Payson PCE | WQARF Site

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Payson PCE | Site History: Page 2 of 2

1999 - 2006: PCE concentrations were detected at approximately 760 micrograms per liter (µg/l) in December 1999 from a monitor well close to the source area. The concentration decreased to approximately 50 µg/l in September 2006.

2003: In January, the IGTS was turned off and the SVE system was decommissioned. The feasibility study (FS) was completed in May. The proposed remedial action plan (PRAP) was completed and ADEQ responded to comments. During operation of the IGTS, 59.5 million gallons of water were treated and 218 pounds of VOCs were removed.

2001 - 2002: In 2001, two additional groundwater extraction wells, EX-l and EX-2, were drilled and constructed to provide additional capture of the plume. A soil vapor extraction (SVE) system was constructed to remediate contaminated soils in the source area in 2001 and was operated until October 2002.  In June 2002, the remedial investigation (RI) report was finalized. 

1999: In September, three abandoned underground storage tanks (USTs) located at the source area were removed. Soil sampling and soil vapor sampling were conducted, and three nested vapor monitor wells were constructed and sampled.

1998: In March, a wellhead treatment system was constructed at the Town production well. The site was added to the WQARF Registry on April 28, with an eligibility and evaluation score of 63 out of a possible 120. In October, the IGTS and EGTS became operational and began treating and delivering water to the Town.

1997: In August, the EGTS construction began to remediate groundwater downgradient of the source area. In December, a 90-day operational test was conducted using the completed IGTS.

1996: In September, the IGTS was constructed to remediate groundwater at the source area. From 1996 to 1998, ADEQ installed groundwater monitor wells to define the extent of groundwater contamination.

1995: In June, ADEQ removed the septic tank system and surrounding soils as an early response action (ERA) under WQARF.

1993: ADEQ conducted a preliminary assessment/site inspection which identified the Old Payson Dry Cleaners, located at 904-906 S. Beeline Highway, as a potential source of contamination. The Old Payson Dry Cleaners operated at the 904-906 S. Beeline Highway location from 1976 to 1984.

1990: The Town collected samples from four future production wells (TOP-4, TOP-5, TOP-19, and TOP-20). PCE was detected in two of the production wells (TOP-4 and TOP-5) at 13,600 µg/l and 542 µg/l, respectively. The site was identified as a potential WQARF site in 1990.