CP 2018-10-30 (Special)City Council
City of Coppell, Texas
Meeting Agenda
255 E. Parkway Boulevard
Coppell, Texas
75019-9478
2nd Floor Conference Room6:00 PMTuesday, October 30, 2018
Special Called Work Session
KAREN HUNT CLIFF LONG
Mayor Mayor Pro Tem
BRIANNA HINOJOSA-SMITH NANCY YINGLING
Place 2 Place 5
WES MAYS BIJU MATHEW
Place 3 Place 6
GARY RODEN MARK HILL
Place 4 Place 7
MIKE LAND
City Manager
Notice is hereby given that the City Council of the City of Coppell, Texas will meet in Special
Called Work Session at 6:00 p.m. to be held in the 2nd Floor Conference Room at Town
Center, 255 Parkway Boulevard, Coppell, Texas.
As authorized by Section 551.071(2) of the Texas Government Code, this meeting may be
convened into closed Executive Session for the purpose of seeking confidential legal advice
from the City Attorney on any agenda item listed herein.
The City of Coppell reserves the right to reconvene, recess or realign the Work Session or
called Executive Session or order of business at any time prior to adjournment.
The purpose of the meeting is to consider the following items:
I.Call to Order
II.Work Session (Open to the Public) 2nd Floor Conference Room
A.Discussion regarding the DART Cotton Belt Line.
B.Discussion regarding Homestead Exemptions.
C.Discussion regarding Our Home, Our Decisions.
DART Memo 10-30-18.pdfAttachments:
Page 1 City of Coppell, Texas Printed on 10/30/2018
October 30, 2018City Council Meeting Agenda
City of Coppell Acoustical Reports.pdf
Our Home, Our Decisions Memo.pdf
Homestead Exemption Memo.pdf
Adjournment
________________________
Karen Selbo Hunt, Mayor
CERTIFICATE
I certify that the above Notice of Meeting was posted on the bulletin board at the City Hall of
the City of Coppell, Texas on this ______th day of _________, 20__, at _____________.
______________________________
Christel Pettinos, City Secretary
PUBLIC NOTICE - STATEMENT FOR ADA COMPLIANCE AND OPEN CARRY LEGISLATION
The City of Coppell acknowledges its responsibility to comply with the Americans With
Disabilities Act of 1990. Thus, in order to assist individuals with disabilities who require
special services (i.e. sign interpretative services, alternative audio/visual devices, and
amanuenses) for participation in or access to the City of Coppell sponsored public programs,
services and/or meetings, the City requests that individuals makes requests for these
services forty-eight (48) hours ahead of the scheduled program, service, and/or meeting. To
make arrangements, contact Kori Konon, ADA Coordinator or other designated official at (972)
462-0022, or (TDD 1-800-RELAY, TX 1-800-735-2989).
Pursuant to Section 30.06, Penal Code (trespass by license holder with a concealed handgun),
a person licensed under Subchapter H, Chapter 411, Government Code (handgun licensing
law), may not enter this property with a concealed handgun.
Pursuant to Section 30.07, Penal Code (trespass by license holder with an openly carried
handgun), a person licensed under Subchapter H, Chapter 411, Government Code (handgun
licensing law), may not enter this property with a handgun that is carried openly.
Page 2 City of Coppell, Texas Printed on 10/30/2018
Master
City of Coppell, Texas 255 E. Parkway Boulevard
Coppell, Texas
75019-9478
File Number: 2018-4246
File ID: Type: Status: 2018-4246 Agenda Item Agenda Ready
1Version: Reference: In Control: City Council
10/25/2018File Created:
Final Action: Work Session - 10/30File Name:
Title: A.Discussion regarding the DART Cotton Belt Line.
B.Discussion regarding Homestead Exemptions.
C.Discussion regarding Our Home, Our Decisions.
Notes:
Sponsors: Enactment Date:
DART Memo 10-30-18.pdf, City of Coppell Acoustical
Reports.pdf, Our Home, Our Decisions Memo.pdf,
Homestead Exemption Memo.pdf
Attachments: Enactment Number:
Hearing Date: Contact:
Effective Date: Drafter:
History of Legislative File
Action: Result: Return
Date:
Due Date: Sent To: Date: Acting Body: Ver-
sion:
1 10/30/2018City Council
Text of Legislative File 2018-4246
Title
A.Discussion regarding the DART Cotton Belt Line.
B.Discussion regarding Homestead Exemptions.
C.Discussion regarding Our Home, Our Decisions.
Summary
Page 1City of Coppell, Texas Printed on 10/30/2018
1
MEMORANDUM
To: Mayor and City Council
Through: Mike Land, City Manager
From: Traci E. Leach, Deputy City Manager
Date: October 30, 2018
Reference: DART Cotton Belt Noise Mitigation Follow up
2030: Goal 5 states “Easy access to Dallas-Fort Worth Region” with the following
objectives; Objective 1 – Participate in regional rail service to Dallas-Fort Worth,
Objective 2- Maintain and enhance accessibility to DFW Airport, and Objective 5 –
Develop regional connections for Coppell residents and employees of Coppell
businesses
Introduction:
At the July 31, 2018 workshop, staff presented information related to the DEIS and sound wall
locations and preliminary cost ranges. At that time, the Council directed staff to move forward with
an independent sound mitigation study to determine the efficacy of the potential sound walls. DP
Ayyappan with dp(A) Acoustics was engaged to perform this work. The consultant is here tonight to
review the findings of the report with the Council.
