wastewater report - final plat€¦ · v:\52876\active\187608744-mule deer\reports\wastewater...

$: WasteWater Report - Final Plat€¦ · V:\52876\active\187608744-Mule Deer\Reports\Wastewater Disposal report\WasteWater Report - Final Plat.doc 2 2.0 INTRODUCTION 2.1 Purpose The$
ENGINEERING STUDY for

THE GARDENS AT NORTH CAREFREE WASTEWATER SYSTEM IMPROVEMENTS

March 6, 2019

Prepared For:

Mule Deer Investments, LLC 2727 Glen Arbor Drive

Colorado Springs, CO 80920

Prepared By:

Stantec 5725 Mark Dabling Boulevard, Suite 190

Colorado Springs, CO 80919 719.432.6889

Project No. 187608744

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* * * * * * C O N T E N T S * * * * * *

1.0 EXECUTIVE SUMMARY .....................................................................................................1

2.0 INTRODUCTION ...................................................................................................................2 2.1 Purpose .....................................................................................................................2 2.2 Scope ........................................................................................................................2

3.0 EXISTING CONDITIONS ......................................................................................................3 3.1 Description of the Service Area ...............................................................................3 3.2 Land Use ..................................................................................................................3 3.3 Topography and Floodplains ...................................................................................3 3.4 Geology ....................................................................................................................3 3.5 Groundwater ............................................................................................................3 3.6 Climate .....................................................................................................................4 3.7 Natural Hazards Analysis ........................................................................................4 3.8 Organizational Context ............................................................................................4 3.9 Wastewater Facilities ...............................................................................................4 3.10 Relationship to Neighboring Water and Wastewater Facilities ...............................4 3.11 Wastewater Demand ................................................................................................4

4.0 DEVELOPED CONDITIONS .................................................................................................8 4.1 Land Use ..................................................................................................................8 4.2 Population and Employment ....................................................................................8 4.3 Wastewater Demand ................................................................................................8 4.4 Wastewater Treatment .............................................................................................8

5.0 WASTEWATER SYSTEM IMPROVEMENTS ....................................................................9 5.1 General .....................................................................................................................9 5.2 Wastewater Collection and Treatment .....................................................................9 5.3 Rates and Charges ....................................................................................................9

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* * * * * * A P P E N D I C E S * * * * * * Appendix A Cherokee Metropolitan District Report Appendix B Cherokee Metropolitan District letter of commitment * * * * * * L I S T O F F I G U R E S * * * * * * Figure 1 Vicinity Map Figure 2 1-Mile Radius Map Figure 3 Utility Plan

V:\52876\active\187608744-Mule Deer\Reports\Wastewater Disposal report\WasteWater Report - Final Plat.doc 1

1.0 EXECUTIVE SUMMARY This report presents the results of the engineering study for wastewater system improvements serving The Gardens at North Carefree, a proposed development located south of North Carefree and east of Akers Drive in El Paso County, Colorado. The Gardens at North Carefree consists of 71 single family lots on 11.56 acres. The service area is located within the Sand Creek Basin. The proposed development is within the Cherokee Metropolitan District service area. The average wastewater to be produced by The Gardens at North Carefree is estimated to be 15,718 gallons per day; the Cherokee Metropolitan District will treat this wastewater. The Cherokee Metropolitan District operates under a permit issued by the Colorado Water Quality Control Division, providing for discharge to the Black Squirrel Creek.


2.0 INTRODUCTION

2.1 Purpose The purpose of this report is to present wastewater system improvements recommended to serve The Gardens at North Carefree, a land development project located in El Paso County. It is also intended to serve as a guideline for the ensuing design of recommended improvements.

2.2 Scope The scope of this report includes: 1. The definition of the service area as well as identification of significant physical and environmental

characteristics and constraints; 2. An analysis of available data to determine existing and to project future wastewater demands; and, 3. A description of legal, institutional and managerial arrangements that ensure adequate control of the

proposed improvements.


