Problems/Comments

During a facility upgrade and removal of a used oil tank in 1996, 45 cubic yards of petroleum contaminated soil was excavated and transported off-site for thermal treated. Monitoring wells were installed in 1997 and 1999 to evaluate the nature and extent of contamination from the release. In 2005 the remaining three gasoline tanks and one diesel tank and their associated piping were removed. During the 2005 removal, 50 cubic yards of petroleum contaminated soil was excavated and transported off-site for thermal treated. Later in 2005 the site monitoring well were decommissioned in accordance with an approved plan. In 2013, five soil borings and temporary monitoring wells were sampled. All samples (including groundwater samples for MTBE) met default cleanup levels. Groundwater samples collected from the wells contained up to 2.77 mg/l DRO, 21.9 mg/l GRO, 1,160 ug/l benzene, 20.4 ug/l 1-2 Dichloroethane, and 95.8 ug/l MTBE. Previous soil samples on property had contained up to 7,880 mg/kg DRO, 34,600 mg/kg RRO, 253 mg/kg GRO, and 0.22 mg/kg benzene. Groundwater samples collected in 2005 and 2013 did not contain contaminants above cleanup levels. Water samples collected from the nearby drinking water well did not contain detectable concentrations of petroleum contaminants. Soil samples collected in 2005 and 2013 from soil borings on the property did not contain contaminants above cleanup levels. Five borings was sampled on the property on April 22 and April 23, 2013. Groundwater amples were collected from temporary monitoring wells after they were developed and purged. Soil and groundwater samples were collected at each location. All samples meet default cleanup levels. Based on available sample data all soil and groundwater on the property meets default cleanup levels. On May 3, 2010 through May 7, 2010 contamination was found in the road right of way during the installation of new storm sewer pipe to the west of the 4409 Lake Otis property. The contamination extended in the new right of way from west of the former dispenser island to an old log crib that was connected to the former service station to the east. Between October 15, 2012 and October 23, 2012 nine soil borings were sampled in the Lake Otis Parkway right-of-way to the west of the 4409 Lake Otis property. Up to 5,900 mg/kg GRO, 2,800 mg/kg DRO, 2,700 mg/kg RRO, 1.1 mg/kg benzene, 46 mg/kg toluene, 61 mg/kg ethybenzene, 500 mg/kg xylenes, 1.6 mg/kg 1,1,2-TCA, 1.5 mg/kg carbon tetrachloride, 0.61 bromodichloromethane, and 0.23 1,2-DCA. PCE and PCBs were non detect. The metals appeared to be at naturally occuring concentrations. Contamination was found in the borings between 5 feet and 34 feet below ground surface and appears to extent to groundwater at several locations. Historically groundwater has been encountered at 21 to 27 feet below ground surface with a flow direction to the northeast. This right-of-way contamination is managed under a separate contaminated site (file number 2100.38.542).

Action Information

Contaminant Information

Control Type

Requirements