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4.0 SITE EXPLORATION OBSERVATIQ�NS AND FINDINGS <br />The findings of this site exploration are presented below. Summaries of the analytical <br />results obtained duri�g this exploration arc presented on Tables I and 2. The analytical <br />laboratory report for the analyzed soil samples is attached in Appendix D of this report. <br />Chain-of custody forms aze also included in Appendix D. <br />4.1 Soil Boring Findings <br />The seven borings drilled during the site exploration were advanced to depths ranging from <br />approximately 6 to 60 feet below ground surface. These borings gene:ally encountered well- <br />graded (poorly sorted) silts, sands, and gravels to a depth of approximatcly 37 feet (glacial <br />till). At this depth, poorly graded (well sorted) sands with some small gravels were <br />discovered (advance outwash sands). Thin stringers of fine-gi�ained sediments were preser.t <br />witb.in the sand layer. Fre,• groundwater was not encountered in any of the borings. <br />However, thin layers of moist soils were discovered (above these finer-grain layers) at <br />localized depths, as indicated on the boring logs. <br />Boring ;ocations aze presented on Figure 2. The boring logs aze presented in Appendix C. <br />Each log presents soil types and descriptions, sampling intervals, soil-density information, <br />field observations, noted odors, and a schemaHc of any monitoring ;vell installed. <br />4.1.1 Analylical Resu/ts, Soil Borings <br />G-Logics submitted soil samples &om the two borings located closest to the former gasoline <br />UST location. The sar.�ples were submitted for petroleum-hydrocarbon analyses. Of the <br />three samples submitted from BI-I-S and the five samples submitted &om BH-7, only two <br />cor.tained detectable concentrations of petroleum hydrocarbons. Toluene was discovered at <br />a concentration of 0.2 mg/kg at a depth of 45 feet in BH-6. Petroleum hydrocazbons, <br />quantified as gasoline, were detected at a concentration of 7 mg/kg in the 20-foot sample <br />from BH-7. These detected wncentrations do not exceed MTCA Method A Cleanup <br />Levels. <br />4.2 Monitoring Well Findings <br />As stated above, groundwater was not discovered (as measued on several occasions) in the <br />two newly installed monitoring wells. However, water was discovered in existinK vapor <br />monitoring wel;, VW-2. <br />01-0105-C•RT.doc �. i( Sl�y��L's <br />CoPyridht 2001 G.Logics. Inc. Page 9 of I4 �J ✓ <br />