3.0 EXISTING CONDITIONS

3.1 Description of the Service Area

The Gardens at North Carefree development consists of approximately 11.64 acres with a mixture of residential and open space uses and is located due south of North Carefree Circle and due east of Akers Drive within the East Half of Section 29, Township 13 South, Range 65 West.

Property west south and north of the site is currently being served by the Cherokee Metropolitan District for both water and sewer.

3.2 Land Use

The Gardens at North Carefree development is located in El Paso County on the eastern edge of the City of Colorado Springs urban development. Vacant land can be found east of the site. Most of the vacant land has been through City or County planning processes for development.

3.3 Topography and Floodplains

The topography of the service area is typical of a high desert, short grass prairie with primarily relatively flat slopes generally ranging from 2% to 4%. However, slopes in the 6% to 10% range can be found along the eastern boundary. The service area drains generally west to Akers Drive were existing water and sewer stubs are located.

The Flood Insurance Rate Map (FIRM No. 08041C0539-F dated 3/17/99) indicates that there is no floodplain in the vicinity of the proposed site as shown on Figure 2.

3.4 Geology The site is composed of a single soil type. From the NRCS report in Appendix A, the site falls into the following soil type: 97 – Truckton sandy loam (3-9%) – Type A Soil Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. Group A soil is defined by: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission.

3.5 Groundwater No shallow ground water has been identified on site.


3.6 Climate The climate of the study area is characterized by mild summers and winters, light precipitation, high evaporation and moderately high wind velocities. The climate of the site is typical of a sub-humid to semiarid climate with mild summers and winters. The average temperature is 31 degrees F in the winter and 68.4 degrees in the summer. Total annual precipitation is 15.21 inches.

3.7 Natural Hazards Analysis Natural hazards analysis indicates that no unusual surface or subsurface hazards are located in the service area. However, because the soils are cohesionless, sloughing of steep banks during drilling and/or excavation could occur. By siting improvements in a manner that provides an opportunity to lay the banks of excavations back at a 1:1 slope during construction, the problems associated with sloughing soils can be minimized.

3.8 Organizational Context The Gardens at North Carefree is located in El Paso County and lies within the service area of the Cherokee Metropolitan District.

3.9 Wastewater Facilities Primary Wastewater Facilities are located outside of the boundaries of the Gardens at North Carefree development. Cherokee Metropolitan District facilities include:

Wastewater Treatment Facility Wastewater Collection and pumping facilities

3.10 Relationship to Neighboring Water and Wastewater Facilities

The location of other major water and wastewater facilities, relative to the Gardens at North Carefree Development, are shown on Figure 2.

Figure 2 identifies water wells and habitable buildings within a 1-mile radius of the center of The Gardens at North Carefree. No known wells are within the 1-mile radius.

3.11 Wastewater Demand The Gardens at North Carefree will be serviced by the Cherokee Metropolitan District and is assumed to have the same unit wastewater demands as the rest of the Cherokee Metropolitan District. Residential Demand within the District is estimated to be 80% of the water demand of 0.31 ac-ft./year per SFE or 22.01 ac-ft. or 19,648 GPD; Waste flow is estimated to be 15,718 GPD.

Figure No.

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THE GARDENS AT NORTH CAREFREE

MASTER UTILITY PLAN


4.0 DEVELOPED CONDITIONS

4.1 Land Use

This report addresses The Gardens at North Carefree development anticipated to be submitted to El Paso County for review in August of 2018. The proposed use is for 71 single family lots.

4.2 Population and Employment By using the land use information noted above and applying standard unit densities of 2.9 persons per dwelling for single family residential uses, 2.5 persons per dwelling for multifamily residential uses and 600 square feet per employee for commercial/industrial uses, permanent resident, and employment forecasts for The Gardens at North Carefree are 206 permanent residence.

