Blackberry Farm-CS180717 2740 North Dallas Parkway,#280
Plano,TX 75093
Westwood Main (214)473-4640
Fax (320)253-8737
westwoodps.com
(888)937-5150
July 17, 2018
Mr. George Marshall, P.E.
Engineering Manager
255 Parkway Blvd.
Coppell, Texas 75019
Re: Blackberry Farms Addition Phase 1, Sandy Lake Road, Coppell, Texas
Dear George,
Attached are two sets of plans. There was no hard copy of comments. See attached for responses to ,our
comments that were on the PDF copy of the plans you sent.
Please process these and contact me if you have any questions.
Sincerely,
L. Lynn Kadleck, PE, RPLS
Senior Project Manager
Kadleck&Associates, a Division of
WESTWOOD PROFESSIONAL SERVICES
Copy: David Hayes
Terry Holmes
Multi-Disciplined Surveying Si Engineering
'LS Firm No. 10074301 westwoodps.com
RESPONSE TO CITY COMMENTS FROM APRIL 21, 2018
COVER
1. Engineering wants Screening Wall Plans. To be provided prior to release of plans.
2. The plans comply with the CDC comments—see attached approval letter from the Corp. Flap gates
were added to the discharge pipes from the storage ponds.
3. A PD Amendment is being requested which includes changing the arch culvert to a single arch.
4. The creek slope protection plans were removed from the civil set since the Corp does not want the
creek banks disturbed. It is understood the city still wants to discuss this issue.
5. It is my understanding that a resubmittal of a CLOMR to FEMA is not necessary. The LOMR will be
submitted to FEMA after the site grading has been completed and verified.
6. Gabion Wall Plans were added to sheet index.
FINAL PLAT
1. The easement width is determined by the placement of the storm sewer culvert and the sanitary
sewer. There is a separation of pipes requirement- 9'min. We have 10.5+/-`.
2. Show lot line for Lot 8x in Detail A. Line added.
3. Correct arrow location in Detail B. Correction made.
4. Show the revised floodplain line based on the Blackberry Farm flood Study????
7. Provide an X lot along the north side of Lots 14 and 15, Block A.An X lot was placed at the rea of
Lots 14 and 15, Block A, which is an extension of Lot 8X created along the northerly west side o the
addition.
5. Persimmon"Court"versus"Drive" Changed to Drive.
6. The TPL easement was a blanket easement that will be abandoned once the defined easement h
been granting by plat.
GRADING PLAN
1. You show FB and BFE from Elevation Certificates for the Lakeside Estate Lots. Information Added.
2. Provide X Lot along north side of Lots 14 and 15. Lot 8X extended.
3. Why riprap removed from storm outfalls into creek? Rip-Rap added.
4. Drain area of future Windmill Drive before crossing gets built? Graded so will drain to creek.
5. Show gabion width in plan view and call out which sheet to find design. There is not sufficient rig om
to show any detail on the grading plan. A reference to the Gabion Plans is made by a notation.
6. How will area north of Phase 2 drain? The lot layout and sizes for the Phase 2 area has been rev'sed.
Basically, the area drains in four directions. That pattern will be honored with the temporary
grading of Phase 2. For the final grading of Phase 2 when developed, there will be storm sewer
collecting the water from the future street and discharging into the creek on the west and to the
storage pond on the east.
7. Pumping system is not acceptable for drainage valley storage. Pond and valley storage revised d e
to new layout for Phase 2, which eliminates the need for pumping.
8. Valley storage is below the outfall of the storage basin and the CD discusses the use of flap gate-
and pump. The valley storage and the pond elevation were revised due to Phase 2 changes so the
outfall is at the needed elevation and flap gates were added to prevent flow from Denton Creek from
entering the ponds. The north pond is being excavated to a depth below the outfall so that it will
retain water for an amenity.
9. 100 year elevation based on the storm sewer profiles. Elevations added.
10. No lot to lot drainage in the area of Lots 1-3, Block C and the adjacent property to the south. We had
discussed this previously and it was determined that we would have to get a drainage easement from
the adjacent owner (which has been done and a copy is attached) to allow for runoff from Lots 1-3
onto the easement area and drain out to the creek There is no lot to lot drainage from Lot 1 to Lot 2
or Lot 2 to Lot 3. What we show on the plans is in line with this previous discussion.
11. Positive drainage through the bottom of the south storage pond—grades revised and a concrete pilot
was provided.
PAVING PLAN
1. Sheet 8 —show actual street intersection in profile. Information added.
2. Sheet 9 and 10—The sheets have been revised to have Plan and Profile on one sheet with a match
line.
3. Sheet 9—Mountable curb- it was decided to not have a curb in the center of the cul-de-sac due to
fire truck maneuvering.
DRAINAGE AREA MAP
1. X lot on north end of Lots 14 and 15 —Lot 8X extended.
2. The contours in the creek area not shown—layer turned on.
STORM SEWER
1. Sheet 18 —Add note that city will not be responsible in any form for the retaining wall above the
storm drain, etc. —Note added
2. Sheet 20—Need easement for storm sewer— Will be created by separate instrument.
3. Sheet 21 —Comment regarding pumping of valley storage—see above response for Paving no. 8
4. Waterman flap gate—an aluminum flap gate will be specified instead of cast iron.
3. Sheet 22—Lot 8X extended across back of Lots 14 and 15.
5. Private Drainage Easement- callout deleted.
WATER PLAN
1. Sheet 24 - Graphic issue—resolved.
2. Sheet 25 —Add volume and page for existing easement to detail -Added
3. Sheet 26—Why reducer?Length of 12 inch pipe corrected, reducers to go from 12 inch to 8 inch.
4. Sheet 27—Water and sanitary sewer services locations at lot corners. Services and laterals revised to
comply with request.
5. Sheet 29—Match line C callout and show in manhole. Completed
6. Sheet 30—Call out outside drop at manhole. Completed
7. Sheet 31 —Put on 20 scale and show contours at creek. Completed
8. Sheet 32 —Provide engineering backup for support of aerial crossing; why steel pipe and provide
thickness, was it included in the design? See Freeport Parkway plans for example.Additional
information has been added and a separate seal and signature will be placed on the plan for the
structural design.
DEPARTMENT OF THE ARMY
FORT WORTH DISTRICT,CORPS OF ENGINEERS
(q; P.O.BOX 17300
/7 FORT WORTH,TEXAS 76102-0300
April 9, 2018
Mr. Kent M. Collins, P.E., CFM
Assistant Director of Engineering
City of Coppell
P.O. Box 9478
Coppell, Texas 75019
Dear Mr. Collins:
In response to your letter of October 17, 2017, the U.S. Army Corps of Engineers
Fort Worth District has completed the Technical Review of CDC application COP
092717-01 The Holmes Builders Blackberry Farm Addition.
The results of the Technical Review indicate that the project meets the CDC
Common Regional Criteria as stated in the CDC Manual 4th Edition.
Please contact Michael Danella, at 817-886-1690, if you have questions about the
Technical Review or require additional information.
Sincerely,
Cl - ( itika ALV--)
BRIAN T. GIACOMOZZI, P,E., PMP, CEM
Chief, Engineering & Construction Division
cc:
Ms. Mio Matsumura
O'Brien Engineering, Inc.
2340 E. Trinity Mills Road, Suite 220
Carrollton, Texas 75006
Ms. Mia Brown, CFM
Environment and Development Planner
North Central Texas Council of Governments
P.O. Box 5888
Arlington, Texas 76005