caldwell county regional water and wastewater planning study

VSS, COD, Bacteria, Nutrients, and Lead concentrations that are transported tothe streams. The continuous additions of constituents further concentrate thecontaminant levels in the water. The concentration levels are also increased whenrunoff disturbs once settled sediment. The agitation of the water reloads the oncesettled constituents back into the system. The concentrations of sampled data atmonitoring stations during dry and wet conditions help correlate loadings withhigh, mid-range, and low flow levels.Monitoring stations in Lockhart, Luling and Uhland sampled constituents andplotted the results on a LDC. The LDC plots the condition of the stream flow withthe percent of days the flow exceeds the water quality standards. The LDC andmonitored data provide a means to calculate the load reduction required to meetwater quality standards. Tables 10-2, 10-3 and 10-4 list the load reductionscalculated to meet water quality standards. E.coli, Nitrate, Phosphorus, andOrthophosphorus were the constituents monitored.TABLE 10-2Estimated Loadings from Lockhart Monitoring StationLoadRequired % Reduction in FlowHigh- Moist Mid Range Dry - Low TargetE.coli 15 15Nitrate 18 66 80 80Orthophosphorus 49 49Total Phosphorus 5 5TABLE 10-3Estimated Loadings from Luling Monitoring StationLoadRequired % Reduction in FlowHigh- Moist Mid Range Dry - Low TargetE.coli 41 11 8 41Nitrate 1 1Phosphorus -Klotz Associates Project No. 0972.000.000January 201010-7Caldwell County Regional Water and Wastewater Planning StudyFinal Report