4.3 Wastewater Demand Residential Demand within the District is estimated to be 80% of the water demand of 0.31 ac-ft./year per SFE or 22.01 ac-ft. or 19,648 GPD; Waste flow is estimated to be 15,718 GPD.

4.4 Wastewater Treatment The Cherokee Metropolitan District has treatment facilities to meet Colorado Department of Health and Environment standards. This treatment process is outlined in the report in Appendix A.


5.0 WASTEWATER SYSTEM IMPROVEMENTS

5.1 General The wastewater system operated by Cherokee Metropolitan District meets the applicable requirements of the Colorado Department of Health and Environment (CDHE). The wastewater treatment facility is located in the Black Squirrel Creek Basin and processes wastewater to CDHE and U.S. EPA standards prior to discharging.

5.2 Wastewater Collection and Treatment The wastewater is collected and conveyed to the Wastewater Treatment Facility via a series of underground pipe systems. All pipe and appurtenances will be designed to meet or exceed AWWA standards. The Wastewater Treatment Facility operates under a permit issued by the Colorado Water Quality Control division, providing for discharge to Black Squirrel Creek. Water quality testing indicates that the treated wastewater exceeds CDHE and U.S. EPA standards prior to discharge back. Specifics concerning treatment are provided in the District report in Appendix A.

5.3 Rates and Charges The Cherokee Metropolitan District will impose one-time charges to recoup the cost of constructing water system improvements as well as regular periodic billings to recoup continuing costs for operations, maintenance and equipment replacement. This system of rates and charts is outlined in the "Service Plan for the Cherokee Metropolitan District".

Appendix A Cherokee Metropolitan District Report

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ccur

. We

can

use

this

info

rmat

ion

to e

valu

ate

the

need

to im

prov

e ou

r cu

rren

t wat

er

trea

tmen

t cap

abil

itie

s an

d pr

epar

e fo

r fu

ture

con

tam

inat

ion

thre

ats.

Thi

s ca

n he

lp u

s en

sure

that

qua

lity

fin

ishe

d w

ater

is d

eliv

ered

to y

our

hom

es. I

n ad

diti

on, t

he s

ourc

e w

ater

as

sess

men

t res

ults

pro

vide

a s

tart

ing

poin

t for

dev

elop

ing

a so

urce

wat

er p

rote

ctio

n pl

an.

Pot

enti

al s

ourc

es o

f co

ntam

inat

ion

in o

ur s

ourc

e w

ater

are

a ar

e li

sted

on

the

next

pag

e.

Ple

ase

cont

act u

s to

lear

n m

ore

abou

t wha

t you

can

do

to h

elp

prot

ect y

our

drin

king

wat

er s

ourc

es, a

ny q

uest

ions

abo

ut th

e D

rink

ing

Wat

er Q

uali

ty R

epor

t, to

lear

n m

ore

abou

t ou

r sy

stem

, or

to a

tten

d sc

hedu

led

publ

ic m

eeti

ngs.

We

wan

t you

, our

val

ued

cust

omer

s, to

be

info

rmed

abo

ut th

e se

rvic

es w

e pr

ovid

e an

d th

e qu

alit

y w

ater

we

deli

ver

to y

ou

ever

y da

y.

Ou

r W

ater

Sou

rces

Sou

rce

Sou

rce

Typ

e W

ater

Typ

e P

oten

tial

Sou

rce(

s) o

f C

onta

min

atio

n

WE

LL

S 1

TH

RO

UG

H 1

3 W

ell

Gro

undw

ater

R

ow c

rops

, fal

low

, sm

all g

rain

s, p

astu

re/h

ay,

sept

ic s

yste

ms,

roa

d m

iles

WE

LL

S 1

5 T

HR

OU

GH

20

Wel

l G

roun

dwat

er

WE

LL

21

AR

-1

Wel

l G

roun

dwat

er

WE

LL

22

DN

-4

Wel

l G

roun

dwat

er

CH

ER

OK

EE

MD

, PW

S ID

: CO

0121

125

2

018

CC

R P

age

3 of

7

Ter

ms

and

Ab

bre

viat

ions

M

axim

um

Con

tam

inan

t L

evel

(M

CL

) −

The

hig

hest

leve

l of

a co

ntam

inan

t all

owed

in d

rink

ing

wat

er.