City staff will also be discussing the approved betterments budget for Coppell, future maintenance of
any sound walls, and design considerations in preparation for the anticipated Cotton Belt trail.
Background:
The draft Environment Impact Study (DEIS) outlined the required mitigation for the project for the
Cotton Belt corridor. While there were some improvements identified for Coppell (quiet zones, a
grade separation, and signal improvements), there were no sound walls recommended for any stretch
of rail through Coppell.
Council is evaluating the feasibility and effectiveness of the walls to provide relief to the adjacent
residents. There are two primary areas that are under evaluation- the stretch rail east of MacArthur
Blvd and extending to Fairway Drive and the stretch of rail west of MacArthur and extending just
west of Mockingbird. The mitigation study will help provide clarity regarding how effective the walls
2
would be in mitigating the sound of the train, based on readings that more accurately reflect the sound
level one would experience as the train travels by (not a hourly average).
Any sound walls constructed would be done at Coppell’s sole cost.
Analysis: The consultant will provide information related the analysis of the sound study.
Legal: N/A.
Fiscal Impact: Undetermined.
Recommendation: This is a discussion briefing and no action is required.
October 25, 2018
City of Coppell
255 E. Parkway Blvd., P.O. Box 9478
Coppell, TX 75019
Attention: Traci Leach -Deputy City Manager
RE: Sound Reading in Old Town Coppell
SUB: Environmental Noise Study
Dear Ms. Leach:
This report summarizes the environmental noise study that was performed in the
Old Town Coppell.
This report is divided into three (3) sections:
• Section I lists the scope of the study,
• Section II describes the field noise measurements,
• Section II discusses the results from the field noise measurements,
Section I
Scope of the Study
A The scope was to perform field noise measurements in the Old Town Coppell
at 505 Burns Street (the site) to document the ambient noise levels.
dP(A) Acoustics, Inc.
a 12160 Abrams Road,
Suite 621
Dallas, Texas 75243
v 972 644 2130
w www.dpaacoustics.net
e dp@dpaacoustics.net
Section II
The Field Noise Measurements
A Sketch SK-1 shows the site location and the D/FW International Airport;
the distance between the site and the airport is about six (6) miles.
The site is in the flight path. Sketch SK-2 shows the detailed location of
the site and the nearby streets and building of interest.
B The noise sources at the site during the measurements were:
1 The roadway noise from the automobile traffic on Burns Street,
Hammond Street and Travis Street.
2 The aircraft noise from the operations at the D/FW International
Airport.
3 The automobile noise from the freezer trucks at the warehouse
building located South of Burns Street.
The railroad located South of Burns Street was not active.
B The noise measurements were performed on Friday, October 5 2018
in the evening between 6:06 PM and 7:09 PM. The weather was nice
with no rain, and the wind speed was less than 10 MPH. The sound analyzer,
Larsen Davis SoundExpert LXT fitted with a Type-1 microphone was placed
on a tripod (at a height of about 5’) and located in the middle of the site.
The microphone was calibrated. The analyzer was programmed to perform
1-minute Leq measurements.
The acoustical terms are explained in the attachment.
Sound Reading in Old Town Coppell
Environmental Noise Study
October 25, 2018
Page 2 of 3
dP(A) Acoustics, Inc.
Sound Reading in Old Town Coppell
Environmental Noise Study
October 25, 2018
Page 3 of 3
dP(A) Acoustics, Inc.
Section III
The Results
A The attached Measurement Report show the results for various acoustical
descriptors which includes Leq (also known as LAeq).
B Per the measurement the resulting value for Leq is 63.1 dB(A).
Sincerely,
DP Ayyappan
President
DPA
Attachments: 1. Sketch SK-1 and Sketch SK-2
2. Measurement Report
3. Acoustical Terms
dP(A) Acoustics, Inc.
505 Burns Street
Dallas / Fort Worth
International Airport
Coppell
Sound Reading in Old Town Coppell
Environmental Noise Study October 25, 2018 • Sketch SK-1
Map showing the 505 Burns Street (the Site) and
the D/FW International Airport
Scale: None
dP(A) Acoustics, Inc.
NORTH
Burns Street S Coppell RoadTravis Street
Hammond Street505 Burns Street
Warehouse with Freezer Trucks
Area of
Noise Measurements
Freight Railroad
Sound Reading in Old Town Coppell
Environmental Noise Study October 25, 2018 • Sketch SK-2
Map showing the 505 Burns Street (the Site) and
the nearby Streets, Railroad & Buildings
Scale: None
dP(A) Acoustics, Inc.
