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CONTRACT K-1516-79: A CONTRACT BY AND BETWEEN THE CITY OF NORMAN, OKLAHOMA, AND THE OKLAHOMA WATER RESOURCES BOARD IN AN AMOUNT NOT-TO-EXCEED $229,756.23 FOR THE IMPLEMENTATION OF THE LAKE THUNDERBIRD TOTAL MAXIMUM DAILY LOAD (TMDL) PLAN.
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BACKGROUND: The Oklahoma Department of Environmental Quality (ODEQ) issued the Total Maximum Daily Load Report (TMDL) for Lake Thunderbird and its watershed on November 13, 2013. The goal of the establishment of this TMDL is for the water in Lake Thunderbird to meet state and federal Water Quality Standards (WQS). The report identifies two beneficial uses that the Lake does not meet (referred to as nonattainment): Warm Water Aquatic Community and Public and Private Water Supply. This nonattainment is due to impairment in three categories of measurement: turbidity, dissolved oxygen and Chlorophyll-A. Certain pollutants in the water have a detrimental effect on these parameters for the Lake. The Lake is required to reduce the amounts of these pollutants discharged within the Municipal Separate Storm Sewer System (MS4) operated by the City of Norman. The parameters for monitoring are Total Nitrogen (TN), Total Phosphorus (TP), Total Suspended Solids (TSS) and Carbonaceous Biochemical Oxygen Demand (CBOD20). Modelling of the Lake and its Watershed was done by ODEQ to determine the Waste Load Allocations (WLAs) for the three cities in the watershed, Norman, Moore and Oklahoma City.
The City of Norman has a vested interest in a successful program as Lake Thunderbird serves as Norman's primary drinking water source. The cities of Moore and Oklahoma City must also comply with the TMDL; however, neither of those cities gets their drinking water from Lake Thunderbird.
DISCUSSION: A plan for compliance with the Lake Thunderbird TMDL was submitted by the City of Norman to ODEQ before the due date of November 13, 2015. This Plan included a monitoring component with the purpose of identifying those sub-wate...
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