T

reat

men

t T

ech

niq

ue

(TT

) −

A r

equi

red

proc

ess

inte

nded

to r

educ

e th

e le

vel o

f a

cont

amin

ant i

n dr

inki

ng w

ater

.

H

ealt

h-B

ased

− A

vio

lati

on o

f ei

ther

a M

CL

or

TT

.

N

on-H

ealt

h-B

ased

− A

vio

lati

on th

at is

not

a M

CL

or

TT

.

A

ctio

n L

evel

(A

L) −

The

conc

entra

tion

of a

con

tam

inan

t whi

ch, i

f exc

eede

d, tr

igge

rs tr

eatm

ent a

nd o

ther

reg

ulat

ory

requ

irem

ents

.

M

axim

um

Res

idu

al D

isin

fect

ant

Lev

el (

MR

DL

) −

The

high

est l

evel

of a

dis

infe

ctan

t allo

wed

in d

rinki

ng w

ater

. The

re is

con

vinc

ing

evid

ence

that

add

ition

of a

di

sinf

ecta

nt is

nec

essa

ry f

or c

ontr

ol o

f m

icro

bial

con

tam

inan

ts.

M

axim

um

Con

tam

inan

t L

evel

Goa

l (M

CL

G) −

The

leve

l of

a co

ntam

inan

t in

drin

king

wat

er b

elow

whi

ch th

ere

is n

o kn

own

or e

xpec

ted

risk

to h

ealt

h. M

CL

Gs

allo

w

for

a m

argi

n of

saf

ety.

M

axim

um

Res

idu

al D

isin

fect

ant

Lev

el G

oal (

MR

DL

G) −

The

leve

l of a

drin

king

wat

er d

isin

fect

ant,

belo

w w

hich

ther

e is

no

know

n or

exp

ecte

d ris

k to

hea

lth.

M

RD

LG

s do

not

ref

lect

the

bene

fits

of

the

use

of d

isin

fect

ants

to c

ontr

ol m

icro

bial

con

tam

inan

ts.

V

iola

tion

(N

o A

bb

revi

atio

n) −

Fai

lure

to m

eet a

Col

orad

o P

rim

ary

Dri

nkin

g W

ater

Reg

ulat

ion.

F

orm

al E

nfo

rcem

ent

Act

ion

(N

o A

bb

revi

atio

n) −

Esc

alat

ed a

ctio

n ta

ken

by th

e S

tate

(du

e to

the

risk

to p

ubli

c he

alth

, or

num

ber

or s

ever

ity

of v

iola

tion

s) to

bri

ng a

no

n-co

mpl

iant

wat

er s

yste

m b

ack

into

com

plia

nce.

V

aria

nce

an

d E

xem

pti

ons

(V/E

) −

Dep

artm

ent p

erm

issi

on n

ot to

mee

t a M

CL

or

trea

tmen

t tec

hniq

ue u

nder

cer

tain

con

diti

ons.

G

ross

Alp

ha

(No

Ab

bre

viat

ion

) −

Gro

ss a

lpha

par

ticl

e ac

tivi

ty c

ompl

ianc

e va

lue.

It i

nclu

des

radi

um-2

26, b

ut e

xclu

des

rado

n 22

2, a

nd u

rani

um.

P

icoc

uri

es p

er li

ter

(pC

i/L

) −

Mea

sure

of

the

radi

oact

ivit

y in

wat

er.

N

eph

elom

etri

c T

urb

idit

y U

nit

(N

TU

) −

Mea

sure

of

the

clar

ity

or c

loud

ines

s of

wat

er. T

urbi

dity

in e

xces

s of

5 N

TU

is ju

st n

otic

eabl

e to

the

typi

cal p

erso

n.

