Problems/Comments

Source was a 500 gallon heating oil UST. Contamination is at the groundwater interface and may have impacted groundwater. A petroleum sheen was observed in the excavation during the fall of 2001. Maximum DRO concentration left in place is 5,400 mg/kg at 15 feet below ground surface. Removal of contaminated soil left in place closest to Barbara Drive may threaten the stability of the road. Fish Creek crosses the subject property. One crushed 500 gallon UST was discovered at the site of the Former Polar Bear Motel as excavation was conducted for House of Harley's building expansion in September 2001. During expansion of the House of Harley facility in late September 2001, a heating oil underground storage tank (UST) was discovered and removed from the northeast corner of the building footprint. The 500-gallon UST was determined to be the source of contaminated soil and groundwater. The heating oil UST was presumed to have been used by the Polar Bear Motel who previously operated the site. The UST was excavated, which resulted in stockpiling of contaminated soils, soil screening, and sampling of soils. Sample locations F-I, I-I, S-3, and U-B had exceedances for diesel range organics (DRO) above ADEC Migration to Groundwater (MTG) cleanup levels. Sample HOH-1 had exceedances for DRO Naphthalene, and Fluorene above MTG cleanup levels. Groundwater sampling conducted at monitoring well MW-1 exceeded Table C groundwater cleanup levels for DRO in 2002 sampling. All other samples were below ADEC soil cleanup levels. The impacted area is located approximately 150 feet north of, and 50 feet west of the intersection of Spenard Road and Barbara Drive In September 2001, expansion of the House of Harley facility occurred, and a heating oil UST was discovered and removed from the northeast corner of the building footprint. The 500-gallon UST was determined to be the source of contamination to soil and groundwater. The UST was excavated and stockpiling of contaminated soil was performed. Soil screening and samples were collected from the excavation and stockpiled soils for laboratory analysis. Impacted soil from the site was excavated to various depths and as deep as approximately fifteen feet below ground surface (bgs) where the groundwater interface was encountered. Laboratory samples collected from the excavation limits beneath the former UST yielded concentrations of DRO, PAHs, and VOCs above ADEC cleanup levels. Soil that remained within the building footprint was found to be clean through screening, except for at the groundwater interface. Contaminated soil also remained on the eastern sidewall of the excavation west of the Barbara Drive right-of-way. DRO was detected at 5.1 mg/kg to 5,400 mg/kg in samples collected by DOWL in the UST area. Removal of all contaminated soil was constrained vertically by the water table and horizontally by the building footprint and Barbara Drive right-of-way. In October 2002, three soil borings and one direct push microwell were installed. Soil samples were collected, and field screened from three of the borings which were all completed as monitoring wells. Soil samples from two borings, MW-3 and MW-4, were submitted for laboratory analyses. Soil samples collected from MW-3 and MW-4 met MTG soil cleanup levels for DRO, Benzene, Toluene, Ethylbenzene, and Xylene (BTEX) compounds. MW-1, located east of the former UST in the Barbara Drive right-of-way, exceeded the Table C groundwater cleanup level of 1,500 µg/L for DRO at 2,240 µg/L. Monitoring wells MW-2, MW-3 and MW-4 yielded detectable levels of DRO in groundwater samples with results well below ADEC cleanup levels. Groundwater gradient was mapped and indicated a southeast gradient toward MW-1. The four monitoring well locations are shown on. In August 2020, the wells were recovered, groundwater sampled, and elevation measurements from MW-1 through MW-4 were taken. Groundwater elevations and contour mapping show the groundwater gradient in the parking lot area north of the House of Harley building in the vicinity of wells MW-2, MW-3, and MW-4 to be relatively flat, and the groundwater flow on the east side of the parking lot to be from MW-2 towards MW-1. It is possible that MW-1 groundwater elevations may be subject to the influence of underground utilities in Barbara Drive or some other factor. It was noted that in some cases, shallow groundwater can channel along permeable pipe bedding provided in buried utility trenches. The groundwater elevations in the parking lot were relatively level with a slight gradient towards Fish Creek. While the parking lot groundwater gradient is flat, groundwater elevations on the east side of the property showed a relatively steep gradient from MW-2 to the southeast towards MW-1. Four wells were sampled for DRO, GRO, PAHs, and VOCs. DRO was detected in all four monitoring wells. The sample from MW-2 was the only DRO exceedance above the ADEC Table C groundwater cleanup level of 1,500 µg/L. All other results were below Table C groundwater cleanup levels for all other contaminants. Monitoring well MW-2 yielded DRO at 1,820 µg/L compared to a cleanup standard of 1,500 µg/L. Additionally, 1,2-Dichloroethane was also detected at MW-2, however it was an estimated value detected well below the cleanup level and below the LOQ. MW-2 was well below the cleanup for all other contaminants. Results from MW-1 and duplicate sample MW-X were below Table C groundwater cleanup levels for all contaminants. DRO was detected at 1,180 µg/L in both the primary and duplicate sample, below the 1,500 µg/L Table C groundwater cleanup level. Additional detections at MW-1 above the limit of quantitation (LOQ), but substantially below cleanup levels were reported for the following contaminants: GRO, Isopropylbenzene (Cumene), n-Butylbenzene, sec-Butylbenzene, tert-Butylbenzene, 1-Methylnaphthalene, Acenaphthene, and Fluorene. MW-1 was well below the cleanup for all other contaminants. Monitoring wells MW-3 and MW-4 yielded DRO results of 0.666 mg/L and 0.664 mg/L respectively, below the 1,500 µg/L Table C groundwater cleanup level. Both wells yielded GRO at estimated values well below the 2,200 µg/L Table C groundwater cleanup level. MW-3 and MW-4 were well below the cleanup for all other contaminants. In May 2021, groundwater sampling and elevation measurements of well MW-1, MW-2 MW-3, and MW-5 occurred. MW-1 was sampled for DRO and all other wells were sampled for DRO, GRO, PAHs, and VOCs. DRO was detected in all four monitoring wells. All well samples were well below Table C groundwater cleanup levels for all contaminants analyzed. In September 2021 groundwater sampling and elevation measurements of well MW-1, MW-2, and MW-6. MW-1 was sampled for DRO and all other wells were sampled for DRO, GRO, PAHs, and VOCs. DRO was detected in all three monitoring wells. All well samples were well below Table C groundwater cleanup levels for all contaminants analyzed.

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