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transcript
Prepared For:
Larry H. Miller
LHM Thornton
Landmark
Towers
10289 Quivas Street
Thornton, Colorado
Anderson, Wahlen & Associates, Inc.
2010 North Redwood Road
Salt Lake City, Utah 84116
Phone: (801) 521-8529
Fax: (801) 521-9551
Project #: 14-116
Date: December 13, 2016
Utility Report
1/17/2017
Responsible Party Certification
“________ hereby certifies that the sewer and water systems for Landmark Towers will be constructed
according to the design presented in this report. I understand that the City of Thornton does not and
shall not assume liability for the sewer and water system designed and/or certified by my engineer. I
understand that the City of Thornton reviews utility plans, but cannot, on behalf of Landmark Towers,
guarantee that final utility design review will absolve ________ and/or their successors and/or assigns of
future liability for improper design. I further understand that approval of the Plat and/or Development
Permit does not imply approval of my engineer’s utility design.”
Attest:
“I hereby certify that this report (plan) for the Final Utility Design of Landmark Towers was
prepared by me (or under my direct supervision) in accordance with the provisions of the City of
Thornton Standards and Specifications for the Design and Construction of the Public and Private
Improvements for the Responsible Parties thereof. I understand that the City of Thornton does
not and shall not assume liability for utilities designed by others.”
XRegistered Pro fession al En g ineer
State of Co lo rado No. ____________________
XName of Respon sib le Party
XNotary Pu b lic
XAuth orized Sign atu re
Table of Contents GENERAL LOCATION MAP ............................................................................................................................. 1
PROPERTY LOCATION & DESCRIPTION ......................................................................................................... 2
PROPERTY LOCATION ................................................................................................................................ 2
DESCRIPTION OF PROPERTY ..................................................................................................................... 2
Basins and Pressure Zones. ........................................................................................................................... 2
MAJOR BASIN AND SUB-BASIN DESCRIPTION .......................................................................................... 2
DRAINAGE DESIGN CRITERIA ........................................................................................................................ 3
REGULATIONS ........................................................................................................................................... 3
DEVELOPMENT CRITERIA REFERENCE AND CONSTRAINTS ...................................................................... 3
SYSTEM DESIGN CRITERIA ......................................................................................................................... 3
Conclusions ................................................................................................................................................... 4
COMPLIANCE WITH STANDARDS .............................................................................................................. 4
APPENDICES .................................................................................................................................................. 6
1
GENERAL LOCATION MAP
Landmark Towers: 10289 Quivas Street
Thornton, Colorado
2
PROPERTY LOCATION & DESCRIPTION
PROPERTY LOCATION
The proposed property is a Portion of the Northwest Quarter of Section 16, Township 2 South, and
Range 68 West of the 6th P.M. City of Thornton, County of Adams, in the State of Colorado. The address
of the site is 10289 Quivas Street, Thornton, Colorado.
The 6.55 acre site is currently undeveloped. The property is bound on the north by a Five Star Collision
Center-Auto Repair shop, to the east by Quivas Street, to the south by residential housing and a
developed commercial lot, and to the west the Alpine Glen Veterinary Clinic.
DESCRIPTION OF PROPERTY
Existing conditions of, the 6.55 acre, site consist primarily of undeveloped land covered by soil and
weeds. The site is relatively flat with the soils containing Platner loam and Ulm loam (Appendix I, Soil
Classification). Existing drainage of the site occurs from the west to the northeast side of the property.
The proposed project’s land use will be for Vehicle Service and Storage with a majority of the area
consisting of a parking lot. The site will consist a 4,010 square foot building, parking lot, and landscape
area located within the parking lot. A 10.0’ Public Service Utility Easement will be located south of the
proposed parking lot and a 10’ Gas Easement will be located through the north portion of the site
(Appendix II, Utility Plan)
BASINS AND PRESSURE ZONES
MAJOR BASIN AND SUB-BASIN DESCRIPTION
The site is located within Zone X (unshaded) of the FEMA floodplain, as determined by the Flood
Insurance Rate Map for Adams County, Colorado, Panel 294 and Map Number 08001C0294H, revised on
March 5, 2007 (Appendix III, FEMA FLOOD MAP).
