Water Quality Assurance Revolving Fund (WQARF) Site

East Central Phoenix (ECP) 38th Street and Indian School Road

Community Involvement Activities Public Health Impact Site Hydrogeology
Contacts Public Meeting Calendar Site Map
Contaminants Public Notice Calendar Site Status Update
Online Information Repository Site History

The ECP 38th Street and Indian School Road WQARF (site) plume, in Phoenix, Arizona, is approximately bounded by Indian School Road to the north, 38th Street to the east, Picadilly Road to the south and 36th Street to the west.

The plume boundaries depicted on the site map represent the Arizona Department of Environmental Quality’s (ADEQ) interpretation of the data available at the time the map was constructed. The map is intended to provide the public with basic information as to the estimated extent of known contamination as of the date of map production. The actual extent of contamination may be different. Therefore, the plume may change in the future, as new information becomes available.


Site Status Update:

In fiscal year 2015, a total of 69 groundwater and 3 soil vapor samples were retrieved. A Remedial Investigation report and a Feasibility Study Work Plan were finalized.


Community Involvement Activities:

A community advisory board (CAB) was formed in November 2007. Details of CAB meeting agendas and minutes can be viewed at the ADEQ website. These meetings are open to the public.


Site History:

1989: This site is part of the ECP study area, which is bounded by Camelback Road to the north, McDowell Road to the south, 50th Street to the east and 20th Street to the west. Soil vapor surveys were conducted at multiple facilities throughout the ECP study area to determine if a release of contaminants to the subsurface had occurred. ADEQ collected samples to 30 feet bgs at the former locations of The Cleaners and Rose Formal Wear facilities located along the south side of Indian School Road, between 36th and 38th Streets. One soil vapor sample was collected adjacent to each facility. The maximum concentrations of PCE detected in the soil vapor samples were 16,000 μg/L and 400 μg/L, respectively.

1992: Eleven borings were drilled adjacent to the former The Cleaners facility. The soil concentrations of PCE ranged from less than the laboratory reporting limit to 0.17 milligrams per kilogram (mg/kg). ADEQ also installed three groundwater monitoring wells: one south, one east and one approximately 500 feet southwest of the former The Cleaners facility. The initial groundwater sample collected from the well directly south of the former The Cleaners facility had a PCE concentration of 34,000 μg/L.

An additional eight soil borings were drilled adjacent to the former Rose Formal Wear facility. The soil concentrations of PCE were all less than the laboratory reporting limits of 0.020 mg/kg. ADEQ also installed a groundwater monitoring well adjacent to the former Rose Formal Wear facility. The initial groundwater sample collected from the well had a PCE concentration of 350 μg/L.

1994: ADEQ installed a dual-nested groundwater monitoring well near the intersection of Amelia Avenue and 36th Street. The initial groundwater samples collected from the well had shallow and deep PCE concentrations of 5.8 μg/L and less than the Aquifer Water Quality Standard (AWQS) of 5 μg/L, respectively. During a routine groundwater monitoring event, the maximum PCE concentration observed throughout the site was 1,600 μg/L.

1995: ADEQ installed a soil vapor extraction (SVE) system located adjacent to the former The Cleaners facility. The SVE system became operational in July and ran periodically through the beginning of August. The SVE system was shutdown to perform a soil vapor rebound test. By the end of August, the treatment system appeared to have reached the appropriate cleanup criteria; the system was shutdown and removed from the site in 2003. In total, the system removed 7.7 pounds of volatile organic compounds (VOCs).

1996: ADEQ collected confirmation soil and soil vapor samples from three borings to a depth of 30 feet below ground surface (bgs) located near the former The Cleaners facility. The soil concentrations of PCE ranged from less than the laboratory limit to 0.17 mg/kg. The soil vapor concentrations of PCE ranged from less than the laboratory limit to 140 μg/L. Based on the results, ADEQ concluded that the SVE system had reduced soil vapors in the vadose zone. During a routine groundwater monitoring event, the maximum PCE concentration observed throughout the site was 2,700 μg/L.

1997: ADEQ collected several groundwater samples from two borings located within the vicinity of The Cleaners and Rose Formal Wear facilities. PCE in groundwater was detected in one boring, with concentrations ranging from less than the laboratory limit to 12.9 μg/L. During a routine groundwater monitoring event, the maximum PCE concentration observed throughout the site was 1,700 μg/L.