NORTH
Measurement Report
Report Summary
Meter's File Name LxT_Data.072 Computer's File Name SLM_0004860_LxT_Data_072.00.ldbin
Meter LxT SE 0004860
Firmware 2.301
User Location
Description
Note
Start Time 2018-10-05 18:06:28 Duration 1:03:15.4
End Time 2018-10-05 19:09:44 Run Time 1:03:15.4 Pause Time 0:00:00.0
Results
Overall Metrics
LAeq 63.1 dB
LAE 98.9 dB SEA --- dB
EA 864.5 µPa²h
LApeak 92.6 dB 2018-10-05 18:34:05
LASmax 78.3 dB 2018-10-05 18:34:05
LASmin 47.6 dB 2018-10-05 18:19:36
LAeq 63.1 dB
LCeq 72.5 dB LCeq - LA eq 9.3 dB
LAI eq 64.8 dB LAI eq - LA eq 1.7 dB
Exceedances Count Duration
LAS > 85.0 dB 0 0:00:00.0
LAS > 115.0 dB 0 0:00:00.0
LApeak > 135.0 dB 0 0:00:00.0
LApeak > 137.0 dB 0 0:00:00.0
LApeak > 140.0 dB 0 0:00:00.0
Community Noise LDN LDay LNight
63.1 dB 63.1 dB 0.0 dB
LDEN LDay LEve LNight
63.1 dB --- dB 63.1 dB --- dB
Any Data A C Z
Level Time Stamp Level Time Stamp Level Time Stamp
Leq 63.1 dB 72.5 dB --- dB
Ls(max)78.3 dB 2018-10-05 18:34:05 --- dB --- dB
LS(min)47.6 dB 2018-10-05 18:19:36 --- dB --- dB
LPeak(max)92.6 dB 2018-10-05 18:34:05 --- dB --- dB
Overloads Count Duration
0 0:00:00.0
Statistics
LAS 5.0 70.9 dB
LAS 10.0 66.6 dB
LAS 33.3 57.2 dB
LAS 50.0 53.5 dB
LAS 66.6 51.2 dB
LAS 90.0 49.7 dB
October 25, 2018
City of Coppell
255 E. Parkway Blvd., P.O. Box 9478
Coppell, TX 75019
Attention: Traci Leach -Deputy City Manager
RE: DCTA/A-Train Sound Reading
SUB: Environmental Noise Study
Dear Ms. Leach:
This report summarizes the environmental noise study that was performed near the
Old Town Station in Lewisville, Texas.
This report is divided into three (3) sections:
• Section I lists the scope of the study,
• Section II describes the field noise measurements,
• Section II discusses the results from the field noise measurements,
Section I
Scope of the Study
A The scope was to perform field noise measurements of the A-Train
operation to get an idea of the anticipated noise from the proposed DART
Cotton Belt Line.
dP(A) Acoustics, Inc.
a 12160 Abrams Road,
Suite 621
Dallas, Texas 75243
v 972 644 2130
w www.dpaacoustics.net
e dp@dpaacoustics.net
Section II
The Field Noise Measurements
A Sketch SK-1 shows the location of the measurements, Old Town Station
and the nearby streets.
B The noise sources at the site during the measurements were:
1 The railroad noise from A-Train operation, chimes at the railroad
crossings.
2 The roadway noise from the automobile traffic on E College Street,
and S Railroad Street.
3 Occasional aircraft fly-over noise.
C The noise measurements were performed on Thursday, October 11 2018
in the evening between 5:07 PM and 5:53 PM. The weather was nice
with no rain, and the wind speed was less than 10 MPH. The sound analyzer,
Larsen Davis SoundExpert LXT fitted with a Type-1 microphone was placed
on a tripod (at a height of about 5’) and located at two (2) distances from
the railroad, 91’ and 100’. The microphone was calibrated. The analyzer was
programmed to perform 1-minute Leq measurements using the A-weighting
scale.
The acoustical terms are explained in the attachment.
DCTA/A-Train Sound Reading
Environmental Noise Study
October 25, 2018
Page 2 of 3
dP(A) Acoustics, Inc.
dP(A) Acoustics, Inc.
Section III
The Results
A The attached Measurement Reports show the results for various acoustical
descriptors which includes Leq (also known as LAeq).
B Per the measurements, the resulting values for Leq are:
1 57.7 dB(A) at the distance of 100’.
2 59 dB(A) at the distance of 91’.
Sincerely,
DP Ayyappan
President
DPA
Attachments: 1. Sketch SK-1
2. Measurement Reports
3. Acoustical Terms
dP(A) Acoustics, Inc.
DCTA/A-Train Sound Reading
Environmental Noise Study
October 25, 2018
Page 3 of 3
DCTA/A-Train Sound Reading
Environmental Noise Study October 25, 2018 • Sketch SK-1
Map showing the Old Town Station in Lewisville and
the nearby Streets
Scale: None dP(A) Acoustics, Inc.
NORTH
Old Town Station,
Lewisville, texas.
