57th and North Broadway Streets Superfund Site, Wichita Heights, Sedgwick County, Kansas
The U.S. Environmental Protection Agency is performing an additional investigation in preparation of a new remedy for the 57th and North Broadway Streets Superfund Site. Site contaminants include trichloroethene (TCE), tetracholoroethene (PCE), and vinyl chloride.
The 57th and North Broadway Site is located in the northern region of the City of Wichita, Sedgwick County, Kansas. It is located on the diagonal that runs from the extension of West 58th Street North and Broadway Avenue to the southwest and extends to approximately West 46th Street North and Armstrong Drive. The 57th and North Broadway Streets Site is primarily a ground water contamination site. The sources of contamination in this area have been determined to be several commercial operations at the upper end of the contaminant plume.
PROGRESS AND CURRENT CONDITIONS
During the monitoring period from 2002 until 2007, it appeared that the source of the original plume had either been treated or had passed through the site. However, a new PCE plume was discovered during investigations conducted in 2007 and 2008. Based on those investigations, EPA determined that the new PCE plume originated from an area north of the Midland property and Allen’s Auto Salvage. Additional evaluations were conducted to determine the effectiveness of the density-driven circulation (DDC) wells and the remedy as a whole. The final results and recommendations suggested that these wells were or have become ineffective. By 2008, all DDC wells were shut down for various reasons.
The soil vapor extraction (SVE) system at Midland still appears to be functioning as designed; but recently, the system was shut down temporarily to check for its effectiveness and rebounds. Data collected at this site so far indicates that the contamination is not leaking into the ground water from this source.
EPA continued its investigations to determine the location of the source and the type of remedy best suited for this plume. In 2010 and 2011, EPA conducted both ground water and soil testing at Allen’s Auto Salvage, the Midland area, along 53rd and south to the Riverview area. Additionally, more testing was conducted for residents that use their own private wells for water consumption. Riverview residents will be offered an alternate drinking water supply if sampling results identify contamination in their well water.
EPA is currently evaluating other technologies such as ground water extraction and treatment in an area south of 53rd street to address the plume before it migrates further south. Additionally, technologies to address contaminated soil and ground water at Allen’s property are being considered. These alternatives will be presented in an upcoming Record of Decision for public comment.
Investigations between 1984 and 1994 identified volatile organic chemicals above the maximum contaminant level in the ground water as well as contaminants in the soil and surface water. The primary constituents of concern include TCE, PCE, and vinyl chloride. The site was listed on the National Priorities List on November 14, 1993.
From August 1990 to May 1992, EPA performed a removal action at the site which supplied residents and businesses with bottled water until the installation of an alternative water supply line was completed in the spring of 1992. The site was divided into two Operable Units (OUs): OU1 identified remedies site-wide and OU2 was for remedies in the Riverview area. OU2 was mainly to connect residents to the public water supply. The Record of Decision for OU1 was completed in September 1999 and included remedies for soil and ground water. The soil remedy used SVE and the ground water remedy used ground water circulation wells, which use DDC technology to provide treatment via in-well air stripping. Thirty-one well strippers were placed in the Riverview area and along 53rd Street. The remedies were completed in September 2002.
The site Administrative Record is available at the following locations during normal business hours:
EPA Records Center
901 North Fifth Street
Kansas City, Kansas
Park City Library
2107 E. 61st Street
Park City, Kansas
EPA is committed to keeping the community informed about site activities throughout the cleanup process. If you have any questions regarding ongoing and planned response actions, please contact:Ben Washburn
Community Involvement Coordinator
EPA Region 7
901 N. Fifth St.
Kansas City, KS 66101
Toll-free: (800) 223-0425