R-00-11-21-10C6 - 11/21/2000RESOLUTION NO. R- 00- 11- 21 -1006
WHEREAS, the City of Round Rock desires to retain engineering
services for bench scale testing for manganese at the main well site,
and
WHEREAS, HDR Engineering, Inc. has submitted a letter of
agreement to provide said services, and
WHEREAS, the City Council desires to enter into said letter of
agreement with HDR Engineering, Inc., Now Therefore
BE IT RESOLVED BY THE COUNCIL OF THE CITY OF ROUND ROCK, TEXAS,
That the Mayor is hereby authorized and directed to execute on
behalf of the City a letter of agreement with HDR Engineering, Inc.,
for bench scale testing for manganese at the main well site, a copy of
said letter of agreement being attached hereto and incorporated herein
for all purposes.
The City Council hereby finds and declares that written notice of
the date, hour, place and subject of the meeting at which this
Resolution was adopted was posted and that such meeting was open to the
public as required by law at all times during which this Resolution and
the subject matter hereof were discussed, considered and formally acted
upon, all as required by the Open Meetings Act, Chapter 551, Texas
Government Code, as amended, and the Act.
RESOLVED this 21th day of Nov- 1•er, :000
E LAND, City Secretary
K.\ NPOOCS \RSSOLOTI \RO11]1C6.NPO /e[
AAVA AO
R•" RT A. STLUKA, ., Mayor
AT EST: City of Round Rock, Texas
November 7, 2000
Mr. Jim Nuse, PE
Director of Public Works
City of Round Rock
2008 Enterprise
Round Rock, TX 78664
Re: Bench Scale Testing for Manganese at the Main Well Site
Dear Mr. Nuse:
ha 1
We are pleased to present this letter to you as a proposal for a bench scale evaluation of
the problems the City is experiencing with manganese at the Main Well Site. The
objective of the study is to evaluate the extent of the manganese occurrence in the City's
wells and to develop some short-term solutions that can be quickly implemented to
reduce the incidents of "brown water" the City is now experiencing.
The study will focus on the addition of sequestering agents to the well water that will
tend to keep the manganese in solution and reduce the water quality problems in the
distribution system. We will not examine the removal of manganese. Due to the high
level of manganese recently measured in the wells, we expect that the use of a
sequestering agent may significantly reduce the water quality problems in the distribution
system, but we do not expect this treatment scheme to totally solve the City's problem. If
one of the agents tested proves to work well, this approach can serve as an effective
short-term solution to reduce the water quality complaints until a long -term solution can
be developed.
The work items to be completed are as follows:
• Review groundwater testing performed to date by the City and others.
• Meet with City personnel to characterize the occurrence of the water quality
problems.
• Obtain samples from Well No. 7 as well as all other wells supplying the Lake Creek
Pumping Station.
• Test each well sample for manganese, iron, pH, alkalinity, hardness, and total
dissolved solids.
• Perform jar testing with at least four different sequestering agents. These tests will
evaluate the effectiveness of each sequestering agent in controlling manganese
precipitation. Each agent will be tested at differing dosages in a series of jar tests.
Chlorine will be added to each sample to oxidize the manganese present. The
resulting manganese precipitation will be measured immediately after chlorination
and after approximately 24 hours of reaction time.
HDR Engineering, Inc.
Employee - owned
2211 South IH 35 Telephone
Suite 300 512 912 -5100
Forum Park - Fax
Austin, Texas 512 442 -5069
78741
Mr. Jim Nuse, PE
November 7, 2000
Page 2
• Prepare a summary report presenting the results of the testing. The report will also
include recommendations for equipment and the process configuration for the
addition of sequestering agent at the Main Well Site.
Payment will be made to HDR Engineering, Inc. on a reimbursable basis not to exceed
$14,500. Labor cost will be billed at 3.335 times cost, and expenses will be billed at
invoice cost plus 10 %. We will not exceed the maximum fee without written
authorization from the City.
This letter has been submitted in duplicate. If acceptable, please execute both copies on
the following signature block and return one copy to me. The remaining copy is for your
records. We are excited about the opportunity to work with you, and look forward to
being of assistance. Please call if you have any questions.
Sincerely,
HDR Engineering, Inc.
Neil A. Graff, PE
Project Manager
SUBMITTED BY:
HDR ENGINEERING, INC.
2211 South 1H 35, Suite 300
Austin, Texas 78741
s K. (Ken) Haney, P
Executive Vice President
ACCEPTED BY:
CITY OF ROUND ROCK
221 E. Main Street
Round Rock, TX 78664
,bt3F 27 ,q. 5rLL1 a J e .
innyoR.,
Date: / / —D0
DATE: November 15, 2000
SUBJECT: City Council Meeting — November 21, 2000
ITEM: 10.C.6. Consider a resolution authorizing the Mayor to execute a letter of
agreement with HDR Engineering, Inc. for bench scale testing
for manganese at the main well site. HDR will evaluate the extent
of the manganese occurrence in the City's wells and develop some
short-term solutions that can be quickly implemented to reduce the
incidents of "brown water".
Resource: Jim Nuse, Public Works Director
History: The City has been experiencing problems with discolored water this past
summer. It is determined that it is due to manganese in water at City's wells.
Funding:
Cost: $ 14,500.00
Source of funds: Repairs and Maintenance — Wells Boosters
Outside Resources: HDR Engineering, Inc.
Impact: N/A
Benefit: To clear up brown color water from the water system.
Public Comment: N/A
Sponsor: N/A