Area of
Noise Measurements
E College Street
Railroad for
A-Train
S Ra
i
lroad
Street
E Main Street
Measurement Report
Report Summary
Meter's File Name LxT_Data.078 Computer's File Name SLM_0004860_LxT_Data_078.00.ldbin
Meter LxT SE 0004860
Firmware 2.301
User Location
Description
Note
Start Time 2018-10-11 17:37:56 Duration 0:15:52.8
End Time 2018-10-11 17:53:49 Run Time 0:15:52.8 Pause Time 0:00:00.0
Results
Overall Metrics
LAeq 57.7 dB
LAE 87.5 dB SEA --- dB
EA 62.2 µPa²h
LApeak 90.7 dB 2018-10-11 17:40:44
LASmax 74.3 dB 2018-10-11 17:40:44
LASmin 47.2 dB 2018-10-11 17:43:32
LAeq 57.7 dB
LCeq 68.3 dB LCeq - LA eq 10.7 dB
LAI eq 61.0 dB LAI eq - LA eq 3.3 dB
Exceedances Count Duration
LAS > 85.0 dB 0 0:00:00.0
LAS > 115.0 dB 0 0:00:00.0
LApeak > 135.0 dB 0 0:00:00.0
LApeak > 137.0 dB 0 0:00:00.0
LApeak > 140.0 dB 0 0:00:00.0
Community Noise LDN LDay LNight
57.7 dB 57.7 dB 0.0 dB
LDEN LDay LEve LNight
57.7 dB --- dB 57.7 dB --- dB
Any Data A C Z
Level Time Stamp Level Time Stamp Level Time Stamp
Leq 57.7 dB 68.3 dB --- dB
Ls(max)74.3 dB 2018-10-11 17:40:44 --- dB --- dB
LS(min)47.2 dB 2018-10-11 17:43:32 --- dB --- dB
LPeak(max)90.7 dB 2018-10-11 17:40:44 --- dB --- dB
Overloads Count Duration
0 0:00:00.0
Statistics
LAS 5.0 62.0 dB
LAS 10.0 59.0 dB
LAS 33.3 55.6 dB
LAS 50.0 53.8 dB
LAS 66.6 51.8 dB
LAS 90.0 49.0 dB
Measurement Report
Report Summary
Meter's File Name LxT_Data.077 Computer's File Name SLM_0004860_LxT_Data_077.00.ldbin
Meter LxT SE 0004860
Firmware 2.301
User Location
Description
Note
Start Time 2018-10-11 17:07:51 Duration 0:26:21.9
End Time 2018-10-11 17:34:13 Run Time 0:26:21.9 Pause Time 0:00:00.0
Results
Overall Metrics
LAeq 59.0 dB
LAE 91.0 dB SEA --- dB
EA 139.9 µPa²h
LApeak 96.4 dB 2018-10-11 17:17:17
LASmax 85.1 dB 2018-10-11 17:17:17
LASmin 46.2 dB 2018-10-11 17:32:27
LAeq 59.0 dB
LCeq 68.6 dB LCeq - LA eq 9.6 dB
LAI eq 63.1 dB LAI eq - LA eq 4.1 dB
Exceedances Count Duration
LAS > 85.0 dB 1 0:00:00.7
LAS > 115.0 dB 0 0:00:00.0
LApeak > 135.0 dB 0 0:00:00.0
LApeak > 137.0 dB 0 0:00:00.0
LApeak > 140.0 dB 0 0:00:00.0
Community Noise LDN LDay LNight
59.0 dB 59.0 dB 0.0 dB
LDEN LDay LEve LNight
59.0 dB --- dB 59.0 dB --- dB
Any Data A C Z
Level Time Stamp Level Time Stamp Level Time Stamp
Leq 59.0 dB 68.6 dB --- dB
Ls(max)85.1 dB 2018-10-11 17:17:17 --- dB --- dB
LS(min)46.2 dB 2018-10-11 17:32:27 --- dB --- dB
LPeak(max)96.4 dB 2018-10-11 17:17:17 --- dB --- dB
Overloads Count Duration
0 0:00:00.0
Statistics
LAS 5.0 61.5 dB
LAS 10.0 59.7 dB
LAS 33.3 55.4 dB
LAS 50.0 53.2 dB
LAS 66.6 51.4 dB
LAS 90.0 48.3 dB
October 25, 2018
City of Coppell
255 E. Parkway Blvd., P.O. Box 9478
Coppell, TX 75019
Attention: Traci Leach -Deputy City Manager
RE: Sound Walls
SUB: Noise Study
Dear Ms. Leach:
This report summarizes the noise study that was performed for the anticipated sound
walls. This report is divided into three (3) sections:
• Section I lists the scope of the study,
• Section II describes the calculations for sound walls,
• Section II discusses the results from the calculations.
Section I
Scope of the Study
A The scope was to perform calculations to determine the noise attenuation
provided by the 12’ high and 15’ high sound walls for Segment A, Segment B
and Segment C.
dP(A) Acoustics, Inc.
a 12160 Abrams Road,
Suite 621
Dallas, Texas 75243
v 972 644 2130
w www.dpaacoustics.net
e dp@dpaacoustics.net
Section II
Calculations for Sound Walls
A The calculations were based on the noise barrier design recommended
by the US Department of Housing & Urban Development (HUD) in its
Noise Assessment Guidelines. The effectiveness of a sound wall depends on
the following:
1 Wall height, length and type
2 Height of the observer
3 Distance between the sound source and sound wall
4 Distance between the sound wall and the observer
The calculations were performed for each of the three (3) segments at the
mid-point and at the end-point of the proposed walls for the 12’ and 15’
heights.
B Sketch SK-1 through Sketch SK-3 show the three (3) segments along with
the mid-point and the end-point which were used in the calculations.
