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iz <br /> r <br /> s <br /> CHRONOLOGY <br /> 501 W. RETTLEMAN, LODI <br /> 12/24/86 Pipeline leak confirmed with an estimate of '500-800 <br /> gallons lost. City of Lodi well 240 feet from site <br /> (well 500, deep with a 108' grout) . <br /> 4/8/87 Three monitoring wells installed. Soil and groundwater <br /> contamination confirmed. <br /> 7/17/87 Monitoring wells 4, 5, and 6 installed and soil borings <br /> Bl and B2 drilled. <br /> 7-11/87 Free product removed from W-2 and W-3 . <br /> 11/87 Monitoring wells 7 and 8 installed. <br /> 5-7/88 Free product removed from W-2 and W-3 . <br /> 6/88 Monitoring wells W-2A and W-2B installed. 7 <br /> 4-5/90 Monitoring wells W-1A, W9, W10, W11, W12 were <br /> installed, monitoring well 1 was destroyed, groundwater <br /> extraction well E-1 was installed, and 8 vapor <br /> extraction wells were installed. <br /> 7/91 Vapor extraction testing began. <br /> 12/91 Final Remediation Plan approved. <br /> 10/92 Groundwater extraction began. <br /> 4/93 Groundwater extraction stopped because concentrations <br /> were nondetectable. <br /> 3/95 Groundwater contaminant concentrations were <br /> nondetectable. <br /> 2/96 Vapor extraction stopped because of continued low <br /> influent concentrations . <br /> 10/96 Closure report submitted. <br /> 1/97 PHS/EHD concurs with closure. <br />