACTION WITH HCL.

SANDSTONE - OUARnOSE, FINE TO MEDIUM SflAlNED.
U8HT &RAY; vatY THIMl.Y TO THIN..Y BEOOm 13/8
IN. TO 0.2 FT.I: ~ (W1): MODERATELY HARD lH41
L DIFf'ICUL. T TO SCA~TCH NITH KNIFE: NO TO STRONG
I REACTION Nl1l4 HCL.
.
0VEA.lU. INTEflVAl. IS IHFl..UDICED BY THE 0VEFlI.. YING
F~Ul.T AND 8EOOIN& IS ORIENTED 20 TO .2 DEBREES
FROM CORE AXIS: mACES OF DISSEMINATED PYRITE ARE
PRESENT Al.ONG 8EDDIN6. BEDROCl( FAOM 160.7 10
-'6".D n. ANtI -'67.7 TO '68.11 FT. cmnAIHS NlJItoo
EROUS F1ANDQM FfUCTURES SOME FllU.ON BEOOIN& NHILE
OTHERS OFFSET IT UP TO 0.1 FT. lHE OFFSETTING
FRACTlJAES ARE NOT eoNTItraJOUS ACROSS THE CORE.
THE. FRACTURE! ARE HEALEtI BV.S/11 TO 1/2 1M. OF
GUARTZ AMI CALCITE. INTENSEL v FAACl'lJAED rFD71
FROM S10.7 TO 173.8 n. NITH OISCOHTINUlTIES
PRESENT. AT .lN6US FROM THE CORE AXIS AS fOLLONS -

12 BEDDING PLANE JOINTS; 2S TO U DE&AEES; SPACED
1/2 IN. TO 1.0 FT.; TIBHT IDO) TD ISLJ6KTLY OPEN
IOU: ClEAN ITOI TO VERY TtlIN "U IlFlLLIN9 OF
SILT AND CUT:: FRESH. (Nt): PUNAR; ..ooou."TELY
ROU8tI tR3) .TO Sl...IBHTL Y ROUSH "oil): SOME .JOINTS
HAVE FAINT SLICKENSIDES AL0N8 DIP 10 as DEIAEES
COUN'TER-O..OClUllSE FflOM 1lE .JOINT DIP.

6 JOINTS AT 2. TO .2 DE8REES: SPACED 2.. TO 0.8
n.: TltHT 1001 TO SLI8HTL.V OPEN <<IU: VERY
THIN !TU IMFILLIMB OF SILT AMI CUY, AND COAT-
IN6I OF PYRITE: fAEStI (NU: MCJEJeU,TEl.Y AOU&H
IA!II AND lAAEIllLAR TO Sl..JBH1'l Y RDUllH IR4J AtCD
PUtrWl; LOCATED FROM 152.8 TD 170.8 FT.

1 JOINT AT 150 Dl:6AEES; TI8MT 1001 TO MODau.TELY
t- OPEN 1D21: MtlEEAATELY THIN 1T2J COATINGS AMI
CflYSTALS OF CAl.CITE. GUART1 AtCl PYRITE: FflESH
DIU : PAATl,. Y HEALED CtL5J: MOOERATEl. v ROUSH
~ 1A31: PLAIWt Locum AT S1S2.8.

I SHEET 6 OF 7 I DRILL HOLE DH-10S

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