PUBLIC NOTICE | Proposed Leaking UST Case Closure for Case File 0587.02

ADEQ is considering closure of the following leaking underground storage tank (LUST) case:

LUST Case File No.: 0587.02

Facility ID No.: 0-004861
La Paz County

Facility address: 
Former Ted's Truck Stop
965 W. Main Street
Quartzsite, AZ 85346

Information

The former Ted’s Truck Stop was located at 965 West Main Street in Quartzsite and encompassed approximately 15 acres over several parcels: 306-027-34B (965 W. Main St. which was part of parcels 306-027-32 and 306-027-34), 306-027-35C (1035 W. Main St.), and 306-29-005B (1067 W. Main St.).  The facility is currently not in operation, but based on historical aerial photographs, reports, and interviews with local residents, the site facilities consisted of two large refueling areas, two tire service areas, a restaurant, two mobile homes, and two modular office buildings. The eastern portion of the site has been used seasonally as a trailer and recreational vehicle dealership. The canopy for the dispenser area and several buildings remain on the eastern portion of the site. The western portion of the site is mostly vacant with remnants of the previous developments associated with the truck stop operations. This LUST site is located to the southwest of the closed Tyson Wash Water Quality Assurance Revolving Fund (WQARF or state Superfund) site where the contaminants of concern (CoCs) were tetrachloroethylene (PCE) and trichloroethylene (TCE).

According to documentation in the WQARF project files, there have been an estimated six above ground storage tanks (ASTs) and two underground storage tanks (USTs) in service at the site at different times between 1976 and 1998. The USTs on the site were located on parcel 306-027-35C and contained gasoline and diesel fuel. Approximately 12,000 gallons were stored in each tank. The USTs were in service from 1978 until they were removed in 1998. UST closure activities were completed by the property owner in 1998. An investigation of the UST tank pit and associated piping was completed in 2000. The UST owner/operator was identified as Ted’s Truck Center Inc. #1.  LUST release .01 was assigned in 1989 but closed in 1993. LUST release .02 was assigned to the two USTs in July 2000.   ADEQ was notified in 2000 that the water from a private domestic well near the Ted’s Truck Stop site had a gasoline odor.  In response to that complaint, the UST program initiated sampling of approximately 20 domestic wells in the area. Two of the domestic wells had detections of benzene above the Aquifer Water Quality Standard (AWQS) of 5 micrograms per liter (µg/L). Three of the domestic wells also had detections of toluene, total xylenes, naphthalene, and oil range organics.  ADEQ issued bottled water to the private residences affected by the contamination.  In May 2004, ADEQ again sampled private domestic wells near the Ted’s Truck Stop site. Petroleum hydrocarbon contamination was found in three domestic wells in the sampled area. Results indicated that 2 wells were above the AWQS of 5 µg/L for benzene and the third well indicated a concentration of benzene at 3.6 µg/L.

In June 2004, ADEQ’s WQARF program began a preliminary investigation of the Ted’s Truck Stop property and the site was renamed Main Street and Kofa Avenue. Results indicated that there was wide spread petroleum hydrocarbon contamination in the groundwater across the entire site. Groundwater beneath the site was contaminated with benzene above the AWQS. Free product consisting of diesel and gasoline has been detected in four wells on site. Total petroleum hydrocarbons (TPH) in soil are present above the non-residential soil remediation level (nrSRL) of 18,000 mg/kg. Benzene concentrations have been detected in soil above the residential soil remediation level (rSRL) of 0.62 mg/kg, but below the non-residential SRL of 1.4 mg/kg. ADEQ conducted investigation and remediation activities at the site under the WQARF program until 2012. Remediation activities included installation and operation of a soil vapor extraction (SVE) system, an ozone sparge system, and a groundwater pump and treat system (GWE). The remedial system was shut down in 2012 when the WQARF program determined that funding could no longer justify further operation of the remedial system and all was removed in June 2014. The site had 23 groundwater monitoring wells (TTMW-18 was abandoned in 2012 due to property redevelopment), 20 dual phase extraction wells of which 14 had operating pumps, 5 SVE wells, and 19 ozone sparging wells.

The State Lead Unit continued site characterization of the groundwater with the installation of eight monitoring wells (SLUMW-1 through MW8) in 2014. Remediation of the groundwater continued with a new ozone sparge system and also using PersulfOx®, which promotes rapid and sustained in situ oxidation of a wide-range of organic contaminants like petroleum hydrocarbons. Injections into specific monitoring wells occurred between August 2014 and February 2017.  In April 2014, three soil confirmation borings were installed to a depth of 45 feet bgs, and were located at the former tank pit and at two dispensers.

Data provided by TetraTech, contractor to the State Lead Unit, and all other available site information has been used by ADEQ to determine whether remaining levels of contaminants at the site are adequately protective of human health and the environment.

A site specific risk assessment and detailed file/information search were also completed.  VOC analytical groundwater results in SLUMW-8 show that benzene concentration remain above the applicable AWQS of 5.0 µg/L. VOC analytical data groundwater results in TTMW-12 show that methyl tert butyl ether (MTBE) concentrations remain above the applicable Tier 1 Corrective Action Standard of 94 µg/L. The results for all other monitoring wells show no contamination present over applicable regulatory standards and the data is available in the LUST file.

Based upon the results of remedial activities and site specific information, the above-referenced LUST site is eligible for alternative LUST closure under Arizona Revised Statutes (A.R.S.) §49-1005(E).  Arizona Administrative Code (A.A.C.) R18-12-263.04 allows case closure of a LUST site with groundwater contamination above the Arizona AWQS or Tier 1 Corrective Action Standards.

Review Document 

Review results of remedial activities and entire public notice | View/Print >

Public Comment Period 

Dates: August 17, 2018  September 17, 2018

Comments may be submitted as follows:
     By Email | Send Email > 
     By Mail (Must be postmarked or received by September 17, 2018):

       ADEQ
       Debi Goodwin
       Waste Programs Division
       1110 W. Washington Street
       Phoenix, AZ  85007 

Documents may also be reviewed in person at the ADEQ Record Center | Learn More >