ST0501-CS090428Page 1 of 1
Keith Marvin - Drainage Memo
From: "DeGroot, Dan" <ddegroot @burnip.com>
To: DiWanna Baskins <dbaskins @ci.coppell.tx.us >,
"kmarvin @ci.coppell.tx.us" <kmarvin @ci.coppell.tx.us>
Date: 4/28/2009 11:54 AM
Subject: Drainage Memo
Attachments: Drainage Memo and Exhibits.pdf
Keith /Diwanna
Here is the drainage memo that you requested. I have not included any costs or time for permitting or map
revisions. Please call with comments after you have had a chance to review, thanks.
Lowell D. DeGroot, P. E.
Senior Project Manager
GSWW, A Division of Burgess & Niple, Inc.
11117 Shady Trail
Dallas, Texas 75229
972.620.1255 Ext. 216
Note:
These electronic documents are provided by Burgess & Niple (B &N) as a convenience to our clients.
The official document is available as a manually signed, initialed, or sealed hard copy. If there is a discrepancy
between electronic files and the hard copies, the hard copies shall prevail.
It is our professional opinion that this electronic information provides information current as of the date of its
release. Any use of this information is at the sole risk and liability of the user. The user is responsible for updating
information to reflect any changes in the information following the preparation date of this transmittal.
The delivery of this information in electronic format is for the benefit of the owner for whom the services have
been performed. Nothing in the transfer should be construed to provide any right to third parties to rely on the
information provided, or that the use of this information implies the review and approval of Burgess & Niple.
file: HC: \Documents and Settings \radloo \Local Settings\ Temp \XPgrpwise \49F6EE67City_of... 3/4/2010
■■ Engineers ■ Planners
■■ SWW
Adivision of BURGESS & NIPLE
TO: Mr. Keith Marvin, P.E. — City of Coppell Engineering
Ms. DiWanna Baskins — City of Coppell Engineering
FROM: Lowell D. DeGroot, P.E.
DATE: April 28, 2009
SUBJECT: Drainage improvements east side of project
MEMORANDUM
Keith / DiWanna:
Since the inception of this project we have had an issue with respect to the hydraulic grade line
of the proposed drainage system on the eastern end of the project. The existing system that
was constructed with the development of DeForest Court and Windsor Estates was designed
for longer times of concentration and split flow situations where water flowed off the roadway
and abutting properties into ditches. By constructing a new concrete curbed street with
sidewalks on both sides, we now have increased our runoff and decreased our time of
concentration for the system. Both the added runoff and decreased concentration time
increase the hydraulic grade line to be out of the pavement surface.
We have identified two options to allow for drainage of the storm water that would decrease the
hydraulic gradient for the system. With both options I have included a probable construction
cost and associated engineering fee for the design. The two options are as follows:
1) A parallel 36" storm sewer pipe along the existing 36" storm sewer that would
essentially start at Allen road and eventually pipe into Denton Creek. (See Exhibit 1)
2) Divert a portion of the flow from the system along the western edge of the Nettie Long
Addition (Watts property) to a pond in the back of the Watts property. (See Exhibit 2)
As you are aware, the original scope for the design of Deforest Road did not include
engineering services to analyze or design a storm sewer system for the eastern end of the
project. During the contract negotiations, drainage analysis and design was removed from the
contract by the City with the assumption that the piping system that was installed with the
Deforest Court and Windsor Estates developments could adequately handle the flows.
Currently we have put an additional 200 hours in the analysis and design of the existing storm
sewer system and proposed system to compensate for the additional runoff and decreased
time of concentration of the drainage area.
Along with the design of the new system we are asking that GSWW be compensated for the
additional hours spent on drainage analysis and design to this point.
11117 Shady Trail ■ Dallas, Texas 75229 w 972.620.1255
GSWW, Division Burgess & Niple, Inc.
