Water Quality Assurance Revolving Fund (WQARF) Site

East Central Phoenix (ECP) 32nd 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 32nd Street and Indian School Road WQARF (site) in Phoenix, Arizona has two separate areas of groundwater contamination. The plumes are approximately bounded by East Monterosa Street to the north, 30th Street to the west, Clarendon Avenue to the south, and 32nd Place to the east.

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 boundaries may change in the future, as new information becomes available.


Site Status Update:

In fiscal year (FY)2013 and FY 2014, ADEQ installed soil vapor wells to help delineate the soil vapor plume. Overall, PCE concentrations ranged from less than the method detection limit of 7 micrograms per meters cubed (µg/m³) to 4,100 µg/m³. The soil vapor plume extended from Maroney's Cleaners and the Former Viking Cleaners areas combined, to the southwest of Indian School Road and 32nd Street, and then continued southwest across Fairmount Avenue ending at an area just west of North 28th Street between East Clarendon Avenue and south of East Weldon Avenue.

In 2013 and 2014, ADEQ also went door-to-door to collect indoor air samples from residences located above the soil vapor plume to assess the potential for vapor intrusion. Two events were necessary to evaluate data for seasonal fluctuations and for confirmation. This assessment focused on residences (specifically single-family homes and ground-floor residences of multi-unit buildings), daycares, and schools. Over 130 residents granted access for their indoor air to be sampled. Actual indoor air sample results did not indicate a wide-spread vapor intrusion risk.

The SVE system near Maroney's Cleaners was activated in June 2013 and operated continuously until November 2013. Due to low soil vapor concentrations, the Maroney's system operated infrequently thereafter, until it was deactivated in May 2015 due to low soil vapor concentrations. In FY 2014, construction of the SVE system located behind the former Viking facility was completed and the system activated.

In FY 2015, a total of 4 groundwater and 5 soil vapor monitor wells were installed throughout the site. The Viking SVE system is still in operation. A total of 117 pounds of VOCs were removed at the Maroney and Viking SVE system sites in FY 2015. Site investigation and groundwater well installation will continue throughout FY 2016

Former Viking Cleaners New SVE SystemFormer Viking Cleaners New SVE System
East Central Phoenix 32nd St & Indian School Maroney’s SVE System

Community Involvement Activities:

A community advisory board (CAB) was formed in November 2007. The CAB  meets on a regular basis. 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 gas surveys were conducted at multiple facilities throughout the ECP study area to determine if a release of contaminants to the subsurface had occurred.

1989 - 1994: Two underground storage tanks were removed from Unocal #6453, formerly located at 3201 E. Indian School Road. During an investigation in 1994, a sample of the sludge, from the western waste oil tank, was analyzed and contained 68 milligrams per kilogram (mg/kg) of tetrachloroethene (PCE). Additionally, a soil sample collected from a depth of 12 feet below ground surface (bgs) beneath the same tank contained 13 mg/kg of PCE.

1983 - 1998: Groundwater samples were collected by Salt River Project (SRP) from their well, 17.0E-8.0N, located southwest of 3201 East Indian School Road (formally Unocal #6453). A sampling event, conducted in January 1996, yielded the highest detection of PCE yet observed in the SRP well, a concentration of 82 micrograms per liter (µg/L).

2000: In May, the site was placed on the WQARF Registry with a score of 29 out of a possible 120. In June, a limited Phase II investigation was conducted at the Maroney’s Cleaners facility located at the northwest corner of 32nd Street and Indian School Road. The investigation included a soil vapor survey to 15 feet bgs and the installation and sampling of two groundwater monitor wells. The highest concentration of PCE detected in soil vapor was 15,000 µg/L from a sample collected at 15 feet bgs in the alley just north of Maroney’s Cleaners. The highest detection of PCE in groundwater, 28 µg/L, was observed southwest of Maroney’s Cleaners in the parking area.

2003: In March, an ERA investigation was conducted at the former location of Viking Cleaners at 4029 N. 32nd Street. The ERA included completion of four soil borings (two inside and two outside the former dry cleaning building) and the collection of soil vapor and a groundwater sample. Results of this investigation indicated that a release of PCE had occurred and that the release had impacted groundwater. In April, air samples were collected from inside this building and the adjacent convenience mart. The Arizona Department of Health Services (ADHS) evaluated this data and provided a health consultation that determined there was no risk to employees under current use scenarios.

