ST8402-CS 890525GINN, INC.
May 25, 1989
Dallas Water Utilities
Engineering Department
320 E. Jefferson, Rm. 211
Dallas, Texas 75203
CONSUL'
FING ENGINEERS
Attention: Mr. T. W. Stewart, Manager - Water & Sewer Design
Re: Denton Tap Road Improvements from Sandy Lake Road to Denton
Creek, Coppell, Texas.
Dear Mr. Stewart:
We are writing this letter as the Project Engineer representing
the City of Coppell on the above captioned project. On May 19,
1989 we received a Proposal from L. H. Lacy Co. for alleviating
the conflict identified in our December 22, 1988 letter, between
the Dallas Water Utilities 30" water line and the proposed paving
subgrade and storm sewer lateral D-22. Copies of this Proposal
were sent to Mr. Tony Almeida and Mr. Steve Hardy of Dallas Water
Utilities without the knowledge of the City of Coppell or Ginn,
Inc. Consulting Engineers.
L. H. Lacy Co.'s Proposal is being reviewed by our office and has
been found to contain some technical errors. In principle,
however, it appears possible that the conflict with the subgrade
can be alleviated by removal of some existing pavement and
revision of the proposed paving grades to the extent that the
cover between the top of the 30" pipe and the bottom of the
pavement may be as much as 1.92 feet.
Before giving this Proposal further consideration we must ask for
Dallas Water Utilities' written comments regarding their
acceptability and willingness to perform maintenance and
operation of this transmission line which will have to bear HS-20
highway traffic loadings transmitted through 8" of 3000 psi
reinforced concrete pavement constructed on a 6" Lime Treated
Subgrade and approximately 1'-5" of compacted earth.
L. H. Lacy Co.'s Proposal also contains a reference to the
shallow cover over the subject water line in the neighborhood of
Station 185+00 as addressed in your August 26, 1987 letter to our
firm. If it is your desire to reconsider this item, please
inform us of your intentions.
17103 Preston Road · Suite 100 · LB 118 · Dallas, Texas 75248 · Phone 214/248-4900
Upon receipt of your written response, we will continue our
evaluation of L.H. Lacy Co.'s proposal.
Please reply as soon as practical in order to minimize delay of
construction of this City of coppell Capital Improvement Project.
We thank you for your cooperation on this project.
Please call me if you have any questions.
Sincerely,
John C. Karlsruher, P.
Project Engineer
enclosures
cc:
Russell Doyle, P.E., city Engineer
H. Wayne Ginn, P.E.
Scott Balch, P.E.- L. H. Lacy Co.
Ron McAvoy - L. H. Lacy Co.
A. V. Almeida - Dallas Water Utilities
Steve Hardy - Dallas Water Utilities
Mike Parsley - Dallas Water Utilities
Randy Fleming
File J - 379 (a:525dwu)
MAY 15. 1~88
GINN. INC., CONSULTING ENGINEERS
17105 PRESTON ROAD
SUITE 100, LB-118
DALLAS~ TEXAS 75248
ATTN: JOHN C. KARLSRUHER. P.E.
RE:
DENTON TAP ROAD IMPROVEMEN[S FROM SANDY LAKE TO DENTON CREEK (579>
PROPOSED ROADWAY GRADES FOR NORTHBOUND LANES FROM STATION 1~+00 TO
1~+75 TO ALLEVIATE INTERFERRENCES WiTH CITY OF DALLAS 50" WATER
LINE IN THE SUBGRADE AND LATERAL D-22
DEAR JOHN?
ATTACHED FIND COPIES OF I_. iH. LACY CO'S PROPOSAL TO HELP SOLt/E THE
INTERFERRENCE WITH THE ABOVE REFERRENCED CITY DF DALLAS WATER LINE.
THE L. H. LACY CO. HAS MADE ]-HE FOLLOWING LOGICAL ASSUMPTION IN
PROPOSING '[HIS SOLUTION:
1>
THE CHANGING OF THE ROADWAY GRADES IN THE ABOVE REFERRENCED
LIMITS WILL NOT CHANGE THE DRAINAGE AREA THAT WAS ORIGINALLY
DESIGNED TO BE DRAINED BY LATERAL D-22
THE ACCEPTANCE OF THIS ASSUMPTION WOULD INDICATE THE FOLLOWING TO
ALSO BE LOGICAL FOR AN INLE~ PLACED ON THE EAST MEDIAN CURB:
1> THE DESIGNATED INLET TYPE AT LATERAL D-22 WILL STILL BE VALID
2) THE DESIGNATED LATERAL PIPE SIZ~ FOR D-22 WILL STILL BE VALID
THE POSITIVE DIFFERENCE (*.b~') IN CURB HEIGHT FOR INLET D-22 ASSURES
THAT WE CAN PROVIDE ADEQUATE FALL TO THE EXISTING 4X5 R.C.S.C. WE
WILL SE DRAINING INTO.