11117 Shady Trail Fa • D allas, 75229
I
972.620.1255..1255. 97972.620.8028 Fax
■■
& NIPLE
OPINION OF PROBABLE COST
OWNER: City of Coppell, Texas
Job # 39413
DATE: 4/22/2009
PREPARED BY: LDD
PROJECT: DeFOREST ROAD RECONSTRUCTION
Cost Estimate for Exhibit #1, Drainage Improvements for East Edge of Project
ITEM NO
DESCRIPTION OF UNIT
UNIT
UNIT
PRICE
UNIT
QUANTITY
TOTAL
UNIT
PRICE
CONSTRUCTION COST EXHIBIT #1
1 TYPE "I" STORM SEWER INLET WITH TWO EXTENSIONS
$3,250.00
6
$19,500.00
2 TYPE "I" STORM SEWER INLET WITH ONE EXTENSION
$2,750.00
2
$5,500.00
3 CONNECTTO EXISTING STORM SEWER PIPE
$500.00
2
$1,000.00
4 OUTFALL STRUCTURE TO DENTON CREEK
$5,000.00
1
$5,000.00
5 5' STORM SEWER MANHOLE
$5,000.00
1
$5,000.00
6 18" REINFORCED CONCRETE STROM SEWER PIPE
7 24" REINFORCED CONCRETE STROM SEWER PIPE
8 36" REINFORCED CONCRETE STROM SEWER PIPE
$65.00
425
$27,625.00
$8,625.00
$128,500.00
$75.00
115
$100.00
12$5
9 10" SCHEDULE 40 PVC. DRAINAGE PIPE
$25.00
25
$625.00
10. SLOTTED DRAIN
$50.00
112
$5,600.00
SUBTOTAL $206,975.00
ENGINEERING EXHIBIT #1
HOURLY RATE HOURS TOTAL
A. BASIC SERVICES
A•1 SCHEMATIC DESIGN (includes prior drainage analysis and design)
$.140.00
200
$28,000.00
B -1 PRELIMINARY DESIGN
$140.00
160
$22,400.00
C -1 FINAL DESIGN
$140.00
40
$5,600.00
E -5 TOPOGRAPHIC SURVEY (plus 10 %)
E£ EASEMENT EXHIBITS (MAX 2 AT $600 EACH)
$4,815.00
$1,200.00
SUBTOTAL $62,015.00
EXLUSSONS:
a. HEC II & Hydraulic Studies
b. Detention Pond Analysis
c. Environmental Investigation
d. Drainage Permitting / Map Revisions
In providing opinions of probable construction cost, the client understands that the Consultant has no control over the cost or
availability of tabor, equipment or materials, or over market conditions or the Contractor's method of pacing, and that the
consultant's opinions of probable construction cost are made on the basis of the consultant's professional judgment. and
e enence. The Consultant makes no warranty, express or implied, that the bids or the negotiated cast of the Work will not vary
from the consultants opinion of probable construction cost.
GSWW, Division Burgess & 2
I Inc.
11117 Shady Trail Fa • D allas, 75229
29
972.620.1255..1255. 97972.620.8028 Fax
■■
& NIPLE
OPINION OF PROBABLE COST
OWNER: City of Coppell, Texas
Job # 39413
DATE: 4/22/2009
PREPARED BY: LDD
PROJECT: DeFOREST ROAD RECONSTRUCTION
Cost Estimate for Exhibit #2, Drainage Improvements for East Edge of Project
ITEM NO
DESCRIPTION OF UNIT
UNIT
UNIT
PRICE
UNIT
QUANTITY
TOTAL
UNIT
PRICE
CONSTRUCTION COST EXHIBIT #2
1 TYPE "1" STORM SEWER INLET WITH TWO EXTENSIONS
$3,250.00
6
$19,500.00
2 TYPE "1" STORM SEWER INLET WITH ONE EXTENSION
$2,750.00
2
$5,500.00
3 CONNECT TO EXISTING STORM SEWER PIPE
$500.00
2
$1,000.00
4 OLrrFALL STRUCTURE TO EXISTING POND
$3,000.00
1
$3,000.00
5 POND OVERFLOW STRUCTURE AND OUTFALL TO DENTON CREEK
$5,000.00
1.
$5,000.00
5 4' STORM SEWER MANHOLE
6 18" REINFORCED CONCRETE STROM SEWER PIPE
7 24" REINFORCED CONCRETE STROM SEWER PIPE
$4,000.00
1.
$4,000.00
$27;625.00
$65.00
425
$75.00
'130
$9,750.00
8 30" REINFORCED CONCRETE STROM SEWER PIPE
$95.00.
570
$54,150.00
9 10" SCHEDULE 40 PVC DRAINAGE PIPE
$25.00
25
$625.00
10. SLOTTED DRAIN
$50.00
112
$5 ; 600:00
TOTAL $135,750.00
ENGINEERING EXHIBIT #2
HOURLY RATE HOURS TOTAL
A. BASIC SERVICES
A -1 SCHEMATIC DESIGN (includes prior drainage analysis and design)
$140.00
200
$28,000.00
B -1 PRELIMINARY DESIGN
$140.00
$140.00
160
40
$22,400.00
$5,600.00
$6,625.00
C -1 FINAL DESIGN
E -5 TOPOGRAPHIC SURVEY (plus 10 %)
E-6 EASEMENT EXHIBITS (MAX 2 AT $600 EACH)
$1,200.00
TOTAL $63,825.00
EXLUSSONS:
a. HEC II & Hydraulic Studies
to. Detention Pond Analysis
c. Environmental Investigation
d. Drainage Permitting / Map Revisions
In providing opinions of probable construction cost, the client understands that the consultant has no control over the cost or
availability of labor, equipment or materials, or over market oondltigns or the Contractor's method of pacing, and that the
consultant's opinions of probable construction cast are made on the basis of the consultant's professional judgment and
e,penence. The Consultant makes no warranty, express or implied, that the bids or the negotiated onst of the Work will not vary
from the Consultant's opinion of probable construction cost.
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