1998: The site was placed on the WQARF Registry with a score of 20 out of a possible 120. During a routine groundwater monitoring event, the maximum PCE concentration observed throughout the site was 2,500 μg/L.

2002: During a routine groundwater monitoring event, the maximum PCE concentration observed throughout the site was 180 μg/L. No other work was performed by ADEQ.

2003: ADEQ removed the SVE system located adjacent to the former The Cleaners facility. During a routine groundwater monitoring event, the maximum PCE concentration observed throughout the site was 12 μg/L.

2004 - 2006: Routine groundwater monitoring was conducted at the site. The maximum PCE concentrations observed throughout the site ranged from 8.0 μg/l to 38 μg/l.

2007: In June, ADEQ sent out notices per A.R.S. §49-287.03, initiating the remedial investigation (RI) for the site. During a routine groundwater monitoring event, the maximum PCE concentration observed throughout the site was 37 μg/L.

2008: ADEQ installed an additional groundwater monitor well located west of the former Rose Formal Wear facility. The initial groundwater samples from the new well were collected from multiple depths; PCE was not detected in the well above the AWQS of 5 μg/L. The results from this sampling event indicate that the vertical extent of the plume has been assessed in this area.

ADEQ conducted groundwater sampling, using passive diffusion bag samplers in the monitor wells. The maximum PCE concentration observed throughout the site was 98 μg/L.

2009 - 2012: No work was performed by ADEQ on the site.

2014: In FY 2014, a total of 8 groundwater monitor wells were installed and a total of 89 groundwater samples were retrieved. A draft RI report was submitted on June 30, 2014.

ADEQ conducted groundwater sampling in 2008 using passive diffusion bag samplers in the monitor wells. The highest concentration of tetrachloroethene (PCE) during the October 2008 sampling event was 98 micrograms per liter (μg/l). ADEQ installed a monitor well within the Gaslight Square retail facility immediately west of the former Rose Formal Wear facility. The results from sampling events indicate the vertical extent of the plume has been assessed in this area. In FY 2014, a total of 8 groundwater monitor wells were installed and a total of 89 groundwater samples were retrieved. A draft RI report was submitted on June 30, 2014.

2015: In fiscal year 2015, a total of 69 groundwater and 3 soil vapor samples were collected. A Remedial Investigation Report and a Feasibility Study Work Plan were finalized.


Contaminants:

The current contaminant of concern in groundwater is PCE. Contaminants of concern at the site may change as new data become available.


Public Health Impact:

There is currently no known threat of direct exposure to the public from the contamination at the site.


Site Hydrogeology:

The site is located within the West Salt River Valley sub-basin of the Phoenix Active Management Area. The Salt River Valley is an alluvial filled basin, located in the basin and range physiographic province.

The site is underlain by sandy and gravelly silt, with some sand and gravel lenses from ground surface to approximately 95 feet bgs. Bedrock is encountered at approximately 95 feet bgs. Based on measurements collected in 2008, groundwater is encountered at approximately 45 feet bgs and flows to the west-southwest.


Contacts:

Name Phone/Fax E-mail
Mel Bunkers, ADEQ Project Manager (602) 771-4556*/ (602) 771-4138 fax [email protected]
Wendy Flood, ADEQ Community Involvement Coordinator (602) 771-4410*/(602) 771-4236 fax [email protected]

*In Arizona, but outside the Phoenix area, call toll-free at (800) 234-5677.


Online Information Repository:

Interested parties can review site information here on this page and at the ADEQ Record Center located at 1110 W. Washington Street, Phoenix, Arizona. Please contact (602) 771-4380 or (800) 234-5677 ext. 6027714380 for hours of operation and to schedule an appointment. To review site information at a location near you, please contact the designated Community Involvement Coordinator.

Site Map

Final Remedial Investigation Report/Feasibility Study Work Plan - Public Notice

Final Remedial Investigation Report

Feasibility Study Work Plan

Proposed Remedial Objectives Report - Public Notice

Notice of 60-day Public Comment Period Regarding Draft Remedial Investigation Report

Map of All East Central Phoenix Plumes/Mapa de todos los penachos de East Central Phoenix

East Central Phoenix Community Involvement Plan (CIP)

Registry Report