The Long Term Control Plan (LTCP) to mitigate CSOs is a revision to HSD’s original plan submitted to IDEM in 1997 and is being conducted pursuant to requirements under the federal Clean Water Act. The revised plan assumes that the Hammond Sanitary District is providing wastewater treatment services for the current customer communities of the City of Whiting, the Town of Griffith and the Town of Highland. The District’s continued service of these customer communities is subject to change in the future as a result of pending litigation and other disputes between HSD and those communities. As described in greater detail below, the recommended alternative also incorporates a 33 MG storage basin completed by September 2014, which HSD constructed pursuant to a 1999 agreement with EPA and IDEM. This basin is expected to eliminate 97% of all CSOs in those areas.
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