Sketch SK-4 shows the cross section, Section-1, of the railroad and the
sound wall. The elevations of the railroad, the ground of the sound wall
and the observer were considered to be the same. The height of the train
and the horizontal distance between the railroad and the sound wall were
obtained from DART. The horizontal distance between the sound wall and
the observer was established as 12’ for the calculations.
Sound Walls
Noise Study
October 25, 2018
Page 2 of 3
dP(A) Acoustics, Inc.
dP(A) Acoustics, Inc.
Section III
The Results
A The calculation sheets are attached to this report.
B Per the calculations, the noise attenuation provided by the solid walls
(made of 4” thick masonry units are given below):
Segment Noise Attenuation, dB
Wall Height Mid-Point End-Point
A 12’ 9.5 3
15’ 9.5 3
B 12’ 9.5 3
15’ 9.5 3
C 12’ 5 2
15’ 5 2
Sincerely,
DP Ayyappan
President
DPA
Attachments: 1. Sketch SK-1 through Sketch SK-4
2. Calculations
3. Acoustical Terms
dP(A) Acoustics, Inc.
Sound Walls
Noise Study
October 25, 2018
Page 3 of 3
Sound Walls
Noise Study October 25, 2018 • Sketch SK-1
Segment-A
Scale: None
dP(A) Acoustics, Inc.
NORTH
DART Cotton Belt Briefing A Family Community For A LifetimeJuly 31, 2018•Segment A: Riverchase Apartments–2,521 linear feet
–12’ wall: $1.6M to $2M
–15’ wall: $2.2M to $3M
–0.5 dB
2668’
Mid-Point
End-Point
End-Point
Railroad
Section 1
Sound Walls
Noise Study October 25, 2018 • Sketch SK-2
Segment-B
Scale: None
dP(A) Acoustics, Inc.
NORTH
DART Cotton Belt Briefing A Family Community For A LifetimeJuly 31, 2018•Segment B: Crestview (east of Mockingbird)
–1,874 linear feet
–12’ wall: $1.2M to $1.5M
–15’ wall: $1.6M to $2.2M
–1.6 dB
End-Point
1800’
Mid-Point
End-Point
Railroa
d
Section
1
Sound Walls
Noise Study October 25, 2018 • Sketch SK-3
Segment-C
Scale: None
dP(A) Acoustics, Inc.
NORTH
DART Cotton Belt Briefing A Family Community For A LifetimeJuly 31, 2018•Segment C: Crestview (west of Mockingbird)
–288 linear feet
–12’ wall: $193K to $235K
–15’ wall: $250K to $345K
–1.6 dB
Mid-Point
270’
End-Point
End-Point
Railroa
d
Section
1
Sound Walls
Noise Study October 25, 2018 • Sketch SK-4
Cross Section Detail-1
Scale: None
dP(A) Acoustics, Inc.
A train A train
15’ high sound wall, (H)
12’ high sound wall, (H)
5’ high observer, (O)
12’ (R)12’ (D)
14’ high
sound
source, (S)
12 12
14 12
5
12 14 -2
5 14 -9 24
12
-9 24 -0.4
-0.4 -0.4 0.2
0.2 0.1
0.1 0.9
-0.4 12 -5
-2 -5 3
3 0.9 3
-04 3 -1
12 0.9 13
13 -1 12
24 12 12
12 0.9 13
13 - -1 14
SEGMENT A at Mid-Point
with 12’ high Wall
Adjustment = 0 dB
Adjusted Barrrier Attenuation = 11 dB
SEGMENT A at Mid-Point
with 12’ High Barrier
SEGMENT A at Mid-Point
with 12’ high Wall
SEGMENT A at Mid-Point
with 12’ High Barrier
SEGMENT A at Mid-Point
with 12’ high Wall
12 12
14 12
5
12 14 -2
5 14 -9 24
12
-9 24 -0.4
-0.4 -0.4 0.2
0.2 0.1
0.1 0.9
-0.4 12 -5
-2 -5 3
3 0.9 3
-04 3 -1
12 0.9 13
13 -1 12
24 12 12
12 0.9 13
13 - -1 14
SEGMENT A at End-Point
with 12’ high Wall
Adjustment = 0 dB
Adjusted Barrrier Attenuation = 11 dB
SEGMENT A at End-Point
with 12’ High Barrier
SEGMENT A at End-Point
with 12’ high Wall
SEGMENT A at End-Point
with 12’ High Barrier
SEGMENT A at End-Point
with 12’ high Wall
15 12
14 12
5
15 14 1
5 14 -9 24
12
-9 24 -0.4
-0.4 -0.4 0.2
0.2 0.1
0.1 0.9
-0.4 12 -5
1 -5 6
6 0.9 5
-0.4 6 -2
12 0.9 13
13 -2 11
24 12 12
12 0.9 13
13 - -2 15
SEGMENT A at Mid-Point
with 15’ high Wall
Adjustment = -1 dB
Adjusted Barrrier Attenuation = 12 dB
SEGMENT A at Mid-Point
with 15’ High Barrier
SEGMENT A at Mid-Point
with 15’ high Wall
SEGMENT A at Mid-Point
with 15’ High Barrier
SEGMENT A at Mid-Point
with 15’ high Wall
15 12
14 12
5
15 14 1
5 14 -9 24
12
-9 24 -0.4
-0.4 -0.4 0.2
0.2 0.1
0.1 0.9
-0.4 12 -5
1 -5 6
6 0.9 5
-0.4 6 -2
12 0.9 13
13 -2 11
24 12 12
12 0.9 13
13 - -2 15