The existing drainage for the site consist of overland sheet low to the northeast onto the neighboring
property. After construction, all storm water generated onsite will be collected into the site storm drain
network and ultimately detained in a detention basin located on the northeast side of the property.
Storm water will be detained and released to the City at a metered rate. The detention pond has a
3
Trickle Channel to direct low flows, which drains to an inlet/outlet structure before connecting to a curb
drain in Quivas Street.
With the majority of the site consisting of impervious area, the site increases runoff of 21.78 cfs for
existing conditions to 36cfs for the developed condition for the 100 year return period. These
calculations were determined by the Rational Method. This site was divided into roof area, landscaping
and hard surfaces to determine the runoff coefficient. Individual runoff coefficients of 0.13, 0.85 , and
0.9 were used for landscape, roof, and impervious surfaces respectively. The existing conditions of the
site contain soil and nuisance weeds with a low runoff coefficient of 0.13 and the developed condition,
containing 82% of impervious area, having a runoff coefficient of 0.77.
DRAINAGE DESIGN CRITERIA
REGULATIONS
It is not foreseen that there will be any deviations from the criteria. All waterlines and sanitary sewer
lines shall be constructed per the City of Thornton Standards and Specifications for the design and
Construction of Public and Private Improvements and all Applicable Master plans in effect at the time of
development.
DEVELOPMENT CRITERIA REFERENCE AND CONSTRAINTS
To our knowledge there have been no previous utility studies (i.e., utility reports, project master plans,
etc.) done for this site in question, and no adjacent utility studies. All storm water produced on site will
be contained and will not drain to neighboring property.
SYSTEM DESIGN CRITERIA
The subject property lies within water zone 5, which has a High HGL equal to 5,675 and a Low HGL equal
to 5,675. The proposed finish floor of the building is 5524.00, which would provide an estimated static
pressure of 65 psi for both high and low. The peak water demand is anticipated to be 116 gpm. All
waterlines constructed shall be looped; in addition, the system pressure reducing valves shall be utilized
to keep the static pressure below 100 psi. A minimum static pressure of 40 psi shall be maintained for
the site. All Meters shall be sized in accordance with the adopted version on International Plumbing
Code and all adopted appendices in effect at the time of approval. Water meters are to be installed per
4
city standards and specifications. It will be the contractor's responsibility to install all items required.
The City of Thornton Standards and Specifications in Section 200 and 300 for water and sanitary sewer
design criteria shall be met. In other words, all piping materials shall be per local agency standards. All
utility piping shall be installed per manufacturer’s recommendations.
Conclusions
COMPLIANCE WITH STANDARDS
The LHM Thornton site located at 10289 Quivas Street is in compliance with the City of Thornton in the
State of Colorado Standards and Specifications Manual. The subject property lies within Water Zone 5
which contains a High HGL of 5,675 and a Low HGL of 5,675. The peak water demand is anticipated to be
116 gpm. The minimum static pressure of 40 psi is required and has an estimated static pressure of 65
psi.
All piping materials shall be per local agency standards, and installed per manufacturer’s
recommendations.
