16th Street and Camelback
The 16th Street and Camelback WQARF site is located in Phoenix, Arizona. The contaminated groundwater plume is bounded by Camelback Road to the north, Highland Avenue to the south, 17th Street to the east, and 15th Street to the west.
The plume boundaries depicted on the site map represent the Arizona Department of Environmental Quality’s (ADEQ) interpretation of 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.
ADEQ has completed the remedial investigation (RI) and feasibility study at the site. ADEQ has continued groundwater monitoring and sampling from 1996 to the present. Based on the February 2015 groundwater sampling event, the current highest concentration of tetrachloroethene (PCE) in groundwater is 12.9 micrograms per liter (µg/l). The sampling results for and 1,2-dichloroethane (DCA) and 1,2-dichloropropane (DCP) continue to show no concentrations above laboratory reporting limits. The Arizona Aquifer Water Quality Standard (AWQS) for PCE, 1,2-DCP, and 1,2-DCA is 5.0 µg/l. The southern plume appears to have naturally attenuated.
A community advisory board has been formed for this site and meets on a regular basis. This site is part of the Central Phoenix CAB, a combined CAB that meet to discuss this and other neighboring sites. These meetings are open to the public. Details of CAB meeting agendas and minutes can be viewed at the ADEQ website.
1994: A Consent Decree was signed in January, between Bank One and ADEQ. Bank One paid a settlement to ADEQ to be used for the investigation and clean up of the property. Six monitor wells were installed
1995: ADEQ conducted a soil vapor survey. PCE concentrations were detected in soil from 1.3 to 2.3 µg/l.
1996: ADEQ installed four additional permanent groundwater monitor wells and four temporary groundwater well points.
1999: The site was added to the WQARF Registry on April 21st with an eligibility and evaluation score of 23 out of a possible 120.
2002: In May, ADEQ began an ERA evaluation at the site. The ERA evaluation was designed to determine if soil vapor extraction and air sparge remediation was feasible to provide source control and remediate the PCE groundwater contamination.
2003: In January, ADEQ installed two vapor extraction wells, one sparge point and two observation wells. A pilot study was conducted to determine the feasibility of installing a vapor extraction/air sparge remediation system. In April, ADEQ received the results from the pilot study and requested that an ERA completion report be prepared. The results of the pilot study indicated that installation of a remediation system at the site is not feasible or cost effective.
2004 - 2006: An ERA completion report was completed. Groundwater monitoring of the well network continued at the site. There were 13 wells monitored and sampled on the site as part of the monitoring well network. Passive diffusion bags are used at the site, due to a drop in the depth of groundwater. Passive diffusion bags were first used during the 1st quarter 2004 sampling event.
ADEQ installed an additional well (MW-12) in January 2004, on the property located on the southwest corner of 16th Street and Camelback. The purpose of the well was to aid in defining the down gradient extent of PCE contamination. Due to declining water levels, in April 2006, ADEQ installed well MW-3A to replace well MW-3. The purpose of well MW-3A is to collect contamination data from the source area of the southern plume.
The highest concentration of PCE in groundwater at the site was 89 µg/l based on the August 2006 sampling event. The highest concentration of 1,2-DCA in groundwater was detected at 7µg/l. No concentrations of 1,2-DCP were detected above laboratory reporting limits.
2007: Based on the October groundwater sampling event, the highest concentration of PCE and 1,2-DCA in groundwater was 24 µg/l and 3.4 µg/l, respectively.
2008: ADEQ continued to sample the northern and southern groundwater plumes.
2013: Based on the May groundwater sampling event, the highest concentration of PCE in groundwater was 31.9 µg/l. Groundwater samples for 1,2-DCA concentrations remain below the laboratory detection limit. ADEQ is in the process of installing two groundwater monitoring wells to further define the down gradient extent of PCE contamination of the North Plume.
2014: Two groundwater monitoring wells were installed at the site to delineate the downgradient extent of the northern plume. Groundwater samples were collected from all of the site wells that could be accessed in February and April. Based on the April 2014 groundwater sampling event, the current highest concentration of PCE and DCA in groundwater is 13.3 micrograms per liter (µg/l) and 0.62 µg/l, respectively. The sampling results for DCP continue to show no concentrations above laboratory reporting limits.
2015: ADEQ finalized the RI report, FS work plan, and the FS report. Groundwater monitoring and sampling was conducted in February and March 2015. The sampling results show that contaminants of concern are continuing to attenuate.
The site was divided into a northern and a southern portion. The current contaminants of concern in groundwater include PCE at the northern portion of the site. DCP and DCA were contaminants of concern in the former southern portion of the site, however these two contaminants are no longer present at concentrations greater than their AWQS. Contaminants of concern at the site may change as new data become available.
No one is known to be at risk of exposure to these contaminants. The contaminated groundwater is not used for drinking water purposes. Drinking water provided by the City of Phoenix is tested regularly to ensure that it meets all state and federal water quality standards.
According to data collected from Salt River Project, the regional groundwater flow direction beneath the site has changed from southwest (1948, 1953), to northeast (1960, 1973), to northwest (1968), and to the west (1978). The direction of groundwater, as of February 2015 was 0.003 feet per foot (ft/ft) to the west northwest.
Historically, groundwater occurs at a depth of approximately 75 feet below the ground surface. Groundwater level monitoring in February 2015 has shown that, since July 2007, groundwater levels have declined by an average of approximately 2 inches.
*In Arizona, but outside the Phoenix area, call toll-free at (800) 234-5677.
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.