SEGMENT A at End-Point
with 15’ high Wall
Adjustment = -1 dB
Adjusted Barrrier Attenuation = 12 dB
SEGMENT A at End-Point
with 15’ High Barrier
SEGMENT A at End-Point
with 15’ high Wall
SEGMENT A at End-Point
with 15’ High Barrier
SEGMENT A at End-Point
with 15’ high Wall
12 12
14 12
5
12 14 -2
5 14 -9 24
12
-9 24 -0.4
-0.4 -0.4 0.2
0.2 0.1
0.1 0.9
-0.4 12 -5
-2 -5 3
3 0.9 3
-04 3 -1
12 0.9 13
13 -1 12
24 12 12
12 0.9 13
13 - -1 14
SEGMENT B at Mid-Point
with 12’ high Wall
Adjustment = 0 dB
Adjusted Barrrier Attenuation = 11 dB
SEGMENT B at Mid-Point
with 12’ High Barrier
SEGMENT B at Mid-Point
with 12’ high Wall
SEGMENT B at Mid-Point
with 12’ High Barrier
SEGMENT B at Mid-Point
with 12’ high Wall
12 12
14 12
5
12 14 -2
5 14 -9 24
12
-9 24 -0.4
-0.4 -0.4 0.2
0.2 0.1
0.1 0.9
-0.4 12 -5
-2 -5 3
3 0.9 3
-04 3 -1
12 0.9 13
13 -1 12
24 12 12
12 0.9 13
13 - -1 14
SEGMENT B at End-Point
with 12’ high Wall
Adjustment = 0 dB
Adjusted Barrrier Attenuation = 11 dB
SEGMENT B at End-Point
with 12’ High Barrier
SEGMENT B at End-Point
with 12’ high Wall
SEGMENT B at End-Point
with 12’ High Barrier
SEGMENT B at End-Point
with 12’ high Wall
15 12
14 12
5
15 14 1
5 14 -9 24
12
-9 24 -0.4
-0.4 -0.4 0.2
0.2 0.1
0.1 0.9
-0.4 12 -5
1 -5 6
6 0.9 5
-0.4 6 -2
12 0.9 13
13 -2 11
24 12 12
12 0.9 13
13 - -2 15
SEGMENT B at Mid-Point
with 15’ high Wall
Adjustment = -1 dB
Adjusted Barrrier Attenuation = 12 dB
SEGMENT B at Mid-Point
with 15’ High Barrier
SEGMENT B at Mid-Point
with 15’ high Wall
SEGMENT B at Mid-Point
with 15’ High Barrier
SEGMENT B at Mid-Point
with 15’ high Wall
15 12
14 12
5
15 14 1
5 14 -9 24
12
-9 24 -0.4
-0.4 -0.4 0.2
0.2 0.1
0.1 0.9
-0.4 12 -5
1 -5 6
6 0.9 5
-0.4 6 -2
12 0.9 13
13 -2 11
24 12 12
12 0.9 13
13 - -2 15
SEGMENT B at End-Point
with 15’ high Wall
Adjustment = -1 dB
Adjusted Barrrier Attenuation = 12 dB
SEGMENT B at End-Point
with 15’ High Barrier
SEGMENT B at End-Point
with 15’ high Wall
SEGMENT B at End-Point
with 15’ High Barrier
SEGMENT B at End-Point
with 15’ high Wall
12 12
14 12
5
12 14 -2
5 14 -9 24
12
-9 24 -0.4
-0.4 -0.4 0.2
0.2 0.1
0.1 0.9
-0.4 12 -5
-2 -5 3
3 0.9 3
-04 3 -1
12 0.9 13
13 -1 12
24 12 12
12 0.9 13
13 - -1 14
SEGMENT C at Mid-Point
with 12’ high Wall
Adjustment = 0 dB
Adjusted Barrrier Attenuation = 11 dB
SEGMENT C at Mid-Point
with 12’ High Barrier
SEGMENT C at Mid-Point
with 12’ high Wall
SEGMENT C at Mid-Point
with 12’ High Barrier
SEGMENT C at Mid-Point
with 12’ high Wall
12 12
14 12
5
12 14 -2
5 14 -9 24
12
-9 24 -0.4
-0.4 -0.4 0.2
0.2 0.1
0.1 0.9
-0.4 12 -5
-2 -5 3
3 0.9 3
-04 3 -1
12 0.9 13
13 -1 12
24 12 12
12 0.9 13
13 - -1 14
SEGMENT C at End-Point
with 12’ high Wall
Adjustment = 0 dB
Adjusted Barrrier Attenuation = 11 dB
SEGMENT C at End-Point
with 12’ High Barrier
SEGMENT C at End-Point
with 12’ high Wall
SEGMENT C at End-Point
with 12’ High Barrier
SEGMENT C at End-Point
with 12’ high Wall
15 12
14 12
5
15 14 1
5 14 -9 24
12
-9 24 -0.4
-0.4 -0.4 0.2
0.2 0.1
0.1 0.9
-0.4 12 -5
1 -5 6
6 0.9 5
-0.4 6 -2
12 0.9 13
13 -2 11
24 12 12
12 0.9 13
13 - -2 15
SEGMENT C at Mid-Point
with 15’ high Wall
Adjustment = -1 dB
Adjusted Barrrier Attenuation = 12 dB
SEGMENT C at Mid-Point
with 15’ High Barrier
SEGMENT C at Mid-Point
with 15’ high Wall
SEGMENT C at Mid-Point
with 15’ High Barrier
SEGMENT C at Mid-Point
with 15’ high Wall
15 12
14 12
5
15 14 1
5 14 -9 24
12
-9 24 -0.4
-0.4 -0.4 0.2
0.2 0.1
0.1 0.9
-0.4 12 -5
1 -5 6
6 0.9 5
-0.4 6 -2
12 0.9 13
13 -2 11
24 12 12
12 0.9 13
13 - -2 15
SEGMENT C at End-Point
with 15’ high Wall
Adjustment = -1 dB
Adjusted Barrrier Attenuation = 12 dB
SEGMENT C at End-Point
with 15’ High Barrier
SEGMENT C at End-Point
with 15’ high Wall
SEGMENT C at End-Point
with 15’ High Barrier
SEGMENT C at End-Point
with 15’ high Wall
ACOUSTICAL TERMS
Decibel [dB]
dP(A) Acoustics, Inc.
