DEVELOPMENT OF COUNTY-WIDE HYDROGEOLOGICAL AND ...€¦ · DEVELOPMENT OF COUNTY-WIDE...

DEVELOPMENT OF COUNTY-WIDE HYDROGEOLOGICALAND HYDROLOGICAL GIS MAPS FOR

PITKIN COUNTY, COLORAO

Phase 2 of the Development of County-wide Maps for GIS-BasedGroundwater Resources Evaluation, Pitkin County, Colorado

By:

Paul K.M. van der HeijdeHeath Hydrology, Inc.

Boulder, Colorado(under subcontract with Integral Consulting Inc.)

and

Dr. Kenneth E. KolmIntegral Consulting Inc.

Louisvile, Colorado

for:

Pitkin CountyHealth Rivers Board and

Board of County CommissionersColorado

Contract No. 195-2010

July 8, 2011

County-wide Hydrogeological and Hydrological GIS layers Integral Consulting Inc. - 2/24

Contents

1.0 Introduction............................................................................................ ............................. 52.0 Developing a Coherent and Consistent Hydrogeological Nomenclature............................... 63.0 Development of County-wide Hydrogeological GIS Data Bases........................................ 15

3.1 Digitizing Geological Maps and Creating Hydrogeological GIS Data Bases for the

URF Study Area.................................... ....... ......................... ...................................... 153.2 Completing the Hydrogeological Mapping of Unmapped Sections between Previous

Study Areas................................................................................................................. 163.3 Modifying the Structure of the Hydrogeological GIS Data Bases Produced in the

MRF, CSC, and CR WS Studies............................ ....................................................... 173.4 Creating County-wide GIS Layers and Data Bases for the Major Hydrogeological

Units............................................................................................................................ 183.5 County-wide GIS Map for Use in Conjunction with the Groundwater Resources

Evaluation Procedure...................................................................... ........ ........... .......... 204.0 References......................................................................................................................... 21

Appendix 1. Data Sources............... ........................................................... .............................. ...... ...22

Table 1.

Table 2.

Figure 1.

Figure 2.

Figure 3.

Figure 4.Figure 5.Figure 6.Figure 7.Figure 8.

List of Tables

Correlation of Geological and Hydrogeological Units in Pitkin County and theirComposition and Hydro geolo gical Characteristics. .................................................... 9Hydrogeological GIS Data Base Structure - Field Definitions. ................................17

List of Figures

Location of the Central Roaring Fork Tributaries (CRFT), Crystal River and WestSopris Creek (CRWS), Capitol and Snowmass Creek (CSe), Middle Roaiing Fork(MRF), and Upper Roaring Fork (URF) Study Areas, Pitkin County, Colorado. ........6Map of Pitkin County Showing the Area Covered by Geologic 7.5-MinuteQuadrangle Maps (Scale 1 :24,000) published by the U.S. Geological Survey (USGS)and the Colorado Geological Survey (CGS) and the coverage by the 1°x2° Geologic

Quadrangle Maps (Scale 1 :200,000) Published by the USGS. ....................................7Hydrogeological Units ofthe Upper Roaring Fork (URF) Study Area,

Pitkin County, Colorado. .......... .......... ................................................ .................... .16Hydrogeological Units in Mapping Gaps Between Previous Studies. .......................17County-wide GIS Layer of Quaternary Hydrogeological Units.................................

18

County-wide GIS Layer of Bedrock Hydrogeological Units. ....................................19County-wide GIS Layer of Hydrogeological Structures. .. ......... ............. ................ ..19County-wide GIS Map showing the Watersheds and Stream Layers.(The Left Display Area is the Table of

Contents (TO C) Showing All AvailableLayers and the Legend for Activated Layers; the Right Side of the WindowIs the Map Display Area showing the Activated Layers.) .........................................20


1.0 Introduction

Under an agreement with Pitkin County, Integral Consulting, Inc. (Integral) of Louisville,

Colorado in cooperation with Heath Hydrology, Inc. (HHI) of Boulder, Colorado was tasked tocomplete a series of geographic information system (GIS) maps. These maps areto be used inconjunction with the earlier developed groundwater resources evaluation procedure as planningand landuse management tools by Pitkin County. The project consists oftwo major elements: 1)conducting a Hydrologic and Environmental Systems Analysis (HESA) and preparing supportingGIS maps of the area covered by the watersheds of the streams tributary to the central RoaringFork (CRFT) between the towns of Basalt and Aspen, Colorado, including the Fryingpan River,Maroon Creek, Castle Creek, Hunter Creek, Woody Creek, and the City of Aspen; and 2)integrating the results of the focused HE SA and resulting GIS maps with the GIS mapsdeveloped in previous studies, providing county-wide coverage of the hydrogeology.

The project is a follow-up of previous studies performed by Hydrologic Systems Analysis,LLC in cooperation with HHI for the Crystal River and West Sopris Creek areas (CRWS; Kobnand others, 2008); the Middle Roaring Fork area (MRF; Kobn and Gilson, 2004), the Upper andMiddle Roaring Fork areas (URF/MRF; Kolni and van der Heijde, 2006), and for the Snowmassand Capitol Creek areas (CSC; Kobn and others, 2007) (see Figure 1 for location).

The project consists of four phases: 1) HESA, formulating conceptual models ofthe

groundwater systems, and developing a supporting database for the CRFT area; 2) developing acoherent and consistent county-wide hydrogeological nomenclature, updating the GIS maps ofthe MRF and URF study areas, and preparing county-wide maps and data bases of the major

hydrogeological units; 3) creating county-wide GIS maps showing aquifer presence andcharacteristics and groundwater resource sustainability and vulnerability, and production of ashort outreach document describing the past and current GIS-based groundwater resourcesevaluation studies; and 4) presenting findings to the Board of Pitkin County Commissioners andstaff and to the public.

This report presents the results of phase 2 of this project (developing county-widehydrogeological and hydrological GIS maps) and includes: 1) developing a coherent andconsistent county-wide hydrogeological nomenclature; 2) updating the hydrogeological GISlayers and data bases of the MRF and URF study areas; 3) completing the hydrogeological GISmapping of unmapped sections between previous study areas (indicated by the dark grey area inFigure 1); 4) modifying the structure of the GIS data bases of the URF/MRF, CSC, and CRWSstudy areas to make them compatible with the data bases for the CRFT area; and 5) preparingcounty-wide GIS maps and data bases of the major hydrogeological units. This report alsoincludes a description of updated auxiliary hydrological GIS data bases for use with the

groundwater resources evaluation procedure developed in previous projects (Kobn and others,2008).

County-wide Hydrogeological and Hydrological GIS layers Integral Consulting Inc. c 5/24

D CRFT Study Area (2011)L ~ CRWS Study Area (2008)

D CSC Study Area (2007)D Middle RF Study Area (20061C.: Upper RF Study Area (2006)

N

_\,-01234Milesiiiiiii11

Figure 1. Location of the Central Roaring Fork Tributaries (CRFT), Crystal River and West Sopris Creek(CRWS), Capitol and Snowmass Creek (CSC), Middle Roaring Fork (MRF), and Upper Roaring Fork (URF)

Study Areas, Pitkin County, Colorado.

