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CHRONOLOGY <br /> SWIFT TRANSPORTATION <br /> 781 SWIFT WAY <br /> STOCKTON <br /> SITE CODE: 1075 <br /> i <br /> 1991 <br /> 01114/91 Two underground storage tanks removed this date. i <br /> 1-10,000 gallon diesel and 1-7,500 gallon diesel. <br /> 7,500 gallon tank contained unleaded gasoline at one time. <br /> Cross contamination noted. <br /> i <br /> 02/12/91 Prop 65 and UAR completed. Site brought into CAP Program. <br /> 03/11/91 Six soil borings completed. <br /> 07/01/91 Over-excavation occurred. Excavation reached a maximum depth <br /> thru of 36 feet below surface grade. <br /> 07/23/91 <br /> I <br /> 07/08/91 Back-fill with pea gravel up to 10 feet below surface, overlain with <br /> compacted clean imported fill, aggregate base rock and asphalt. <br /> 07191 All excavated soil transported to landfill - (227.truckloads -4,400 <br /> tons). Transportation manifests on file. <br /> 09/18/91 MW-1 constructed. A ten foot screened interval 36-46' bgs set. <br /> DTW at time of development = 36' bgs. <br /> 1992 <br /> 05/04/92 Received and reviewed groundwater investigation report. Mike <br /> Collins, LOP, changes to LOP Groundwater site, PE=29.26 in <br /> database due groundwater TPH-G and BTEX hits in MW-1. <br /> 10/12/92 MW-2 and MW-3 installed with 20' of screen, 30-50' bgs. Gradient <br /> recorded to the west/southwest- <br /> 1993 <br /> 08/13/93 Kurt Baiasek, Wallace and Kuhl, reports that MW-1 very likely <br /> receiving surface runoff since first time Motor Oil detected. <br />