Superfund Site Profile
The 57th & North Broadway Site is located near the northern portion of the city Wichita, Kansas (Figure 1-1). The site extends approximately 1/2 mile to the west of North Broadway Avenue between 61st Street on the north and 53rd Street on the south. South of 53rd Street to 47th Street, the site is extended approximately 3/4 mile west of Broadway to include an additional residential area. The eastern site boundary is defined by Chisholm Creek between 47th Street and 61st Street. The primary contaminants of concern (COCs) present in the groundwater at the site are PCE and the breakdown components of PCE and/or trichloroethene (TCE), 1,1-dichloroethene (1,1-DCE), cis-1,2-dichloroethene (cis-1,2-DCE), and vinyl chloride.
Two public water supply well fields are located within or adjacent to the 57th & North Broadway site. The City of Bel Aire well field is located just south of the site and serves approximately 5,800 people. The City of Park City's well field is located in the northern portion of the site and extends north of the site for one-half mile. This well field also serves approximately 5,800 people.
The site was placed in the National Priority List (NPL) on November 13, 1992. From August 1990 to May 1992, the USEPA performed a CERCLA removal action at the site which supplied residents and businesses with bottled water until the installation of an alternate water supply line could be completed. The alternative water supply was made available to selected business and residences on site by connecting them to the city water distribution system.
In 1997 and 1998, BVSPC conducted a remedial investigation of the site for the USEPA followed by a feasibility study in 1999. A Record of Decision (ROD) was signed for OU2, the Riverview area, identifying the preferred alternative as connecting residents to the public water supply and installation of in situ vapor extraction wells for remediation of the volatile organic compound (VOC) groundwater plume in the Riverview area. USEPA has connected the Riverview area residents to the public water supply and has implemented the remedial action of in situ vapor extraction wells. The Chisholm Creek Utility Authority installed a public water supply well immediately downgradient of the 57th & North Broadway site plume in 2003. USEPA has been collecting water samples from this well as part of its monitoring program since 2007. The sample results have shown some COCs present in this well, but they have all been below the maximum contaminant levels (MCLs).
A ROD was signed for OU1, the remaining site contamination both groundwater and soil, in September 1999. The OU1 ROD identified the preferred alternative for OU1 as installation of in situ vapor extraction wells for remediation of the groundwater and installation of a soil vapor extraction (SVE) system for remediation of the soil at the Wilco Paints property and the Midland Refinery property. The groundwater remedial action consisted of installation and operation of 25 in situ treatment wells (DDC systems) along 53rd Street and 6 systems in the Riverview area. The in situ treatment wells (DDC systems) were started up in August 2001.
DDC-53-1 through DDC-53-8 were shut off in August 2006 at the direction of USEPA because the COCs at these systems had been reduced to below the MCLs. Based on review of the DDC system data, it was determined that DDC systems were no longer providing efficient treatment of the groundwater, mainly due to the low level of contamination in the groundwater and DDC-53-9 through DDC-53-25 were shut off in March 2007 at the direction of USEPA. All the equipment and wells were left in place. The six DDC systems in the Riverview area continued to operate and were shut down in August 2008 at the direction of USEPA. All the equipment and wells were left in place. Groundwater monitoring continues at the site. The data is used to monitor the contamination levels in the plume and determine if clean up goals (MCLs or KDHE risk-based criteria) are being achieved for the site.
USEPA is in the process of removing the DDC systems and implementing a separate remedy for OU3 at the site.