5
REFERENCES
City of Thornton (2012, October). City of Thornton – Standards and Specifications. Retrieved from
https://cityofthornton.net/government/citydevelopment/Pages/standards-specifications.aspx
United States Department of Agriculture, Natural Resources Conservation Service (n.d.). Web Soil
Survey. Retrieved from https://websoilsurvey.nrcs.usda.gov/app/WebSoilSurvey.aspx
FEMA (n.d.). FEMA Flood Map Service Center. Retrieved from http://msc.fema.gov/portal
6
APPENDICES
APPENDIX I – WEB SOIL SURVEY (SOIL CLASSIFICATION)
APPENDIX II – CIVIL UTILITY SHEET
APPENDIX III – FEMA FLOOD MAP
APPENDIX I - WEB SOIL SURVY (SOIL CLASSIFICATION)
Hyd
rolo
gic
Soi
l Gro
up—
Ada
ms
Cou
nty
Are
a, P
arts
of A
dam
s an
d D
enve
r Cou
ntie
s, C
olor
ado
(LH
M -
Thor
nton
)
Nat
ural
Res
ourc
esC
onse
rvat
ion
Serv
ice
Web
Soi
l Sur
vey
Nat
iona
l Coo
pera
tive
Soi
l Sur
vey
12/2
6/20
16P
age
1 of
4
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4414610441464044146704414700441473044147604414790
4991
1049
9140
4991
7049
9200
4992
3049
9260
4992
9049
9320
4993
5049
9380
4991
1049
9140
4991
7049
9200
4992
3049
9260
4992
9049
9320
4993
5049
9380
39° 5
2' 5
9'' N
105° 0' 37'' W
39° 5
2' 5
9'' N
105° 0' 25'' W
39° 5
2' 5
3'' N
105° 0' 37'' W
39° 5
2' 5
3'' N
105° 0' 25'' W
N
Map
pro
ject
ion:
Web
Mer
cato
r C
orne
r coo
rdin
ates
: WGS
84
Edge
tics
: UTM
Zon
e 13
N W
GS84
050
100
200
300Fe
et0
1530
6090M
eter
sM
ap S
cale:
1:1
,330
if p
rinte
d on
A la
ndsc
ape
(11"
x 8
.5")
shee
t.
Soi
l Map
may
not
be
valid
at
this
sca
le.
MA
P LE
GEN
DM
AP
INFO
RM
ATIO
N
Are
a of
Inte
rest
(AO
I)A
rea
of In
tere
st (A
OI)
Soils So
il R
atin
g Po
lygo
nsA A
/D
B B/D
C C/D
D Not
rate
d or
not
ava
ilabl
e
Soil
Rat
ing
Line
sA A
/D
B B/D
C C/D
D Not
rate
d or
not
ava
ilabl
e
Soil
Rat
ing
Poin
tsA A
/D
B B/D
C C/D
D Not
rate
d or
not
ava
ilabl
e
Wat
er F
eatu
res
Stre
ams
and
Can
als
Tran
spor
tatio
nR
ails
Inte
rsta
te H
ighw
ays
US
Rou
tes
Maj
or R
oads
Loca
l Roa
ds
Bac
kgro
und A
eria
l Pho
togr
aphy
The
soil
surv
eys
that
com
pris
e yo
ur A
OI w
ere
map
ped
at1:
20,0
00.
War
ning
: Soi
l Map
may
not
be
valid
at t
his
scal
e.
Enl
arge
men
t of m
aps
beyo
nd th
e sc
ale
of m
appi
ng c
an c
ause
mis
unde
rsta
ndin
g of
the
deta
il of
map
ping
and
acc
urac
y of
soi
llin
e pl
acem
ent.
The
map
s do
not
sho
w th
e sm
all a
reas
of
cont
rast
ing
soils
that
cou
ld h
ave
been
sho
wn
at a
mor
e de
taile
dsc
ale.
Ple
ase
rely
on
the
bar s
cale
on
each
map
she
et fo
r map
mea
sure
men
ts.
Sou
rce
of M
ap:
Nat
ural
Res
ourc
es C
onse
rvat
ion
Ser
vice
Web
Soi
l Sur
vey
UR
L:C
oord
inat
e S
yste
m:
Web
Mer
cato
r (E
PS
G:3
857)
Map
s fro
m th
e W
eb S
oil S
urve
y ar
e ba
sed
on th
e W
eb M
erca
tor
proj
ectio
n, w
hich
pre
serv
es d
irect
ion
and
shap
e bu
t dis
torts
dist
ance
and
are
a. A
pro
ject
ion
that
pre
serv
es a
rea,
suc
h as
the
Alb
ers
equa
l-are
a co
nic
proj
ectio
n, s
houl
d be
use
d if
mor
eac
cura
te c
alcu
latio
ns o
f dis
tanc
e or
are
a ar
e re
quire
d.
