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r , <br /> 1/9/91 Letter from RP - Wells dry. Consultant to do vapor extraction <br /> testing on monitoring wells. <br /> 3121191 Work plan for vapor extraction well. <br /> 5128191 Received Interim Corrective Action Plan <br /> 6/11/91 Vapor extraction well installed. <br /> i <br /> 7/10191 Sampling of soil generated from installation of monitoring wells and <br /> vapor extraction well. <br /> 7112/91 Received report on installation of vapor extraction well. PID �I <br /> readings only from surface to 50' below grade (levels high). Soil <br /> samples collected at 55', 60', 65', 70'. <br /> 8115/91 Vapor extraction initiated from EW1. <br /> 8191-12192 Vapor extraction from EW1 and quarterly reports. <br /> 12/92 Attempted vapor extraction from MW1 for 4 days but low <br /> concentrations were measured. <br /> 1/93-7/93 Vapor extraction from EW1 and quarterly reports <br /> 8120193 RP & P.HS/EHD meeting - pulsing of system requested. <br /> 9/93-12/93 Pulsing of vapor extraction system. Low levels - not cost effective. <br /> 8/10/93 EW1 found to contain water so it will be used as a monitoring well. <br /> Sampled EW1 - only xylene at .98 ppb detected. <br /> 6/13-14/94 Four soil borings drilled. Two converted to monitoring wells MW8 & <br /> MW9 (screened 55'-75'). Confirmation borings CB1 and C62 <br /> within 25' of former tank location where MW2 and EW1 are <br /> located. TPH at 20' in C131 (300 ppm), TPH at 35' in C131 and CB2 <br /> (2200 ppm &450 ppm respectively). No contamination evidenced <br /> below 40'. <br /> 6/94-9/95 Five ground water sampling events - only contaminants detected <br /> were in MW9 (Toluene .52 ppb, Xylene 2.9 ppb). Depth to water <br /> ranged from 64' - 58'. <br /> 5195 Sesoil Modeling data submitted to PHS/EHD. <br />