ARCHIVED REPORTS XR0000993 - Laserfiche WebLink

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MTBE has been detected only in MW-5, that well was placed by the owners of the site to the east, (Nomelhni) for the purpose of locating the limits of a plume caused by leaking UST's at that location Chloronated solvents have been identified in MW-4 (methylene chloride,) MW-7 (Trichloroethene) MW-8 (1,1-Dichloroethene & vinyl chloride,) and MW-9 (1,2- Dichloroethane ) TABLE A summarizes the results of the laboratory analyses of water samples taken since the start of monitoring operations Levels of BTEX are very high in MW-5 & MW-9, those two wells are within the plumes originating to the east & west of the property MW-1, MW-3, & MW-4 have recorded varying levels of BTEX, those wells are within the boundenes of the two plumes MW-2, MW-6, & MW-7 are at the edge of, or outside the contaminated areas Levels of TPH as gasoline have been measured at very high concentrations in both MW-5 &MW-9, it has been either ND or at varying low levels in the other wells TPH as diesel has been measured only in MW-4, which is located close to the site of the removed diesel UST's MTBE has been detected only in MW-5 Chloronated solvents have been detected in MW-4, MW-7, MW-8, & MW-9, see TABLE A for compounds identified DISCUSSION OF RESULTS TO DATE FROM MONITORING WELLS: The work performed to date has verified the existence of two gasoline contaminated plumes wluch originate off the property, one at 1045 W Charter Way (Nomellim) & one at 1245 W Charter Way (JM Equipment ) Although data to date is not conclusive, it is possible that the two plumes have commingled in the area of the shop building Those two plumes have impacted the groundwater beneath MW-1, MW-3, MW-4, MW-5, MW-8, & MW-9 MW-2, MW-6, & MW-7 appear to be outside the areas of contamination TPH as diesel has only been detected in MW-4, that well is located close to the site of the removed diesel UST's which revealed minor amounts of soil contamintion That well is within the plume originating at the Nomellini site to the east, and any attempt at cleanup is not feasible at this time Chloronated solvents (EPA 8010) have been detected in four wells No consistent pattern has yet emerged to determine the source or sources of those compounds Further analysis may assist in resolving that issue RECOMMENDATIONS: Based upon the data obtained to date, we plan to implement the following changes in our field procedures 2