This
pro
duct
is g
ener
ated
from
the
US
DA
-NR
CS
cer
tifie
d da
ta a
sof
the
vers
ion
date
(s) l
iste
d be
low
.
Soi
l Sur
vey
Are
a:
Ada
ms
Cou
nty
Are
a, P
arts
of A
dam
s an
dD
enve
r Cou
ntie
s, C
olor
ado
Sur
vey
Are
a D
ata:
Ve
rsio
n 13
, Sep
22,
201
6
Soi
l map
uni
ts a
re la
bele
d (a
s sp
ace
allo
ws)
for m
ap s
cale
s1:
50,0
00 o
r lar
ger.
Dat
e(s)
aer
ial i
mag
es w
ere
phot
ogra
phed
: A
ug 3
0, 2
014—
Sep
18, 2
014
The
orth
opho
to o
r oth
er b
ase
map
on
whi
ch th
e so
il lin
es w
ere
com
pile
d an
d di
gitiz
ed p
roba
bly
diffe
rs fr
om th
e ba
ckgr
ound
imag
ery
disp
laye
d on
thes
e m
aps.
As
a re
sult,
som
e m
inor
shift
ing
of m
ap u
nit b
ound
arie
s m
ay b
e ev
iden
t.
Hyd
rolo
gic
Soi
l Gro
up—
Ada
ms
Cou
nty
Are
a, P
arts
of A
dam
s an
d D
enve
r Cou
ntie
s, C
olor
ado
(LH
M -
Thor
nton
)
Nat
ural
Res
ourc
esC
onse
rvat
ion
Serv
ice
Web
Soi
l Sur
vey
Nat
iona
l Coo
pera
tive
Soi
l Sur
vey
12/2
6/20
16P
age
2 of
4
Hydrologic Soil Group
Hydrologic Soil Group— Summary by Map Unit — Adams County Area, Parts of Adams and Denver Counties, Colorado(CO001)
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
PlC Platner loam, 3 to 5percent slopes
C 5.7 85.6%
UlD Ulm loam, 5 to 9 percentslopes
C 1.0 14.4%
Totals for Area of Interest 6.7 100.0%
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils areassigned to one of four groups according to the rate of water infiltration when thesoils are not protected by vegetation, are thoroughly wet, and receiveprecipitation from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) andthree dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) whenthoroughly wet. These consist mainly of deep, well drained to excessivelydrained sands or gravelly sands. These soils have a high rate of watertransmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. Theseconsist chiefly of moderately deep or deep, moderately well drained or welldrained soils that have moderately fine texture to moderately coarse texture.These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consistchiefly of soils having a layer that impedes the downward movement of water orsoils of moderately fine texture or fine texture. These soils have a slow rate ofwater transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) whenthoroughly wet. These consist chiefly of clays that have a high shrink-swellpotential, soils that have a high water table, soils that have a claypan or claylayer at or near the surface, and soils that are shallow over nearly imperviousmaterial. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter isfor drained areas and the second is for undrained areas. Only the soils that intheir natural condition are in group D are assigned to dual classes.
Hydrologic Soil Group—Adams County Area, Parts of Adams and Denver Counties, Colorado LHM - Thornton
Natural ResourcesConservation Service
Web Soil SurveyNational Cooperative Soil Survey
12/26/2016Page 3 of 4
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Hydrologic Soil Group—Adams County Area, Parts of Adams and Denver Counties, Colorado LHM - Thornton
Natural ResourcesConservation Service
Web Soil SurveyNational Cooperative Soil Survey
12/26/2016Page 4 of 4
APPENDIX II - UTILITY PLAN
APPENDIX III - FEMA FLOOD MAP