C

omp

lian

ce V

alu

e (N

o A

bb

revi

atio

n)

– S

ingl

e or

cal

cula

ted

valu

e us

ed to

det

erm

ine

if r

egul

ator

y co

ntam

inan

t lev

el (

e.g.

MC

L)

is m

et. E

xam

ples

of

calc

ulat

ed v

alue

s ar

e th

e 90

th P

erce

ntil

e, R

unni

ng A

nnua

l Ave

rage

(R

AA

) an

d L

ocat

iona

l Run

ning

Ann

ual A

vera

ge (

LR

AA

).

A

vera

ge (

x-b

ar) −

Typi

cal v

alue

.

R

ange

(R

) −

Low

est v

alue

to th

e hi

ghes

t val

ue.

S

amp

le S

ize

(n) −

Num

ber

or c

ount

of

valu

es (

i.e. n

umbe

r of

wat

er s

ampl

es c

olle

cted

).

P

arts

per

mil

lion

= M

illi

gram

s p

er li

ter

(pp

m =

mg/

L) −

One

par

t per

mill

ion

corr

espo

nds t

o on

e m

inut

e in

two

year

s or

a s

ingl

e pe

nny

in $

10,0

00.

P

arts

per

bil

lion

= M

icro

gram

s p

er li

ter

(pp

b =

ug/

L) −

One

par

t per

bill

ion

corr

espo

nds t

o on

e m

inut

e in

2,0

00 y

ears

, or a

sin

gle

penn

y in

$10

,000

,000

.

N

ot A

pp

lica

ble

(N

/A)

– D

oes

not a

pply

or

not a

vail

able

.

L

evel

1 A

sses

smen

t –

A s

tudy

of

the

wat

er s

yste

m to

iden

tify

pot

enti

al p

robl

ems

and

dete

rmin

e (i

f po

ssib

le)

why

tota

l col

ifor

m b

acte

ria

have

bee

n fo

und

in o

ur w

ater

sys

tem

.

L

evel

2 A

sses

smen

t –

A v

ery

deta

iled

stu

dy o

f th

e w

ater

sys

tem

to id

entif

y po

tent

ial p

robl

ems

and

dete

rmin

e (i

f po

ssib

le)

why

an

E. c

oli M

CL

vio

lati

on h

as o

ccur

red

and/

or

why

tota

l col

ifor

m b

acte

ria

have

bee

n fo

und

in o

ur w

ater

sys

tem

on

mul

tipl

e oc

casi

ons.

CH

ER

OK

EE

MD

, PW

S ID

: CO

0121

125

2

018

CC

R P

age

4 of

7

Det

ecte

d C

onta

min

ants

CH

ER

OK

EE

MD

rou

tine

ly m

onit

ors

for

cont

amin

ants

in y

our

drin

king

wat

er a

ccor

ding

to F

eder

al a

nd S

tate

law

s. T

he f

ollo

win

g ta

ble(

s) s

how

all

det

ecti

ons

foun

d in

the

peri

od

of J

anua

ry 1

to D

ecem

ber

31, 2

017

unle

ss o

ther

wis

e no

ted.

The

Sta

te o

f C

olor

ado

requ

ires

us

to m

onit

or f

or c

erta

in c

onta

min

ants

less

than

onc

e pe

r ye

ar b

ecau

se th

e co

ncen

trat

ions

of

thes

e co

ntam

inan

ts a

re n

ot e

xpec

ted

to v

ary

sign

ific

antl

y fr

om y

ear

to y

ear,

or

the

syst

em is

not

con

side

red

vuln

erab

le to

this

type

of

cont

amin

atio

n. T

here

fore

, so

me

of o

ur d

ata,

thou

gh r

epre

sent

ativ

e, m

ay b

e m

ore

than

one

yea

r ol

d. V

iola

tion

s an

d F

orm

al E

nfor

cem

ent A

ctio

ns, i

f an

y, a

re r

epor

ted

in th

e ne

xt s

ecti

on o

f th

is r

epor

t. N

ote:

Onl

y de

tect

ed c

onta

min

ants

sam

pled

wit

hin

the

last

5 y

ears

app

ear

in th

is r

epor

t. If

no

tabl

es a

ppea

r in

this

sec

tion

then

no

cont

amin

ants

wer

e de

tect

ed in

the

last

rou

nd o

f m

onit

orin

g.