2.0 Developing a Coherent and Consistent Hydrogeological Nomenclature

The complex hydrogeological framework present in Pitkin County has been described inprevious reports (Kobn and Gilson, 2004; Kobn and Van der Heijde, 2006; Kobn and others,2007; Kobn and others, 2008; Kolni and Van der Heijde, 2011). The hydrological systems inPitkin County have multiple, distinct hydrogeological and hydro structural units, includingunconsolidated units consisting of various tertiary- and quaternary-aged highly permeabledeposits, multiple water-bearing and confining bedrock units, and highly transmissive fault andfracture zones. To detennine the relevant hydrogeological and hydro structural units in PitkinCounty, HESA is applied to various parts ofthe County, integrating elements of climate,topography, geomorphology, groundwater and surface water hydrology, and geology (amongothers) (Ko111 and Van der Hëijde, 2006; KOl11 and others, 2007; Kolni and others, 2008; Kolmand Van der Heijde, 2011). An integral part ofthese HESAs and the subsequent mapping ofhydrogeological units is the evaluation of the geology as represented by various geologic maps.

. These maps have different authors, are developed by different agencies, and are published atdifferent times, resulting in inconsistent geological insights and termology. Therefore,additional evaluation and interpretation, guided by HESA, was required to incorporate thesegeological maps into the development ofthe current hydrogeological GIS maps.

Identification ofthe geological units present in Pitkin County is primarily based ongeological maps published by the U.S. Geological Survey and the Colorado Geological Surveyon scales 1 :24,000 and 1 :250,000 (Biyant, 1969 (Maroon Bells), 1970 (Hayden Peak), 1971(Aspen), 1972a (Highland Peak); Freeman, 1972a (Ruedi Reservoir), 1972b (Woody Creek);Gaskill and others, 1991 (Gothic); Gaskil and Godwin, 1966 (Marble); Godwin, 1968 (ChairMountain); Mutschler, 1970 (Snowmass Mountain); Streufert and others, 1998 (Basalt);Streufert, 1999 (Mount Sopris); and Tweto and others, 1976 (Montrose 1°x2°),


1978 (Leadville lOx2°J). The coverage provided by these geological maps is shown in Figure 2.The geological units present in these maps are grouped together based on their hydrogeologicalcharacteristics using the results of the HESA process. Each group is assigned a hydrogeologicalname that is related to the most common geological unit in that group. In addition, analphanumeric symbol is assigned to each of these hydrogeological units for the purpose of GISmapping. The results of this procedure are presented in Table 1 which also includes a shortdescription of the composition and hydrogeological characteristics of

the hydrogeological units.

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coverage by the 1°x2° Geologic Quadrangle Maps (Scale 1:200,000); published by USGS.


Geo

logi

cal U

nit

Hyd

roge

olog

ical

Uni

tH

ydro

geol

ogic

alC

ompo

sitio

nH

ydro

geol

ogic

al C

hara

cter

istic

s(f

rom

US

GS

and

CG

S q

uads

and

Uni

t Sym

bol

Lea

dvile

1x2°

map

) *

Allu

vium

(O

a); S

trea

m c

hann

el,

Mod

ern

allu

vium

Oal

Poo

rly s

orte

d riv

erin

e gr

avel

,G

ener

ally

goo

d lo

cal p

hrea

tic a

quife

r w

ithflo

odpl

ain

and

low

terr

ace

sand

, and

silt

dep

osite

d m

ainl

ym

atrix

-bas

ed p

erm

eabi

lity;

lim

ited

depo

sits

(Q

a); Y

oung

er a

lluvi

alin

str

eam

cha

nnel

s an

dva

riatio

ns in

gro

undw

ater

leve

ls; o

ften

depo

sits

(Q

y); A

lluvi

um (

Oal

);fl

oodp

lain

s in

maj

or s

trea

msu

stai

ned

by lo

cal a

nd s

ub-r

egio

nal

Older alluvium (Qalo)

valle

y bo

ttom

s; m

oder

atel

y to

disc

harg

e to

adj

acen

t str

eam

or

dire

ctly

by

wel

l-be

dded

dep

osits

stre

am.

Hig

h le

vel a

lluvi

um (

OT

a); G

rave

lsO

uate

rnar

y gr

avel

s,O

gfP

oorly

sor

ted

sand

s an

dP

oten

tially

goo

d, s

patia

lly c

ontin

uous

(Og,

Oga

, Ogb

, Ogc

, Ogd

);fa

ns a

nd te

rrac

esgr

avel

s; p

ebbl

es a

nd c

obbl

esph

reat

ic a

quife

r w

ith h

igh

mat

rix-b

ased

(Old

er)

allu

vial

s fa

n de

posi

ts (

Qf,

in s

and

to s

ilt m

atrix

; for

ms

perm

eabi

lity

and

smal

l wat

er ta

ble

Qof

, Qfi,

Qfo

, Ofa

, Qfb

); T

erra

cete

rrac

es a

bove

cur

rent

Roa

ring

grad

ient

s; s

usta

inab

ility

dep

ends

on

loca

lgr

avel

dep

osits

(Q

te, Q

ty, Q

tm,

For

k R

iver

leve

lna

tura

l and

/or

anth

ropo

geni

c re

char

geQ

to, Q

tg);

Loc

al o

rigin

gra

vels

mec

hani

sms;

may

be

supp

orte

d by

(Qgl

)un

derly

ing

bedr

ock;

may

be

pron

e to

sign

ifica

nt (

seas

onal

) w

ater

tabl

efl

uctu

atio

ns.

Gla

cial

drif

t, til

l (Q

d, O

do, O

ti);

Oua

tern

ary

glac

ial

Qm

Het

erog

eneo

us, p

oorly

sor

ted

Pot

entia

lly g

ood

loca

l phr

eatic

aqu

ifer

with

Gla

ciof

luvi

al d

epos

its (

Qga

, Qgb

,de

posi

tsde

posi

ts o

f bou

lder

s, g

rave

l,va

riabl

e m

atrix

-bas

ed p

erm

eabi

lity

and

Qgc

, Qgd

); M

orai

nal d

epos

itssa

nd, s

ilt, a

nd c

lay

high

wat

er ta

ble

grad

ient

s; s

usta

inab

ility

(Qm

); G

laci

al d

epos

its (

Om

a,de

pend

s on

loca

l nat

ural

and

/or

Qmb, Qmbc, Qmc, Qmd, Qme);

anth

ropo

geni

c re

char

ge m

echa

nism

s;(O

ld)

rock

gla

cier

(Q

r, O

or, O

rg);

may

be

pron

e to

sig

nific

ant w

ater

tabl

eQ

uart

erna

ry d

epos

itsfl

uctu

atio

ns.

