Item 4D - Memo Final CITY OF
SOi ITH i q KE Item 4D
MEMORANDUM
(January 17, 2017)
To: Shana Yelverton, City Manager
From: Rob Cohen, Director of Public Works
Subject: Approve the purchase of chlorine analyzers with Prime
Controls in an amount not to exceed $92,400
Action
Requested: Approve the purchase of chlorine analyzers with Prime Controls in
an amount not to exceed $92,400.
Background
Information: The City of Southlake purchases its potable drinking water from the
City of Fort Worth through a Wholesale Purchase Agreement. This
water is delivered to the City's two entry points at the pump
stations. It is then the responsibility of the City to ensure the water
quality is maintained throughout the City's distribution system as it
is delivered to Southlake's customers.
The City, also referred to as a Public Water System (PWS) by the
Texas Commission on Environmental Quality (TCEQ), is required
to comply with Texas requirements for monitoring, maintaining, and
reporting drinking water disinfectant levels to ensure public health.
Texas is required to adopt and enforce rules that are at least as
stringent as the rules set forth by the U.S. Environmental Protection
Agency (EPA). Since 1947, a PWS in Texas isrequired to maintain
minimum drinking water disinfectant levels in order to protect public
health throughout their distribution systems. In 2000, the TCEQ
adopted EPA provisions for maximum residual disinfectant levels
as well. Because of this upper threshold, a PWS that serves more
than 751 customers must collect and sample disinfectant levels at
least one time per day each day throughout the distribution system
to obtain a citywide sampling of the quality of the water.
Public Works Water Division personnel currently collect all of this
data on a daily basis by driving to each of the sampling sites. Total
chlorine residual disinfectant levels are measured daily at 12
locations including the Caylor and Alta Vista (Fort Worth's stations),
entry points into the City at the pump stations and their discharge
points, all elevated water storage tanks, and 2 of the 30 routine
bacteriological (Bac-T) sampling sites (these locations vary daily).
On average, Water Division personnel collect 300+ total chlorine
Page 1 of 3
Item 4D
samples per month by hand as part of the City's Water Quality
Program.
Purchasing eight (8) chlorine analyzers will supplement the
disinfectant residual data collected daily by the Water Division
personnel. This purchase includes the critical software integration
of the chlorine analyzers into the City's Supervisory Control and
Data Acquisition (SCADA) system. This system will provide
operators with real-time data regarding drinking water disinfectant
residual for the City's water supply. Through this integration, the
analyzers will capture total chlorine residual disinfectant levels in 5
minute intervals. This increases the City's total chlorine "leading
indicator" data for the storage facilities from 1 data point per day to
288 data points per storage facility per day (1 every 5 minutes).
This information will augment the mandatory collection still required
at other citywide locations.
Financial
Considerations: This purchase is exempt from bidding under the Texas Local
Government Code Chapter 252 Section 252.022 General
Exemptions: (a)(2) "a procurement necessary to preserve or protect
the public health or safety of the municipality's residents." In
addition, Prime Controls is the City's sole source vendor for SCADA
integration.
Funding for this item was approved by City Council in the FY 2017
Water Division Operating budget in an amount of$92,440.
Therefore, this purchase is within budget.
Strategic Link: This item relates to the City's strategy map relative to the focus
areas of Safety & Security and Performance Management &
Service Delivery. This item specifically relates to (C1) Achieve the
highest standards of safety & security and (136) Optimize the use of
technology.
Citizen Input/
Board Review: N/A
Legal Review: N/A
Alternatives: The City Council may amend, approve or deny this request.
Supporting
Documents: Attachment A: Quote
Staff
Page 2 of 3
Item 4D
Recommendation: Approve the purchase of chlorine analyzers with Prime Controls in
an amount not to exceed $92,400.
Staff Contact: Rob Cohen, Director of Public Works
Cristina McMurray, M.P.A, C.P.M, Deputy Director/Operations
Page 3 of 3