Dis

infe

ctan

ts S

amp

led

in t

he

Dis

trib

uti

on S

yste

m

TT

Req

uire

men

t: A

t lea

st 9

5% o

f sa

mpl

es p

er p

erio

d (m

onth

or

quar

ter)

mus

t be

at le

ast 0

.2 p

pm O

R If

sam

ple

size

is le

ss th

an 4

0 no

mor

e th

an 1

sam

ple

is b

elow

0.2

ppm

T

ypic

al S

ourc

es:

Wat

er a

ddit

ive

used

to c

ontr

ol m

icro

bes

Dis

infe

ctan

t N

ame

Tim

e P

erio

d

Res

ults

N

um

ber

of

Sam

ple

s B

elow

Lev

el

Sam

ple

Siz

e T

T

Vio

lati

on

MR

DL

Chl

orin

e 01

/01/

2017

to 1

2/31

/201

7 L

owes

t per

iod

perc

enta

ge o

f sa

mpl

es m

eeti

ng

TT

req

uire

men

t: 9

6%

0 25

5 N

o 4.

0 pp

m

Lea

d a

nd

Cop

per

Sam

ple

d in

th

e D

istr

ibu

tion

Sys

tem

Con

tam

inan

t N

ame

Tim

e P

erio

d

90th

Per

cent

ile

S

ampl

e S

ize

Uni

t of

M

easu

re

90th

P

erce

ntile

A

L

Sam

ple

Sit

es

Abo

ve A

L

90th

Per

cent

ile

AL

E

xcee

dan

ce

Typ

ical

Sou

rces

Cop

per

06/1

3/20

17 to

06

/15/

2017

0.

42

30

ppm

1.

3 0

No

Cor

rosi

on o

f ho

useh

old

plum

bing

sys

tem

s; E

rosi

on o

f na

tura

l dep

osit

s

Lea

d 06

/13/

2017

to

06/1

5/20

17

4 30

pp

b 15

2

No

Cor

rosi

on o

f ho

useh

old

plum

bing

sys

tem

s; E

rosi

on o

f na

tura

l dep

osit

s

CH

ER

OK

EE

MD

, PW

S ID

: CO

0121

125

2

018

CC

R P

age

5 of

7

Dis

infe

ctio

n B

ypro

du

cts

Sam

ple

d in

th

e D

istr

ibu

tion

Sys

tem

Nam

e Y

ear

Ave

rage

R

ange

L

ow –

Hig

h S

ampl

e S

ize

Uni

t of

M

easu

re

MC

L

MC

LG

H

ighe

st

Com

pli

ance

V

alu

e

MC

L

Vio

lati

on

Typ

ical

Sou

rces

Tot

al H

aloa

ceti

c A

cids

(H

AA

5)

2017

4.

46

0 to

8.5

16

pp

b 60

N

/A

8.5

No

Byp

rodu

ct o

f dr

inki

ng

wat

er d

isin

fect

ion

Tot

al T

riha

lom

etha

nes

(TT

HM

) 20

17

19.0

3 5.

6 to

34.