undi

ffere

ntia

ted

(Qu)

Tal

us (

Qt)

; Lan

dslid

e de

posi

ts (

QI,

Qua

tern

ary

collu

vium

Ols

Loos

e gr

avel

s an

d ro

ck d

ebris

Pot

entia

lly g

ood,

hig

hly

loca

lized

phr

eatic

Ols

); C

ollu

vium

(O

c, O

co);

and

land

slid

e de

posi

tsw

ith m

ixed

mat

rix

com

posi

tion

aqui

fer

with

hig

h m

atri

x-ba

sed

Hill

slop

e sh

eetw

ash

depo

sits

(O

h,(s

and-

clay

) on

val

ley

side

s,pe

rmea

bilit

y an

d hi

gh w

ater

tabl

eO

sw);

Deb

ris fl

ows

(Odf

);va

lley

floor

s an

d hi

llslo

pes;

grad

ient

s; s

usta

inab

ility

dep

ends

on

loca

lS

olifl

uctio

n de

posi

ts (

Os)

depo

site

d by

gra

vita

tiona

lna

tura

l and

/or

anth

ropo

geni

c re

char

gepr

oces

ses

mec

hani

sms

and

may

be

depe

nden

t on

unde

rlyin

g be

droc

k ch

arac

teris

tics;

may

be p

rone

to s

igni

fican

t (se

ason

al)

wat

ertable fluctuations.

Tab

le 1

. Cor

rela

tion

of G

eolo

gica

l and

Hyd

roge

olog

ical

Uni

ts in

Pitk

in C

ount

y an

d th

eir

Com

posi

tion

and

Hyd

roge

olog

ical

Cha

ract

eris

tics.

Cou

nty-

wid

e H

ydro

geol

ogic

al a

nd H

ydro

logi

cal G

IS la

ycrs

Inte

gral

Con

sulti

ng I

nc. -

9/2

4

Geo

logi

cal U

nit

Hyd

roge

olog

ical

Uni

tH

ydro

geol

ogic

alC

ompo

sitio

nH

ydro

geol

ogic

al C

hara

cter

istic

s(f

rom

US

GS

and

CG

S q

uads

and

Uni

t Sym

bol

Lea

dvile

1x2°

map

) *

Old

/Old

er g

rave

ls (

Oog

, Ogo

);O

lder

rid

ge to

p sa

nds

Oog

Poo

rly s

orte

d sa

nds

and

Alth

ough

hav

ing

high

mat

rix-

base

dT

ertia

ry (

unco

nsol

idat

ed)

and

grav

els

grav

els;

peb

bles

and

cob

bles

perm

eabi

lity,

loca

tion

in to

pogr

aphy

sedi

men

ts o

n rid

ges

and

high

erin

san

d to

silt

mat

rixpr

eclu

des

any

sign

ifica

nt g

roun

dwat

erelevations of slopes (Ts) - also

pres

ence

.se

e T

s fo

r ba

sin

fill

Sed

imen

tary

dep

osits

(T

s) in

Ter

tiary

sed

imen

tary

Ts

Wea

kly

indu

rate

d to

In th

e ba

sins

and

val

leys

nea

r th

e no

rth-

basi

nsba

sin

fil d

epos

itsun

cons

olid

ated

fluv

ial d

epos

itsce

ntra

l bou

ndar

y of

cou

nty

it is

a g

ood

(peb

bles

and

cob

bles

in a

cont

inuo

us, v

ery

thic

k aq

uife

r w

ith h

igh

mat

rix o

f silt

y sa

nd)

fillin

g th

em

atrix

-bas

ed p

erm

eabi

lity;

reg

iona

llyC

arbo

ndal

e C

olla

pse

sust

aine

d by

dire

ct r

echa

rge

and

rech

arge

subs

iden

ce f

eatu

re a

ndth

roug

h ad

jace

nt b

edro

ck; s

igni

fican

tpr

esen

t in

som

e ad

jace

ntsu

breg

iona

l flo

w e

xitin

g P

itkin

Cou

nty

toar

eas

the North.

Ash

-flo

w tu

ffs (

Taf

, Tsf

); B

asal

tT

ertia

ry a

sh-f

low

tuffs

Taf

Mas

sive

, fra

ctur

ed, b

edde

d,P

oten

tially

goo

d lo

cal b

edro

ck a

quife

r w

ith(O

b, T

b)an

d ba

salts

wel

l-cem

ente

d, n

on-w

elde

dfr

actu

re-b

ased

per

mea

bilit

y; s

usta

inab

ility

ash-

flow

tuffs

; som

e th

ick,

depe

nds

on e

leva

tion

and

loca

l rec

harg

eve

sicu

lar,

loca

lly d

ense

bas

alt

mec

hani

sms.

Intr

usiv

e ro

cks

(Tm

i, T

Ki);

Mou

ntT

ertia

ry in

trus

ive

rock

sT

mi

Gra

nodi

orite

and

qua

rtz

Fra

ctur

ed c

ryst

allin

e sy

stem

with

ver

y lo

wS

opris

Gra

nodi

orite

(T

gs),

mon

zoni

te; m

ay o

ccur

as

dike

sm

atrix

per

mea

bilit

y; n

ot a

(su

b-)r

egio

nal

(Hor

nble

nde)

Gra

nodi

orite

(T

g),

and

sills

aqui

fer;

may

pro

duce

loca

lly w

ater

inan

d P

horp

hyrit

ic G

rano

dior

iteco

ncen

trat

ed fr

actu

re z

ones

and

sup

port

(Tgp

); a

lso

TK

d, T

Kq,

TK

a, T

Kap

adja

cent

Oua

rter

nary

aqu

ifers

. The

sech

arac

teris

tics

may

ext

end

into

adj

acen

tro

cks

met

amor

phos

ed d

urin

g th

e T

ertia

ryin

trus

ion.

Was

atch

and

Ohi

o C

reek

Was

atch

and

Ohi

oT

wo

Cha

nnel

san

dsto

nes

and

Ove

rban

k sa

ndst

ones

form

a g

ood

aqui

fer

form

atio

ns (

Tw

o)C

reek

form

atio

nsov

erba

nk s

iltst

ones

and

syst

em w

ith m

oder

ate

to g

ood

mat

rix-

and

shal

es; c

ongl

omer

ate;

frac

ture

-bas

ed p

erm

eabi

lity;

may

be

aca

rbon

aceo

us s

hale

s an

dlo

cally

goo

d w

ater

pro

duce

r; s

iltst

ones

ligni

te n

ear

base

and

shal

es a

re c

onfin

ing

laye

rs; a

quife

rsar

e su

stai

nabl

e at

mod

erat

e el

evat

ions

inw

este

rn p

art o

f cou

nty;

out

crop

s ar

ere

char

ge a

reas

for

a re

gion

al fl

ow to

the

wes

t acr

oss

coun

ty b

orde

r.

