2024: A soil vapor extraction (SVE) system and designed and installed in the area identified as having the highest soil gas concentrations at the Site. The Draft Remedial Investigation (RI) Report was prepared to summarize the remedial investigation activities.

2023: Additional remedial investigation activities were conducted to fully deliniate the soil gas and groundwater plumes, and further evalaute Lake Havasu.

2022: Remedial investigation activities including monitoring well drilling, soil and soil gas sampling, and lake water sampling were conducted. An Early Response Action was conducted to remove a former waste oil clarifier pit. 

2021: After completing a Preliminary Investigation, ADEQ listed the site on the WQARF Registry on Sept. 16, 2021.

2020: A limited site investigation was performed by ADEQ to confirm the releases of volatile organic compounds (VOCs) to soil, soil gas and groundwater. Several monitoring wells were installed to sample groundwater. Tetrachloroethene (PCE) and trichloroethene (TCE) were present in groundwater at levels that exceeded their Arizona Aquifer Water Quality Standard (AWQS) of 5 micrograms per liter (μg/L). TCE was the most extensively detected compound above AWQS, with a maximum concentration of 2,650 μg/L. In one sample, the heavy metal thallium was detected at an estimated concentration above its AWQS of 2 μg/L.

The purchaser of 530 North Lake Havasu Avenue entered into a Prospective Purchaser Agreement (PPA) with ADEQ.

2019: A prospective purchaser for the property located at 530 North Lake Havasu Avenue contacted the WQARF program to determine what work may have been conducted at this property by ADEQ. A Phase II assessment conducted by the prospective purchaser confirmed arsenic remained in shallow soil in this area above its Soil Remediation Level (SRL) of 10 milligrams per kilogram (mg/kg).

2001 – 2004: ADEQ prepared a Preliminary Assessment/Site Inspection at the property for the U.S. Environmental Protection Agency (EPA) in 2001, and an expanded Site Inspection for the EPA in 2004. These investigations found TCE and PCE in soil and soil-gas samples collected at this property. In groundwater, TCE and PCE were detected above the AWQS of 5 μg/L. The highest groundwater concentration of TCE detected was 1,400 μg/L during a 2003 sampling event. In addition, arsenic exceeded its SRL of 10 mg/kg in several shallow soil locations.

1960s – 2000: Several commercial and industrial companies operated at the site, including manufacturing, die-casting, metal finishing and chrome plating.