dB Power ratio Amplitude ratio
100 10 000 000 000 100 000
90 1 000 000 000 31 623
80 100 000 000 10 000
70 10 000 000 3 162
60 1 000 000 1 000
50 100 000 316 .2
40 10 000 100
30 1 000 31 .62
20 100 10
10 10 3 .162
6 3 .981 ≈ 4 1 .995 ≈ 2
3 1 .995 ≈ 2 1 .413 ≈ √2
1 1 .259 1 .122
0 1 1
−1 0 .794 0 .891
−3 0 .501 ≈ 1⁄2 0 .708 ≈ √1⁄2
−6 0 .251 ≈ 1⁄4 0 .501 ≈ 1⁄2
−10 0 .1 0 .316 2
−20 0 .01 0 .1
−30 0 .001 0 .031 62
−40 0 .000 1 0 .01
−50 0 .000 01 0 .003 162
−60 0 .000 001 0 .001
−70 0 .000 000 1 0 .000 316 2
−80 0 .000 000 01 0 .000 1
−90 0 .000 000 001 0 .000 031 62
−100 0 .000 000 000 1 0 .000 01
An example scale showing power ratios x, amplitude ratios √x ,
and dB equivalents 10 log10 x.
Decibel
The decibel (symbol: dB) is a unit of
measurement used to express the ratio of one
value of a physical property to another on a
logarithmic scale. It can be used to express a
change in value (e.g., +1 dB or −1 dB) or an
absolute value. In the latter case, it expresses
the ratio of a value to a reference value; when
used in this way, the decibel symbol should be
appended with a suffix that indicates the
reference value or some other property. For
example, if the reference value is 1 volt, then the
suffix is "V" (e.g., "20 dBV"), and if the reference
value is one milliwatt, then the suffix is "m"
(e.g., "20 dBm").[1]
There are two different scales used when
expressing a ratio in decibels depending on the
nature of the quantities: field, power, and root-
power. When expressing power quantities, the
number of decibels is ten times the logarithm to
base 10 of the ratio of two power quantities.[2]
That is, a change in power by a factor of 10
corresponds to a 10 dB change in level. When
expressing field quantities, a change in
amplitude by a factor of 10 corresponds to a
20 dB change in level. The extra factor of two is
due to the logarithm of the quadratic
relationship between power and amplitude. The
decibel scales differ so that direct comparisons
can be made between related power and field
quantities when they are expressed in decibels.
The definition of the decibel is based on the
measurement of power in telephony of the early
20th century in the Bell System in the United
States. One decibel is one tenth (deci-) of one
bel, named in honor of Alexander Graham Bell;
however, the bel is seldom used. Today, the
From the Web.
ACOUSTICAL TERMS
A-Weighted Sound Levels, dB(A)
dP(A) Acoustics, Inc.
From the book “Concepts in Architectural Acoustics” by David Egan
ACOUSTICAL TERMS
Leq, continuous equivalent sound level
dP(A) Acoustics, Inc.
From the book “Handbook of Environmental Acoustics” by James Cowan
THE•CITY•OF
COPPELL
MEMORANDUM
To: Mayor and Council
From: Mike Land, City Manager
Date: October 30, 2018
Reference: Our Home Our Decision Discussion
Per the Council's most recent discussion on this program and the opportunity to share issues with
the community the following list of service organizations and their meeting times is provided. If
there are others that you may have an interest in presenting to please contact us with their
information so that we can add the group to the list. There will be an opportunity Tuesday evening
for the City Council to determine who if any has a desire to request some speaking time before
any of these groups.