THE ADDITIONAL CLEARANCE iS GAINED BY REDESIGNING THE ROADWAY GRADES
FROM EXISTING STATION 1~+00 (INSTEAD OF 1~+58). THIS GIVES MORE
DISTANCE TO EFFECT A CHANGE IN GRADE. RLEASE NOTE THAT IN REFERRENCE
TO COVER OVER THE 50" WATER LINE - AT STATION 185~00 'THE 50" WATER
LINE HAS APPROXIMATELY 2' OF DESIGN COVER NEAR THIS STATION.
L H. Lacy Company
General Contractors
214/357-0146
'Quality Construction fo~ over 65 Years'
10888 Shady Trail
P.O. Box 541297
Dallas, Texas 75354-1297
THE L. H. LACY CO. BEL1EVES THIS PROPOSAL HAS EXCELLENT MERI1. AND
THAT )l WARRANTS CLOSE CONSIDERATION. IF YOU HAVE ANY QUES1]ONS PLEASE
GIVE ME A CALL.
RESPECTFULLY SUBMITTED,
CC:
ENC:
SCOTT BALCH. P.E.. L. H. LACY CO., PROJEC1 MANAGER
FILE 510 CORRESPONDENCE
TONY ALAMEDA. CITY OF DALLAS PUBLIC WORKS
STEVE HARDY, CITY OF DALLAS WATER & SEWER D~S1GN
ONE tl> COPY OF SL!F~VEY NO]~S [)P E~.IS]IN~ DEN~[)N lAP ~r ~ c ~
ONE (i) COPY EACH O~ MAR~<ED-UP SHEE~S 11~ 12 OF THE PLANS
ONE ~1> COPY OF L1ST DETAILING PROPOSED GRADES. CR£~SS-SLOP~S. AND
PROPOSED VERTICAL CURVES 1NFORMA]IO~
ONE (]) COPY OF SURVEY NOTES OF CONFLICT ~ LA]~RAL D-22
L. H. LACY COMPANY - DENTON TAP ROAD, PROJECT (379)
PROPOSED GRADE CHANGES @ N.B. LANES TIE-IN @ SANDY LAKE 70 AVOID
CITY OF DALLAS 50" WATER LINE IN PLAN SUI~GRADE
INTERFERRENCE WIT~
REFERENCE: LOOKING UPSTA'FION
REFERENCE: POSi]'IVE (+) X-SLOPE FROM MEDIAN '1'0 R.O.W.
STAl I ON NOTES ~ PROPOSED PROPOSED PROPOSED ~ PLAN PLAN PLAN
~ RIGHI MEDIAN X-SLOPE I RIGHT MEDIAN X-SLOPE
: TlC TlC : TlC TlC
166 + O0 MATCH : 495.27 495.19 (0.0024) : 495.27 495.19 (0.0024)
166 + 50
166 + 75 PVC-CURVE
167 + O0
167 + 08 SAG-CURVE
167 + 50 PVI-CURVE
168 + 00
168 + 25 PVCC-CURVEI/21
168 + 50
169 + 00 PVI'-CURVE
169 + 50
169 + 75 PVF.-CURVE
170 +. O0 N/C
170 + 50 N/C
171 + O0 N/C
495.02 494.75 (0.0085)
494.89 494.50 (0.0115) ; 494.05 494.51 0.0076
494.85 494.36 (0.0144) : 495.77 494.12 0.0105
494.88 494.55 (0.0156)
495.50 494.59 (0.0209) I 495.75 494.10 0.0109
495.43 494.72 (0.0209) ~ 494.39 494.54 0.0044
495.76 495.05 (0.0209) : 494.98 494.94 (0.0012)
496.10 495.39 (0.0209) : 495.58 495.54 (0.0071)
496.31 495.60 (0.0209) : 496.31 495.77 (0.0159)
496.45 495.72 (0.0209) ) 496.43 495.72 (0.0209)
496.26 495.55 (0.0209) : 496.26 495.55 (0.0209)
496.01 495.50 (0.0209) : 496.0] 495.30 (0.0209)
495.51 494.80 (0.0209) : 495.51 494.80 (0.0209)
495.01 494.50 (0.0209) : 495.01 494.50 (0.0209)
PROPOSED VERTICAL CURVE INFORMATION
CURVE I (EASF T/C) M = +.78
SLOPE 1= -.50%
SLOPE 2= +1.66%
CURVE 1 (MEDIAN T/C) M = +.78
SLOPE 1= -.92%
SLOPE 2= +1.66%
CURVE 2 (EAST T/C) M = -.70
SLOPE 1= +1.b6%
SLOPE 2= -1.00%
CURVE 2 (MEDIAN T/C) M = -.70
SLOPE 1= ~1.66%
SLOPE 2= -1.00%
i
* , t ,~1 f : I i