Tab

le i

cont

inue

d. C

orre

latio

n of

Geo

logi

cal a

nd H

ydro

geol

ogic

al U

nits

in P

itkin

Cou

nty

and

thei

r C

ompo

sitio

n an

d H

ydro

geol

ogic

al C

hara

cter

istic

s.

Cou

nty-

wid

c H

ydro

gcol

ogic

aI a

nd H

ydro

logi

cal G

IS la

ycrs

Intc

gral

Con

sulti

ng I

nc. -

10/

24

Geo

logi

cal U

nit

Hyd

roge

olog

ical

Uni

tH

ydro

geol

ogic

alC

ompo

sitio

nH

ydro

geol

ogic

al C

hara

cter

istic

s

(fro

m U

SG

S a

nd C

GS

qua

ds a

ndU

nit S

ymbo

lL

eadv

ille

1x2°

map

) *

Mes

a V

erde

Gro

up o

r F

orm

atio

nM

esa

Ver

de G

roup

Km

vIn

terb

edde

d sa

ndst

ones

and

Goo

d re

gion

al b

edro

ck a

quif

er s

yste

m;

(Kmv, Kmvu, Kmvl)

silts

tone

s, s

hale

s an

dsa

ndst

ones

and

coa

ls h

ave

both

carb

onac

eous

sha

les,

and

mod

erat

e m

atrix

- an

d fr

actu

re-b

ased

coal

spe

rmea

bilit

y; m

ay lo

cally

be

a go

od w

ater

prod

ucer

; sh

ales

are

con

finin

g la

yers

;re

gion

ally

sus

tain

able

aqu

ifer

at m

oder

ate

elev

atio

ns in

wes

tern

par

t of c

ount

y;ou

tcro

ps a

re r

echa

rge

area

s fo

r re

gion

alflo

w to

the

wes

t acr

oss

coun

tv b

orde

r,

Man

cos

Sha

le (

Km

, Km

u)M

anco

s Sh

ale

Km

Silt

y to

san

dy s

hale

with

Mos

tly a

quita

rd w

ith v

ery

low

per

mea

bilit

y

(und

ivid

ed)

bent

onite

s w

ith m

inor

serv

ing

as a

con

finin

g la

yer

for

unde

rlyin

glim

esto

ne a

nd s

ands

tone

bed

s;or

em

bedd

ed a

quife

rs; h

owev

er, l

ocal

lyw

hen

undi

vide

d, lo

wer

sec

tion

mod

erat

e aq

uife

r co

nditi

ons

whe

n hi

ghly

incl

udes

Ft H

ays

limes

tone

frac

ture

d or

in a

reas

with

san

d le

nses

and

(see separate section below)

sand

y be

ds; s

usta

inab

ility

hig

hly

depe

nden

t on

loca

l rec

harg

em

echa

nism

s.U

pper

and

Low

er S

ands

tone

Man

cos

Sha

le -

Km

sO

utcr

ops

of lo

cal o

rLo

cally

mod

erat

e aq

uife

r co

nditi

ons;

Mem

bers

of M

anco

s S

hale

(K

ms,

San

dsto

ne m

embe

rsdi

scon

tinuo

us s

ands

tone

bed

ssu

stai

nabi

lty h

ighl

y de

pend

ent o

n lo

cal

Km

sl)

in U

pper

Man

cos

Sha

le u

nit

rech

arge

mec

hani

sms.

For

t Hay

s Li

mes

tone

Mem

ber

ofM

anco

s S

hale

- F

ort

Km

fT

hick

-bed

ded

coar

se-g

rain

edG

ood

loca

l or

regi

onal

frac

ture

d-flo

wM

anco

s S

hale

(K

mf)

Hays Limestone

limes

tone

aqui

fer;

how

ever

, gen

eral

ly c

over

ed b

ym

embe

rm

any

hund

reds

of f

eet o

f sha

le e

xcep

tne

ar o

utcr

ops;

out

crop

s ar

e re

char

gear

eas

for

a re

gion

al fl

ow to

the

wes

tac

ross

cou

nty

bord

er; (

sub-

)re

gion

ally

sust

aina

ble

aqui

fer.

Low

er M

anco

s S

hale

, inc

ludi

ngM

anco

s S

hale

- L

ower

Km

lS

ilty

shal

e w

ith s

ands

tone

Mos

tly v

ery

low

per

mea

bilit

y aq

uita

rd;

Fro

ntie

r S

ands

tone

and

Mow

ryS

hale

uni

tbe

dsho

wev

er, l

ocal

ly m

oder

ate

aqui

fer

Sha

le m

embe

rs (

Km

l)co

nditi

ons

whe

n hi

ghly

frac

ture

d or

inar

eas

with

san

d le

nses

and

san

dy b

eds;

sust

aina

bilty

hig

hly

depe

nden

t on

loca

lre

char

ge m

echa

nism

s.

Tab

le 1

con

tinue

d. C

orre

latio

n of

Geo

logi

cal a

nd H

ydro

geol

ogic

al U

nits

in P

itkin

Cou

nty

and

thei

r C

ompo

sito

n an

d H

ydro

geol

ogic

al C

hara

cter

istic

s.

Cou

nty-

wid

e H

ydro

geol

ogic

al a

nd H

ydro

logi

cal G

IS la

yers

Integral Consulting Inc. - 11124

Geo

logi

cal U

nit

Hyd

roge

olog

ical

Uni

tH

ydro

geol

ogic

alC

ompo

sitio

nH

ydro

geol

ogic

al C

hara

cter

istic

s(f

rom

US

GS

and

CG

S q

uads

and

Uni

t Sym

bol

Lea

dvile

1x2°

map

) *

Dak

ota

San

dsto

ne (

Kd)

, Dak

ota

Dakota Sandstone and

Kdb

Wel

l ind

urat

ed, m

ediu

m-

toG

ood

regi

onal

bed

rock

aqu

ifer

sys

tem

;S

ands

tone

and

Bur

ro C

anyo

nB

urro

Can

yon

coar

se-g

rain

ed q

uart

zose

sand

ston

es h

ave

both

mod

erat

e m

atrix

-F

orm

atio

n (K

db);

Low

er M

anco

sFo

rmat

ion

sand

ston

es in

wel

l-cem

ente

dand fracture-based permeabilty; sub-

Sha

le (

Fro

ntie

r S

ands

tone

) an

dth

ick

beds

and

con

glom

erat

ere

gion

ally

sus

tain

able

aqu

ifer

with

Dak

ota

San

dsto

ne (

Kfd

)w

ith o

ccas

iona

l silt

ston

es a

ndre

char

ge in

out

crop

are

as; m

ostly

carb

onac

eous

sha

lepr

otec

ted

by o

verly

ing

Man

cos

Sha

leex

cept

for

outc

rop

area

s.M

orris

on F

orm

atio

n an

d E

ntra

daM

orris

on a

nd E

ntra

daJm

eM

orri

son

Form

. (Jm

):E

ntra

da is

a v

ery

good

, reg

iona

llyF

orm

atio

ns u

ndiv

ided

(Jm

e);