5 16

pp

b 80

N

/A

34.5

N

o B

ypro

duct

of

drin

king

w

ater

dis

infe

ctio

n

R

adio

nu

clid

es S

amp

led

at

the

En

try

Poi

nt

to t

he

Dis

trib

uti

on S

yste

m

Typ

ical

Sou

rces

Y

ear

Ave

rage

R

ange

L

ow –

Hig

h S

ampl

e S

ize

Uni

t of

M

easu

re

MC

L

MC

LG

M

CL

V

iola

tion

Gro

ss A

lpha

20

17

1.1

1.1

to 1

.1

1 pC

i/L

15

0

No

Ero

sion

of

natu

ral d

epos

its

Com

bine

d R

adiu

m

2017

3.

4 3.

4 to

3.4

1

pCi/

L

5 0

No

Ero

sion

of

natu

ral d

epos

its

Gro

ss B

eta

Par

ticl

e A

ctiv

ity

2016

0.

1 0.

1 to

0.1

1

pCi/

L*

50

0 N

o D

ecay

of

natu

ral a

nd m

an-m

ade

depo

sits

*The

MC

L f

or G

ross

Bet

a P

arti

cle

Act

ivit

y is

4 m

rem

/yea

r. S

ince

ther

e is

no

sim

ple

conv

ersi

on b

etw

een

mre

m/y

ear

and

pCi/

L E

PA

con

side

rs 5

0 pC

i/L

to b

e th

e le

vel o

f co

ncer

n fo

r G

ross

Bet

a P

arti

cle

Act

ivit

y.

CH

ER

OK

EE

MD

, PW

S ID

: CO

0121

125

2

018

CC

R P

age

6 of

7

Inor

gan

ic C

onta

min

ants

Sam

ple

d a

t th

e E

ntr

y P

oin

t to

th

e D

istr

ibu

tion

Sys

tem

Con

tam

inan

t N

ame

Yea

r A

vera

ge

Ran

ge

Low

– H

igh

Sam

ple

Siz

e U

nit

of

Mea

sure

M

CL

M

CL

G

MC

L

Vio

lati

on

Typ

ical

Sou

rces

Ars

enic

20

17

0.33

0

to 2

6

ppb

10

0 N

o E

rosi

on o

f na

tura

l dep

osit

s; r

unof

f fr

om

orch

ards

; run

off

from

gla

ss a

nd e

lect

roni

cs

prod

uctio

n w

aste

s

Bar

ium

20

17

0.06

0.

04 to

0.0

7 6

ppm

2

2 N

o D

isch

arge

of

dril

ling

was

tes;

dis

char

ge f

rom

m

etal

ref

iner

ies;

ero

sion

of

natu

ral d

epos

its

Flu

orid

e 20

17

0.74

0.

31 to

1.6

3

ppm

4

4 N

o E

rosi

on o

f na

tura

l dep

osit

s; w

ater

add

itiv

e w

hich

pr

omot

es s

tron

g te

eth;

dis

char

ge f

rom

fer

tili

zer

and

alum

inum

fac

tori

es

Nit

rate

20

17

6.94

0

to 9

.3

9 pp

m

10

10

No

Run

off

from

fer

tili

zer

use;

leac

hing

fro

m s

epti

c ta

nks,

sew

age;

ero

sion

of

natu

ral d

epos

its

Sel

eniu

m

2017

4.

33

0 to

8

6 pp

b 50

50

N

o D

isch

arge

fro

m p

etro

leum

and

met

al r

efin

erie

s;

eros

ion

of n

atur

al d

epos

its; d

isch

arge

fro

m m

ines

Nit

rate

: Nitr

ate

in d

rink

ing

wat

er a

t lev

els a

bove

10

ppm

is a

hea

lth

risk

for

infa

nts

of le

ss th

an s

ix m

onth

s of

age

. Hig

h ni

trat

e le

vels

in d

rink

ing

wat

er c

an c

ause

blu

e ba

by

synd

rom

e. N

itra

te le

vels

may

ris

e qu

ickl

y fo

r sh

ort p

erio

ds o

f tim

e be

caus

e of

rai

nfal

l or

agri

cult

ural

act

ivit

y. I

f yo

u ar

e ca

ring

for

an

infa

nt y

ou s

houl

d as

k ad

vice

fro

m y

our

heal

th

care

pro

vide

r.

