Denton Creek/Sandy Lake-CS090716
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I Gonzalez & Schneeberg I
July 16, 2009
Ms. DiWanna E. Baskins
Graduate Engineer
City of Coppell
Coppell, Texas 750
Dear Ms. Baskins,
We have received your comments letter and markups of the submittal for the referenced project.
Attached you will find three sets of revised plans which have been revised to address these
comments. Additionally, below we have listed each of the comments found in your letter dated
June 18, 2009 followed by our response in italics.
The City of Coppell has reviewed the referenced plans and has the following comments to offer:
Pavinq Plan
1. Refer to the City of Coppell details for the median nosing and concrete strength. We
have added several references to the City's Standard Details and have included a few
of these details as Sheet C10. See Sheets C1 and C10.
2. Provide grades for the driveway tying into Sandy Lake Rd. Grades are included on the
Grading Plan - Sheet C5.
3. The plates used to cover the open-cut locations must be secured with bolts. Note has
been added on Sheet C10 regarding the use of bolts.
Drainaqe Area Map
I. Include adjacent offsite drainage area in runoff calculations and overall drainage area.
Drainage Area Map is taken from the Plans for Sandy Lake Road and includes all
adjacent runoff areas.
2. Show that the downstream system has capacity for increased runoff and future
development. The system in Sandy Lake Road was sized to accommodate runoff from
Residential development. We are honoring the drainage divides and residential runoff
rates with this project.
Erosion Control Plan
1. Protect all inlets that may be affected by onsite movement and within a reasonable
distance to site; including the existing storm inlet adjacent to Sandy Lake, outside the
property line. Inlet protection for the inlets in Sandy Lake Road have been added.
Gradinq and Drainaqe Plan
1. Provide grading and drainage plan(s). Grading Plan is included as Sheet C5.
2. Provide the proposed runoff calculations. Existing and proposed runoff conditions are
the same as the system in Sandy Lake was designed to accommodate runoff from
residential development.
3. The finish floor elevation appears to be lower than the elevations provided for the 2-
story home. Provide a grading and drainage plan(s). Grading Plan is included as
Sheet C5.
4. It appears that the paved area to the west of the future dumpster site will have standing
water. Correct and/or verify the slope of the pavement. No pavement on the
commercial site in anticipated with this plan set. Proper drainage for the dumpster pad
will be completed with that phase of the project.
Water and Waste Water Plan
1. Is the 4-inch sanitary line designed to service both buildings? If so, the 30 ft. line at the
tie-in location should have an 8-inch diameter and add a manhole. If not, the proposed
sewer service to the office building should tie-in at the existing manhole. A sewer
service for the residence only has been provided.
2. Show the proposed sewer line services to the home and omit the "future" notated.
Requested line has been shown.
3. Explain the need for relocation of the meters and vaults. Consider placing the water
line in the City's R.O.W and alleviate the easement. Water line and meters are located
just north of the property line to avoid a conflict with the existing storm drainage system
for Sandy Lake Road.
Miscellaneous
1. Refer to comments in the first plan review letter. Comments have been checked and
appropriate corrections and changes completed.
We trust that the attached plans address all of your concerns. Please call me if you have any
questions or need any additional information.
Sincerely,
~W.
Robert W. Schneeberg, PE, RPLS