Form

atio

nsSi

ltsto

nes

and

clay

ston

essu

stai

nabl

e aq

uife

r w

ith m

oder

ate

to g

ood

Dak

ota,

Mor

rison

and

Ent

rada

thro

ugho

ut w

ith s

ands

tone

sm

atrix

- an

d fr

actu

re-b

ased

per

mea

bilit

y.F

orm

atio

ns -

und

ivid

ed (

KJd

e);

beco

min

g m

ore

com

mon

inM

orris

on s

hale

s ar

e co

nfin

ing

laye

rs w

hile

Mor

rison

, Ent

rada

and

Chi

nle

low

er s

ectio

ns, a

nd li

mes

tone

the

low

er M

orris

on s

ands

tone

s an

dF

orm

atio

ns (

JTrm

c)ne

ar b

ase;

Ent

rada

For

m. (

Je):

limes

tone

may

ser

ve a

s lo

cal t

o su

b-fin

e-gr

aine

d, w

ell-s

orte

dre

gion

al a

quife

rs w

ith s

usta

inab

ility

sand

ston

es; J

e is

ove

rlain

by

depe

nden

t on

loca

l rec

harg

e co

nditi

ons.

JmC

hinl

e F

orm

atio

n (T

Rc)

, Sta

teC

hinl

e an

d S

tate

TrP

csT

hin

even

bed

ded

red

beds

of

The

Chi

nle

For

mat

ion

is a

ver

y lo

wB

ridge

For

mat

ion

(TrP

s), C

hinl

eB

ridg

e Fo

rmat

ions

calc

areo

us s

iltst

one

and

perm

eabi

lity

aqui

tard

and

con

stiu

tes

aan

d S

tate

Brid

ge F

orm

atio

nsmudstone becoming sandy

maj

or r

egio

nal c

onfin

ing

laye

r w

ith r

espe

ctun

divi

ded

(TrP

cs)

near

bas

e (C

hinl

e)to

und

erly

ing

aqui

fers

. Loc

al s

ands

tone

unco

nfor

mily

on

top

ofun

its in

the

Chi

nle

and

Sta

te B

ridge

inte

rbed

ded

silts

tone

and

For

mat

ion

near

out

crop

s m

ay p

rovi

de a

sand

ston

e be

com

ing

mor

elo

cal w

ater

sou

rce.

clay

ey to

war

d th

e ba

se (

Sta

teB

ridg

e)M

aroo

n F

orm

atio

n (P

Pm

), M

aroo

nM

aroo

n an

d M

intu

rnPP

mm

Inte

rbed

ded

arko

sic

Arc

osic

san

dsto

nes,

con

glom

erat

e an

dF

orm

atio

n an

d W

eber

San

dsto

neFo

rmat

ions

sand

~on

es, s

i~, a

ndlim

esto

nes

form

a ti

ght b

edro

ck a

quife

r(P

Pw

m),

Min

turn

For

mat

ion

(Pm

),mudstones, and

with

prim

arily

frac

ture

-bas

ed p

erm

eabi

lity;

Got

hic

Form

atio

n (P

g)co

nglo

mer

ates

(M

aroo

n);

is a

n aq

uife

r w

here

met

amor

phos

ed a

ndin

terb

edde

d sh

ale,

silt

ston

e,w

ell c

emen

ted.

At t

he lo

cal s

cale

, fra

ctur

esa

ndst

one,

lim

esto

ne, a

ndzo

nes

may

pro

vide

goo

d aq

uife

rco

nglo

mer

ate

(Min

turn

/Got

hic)

cond

ition

s. M

ay s

usta

in a

djac

ent o

rov

erly

ing

Qua

rter

nary

aqu

ifers

.

Tab

le 1

con

tinuc

d. C

orre

latio

n of

Geo

logi

cal a

nd H

ydro

geol

ogic

al U

nits

in l'

ilkin

Cou

nty

and

thei

r C

ompo

sitio

n an

d H

ydro

geol

ogic

al C

hara

cter

istic

s.

Cou

nty-

wid

c H

ydro

gcoI

ogic

aI a

nd H

ydro

logi

cal G

IS la

ycrs

Intc

gral

Con

sulti

ng I

nc. -

12/

24

Geo

logi

cal U

nit

Hyd

roge

olog

ical

Uni

tH

ydro

geol

ogic

alC

ompo

sitio

nH

ydro

geol

ogic

al C

hara

cter

istic

s(f

rom

US

GS

and

CG

S q

uads

and

Uni

t Sym

bol

Lea

dvile

1x2°

map

) *

Eag

le V

alle

y Fo

rmat

ion

(Pe)

,E

agle

Val

ley

PeTan, reddish brown, reddish

Gen

eral

ly p

oor

aqui

fer

exce

pt w

here

loca

lE

agle

Val

ley

Eva

pori

te (

Pee)

Formation and Eagle

grey

sils

tone

, gyp

sum

and

kars

t and

/or

exte

nsiv

e fr

actu

ring

have

Val

ley

Eva

pori

teca

rbon

ate

rock

s, E

vapo

rite

deve

lope

d.co

ntai

ns a

nhyd

rite,

hal

ite,

gyps

um, a

nd li

ght c

olor

edm

udst

one.

May

hav

e in

trud

edin

hig

her

form

atio

ns.

Bel

den

For

mat

ion

(Pb)

Bel

den

For

mat

ion

PbS

hale

s in

terb

edde

d w

ithM

ostly

a v

ery

low

per

mea

bilit

y aq

uita

rd;

limes

tone

and

dol

omite

and

may

act

as

the

conf

inin

g un

it fo

rso

me

sand

ston

eun

derl

ying

Lea

dvile

Lim

esto

ne.

Mis

siss

ippi

an, D

evon

ian,

Lea

dvill

e L

imes

tone

MI

Thi

ck-b

edde

d m

assi

veS

igni

fican

t reg

iona

l, fr

actu

red

perm

eabi

lity

Ord

ovic

ian,

and

Cam

bria

n R

ocks

limes

tone

in u

pper

par

t; th

in-

toaq

uife

r w

ith lo

cal k

arst

; loc

al a

quife

r(M

Cr)

incl

udin

g M

issi

ssip

pian

thic

k-be

dded

dol

omite

in lo

wer

cond

ition

s in

frac

ture

d G

ilman

San

dsto

ne;

Lead

ville

Lim

esto

nepa

rt; G

ilman

San

dsto

nepr

esen

ce o

f ext

ensi

ve m

inin

g tu

nnel

s ne

arm

embe

r at

the

base

(do

lom

itic

outc

rops

pro

vide

sig

nific

ant a

dditi

onal

sand

ston

e to

san

dy d

olom

ite)

fracture-zone-like permeability;

inte

rcon

nect

ed a

nd s

catte

red

nonc

onne

cted

min

ewor

king

tunn

els

are

pres

ent i

n th

e vc

inity

of t

he L

eadv

ille

outc

rops

.Pr

ecam

bria

n G

rani

tes

and

Pre

cam

bria

n G

rani

tes

YX

gG

rani

tes

and

gnei

sses

Fra

ctur

ed c

ryst

allin

e sy

stem

with

ver

y lo

wG

neis

ses

(Xb,

Xfh

, Xg,

Xgl

, Xh,

and

Gne

isse

smatrix permeability; not a (sub-)regional

Yg, pCr)

aqui

fer;

may

pro

duce

loca

lly w

ater

inco

ncen

trat

ed fr

actu

re z

ones

and

sup

port

adja

cent

Qua

rter

nary

aqu

ifers

.