Sec

ond

ary

Con

tam

inan

ts**

**

Sec

onda

ry s

tand

ards

are

non

-enf

orce

able

gui

deli

nes

for

cont

amin

ants

that

may

cau

se c

osm

etic

eff

ects

(su

ch a

s sk

in, o

r to

oth

disc

olor

atio

n) o

r ae

sthe

tic

effe

cts

(suc

h as

tast

e, o

dor,

or

colo

r) in

dri

nkin

g w

ater

.

Con

tam

inan

t N

ame

Yea

r A

vera

ge

Ran

ge

Low

– H

igh

Sam

ple

Siz

e U

nit

of M

easu

re

Sec

ond

ary

Sta

nda

rd

Sod

ium

20

17

49.8

2 21

.1 to

73.

2 6

ppm

N

/A

Tot

al D

isso

lved

Sol

ids

2017

33

7.7

248

- 47

2 16

pp

m

500

CH

ER

OK

EE

MD

, PW

S ID

: CO

0121

125

2

018

CC

R P

age

7 of

7

Vio

lati

ons,

Sig

nif

ican

t D

efic

ien

cies

, Bac

kflo

w/C

ross

-Con

nec

tion

, an

d F

orm

al E

nfo

rcem

ent

Act

ions

Vio

lati

ons

Nam

e C

ateg

ory

Tim

e P

erio

d

Hea

lth

Eff

ects

C

omp

lian

ce

Val

ue

TT

Lev

el o

r M

CL

CR

OS

S C

ON

NE

CT

ION

RU

LE

F

AIL

UR

E T

O M

EE

T C

RO

SS

C

ON

NE

CT

ION

/BA

CK

FL

OW

R

EQ

UIR

EM

EN

TS

- H

EA

LT

H-

BA

SE

D

01/0

1/20

17 -

06/

12/2

017

May

pos

e a

risk

to p

ubli

c he

alth

. N

/A

N/A

Ad

dit

ion

al V

iola

tion

Inf

orm

atio

n

*Ple

ase

shar

e th

is in

form

atio

n w

ith

all t

he o

ther

peo

ple

who

dri

nk th

is w

ater

, esp

ecia

lly

thos

e w

ho m

ay n

ot h

ave

rece

ived

this

not

ice

dire

ctly

(fo

r ex

ampl

e, p

eopl

e in

apa

rtm

ents

, nur

sing

ho

mes

, sch

ools

, and

bus

ines

ses)

. You

can

do

this

by

post

ing

this

not

ice

in a

pub

lic

plac

e or

dis

trib

utin

g co

pies

by

hand

or

mai

l.*

Exp

lana

tion

of

the

viol

atio

n(s)

, the

ste

ps ta

ken

to r

esol

ve th

em, a

nd th

e an

tici

pate

d re

solv

ed d

ate:

Bac

kflo

w a

nd

Cro

ss-C

onn

ecti

on

Che

roke

e M

etro

poli

tan

Dis

tric

t had

an

inad

equa

te b

ackf

low

pre

vent

ion

and

cros

s-co

nnec

tion

con

trol

pro

gram

in 2

016

and

fail

ed to

mee

t the

spe

cifi

ed p

erce

ntag

e of

bac

kflo

w

devi

ce te

stin

g re

quir

ed b

y th

e C

olor

ado

Dep

artm

ent o

f P

ubli

c H

ealt

h an

d E

nvir

onm

ent.

The

Dis

tric

t is

curr

entl

y in

com

plia

nce

wit

h th

e C

ross

Con

nect

ion

Rul

e. U

ncon

trol

led

cros

s co

nnec

tion

s ca

n le

ad to

inad

vert

ent c

onta

min

atio

n of

the

drin

king

wat

er.

Appendix B

Cherokee Metropolitan District letter of commitment

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