ARCHIVED REPORTS_XR0009036 - Laserfiche WebLink

Home Browse Search

' Ripona Market Vertical Groundwater Investigation II Report Page. 4 interpretation with selected samples submitted for laboratory analysis Laboratory groundwater samples were collected at 45 and 60 feet in depth with use of the Simulprobe sampling device All laboratory soil samples were below detection limits ' for the compounds analyzed Low levels of gasoline, toluene, and MTBE were present in the 45-foot water sample High levels of ethanol were also detected in the 45-foot and 60 feet water samples collected with the Simulprobe ' Boring B-5 was drilled on January 22, 2003 at the southeast corner of the Ripona Market store building This boring was extremely difficult to sample because of the ' unconsolidated heaving sands below the water table A grab water sample was collected at 30 feet in depth through the hollow stem augur An attempt to sample with the Simulprobe was made at depths of 45 and 55 feet Once the bit was removed ' for the Simulprobe sampling device, loose sand flowed into the augur The driller was unable to push the Simulprobe sampler out of the bottom of the augur to collect a discrete water sample However, the soil sample collected in the Simulprobe was ' retrieved and analyzed A soil sample was also collected from the bottom of the drill bit at approximately 56 feet in depth and submitted for laboratory analysis All laboratory soil samples collected from this boring were reported non-detectable concentrations for the compounds analyzed The water sample collected at 30 feet contained high concentrations of ethanol Boring B-6 was drilled on January 23, 2003 in the alley west of the Ripona Market facility The boring was advanced with difficulty to 60 feet due to heaving sands with water samples collected by the Simulprobe at 45 and 60 feet A grab water sample ' was collected through the augur at depths of 30 to 35 feet All soil samples reported contamination levels below laboratory detection limits for the compounds analyzed The 35 and 45-foot water samples contained levels of ethanol 1 An attempt to locate a seventh boring in the driveway of a rental house adjacent to the Ripona market and east of the former UST site was made by the driller Due to overhead electrical and safety concerns, a boring was not constructed in the driveway Ethanol was detected in all but one of the water samples and not detected in any of ' the groundwater samples collected from the existing monitoring wells or Geoprobe samples, it appeared that the samples may have been cross contaminated during collection Throughout the January 2003 hollow stem augur drilling, the driller ' liberally used a vegetable base oil to lubricate the augur connections, drilling rod threads and the threaded portions of the Simulprobe sampling device The driller used "PAM"vegetable oil spray as a lubricant PAM contains grain alcohol (ethanol) ' as a base or carrier for olive oil in a pressurized canister for use in cooking The olive oil can also give a false positive for diesel unless a silica gel cleanup is used to remove plant oils The dnller has been asked to discontinue this practice or find ' another lubncant 1 1