Tab

le 1

con

tinue

d. C

orre

latio

n of

Geo

logi

cal a

nd H

ydro

geol

ogic

al U

nits

in P

itkin

Cou

nty

and

thei

r C

ompo

sitio

n an

d H

ydro

geol

ogic

al C

hara

cter

istic

s

Cou

nty-

wid

e H

ydro

geol

ogic

al a

nd H

ydro

logi

cal G

IS I

aycr

sIn

tegr

al C

onsu

lting

Inc

. - 1

3/24

3.0 Development of County-wide Hydrogeological GIS Data Bases

The development of the county-wide hydrogeological GIS layers consisted of four steps:

1. Digitizing geological maps and creating hydrogeological GIS layers for the URF studyarea.

2. Completing the hydrogeological mapping of unmapped sections between previous studyareas as shown in Figure 1.

3. Modifying the structure of the hydrogeological GIS data bases produced as part oftheMRF, CSC, and CRWS studies in preparation ofthe construction ofa single county-wideset of hydrogeological data bases.

4. Preparing county-wide GIS layers and data bases of the major hydrogeological units.

These county-wide GIS layers are used in phase 3 ofthe project to create maps of availability,sustainability, and susceptibility (or vulnerability) ofthe groundwater resources in Pitkin County.

3.1 Digitizing Geological Maps and Creating Hydrogeological GIS Data Bases for the URF

Study Area

As a follow up of hydrogeological studies of the MRF and URF watersheds in Pitkin Countyperformed in the early 2000s, a project was proposed to combine the resulting GIS data baseswith an innovative, step-by-step groundwater resources evaluation procedure focused on thedevelopable lands in the MRF and URF watersheds (Kolm and Van der Heijde, 2006). Theoriginal GIS data bases for the MRF and URF areas were created using early versions ofIntergraph's GeoMedia and related software. Because Pitkin County's GIS is based on ESRI'sARC/INFO software, these original data bases had to be transferred and reformatted. Whileobtaining the original GIS data bases, it was found that the GIS data set for the URF area was nolonger available. Furthermore, the county detennined that the new project should focus on theareas of the MRF and URF watersheds outside the City of Aspen because of the hydrogeologicalcomplexities in the Aspen area. As a result, the 2006 study produced ARC/INFO-compatiblehydrogeological layers for the MRF area (between Aspen and Basalt) only (Kahn and Van derHeijde, 2006).

In preparation of the development of the county-wide set of hydrogeological GIS layers, thehydrogeological layers for the URF area needed to be created using digitized geological mapstogether with the results of an HE SA. The geological maps used include the Aspen 7.5-minutequadrangle (Biyant, 1971), the Hayden Peak 7.5-ininute quadrangle (Biyant, 1970), and theLeadville 1 x2° quadrangle (Tweto and others, 1978). An earlier study of the URF watershedincluded a Watershed System Analysis (Kobn and others, 2000), that served as the HESA for theURF area in the current project. The resulting GIS map of the hydrogeological layers is

presented in Figure 3.


CQalQgf

i: Qls

DQmt~ TslQog

_TSCTal_TmiC! Two

Kmv

_KmII Kmu_Kmi_Kdb_Jme_ JTRmc_ TrPes

_ PPmm_Pb

Pe

_MICI YXg

N

+2 3 MilesI i

Figure 3. Hydrogeological Units of the Upper Roaring Fork (UR) Study Area, Pitkin County, Colorado.

3.2 Completing the Hydrogeological Mapping of Unmapped Sections between Previous

Study Areas

The earlier hydrogeological studies in the MRF area were focused on the terraces and valleybottom along the Roaring Fork River and the lower sections of Owl and Brush Creek (Kolm andGilson, 2004; Kolm and Van der Heijde, 2006). The later studies regarding the hydrogeology ofCapitol, Snowmass and Sopris Creeks, and the Crystal River covered the entire watersheds. Theresulting GIS mapping shows gaps between the Roaring Fork River and Sopris and SnowmassCreeks, as well as in the upper parts of the Owl and Brush Creek watersheds (incidated by thegrey-colored area in Figure 1). To address these gaps, available geological maps were digitized

and evaluated in the context of the HESAs perfonned for the neighboring areas (Kahn and Vander Heijde, 2006 (MRF): Kobn and others, 2007 (CSCJ: Kolm and others, 2008 (CRWSJ). Theresulting GIS map of the hydrogeological layers in these gaps are shown in Figure 4.


Kmv

"'fti&"e~\ç.t\

í--I -~

¿

')- _~ -r.: N

+i Qal

Qgf

LoisDami: Ts/Oog_TS~Taf_Tmii: Two

~:ìil.", J~c i""--.l /,_/Collin.! Creel--

_Kmc: Kmu

IIKml_Kdb_Jme_ JTRmc_ TrPcs

_ PPmm.Pb

Pe(~

I(j6 .'ll... ..'¡~ ://,".. t'l11_..~_ ,ý1~i

I

r~l9$?; ~'",

_MI. t....J YXg

ai

3 4 5 Milesi I i

Figure 4. Hydrogeological Units in Mapping Gaps Between Previous Studies.

3.3 Modifing the Structure of the Hydrogeological GIS Data Bases Produced in the MRF,CSC, and CRWS Studies

The GIS data bases developed in previous projects were designed without consideration oflater integration into a single set of data bases. As a result, each ofthese data bases had differenttypes of data fields with different field names and different field properties. In preparing tocreate a single, county-wide data bases, the existing data bases had to be modified to conformwith the data base structure implemented in the current CRFT project. Data base fields werereplaced while retaining the actual field contents by editing the attribute tables of relevant GISlayers. The resulting set of fields, including fields that will be used in phase 3 ofthe CRFTproject, are shown in Table 2.

Field Name Field Type Field Length Alias

Unit Name String 50 Hydrogeological Unit

Hydro Unit String 15 Hydro Unit Short Name

Aquif Type String 100 Aquifer Type

Aquif Sust String 50 Aquifer Sustainability

Aquif Vuln String 50 Aquifer Vulnerability

Table 2. Hydrogeological GIS Data Base Structure - Field Definitions.


