ARCHIVED REPORTS_MONITORING WELL INSTALLATION REPORT - SITE ASSESSMENT WORK PLAN

Home Browse Search

Historical Background: River er City Petroleum and Connell Motor Lift Truck ' Page 5of13 • A total of ten ground water observation wells have been installed and monitored as part of ' the UST site investigation.The lateral extent of the dissolved hydrocarbons has been defined to the east and south by the well network. PREVIOUS SITE ASSESSMENT In November 1998, AGE conducted a site visit/reconnaissance of the property as part of a Phase I site assessment for a potential property transfer/assessment; there were no regulatory directives in ' effect for the property at that time.AGE identified several general areas of potential environmental concern, which included a motor oil storage or waste oil transfer area indicated by the previously mentioned above-ground storage tank and two circular depressions on the western edge of the ' building on the site. The subsequent site-investigation activities included soil borings in 1999, cone penetrometer tests (CPTs) in 2000, ground water monitoring well installations in 2001 and vapor well installation in ' March 2004. • February and August 1999 -Phase VII and Preliminary Site Assessment On 03 February and 27 and 28 August 1999, AGE advanced 30 soil borings (P1 through P29 and M 1), and collected one `grab' ground water sample at the site to assess for petroleum hydrocarbons in the subsurface. ' • Total petroleum hydrocarbons as gasoline and stoddard solvent (TPH-g and TPH-ss) and various aromatic hydrocarbon compounds were detected in soil samples collected from an ' area along the western edge of the former lift truck building on the site(P14,P24,P25 and P27);however,each detection of TPH-g was qualified with a notation that the pattern did not appear to be gasoline, but TPH-ss. TPH-ss was detected in the area of P14 at depths of 10 feet to 65 feet bsg at concentrations as high as 8,000 mg/kg; analyzed soil samples collected from depths of 20 feet to 55 feet bsg also contained elevated concentrations of TPH-ss,with significant concentrations detected at 45 feet and 55 feet bsg. TPH was detected in soil ' underlying the western area of the former lift truck building at depths of 10 feet to 65 feet bsg and at concentrations up to 6,300 mg/kg. Aromatic hydrocarbon compounds were detected at depths of 25 feet to 55 feet bsg at concentrations as high as 44 mg/kg(P 14,P24,P25 and ' P27); however, benzene was not detected in any of the soil samples analyzed. • Chlorinated volatile organic compounds (generally VOCs), specifically tetrachloroethene (PCE), were detected in three soil samples collected from between 45 feet to 55 feet bsg. • PCE was detected at a maximum concentration of 68 micrograms per kilogram (gg/kg) in soil samples collected from depths of 45 feet to 55 feet bsg. 1,2-DCE was detected in soil Advanced GeoEnvironmental,Inc.