Laserfiche WebLink
l` <br /> reason, it does not appear that the methanol is a significant <br /> environmental concern at the site <br /> In addition, TPH-D was detected in several samples this quarter However, <br /> the laboratory stated that the chromatogram patterns were not related to <br /> diesel or any other petroleum hydrocarbons The laboratory speculated <br /> that these concentrations may be related to plastics in either the well <br /> casing or sampling equipment or possibly from cleaning detergents used <br /> to clean the pump Since the laboratory stated that these concentrations <br /> are definitely not related to diesel or other petroleum hydrocarbons, ASE <br /> does not consider these concentrations to be a significant environmental <br /> concern at this time Several equipment blank samples will be collected <br /> during the next sampling period in the event that similar results are <br /> encountered <br /> The benzene concentration detected in groundwater samples collected <br /> from monitoring wells MW-5, MW-13, and MW-19 exceeded the California <br /> Department of Health Services (DHS) maximum contaminant level (MCL) <br /> for drinking water The toluene and total xylene concentrations detected <br /> in groundwater samples collected from monitoring wells MW-5 and MW-6 <br /> exceeded the DHS MCL for drinking water The MTBE concentrations <br /> detected in groundwater samples collected from monitoring wells MW-5, <br /> MW-13, MW-14, MW-19, and MW-20 also exceeded the DHS MCL for <br /> drinking water <br /> Monitoring wells MW-6 and MW-20 continue to shown a consistent <br /> decreasing trend in hydrocarbon concentrations Hydrocarbon <br /> concentrations detected in groundwater samples collected from <br /> monitoring wells MW-13, MW-14, and MW-19 have shown a substantial <br /> decrease since the previous sampling period Monitoring well MW-5 did <br /> not contain any free-floating hydrocarbons during this quarter, indicating <br /> a general reduction in hydrocarbons in that well Toluene, ethylbenzene, <br /> and total xylenes have increased from "non-detect" in monitoring well <br /> MW-3 since the last quarter MTBE and TBA continue to be present in <br /> trace amounts in monitoring well MW-8 Low concentrations of TBA have <br /> appeared in wells MW-10 and MW-12 <br /> Overall there was a decrease in MTBE concentrations throughout the <br /> majority A the site <br /> s <br /> Frank's One Stop Quarterly Report — March 2001 Sampling <br /> -4- <br />