3.4 Creating County-lVide GIS Layers and Data Basesfor the Major Hydrogeological Units

The final step in producing county-wide GIS layers and data bases of the hydrogeologicalunits was joining the data bases for each study area into a single, coherent set of data bases. Thisresulted in two county-wide data bases: quaternary hydrogeological units and bedrockhydrogeological units. Separately, a third hydrogeological data base was developed containinginformation on hydrogeological structures. These three data bases contain the information thatcan be displayed in GIS maps through inclusion of specific GIS layers lined to these data bases(see Figures 5, 6, and 7 for the resulting GIS layers.

Qal - Modern Alluvium

Ogf - Gravels. Fans and Terraces

i: QIs - Colluvium and Landsli:;e Depositsam - Glacial Deposits

L-i 009. Older Ridge Top Sands and Gravels

D Om,IQls - Glacial Deposits or Landslide Deposits

N

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Figure 5. County-wide GIS Layer of Quaternary Hydrogeological Units.

County-wide Hydrogeological and Hydrological GIS layers Integrl Consulting Inc. - 18/24

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3.5 County-wide GIS Mapfor Use in Conjunction .vith the Groundwater ResourcesEvaluation Procedure

The county-wide GIS map, GIS layers, and GIS data bases were prepared using ArcGIS™(ESRi(j, Redlands, California), and require ArcGIS version 8.3 or higher. The GIS map consistsof a number oflayers representing various types of information that is relevant to the assessmentof the groundwater resources at user-specified locations as described in previous project reports(Figure 8). Each layer is linked to a specific data set. Some of the data sets were prepared byIntegral specifically for this project, and other data sets were obtained from public sources andwere, in some cases, modified for use in the current project.

The GIS map consists ofa table of contents (TOC; the left display area of Figure 8) and amap display area (the right display area of Figure 8). The TOC lists the county-widehydrogeological, hydrological, and anthropogenic layers developed in Phase 2 of the currentproject. When applying the groundwater resources evaluation procedure to site-specific planningor landuse management issues, these layers should be used together with general geographic,topographic, and land-use layers, as described in Kolm and others (2008). All layers have beengeoreferenced with respect to Pitkin County's projection and datum: State Plane, ColoradoCentral Zone, NAD83 (units of measure in feet).

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Each line in the TOC is a GIS layer representing a set of features of the same type, such asstreams, irigated acreage, hydrogeological units, and wells. By selecting a check box in the

TOC, elements of the activated layer become visible in the map display area. A layer mayconsist of point values (e.g., wells), line features (e.g., streams, ditches), and area features (e.g.,hydrogeologic units). Right-clicking a layer and selecting Open Attribute Table, providesadditional information on the layer, such as the names of particular features.

The map is designed to show relevant labels (text) that are based on the contents of one ofthe fields in the attribute table, such as stream name or well number. When zooming in on aparticular area of the map, additional information ofa selected layer can be displayed byactivating the Label feature.

1. Right-click the desired layer and select LabeL.

2. Right-click the layer, select Properties.

3. Click the Label tab.

4. Select th~ appropriate field in the database table.

Database information regarding a particular feature on the map can also be obtained by:

1. Click the identify option (16) on the Tools toolbar

2. Click the feature of interest. The Identify Results window appears.

3. Select the appropriate layer.

The county-wide GIS map calls up various files from the PCGW _database subdirectory. Thissubdirectory should be in a relative path with respect to the ArcGIS GIS map project file ('mxd'extension). A detailed description of the source ofthe GIS layers can be found in Appendix 1.

4.0 References

Bryant, B. 1969. Geologic Map of the Maroon Bells Quadrangle Pitkin and Gunnison Counties,Colorado. U.S. Geological Survey, Geologic Quadrangle Map GQ-788, scale 1:24000.

Bryant, B. 1970. Geologic Map of the Hayden Peak Quadrangle, Pitkin and Gunnison Counties,Colorado. U.S. Geological Survey, Geologic Quadrangle Map GQ-863, scale 1 :24000.

Bryant, B. 1971. Geologic Map of the Aspen Quadrangle, Pitkin County, Colorado. U.S.Geological Survey, Geologic Quadrangle Map GQ-933, scale 1 :24000.

Bryant, B. 1972a. Geologic Map of the Highland Peak Quadrangle, Pitkin County, Colorado.U.S. Geological Survey, Geologic Quadrangle Map GQ-932, scale 1 :24000.

Bryant, B. 1972b. Map Showing Ground-water Potential in the Aspen Quadrangle, PitkinCounty, Colorado. U.S. Geological Survey, Miscellaneous Geologic Investigations Map 1-785-B, scale 1 :24000.

County-wide Hydrogeological and Hydrological GIS layers Integral Consulting Inc. - 2 1/24

Bryant, B. 1979. Geologic of the Aspen 15-minute Quadrangle, Pitkin and Gunnison Counties,Colorado. u.s. Geological Survey, Professional Paper 1073.

Freeman, V.L. 1972a. Geologic Map of the Ruedi Quadrangle, Pitkin and Eagle Counties,Colorado. u.s. Geological Survey, Geologic Quadrangle Map GQ-l 004, scale 1 :24000.

Freeman, V.L., 1 972b. Geologic Map of the Woody Creek Quadrangle, Pitkin and EagleCounties, Colorado. U.S. Geological Survey, Geologic Quadrangle Map GQ-967, scale 1 :24000.

Gaskill, D.L. and L.H. Godwin. 1966. Geologic Map of the Marble Quadrangle, Gunnison andPitkin Counties, Colorado. U.S. Geological Survey, Geologic Quadrangle Map GQ-512, scale1 :24000.

Gaskill, D.L., J.B. Kramer, J.A. Thomas, and S.G. Zahony. 1991. Geologic Map of the GothicQuadrangle, Gunnison County, Colorado. U.S. Geological Survey, Geologic Quadrangle MapGQ-1689, scale 1:24000.

Godwin, L.H. 1968. Geologic Map of the Chair Mountain Quadrangle, Gunnison and PitkinCounties, Colorado. U.S. Geological Survey, Geologic Quadrangle Map GQ-704, scale i :24000.

Kohn, K.E., K.C. Glover, and J.e. Emerick. 2000. Understanding Mountain Wetland Hydrology:Technical Guidance for Investigating the Hydrological Function of Wetlands in ComplexTerrain. Report prepared by Colorado School of Mines for U.S. EPA, Region VIII.

Kolm, K.E., and R.G. Gillson, II. 2004. State of Ground and SUlface Water in the CentralRoaring Fork Valley, Pitkin County, Colorado. Report prepared by HSA for Pitkin CountyCommission of County Commissioners.

