NL Cypress-CS120110Memorandum
To: Bill Walker, Billingsley Company
From: Roy Wilshire, Kimley -Horn and Associates, Inc.
Date: January 10, 2012
Subject: Spillway Modification and Lake Edge Coordination
A conference call for coordination was held on January 10, 2012, between representatives
of Kimley -Horn and Freese and Nichols to begin coordination between the firms
involved in the modification of the spillway and lake edges for North Lake within the
Cypress Waters development. Those in attendance included:
Bill Walker, Billingsley Company
John Rutledge — Freese and Nichols
Brad Moss — Kimley -Horn
Steve Galloway — Kimley -Horn
Larry Clendenen — Kimley -Horn
Roy Wilshire — Kimley -Horn
Documents used in the discussion were:
1. The attached map showing the lake edge under various conditions — (1) as
described by metes and bounds in ownership documents, (2) as expected when the
water surface is lowered to elevation 490, and (3) a reconfigured lake boundary
generally per the Cypress Waters master plan.
2. A preliminary schedule (attached) for actions needed to achieve a lowered lake.
The following points were discussed and actions noted:
1. Freese and Nichols' contact with the Corps of Engineers (COE) to this point has
been limited to early informal discussions.
2. Freese and Nichols has been delayed in performing environmental studies and
geotechnical investigations awaiting Luminant's permission to enter the property.
It was reported that the City has now been given that permission and John
expects to get his environmental staff on -site to make those determinations —
possibly within the month or early February. Following completion of those
studies, John will set a meeting with COE to attempt to get agreement that (1)
there is a new (lower) existing high water elevation due to the current fill pipe's
being used to control the water surface elevation, and (2) that there is minimal
environmental impact caused by the revised spillway construction.
3. Based on an assumed positive reaction and agreement by the COE, John expects
the design and approval process to be within the durations shown on the
preliminary schedule.
4. The above is also based on treating the spillway modification as a separate project
from the adjustment of the lake edge.
5. TCEQ approval of the spillway modifications is not expected to have a schedule
impact since the proposed project significantly reduces downstream risks.
6. The Freese and Nichols consulting agreement with the City of Coppell currently
authorizes the preparation of the North Lake Dam Spillway Modification report
(completed) and environmental studies. Authorizations for preparing and
processing other required permits (FEMA, City of Dallas, etc.), final design, and
construction will be required in a timely manner to achieve the preliminary
schedule.
7. Billingsley's goal is to have construction completed on the spillway and portions
of the lake edge so as to allow construction of Phase II of Cypress Waters to begin
in November 2013, on a location within the current inundated lake area.
Coordination among the parties will be required to accomplish the approval of
required permits from multiple agencies.
8. Assuming that COE agrees that the spillway modification and lake edge work are
two separate projects, Kimley -Horn will begin working with Billingsley to define
the desired lake boundary and lake edge treatment, and prepare a plan for
excavation and grading to accomplish that plan. This plan will determine the
amount of material needed to accomplish that grading. Construction PS &E for
this work will be provided by Billingsley.
9. In coordination with Freese and Nichols as noted in Item 6, the above plan will be
used as the basis for preparation of a Conditional Letter of Map Revision
(CLOMR) for submission to FEMA and a floodplain fill permit submittal with the
City of Dallas, as well as coordination with TCEQ and COE for permits as
required to excavate and fill in order to create the desired lake edge.
10. Assuming that off -site material will be needed for fill, Billingsley and Kimley-
Horn will begin discussions with the LBJ Freeway contractor to explore the
options for placing or temporarily stockpiling acceptable excess material from
that project. Both the City of Coppell and CISD may find it beneficial and want
to participate in this action.