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Johnson County, Kansas Environmental Department Protecting You and Your Environment |
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1995 Local Limits Evaluation
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The 1995 Local Limits Evaluation completed the evaluation of Johnson County Unified
Wastewater Districts treatment facilities receiving wastewater from industrial users
permitted under JCED's Industrial Pretreatment Program. As an accompaniment to the
1994 Local Limits Evaluation and Turkey Creek MSD#1 Re-Evaluation, the 1995 Local
Limits Evaluation contributes to the depiction of wastewaters generated in the
County and the removal efficiency of the receiving wastewater treatment plants.
Wastewater treatment facilities included in the 1995 Local Limits Evaluation consisted of Mill Creek Regional MSD#1 and Tomahawk Creek MSD#1 (formerly Lower Indian Creek MSD#1) wastewater treatment plants. These facilities were omitted from the 1994 Local Limits Evaluation due to construction activities. The 1995 Evaluation was implemented upon completion of construction and stabilization of the treatment facilities. Three wastewater treatment facilities (Little Bull Creek SSD#1, Blue River SSD#4, Blue River MSD#1) were not included in either 1994 or 1995 Local Limits Evaluation. These facilities are solely residential or contain no regulatable industries. Mill Creek Regional MSD#1 is a new large capacity aerated lagoon facility which became operational in mid-1995. As a result, five JCUWD treatment plants (Cedar-Mill SSD#1, Tooley Creek MSD#1, Little Mill Creek North SSD#1, Little Mill Creek SSD#2, Mill Creek MSD#1) and the City of Lenexa's Little Mill Creek wastewater treatment plant ceased discharging to the surface waters of the State of Kansas and became contributors to Mill Creek Regional MSD#1. The Unified Wastewater Districts anticipate the future average flow to be approximately 9.0 MGD. Due to the size of the lagoons, the facility will have an estimate maximum flow of 65.0 MGD. Tomahawk Creek MSD#1, a trickling filter facility, completed a major upgrade during late 1994. This facility will have an estimated maximum flow of 10.0 MGD. However, the estimated average flow should not exceed 4.0 MGD. The 4.0 MGD rate will remain a constant due to an interlocal agreement with Kansas City, Missouri which allows for flows from the Lower Indian Creek Watershed to bypass Tomahawk Creek MSD#1 and flow to Kansas City's treatment facility. A total of nine inter-connection points now exist between Johnson County and Kansas City, Missouri. 1995 Local Limits Evaluation sampling was performed prior to the diversion of the Lower Indian Creek Watershed flows. The wastewater flow entering Tomahawk Creek MSD#1 is primarily from residential neighborhoods. Analytical data was assimilated during late 1995 through mid-1996 and subjected to screening parameters established by the KDHE and EPA, where applicable. Upon completion of the screening evaluations, effluent discharges were found to be within the limits of the screening parameters at Mill Creek Regional MSD#1. However, effluent discharges at Tomahawk Creek MSD#1 exceeded the EPA evaluation limits for copper, zinc, and silver. Potable water analysis by Johnson County Water District No. 1 and JCED indicate that copper and lead are present in significant quantities in the background water. This suggests that potable water systems and fixtures contribute to the exceedances for copper and possibly zinc. Silver discharge control measures, focusing on formal notification of silver generators of discharge requirements, were conducted during late 1995. No additional silver discharge regulatory action will be pursued at this time pending the outcome of the notification actions. Sludge removal from Mill Creek Regional MSD#1 does not occur, nor is anticipated for several years. Sludge generated at Tomahawk Creek MSD#1 is not processed at the facility. Instead, sludge is transported to the collection system of Turkey Creek MSD#1 where it becomes a constituent of Turkey Creek's influent. Sludge was therefore not subjected to further evaluation. |
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