During a routine groundwater monitoring event, PCE was detected in the SRP well at a concentration of 8.1 µg/L, above the Arizona Aquifer Water Quality Standard (AWQS) of 5.0 µg/l. The maximum PCE concentration observed in a groundwater monitor well west of the SRP well was 3,600 µg/L.

2004: A soil vapor extraction (SVE)/air sparge (AS) system was installed at the former location of Viking Cleaners. The SVE/AS unit became operational in December.

During a routine groundwater monitoring event, PCE was detected in the SRP well at a concentration of 4.6 µg/L, while the maximum PCE concentration observed in a groundwater monitor well southwest of the SRP well was 12,900 µg/L.

2006: An ERA investigation was conducted to determine what contamination remained in soil and groundwater near the Maroney’s Cleaners facility. Three additional groundwater monitor wells were installed within the parking lot area surrounding the Maroney’s Cleaners facility. The initial groundwater samples, collected from the three wells indicated a maximum PCE concentration of 100 µg/L. Soil vapor samples collected during the monitor well drilling had a maximum PCE concentration of 468 µg/L in one well at a depth of 5 feet bgs.

In the spring, as part of a Prospective Purchaser Agreement (PPA), the new property owner of the former location of Viking Cleaners installed four soil vapor extraction wells inside the building. The wells were then connected to the SVE/AS system being operated by ADEQ. ADEQ installed a groundwater monitoring well located west of the building. The initial groundwater samples collected from the well had shallow and deep PCE concentrations of 2.9 and 2.7 µg/L, respectively.

During a routine groundwater monitoring event, PCE was detected in the SRP well at a concentration of 5.0 µg/L, while the maximum PCE concentration observed in a groundwater monitor well southwest of the SRP well was 930 µg/L.

2007: In May, a groundwater monitoring well located south of the Maroney’s Cleaners facility was installed. The initial groundwater samples collected from the well had shallow and deep PCE results that were below the AWQS of 5 µg/L. In June, ADEQ sent out notices per A.R.S. §49-287.03 initiating the RI for the site. The SVE/AS system located at the former location of Viking Cleaners remained operational.

2008: The SVE/AS system at the former location of Viking Cleaners had removed approximately 3,020 pounds of PCE. Since the treatment system had reached the appropriate cleanup criteria, the system was shutdown and removed from the site. In June, ADEQ installed a second groundwater monitoring well located west of the former dry cleaning building within East Fairmont Avenue. The initial groundwater samples collected from the well had shallow and deep PCE concentrations that ranged from 32 to 2,400 µg/L.

ADEQ collected passive soil vapor samples from 40 locations placed within one city block west to southwest of the former location of Viking Cleaners. The qualitative PCE mass observed in those samples ranged from less than 25 nanograms (ng) up to 66,800 ng.

During a routine groundwater monitoring event, PCE was not detected in the SRP well above the AWQS.

2010: ADEQ continued to collect passive soil gas samples from an additional 25 locations placed within one and a half city blocks west to southwest of the former location of Viking Cleaners. The qualitative PCE mass observed in those samples ranged from less than 25 ng up to 546 ng. ADEQ also installed 21 permanent soil vapor monitoring wells along East Fairmont Avenue and North 31st Street. The initial soil vapor samples collected from these wells had PCE and trichloroethene (TCE) concentrations that ranged from less than the laboratory’s reporting limit to 36,000 micrograms per cubic meter (µg/m3) and 210 µg/m3, respectively.

During a routine groundwater monitoring event, PCE was not detected in the SRP well above the AWQS.

2011: ADEQ installed five permanent soil vapor monitoring wells at the former location of Viking Cleaners. The initial soil vapor samples collected from these wells had PCE and TCE concentrations that ranged from less than the laboratory’s reporting limit to 350,000 µg/m3 and 2,400 µg/m3, respectively. ADEQ also installed two SVE test wells, and ten SVE observation wells and conducted a SVE pilot test. The results from the test suggest that SVE could be an effective treatment technology at the former location of Viking Cleaners.

In May, ADEQ installed a groundwater monitoring well west of the former location of Viking Cleaners within the parking lot adjacent to Food City. The initial groundwater sample collected from the well had a PCE concentration of 1,100 µg/L.

Based on the soil vapor sampling results in 2010 along East Fairmont Avenue and North 31st Street, ADEQ installed two SVE test wells, six SVE observation wells and conducted SVE pilot tests in February and December. The results from the tests suggest that SVE could be an effective treatment technology along East Fairmont Avenue and North 31st Street.