Kolm, K.E., and P.K.M. van der Heijde. 2006. Development of GIS-based Ground WaterResource Evaluation of the Upper and Middle Roaring Fork Valley Area, Pitkin County,Colorado. Report prepared by HSA and HHI for Pitkin County Commission of CountyCommissioners.

Kohn, K.E., P.K.M. van der Heijde, and M. Dechesne. 2007. GIS-based Ground WaterResources Evaluation of the Capitol and Snovvniass Creek (CSC)Study Areas, Pitkin County,

Colorado. Report prepared by HSA and HHI for Pitkin County Commission of CountyCommissioners.

Kolm, K.E., P.K.M. van der Heijde, and M. Dechesne. 2008. GIS-based Ground WaterResources Evaluation of the Crystal River and West Sopris Creek (CR WS) Study Area, Pitkin

County, Colorado. Report prepared by HSA and HHI for Pitkin County Commission of CountyCommissioners.

Kobn, KE., and PKM. van der Heijde. 2011. Hydrologic and Environmental Systems Analysisand Formulation of Conceptual Modelsfor the Central Roaring Fork Tributaries (CRFT) , PitkinCounty, Colorado. Report prepared by Integral Consulting Inc. for Pitkin County Commission ofCounty Commissioners.


Mutschler, F .E. 1970. Geologic Map of the Snowmass Mountain Quadrangle, Pitkin andGunnison Counties, Colorado. U.S. Geological Survey. Geologic Quadrangle Map GQ-853,scale 1 :24000.

Streufert, R.K., B.L. Widman, and R.M. Kikham. 1998. Geologic Map of the Basalt

Quadrangle, Eagle, Garfield and Pitkin Counties, Colorado. Colorado Geological Survey. OFR98-1, scale 1 :24000.

Streufert, R.K. 1999. Geologic Map of the Mount Sopris Quadrangle, Garfield and PitkinCounties, Colorado. Colorado Geological Survey. OFR 99-7, scale 1 :24000.

Tweto, 0., T.A. Steven, W.J Hail, Jr, and R.H. Moench. 1976. PreliminalY Geologic Map of the

Montrose 1° x2° Quadrangle, South-western Colorado. U.S. Geological Survey. MiscellaneousField Studies Map MF-76 1.

Tweto, 0., R.H. Moench, and J.C. Reed, Jr. 1978. Geologic Map of the Leadvile )0 x2°Quadrangle, Colorado. U.S. Geological Survey. Miscellaneous Investigations Series Map 1-999.


Appendix 1

Data Sources

1. NRCS (US. Department of Agriculture - Natural Resources Conservation Service)

The data bases for one of the precipitation layers (isopleths) as well as for the watershedlayers of the county-wide GIS map were obtained from the NRCS Data Gateway web site. Theprecipitation data were developed using PRISM (Parameter elevation Regression on IndependentSlopes Model), which uses a rule-based combination of point measurements and a digitalelevation model (DEM) and includes consideration of topographic facets. The watershed layers

and data bases were derived from a single NRCS data base containing all watersheds that arefully or partially within Pitkin County. The NRCS data source and additional information can befound at: http://datagateway.nrcs.usda.gov/GatewayHome.html. The GIS map layer based onthis data set is referenced as 'NRCS 2010'.

2. CDWR (Colorado Division of Water Resources)

There are three data bases in the county-wide GIS map that were obtained from the ColoradoDivision of Water Resources (CDWR) web site: 1) wells (abandoned, constructed, orconstructed and augmented; as of March 2011); 2) precipitation isohyetals; and 3) irigated areasas of 1993,2000, and 2005. Layers based on these data are referenced as 'CDWR 2010' or'CDWR March 201 l. The well data source can be found athttp://ww.dwr.state.co.us/W ellPermitSearchidefault.asox (Figure AI). To search:

a. Click the Actions tab.

b. Set the search period

c. Click the (+) next to Additional Filters.

d. Select the Limit to Geographical Area check box and choose an option from the

dropdown list. More than one option may be chosen by holding down SHIFT orCNTL and clicking the selections.

e. Select the Limit to Use check box and choose an option from the dropdown list.More than one option may be chosen by holding down SHIFT or CNTL and clickingthe selections.

f. Select the Limit to Status check box and choose an option from the dropdown list.

More than one option may be chosen by holding down SHIFT or CNTL and clickingthe selections. .g. Click Search.

h. Click Export Results to save the resulting comma separated values fie to a localdrive. This file can then be opened with Microsofti! Excel and other programs.

The precipitation and irigation data sets are CDWR Division 5 subsets (Colorado RiverBasin). The irigated areas layers are based on compilations of the irigated lands data from the

four Western Slope Divisions of the CDWR. These data sets provide a single year snapshot ofthe IiTigated lands and crop types ofthe western slope of Colorado. In the GIS map, the 2005data layer lies on top of the 2000 data layer, which in turn lies on top ofthe 1993 data layer,


showing the irigated acreage taken out between 1993, 2000, and 2005. The CDWR data sourcefor irigated areas and precipitation (and other hydrologic information) can be found at:

http://water.state.co.us/DataMaps/G I SandMaps/P ages/G I SDownloads. aspx.

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Figure AI. The Colorado's Well Permit Search screen on the Colorado Division of Water Resources(CDWR) website.

3. PC (Pitkin County/City of Aspen GIS)

There five data bases obtained from the Pitkin County/City of Aspen GIS Department:1) Pitkin County boundary, 2) streams, 3) lakes and ponds, 4) ditches, and 5) mining claims. Thestreams data base has been used to create two separate layers: streams-perennial (or continuous)and streams-intermittent. Note that the ditch layer includes active and non-active ditches, as wellas primary, secondary, and tertiary ditches, but that a distinction between active and inactiveditches and the size of the ditches cannot be determined within this GIS layer. Additional fieldverification is needed to assess the hydrologic importance of individual ditches. Pitkin County'sGIS data were made available by the County as part of the project agreement. Layers based onthese data are referenced as PC 2008.


4. ICI _ HHI (lntegral Consulting Inc in cooperation with Heath Hydrology Inc.)

There are a number of data bases developed by Integral Consulting Inc in cooperation withHeath Hydrology Inc. They include two county-wide hydro-units layers (quaternaryhydrological units and bedrock hydrogeological units) as described above, a hydro-structureslayer (zones with geological structures of hydrogeologic importance), a geological faults layer, alayer showing mining areas near the town of Aspen with specific hydrogeological characteristics,and layers showing locations of towns and geothermal springs. The hydro-structures data base isderived from Bryant (1979); the geological faults data base is based on a GIS version oftheLeadville 1 °x2° geological quadrangle map (Tweto and others 1978); and the hydrogeologicMining areas data base is a digitized version of Bryant (l972b). All layers produced by IntegralConsulting Inc. are referenced as 'ICI_HHI 2011 '. Note that because the geologic maps used forthe digitizing are different in scale, the digitized maps show different levels ofresolution withrespect to the (hydro )geology.


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