1600 MADISON ST 2016-01-01 MF Import

4.1.1 Analytica/ Resu[ts, Monitoring Wells G-Logics submitted a water sample collected from VW-2 for petroleum-hydrocazbon analyses. This sample was collected on October 27, 2000. Malytical results indicate the presence of petroleum hydrocarbons, quantified as gasoline, at a concentration of 6,600 ug/I. Benzene was not detected in the sample (detection limit of 10 ug/1), but ethylbenzene, toluene, and xylenes were detected at concentrations above the current MTCA Method A Cleanup Levels. MTBE was not detected (<50 ug/1) in the analyzed sample. When comparing the contaminant concentrations to the proposed Method A Cleanup Levels presented in the latest draft addendum to MTCA (August 2000), only the gasoline concentration exceeds the proposed cleanup levels (Table 2). Furthermore, the new Method A Cleanup I.evel for gasoline assumes that groundwater is or will be used for drinking- water purposes. 4.3 Quality Assurance/Quality Control Findings The laboratory conducted matrix spike, matrix-spike duplicate, and method blank analyses. Laboratory QA/QC information is included (with the laboratory report) in Appendix D. 5.0 CONCLUSIONS Information regazding the Phase II findings and our conclusions conceming the potential presence of soil and/or shallow groundwater contamination on the subject property is presented below. • The completed borings generaily encountered very dense glacial rill soils to a depth of approximately 37 feet, where advance outwash sands were discovered. • Free groundwater was not encountered in any of the borings. However, moist soils were occasionally discovered in thin disconrinuous lenses located above finer-grain soil layers. . No evidence of immiscible petroleum product, sheens, or strong odors was noted in any of the completed borings. Faint gasoline-like odors were noted in a few scattered samples collected from the two borings closest to the gasoline release, but the odors were not consistent throughout the explored depths. ., ;: 01-0IOSL-RT.doe �, � S�OQICS Copyright 2001 G-Logics, Ine. Pege 10 oC 14 ��