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Record of Decision for Cleanup of Groundwater

Fact Sheet for Proposed Plan for Cleanup of Groundwater
   - En Espaņol

Background Document - 2016

FAQs - 2016

Fact Sheet - Jan. 2016

The Administrative Record

NDEP Interim-Action Level

Sampling Equipment & Chemical Checklist

Home Mitigation
[SSD Systems]

Cleanup Technologies

Indoor Air Quality

Indoor Air Quality In the News
[External Links]

About Units of Measure

Maryland Square PCE Plume Map
(JPG - 4th Quarter, 2015)

History of Monitoring Well Installation

Posters from Community Meeting
(October 26, 2011)

Vapor Intrusion Figure (JPG)

Slides from Community Meeting to Present the Proposed Plan for Cleanup of Groundwater
(November 19, 2014)

Technical Resource Links

Maryland Square PCE Site

This webpage provides information about the discovery, subsequent investigation and cleanup of a hazardous substance called tetrachloroethylene [PCE] that was released from the former Al Phillips Cleaners in the Maryland Square Shopping Center at 3661 S. Maryland Parkway.

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The history of site discovery, investigation and cleanup is provided in the Background Document for the Maryland Square PCE site. Additional information is provided in the FAQs and the Fact Sheet, as well as in Sections 1 and 2 of the Record of Decision (ROD).

Progress on Cleanup, 2011 - 2016

Source Area Soil

Removal of PCE-contaminated soil at the former Maryland Square Shopping Center —Excavation of source area soil began on August 23, 2011. Soil samples were collected from the sidewalls and floor of the excavation to confirm the removal of PCE-contaminated soil. Based on these confirmation samples, additional excavation was required on the northern side of the excavation.

The floor of the excavation was treated with an oxidant prior to backfill. The oxidant (potassium permanganate, KMnO4) was applied to further degrade the PCE in groundwater and soil beneath the water table. The excavation was backfilled with clean soil that had been excavated onsite to attain a safe grade on the sidewalls of the pit, as well as clean soil imported from offsite. Backfilling and grading of the site were completed in late October, 2011. The Corrective Action Report for Source Area Soil (May 16, 2012) describes the cleanup of source area soils.


The Proposed Plan for Cleanup of Groundwater summarized the proposed remedy for remediating shallow groundwater and requested public input. There was a 90-day period for public review and comment, running from October 15, 2014 through January 13, 2015. A Community Meeting discussing the preferred remedy was held at the Winchester Cultural Center in Las Vegas on November 19, 2014. Comments from the community were addressed by the NDEP at this meeting and compiled for inclusion in the ROD.

The NDEP prepared the Record of Decision for Remediation of Groundwater at the Maryland Square Tetrachloroethylene Site (March 31, 2015). The ROD is the document that describes the remedy selected to clean up PCE-contaminated groundwater at the Site. All comments and responses to comments on the Proposed Plan are provided as an appendix in the ROD. The ROD was finalized on March 31, 2015.

The Remedy Design for Cleanup of Groundwater

Not all technologies are appropriate for all sites, due to geochemical, hydrological, geological or engineering issues. In the Las Vegas Valley, cleanup of PCE-contaminated groundwater is technically difficult due to the types of geologic deposits and the geochemistry of the shallow groundwater. Data from pilot testing and information from successful remediation of other PCE sites in the Las Vegas Valley were evaluated, and a multi-component remedy was selected.

The main component of the remedy focuses on hydraulic containment of the contaminant plume. This means that extraction (pumping) wells located upgradient of the Paradise Palms neighborhood will capture PCE-contaminated groundwater before it enters under the neighborhood. Extracted water will be treated and may be reinjected to facilitate cleanup. An additional component of the remedy could include targeted destruction of PCE in groundwater downgradient of the former dry cleaners, in a commercial area just east of S. Maryland Parkway.

Details of remedy design and function will be presented in the Remedial Design documents. The contractor selected by the responsible party to design and implement the remedy for cleanup of groundwater is Arcadis. Arcadis plans to conduct additional characterization, as described in the Pre-Design Characterization Work Plan (June 9, 2016). After this additional information is evaluated, Arcadis will prepare the Remedy Design documents, which will be reviewed by the NDEP. The remedy for cleanup of the PCE-contaminated groundwater will likely be in place and operating by the end of 2017.


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