Assistance League of Coppell
• Meet third Thursday of every month
• Next speaker opening available: February 21, 2019
o Social hour 9:30-10
o Speaker at 10, keep it to 20 minutes
Coppell Chamber of Commerce
• Mayor scheduled to speak in January (State of the City)
• Legislative Summit -December 13
Coppell Education Foundation
• November 6 -CEF night at J. Macklin's
• November 13 -CEF Night at Newk's
Coppell Lion's Club
• Meets first and third Monday, 7 pm
Coppell Women's Club
• First Wednesday of each month (during academic year)
o November 7 -general meeting
o November 12-walking group
o November 14 -lunch brunch
o November 19 -walking group
o November 21-board meeting
o November 26-walking group
o December 3 -walking group
o December 5 -holiday lunch
o December 10, 17, 24, 31-walking group
o January 16 -board meeting
Defenders of Freedom
• February 21-an evening with Patriots Dinner Series
o http://defendersoffreedom.us/news/22/save-the-dates-and-up-coming-events
Rotary Club
• Meets first and third Tuesdays
o November 1
o November 9 -board meeting
o November 15
o December 6
o December 14 -board meeting
o December 20
THE•CITY•OF
COPPELL
MEMORANDUM
To: Mayor and Council
From: Mike Land, City Manager
Date: October 30, 2018
Reference: Homestead Exemption discussion
Per the Council's most recent discussion on this subject in July I am attaching the previously
provided spreadsheet for your review and consideration.
The attached spreadsheet highlights:
I. Total Property Value
2. Total Exemptions
3. Taxable Value
4. Tax Rate
5. Property Tax Revenue
6. Total General Fund Expenditures
7. Population
8. General Fund Per Capita Expenditures
Senior and Disabled Exemption
Regarding Senior and Disabled exemptions, since fiscal year 1 7 /18, the number of persons
qualifying and taking the exemption has increased by 138. The total taking the exemption is
now 2,038 or approximately 14% of the City's housing stock. If the Council chose to increase
these exemptions from $75k to 80K, the City's tax revenue would decrease by $59,000. If the
increase was from $75K to 100K, the City's tax revenue would decrease $295,000.
I ,.
Homestead Exemption in general compared to a tax rate reduction
For every 1 % increase in the general homestead exemption, the City receives $225,000 less in
property tax revenue. Therefore every 5% increase in the homestead exemption decreases the
City's property tax revenue by $1.125 million. Every penny reduction in the tax rate decreases
the City's property tax revenue by $760,000.
For illustrative purposes only for an average valued home, a 1 % reduction in the homestead
exemption results in a $22 savings, a 1 cent reduction tax rate equates to a $36 savings. (using
the existing tax rate as the starting point.) With every 5% increase in the homestead exemption,
the average savings would be $110 for the homeowner (no businesses would benefit from this
increased exemption.) To obtain that same savings for the homeowner, the tax rate would need
to be reduced 3 cents. In either scenario there is a reduction in revenue to the City for operations
and maintenance with the potential compounding of reducing the City's capacity to issue the
necessary debt to cover future projects such as the reconstruction of Belt Line. Lowering the tax
rate would be an actual overall reduction in revenue for the City of approximately $2.3 million as
opposed to the $1.125 million if just the exemption were increased by 5%.
City of Coppell 5 Year Property Tax Exemption and Per Capita Analysis Property Tax Total General Fund GF Per Capita Year Property Value Exemptions Taxable Value Tax Rate Revenue Expenditures Population Expenditures 2013 $ 5,999,724,154.00 $ 1,026,098,908.00 $ 4,973,625,246.00 $ 0.670460 $ 33,346,168 $ 46,129,158.00 39,380 $ 1,171.39 2014 $ 6,371,435,777.00 $ 1,141,506,756.00 $ 5,229,929,021.00 $ 0.637500 $ 33,340,798 s 46,820,635.00 39,550 $ 1,183.83 2015 $ 6,961,134,340.00 $ 1,283,852,315.00 $ 5,677,282,025.00 $ 0.606490 s 34,432,148 $ 48,711,123.00 39,880 $ 1,221.44 2016 $ 7,782,210,191.00 $ 1,551,493,766.00 $ 6,230,716,425.00 $ 0.584000 $ 36,387,384 $ 51,555,264.00 40,310 $ 1,278.97 2017 $ 8,463,241,848.00 $ 1,750,009,813.00 $ 6,713,232,035.00 $ 0.579500 $ 38,903,180 $ 53,829,867.00 40,820 $ 1,318.71 Average Annual Percent Increase 10.27% 17.64% 8.74% -3.39% 4,17% 4.17% 0.91% 3.14% Total Increase 41.06% 70.55% 34.98% -13.57% 16.66% 16.69% 3.66% 12.58% 7/21/2018 '''""'~,.,•~-,,,-.,,,,~l'T'-<"=""l""''"""'-~--'\'~'-=---,~:"'!-.,."'"""?l'.'!"'f...,,~"',--.~~"'f""""!'!:"-.-"1-~---\Y>e'~"'---':>-,...·P. ''""" ' ',-., .,~,,, ... ,.,_-,,.,.,,_,,. 4"1!'(~.o<!'.,,...,..~'N"..,,..,W'P!,":<'.~.---=-,,.,,.,,.., .... .,...,.,,AW"1"""""-"'~,,,,,,,,;,..,.,,.,..._.,,,,.,a_.,,..,.,,,.., ... .,,_,,,,,..,...-='!',,_-,,,,,"'""'_