In April, ten permanent soil vapor monitor wells were installed north of the Maroney’s Cleaners facility. The initial soil vapor samples collected from these wells had PCE and TCE concentrations that ranged from less than the laboratory reporting limit to 300,000 µg/m3 and 3,800 µg/m3, respectively. As a result ADEQ conducted a SVE pilot test in June. The results from the test suggest that SVE could be an effective treatment technology at the Maroney’s Cleaners facility.

During a routine groundwater monitoring event, PCE was not detected in the SRP well above the AWQS.

SVE system and enclosure
Maroney’s SVE system and enclosure

2012: ADEQ installed three SVE wells at the former location of Viking Cleaners in preparation for the installation of a SVE system. Eleven SVE wells and eight groundwater remediation pilot test wells were installed along East Fairmont Avenue and North 31st Street. An additional groundwater monitoring well was installed south of Fairmont Avenue on 30th Street.

By February, 12 SVE extraction wells and 10 SVE observation wells were installed in preparation for the installation of a SVE system near the Maroney’s Cleaners facility.

During the spring, ADEQ also conducted sampling of the soil vapor monitoring wells throughout the site. Cone Penetrometer Testing (CPT) was also performed throughout the site to investigate current hydrogeologic conditions. Additionally, a routine groundwater monitoring event was conducted.

2013: The SVE system near Maroney’s Cleaners became operational on June 3rd.  ADEQ installed a total of 72 temporary soil- vapor wells to delineate the soil vapor plume.  For the Maroney’s Cleaners facility are, 22 temporary soil vapor wells were installed along the eastern portion of North 32nd Street between East Indian School Road and East Glenrosa Avenue, and at the corner property on East Indian School Road and North 31st Street.  Two temporary soil-vapor wells were installed along the southern portion of former Viking Cleaners. 

In the Fairmont study area, ADEQ installed 12 temporary soil-vapor wells at the northern and southern portions of Fairmont Villa Apartments, four temporary soil-vapor wells at the northern portion of the Lofts of Arcadia, 15 temporary soil-vapor wells within the western portion of Via Seville and 17 temporary soil vapor wells along East Clarendon Avenue (East Weldon Avenue and North 29th Street) immediately east of North 28th Street.  The soil-vapor concentrations of PCE ranged from <20 µg/m3 to 4,100 µg/m3. 

ADEQ also went door-to-door to collect indoor air samples from residents located above the soil-vapor plume to check for vapor intrusion.  Out of 290 homes, 89 participated and granted access for their indoor air to be sampled.

2014: Construction of the SVE systems located near the former Viking’s Cleaners facility was completed in the summer of 2014 and possible construction of an SVE system near the corner of 31st Street and Fairmont Avenue is anticipated to be in 2016. Site investigation and groundwater well installation will continue throughout FY15 and a draft RI report will be submitted by June 30, 2015.

In FY 2014, a total of 13.075 pounds of VOCs were removed at the Maroney’s SVE system site.

  • Total groundwater samples retrieved were: Fairmount – 32, Former Viking – 13, Maroney’s – 23
  • Total soil gas samples retrieved were: Fairmount – 260, Former Viking – 22, Maroney’s – 44
  • Total indoor air samples retrieved were: Fairmount – 274, Former Viking – 41, Maroney’s – 4

2015: A total of 4 groundwater and 5 soil vapor monitor wells were installed throughout the site. Design and implementation of soil vapor extraction (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 will continue throughout FY16.

In FY 2015, a total of 117 pounds of VOCs were removed at the Maroney and Viking SVE system sites.

  • Total groundwater samples retrieved were 183
  • Total soil gas samples retrieved were 19
  • Total soil samples retrieved were 38
Former Viking Cleaners New SVE SystemFormer Viking Cleaners New SVE System
Former Viking Cleaners New SVE System

Contaminants:

The current contaminants of concern in groundwater include PCE and (TCE). Contaminants of concern at the site may change as new data becomes 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. Based on the boring log for SRP Well 17.0E-8.0N, the site is underlain by silty sand and sandy silt with minor gravel lenses from ground surface to approximately 160 feet bgs. Conglomerate rock is encountered at approximately 160 feet bgs and bedrock is encountered at approximately 215 feet. Based on measurements from monitor wells, groundwater is encountered at approximately 55 feet bgs and groundwater flows to the 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

Indoor Air Assessment Fact Sheet

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