East Central Phoenix - 32nd Street and Indian School | Site History

2021: The ERD groundwater treatment pilot study continued throughout the year. Soil vapor extraction was performed intermittently at the former Maroney’s property. The SVE system located at the former Viking's location was moved offsite.

2020: An enhanced reductive dechlorination (ERD) groundwater treatment pilot study was initiated in February 2020. The PRAP was released in September 2020. Soil vapor extraction was performed intermittently at the former Maroney’s property.

2019: Rebound evaluations continued at both the Maroney’s Cleaners and Viking Cleaners Soil Vapor Extraction (SVE) systems. The Draft Remedial Investigation (RI) Report was released in March.  The Proposed Remedial Objectives (RO) Report was released in May.  The Final RI Report and Feasibility Study (FS) Workplan were released in June. The Final FS Report was completed in September.

2018: Two additional wells, VCMW-24 and 26, were installed to delineate the downgradient extent of the plume. The SVE system at Maroney’s was shut down for a rebound evaluation. Concentrations remained below the health-protective concentrations during the rebound evaluation period and the system was not restarted. In December, an additional soil vapor extraction well (SVE-10) was installed at the former Viking Cleaners facility.

2017: Groundwater well drilling continued in an effort to fully delineate the plume, including drilling of VCMW-08AR and VCMW-23. Additional SVE wells and vapor probes were installed to assist ongoing SVE operations at both the Maroney’s and former Viking Cleaners facilities.

2016: Several groundwater wells and borings were installed to further delineate the plume including VCMW-03B, 06B, 15-17, 20, and 22. A rebound evaluation and remediation optimization review was conducted for the Maroney’s SVE system. The Viking SVE system operated for much of the year with only brief shutdown periods for maintenance and operational considerations. In December, the Arizona Department of Health Services (ADHS) published a Health Consultation and concluded that there is no inherent public health concern from subsurface PCE or trichoroethene (TCE) vapor concentrations.

2015: A total of four groundwater and five soil vapor monitor wells were installed throughout the site. Design and implementation of SVE remediation systems was initiated as part of an early response action (ERA) near the Maroney’s Cleaners and the former Viking Cleaners. The Maroney SVE system has been turned off due to low soil vapor concentrations. The Viking SVE system is operating. Site investigation and groundwater well installation continued throughout FY16.

In FY 2015, a total of 117 pounds of Volatile Organic Compounds (VOCs) were removed at the Maroney and Viking SVE system sites. Additionally, 183 groundwater, 19 soil vapor, and 38 soil samples were collected.

2014: Construction of the SVE systems located near the former Viking’s Cleaners facility was completed in the summer of 2014. A total of 13.075 pounds of volatile organic compounds (VOCs) were removed from the Maroney’s SVE system. Additionally, 68 groundwater and 326 soil vapor samples were collected.  Follow-up indoor air samples were also collected to further assess the potential for vapor intrusion.

2013: The SVE system near Maroney’s Cleaners became operational in June.  Additionally, ADEQ installed soil vapor wells to help delineate the soil vapor plume along the eastern portion of North 32nd Street between East Indian School Road and East Glenrosa Avenue, and at the corner of East Indian School Road and North 31st Street. Soil vapor wells were also installed along the southern portion of the Viking facility.

Soil vapor samples showed concentrations of PCE varied significantly from location to location. PCE was detected in soil vapor at concentrations as high as 4,100 micrograms per cubic meter (µg/m³). The results of soil vapor sampling delineated an area in which PCE concentrations exceeded vapor intrusion screening levels calculated from available EPA guidance. Based on this information, ADEQ went door-to-door to collect indoor air samples from residences located above the soil vapor plume to assess the potential for vapor intrusion. Sample results did not indicate a wide-spread vapor intrusion problem.

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