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CHRONOLOGY <br /> SINCLAIR-_ TRUCKING <br /> 3780 LINNE ROAD <br /> TRACY CA 95376 <br /> 03/31/87 One 350-gallon underground storage tank (UST) removed this date under <br /> SJCIEHD permit and inspection. <br /> 04/01/87 Soil sample for analysis was collected from beneath the for UST location. <br /> 05111187 Analytical results from soil sample were submitted.to SJCIEHD. The, <br /> samplewas positive for total petroleum hydrocarbons as gasoline and <br /> diesel, benzene, toluene, xylenes and ethylene dibromide. <br /> .05/05/88 Unauthorized Release Report and Notification of Hazardous Waste <br /> Discharge filed this date. <br /> 03/07/94 Contaminated Site Letter mailed to responsible party. . <br /> 11/28/94 "Notice of Reimbursement" and Site Letter sent to responsible party(ies) <br /> Jay and Verna Sinclair; directive to submit a site investigation work plan to <br /> SJCIEHD not later than 1/15195. . <br /> 04/14/95 Work plan for beginning site investigation submitted this date. <br /> 05/25/95 Letter of Commitment received from SWRCB Cleanup Fund. <br /> 06/14/95 Three groundwater monitoring wells and one soil boring installed this date <br /> see "Preliminary Site Investigation Report" dated 09/28/95 submitted by <br /> Del-Tech Geotechnical Support & Geological.Technics, Inc. (GTI). Soil <br /> contamination noted in samples from MW-1 boring from'6 to 9 feet below <br /> surface grade (bsg) and in'SB-1 at 11.5 feet bsg; water contamination <br /> noted in MWA. <br /> 02/16/99 Groundwater monitoring well.MW-4 installed this date. See GTI report <br /> "Subsurface Investigation" dated July 21, 1999. Soil contamination noted <br /> from 7 to 14 feet bsg in MW-4'boring; groundwater impacted. <br /> 04/12/02 Groundwater monitoring well MWA01 installed this date to investigate the <br /> vertical extent of the groundwater contamination in the source area. See <br /> GTI report"Site Characterization Report" dated June 18, 2002. Soil 7 <br /> contamination noted in the sample collected from 14 feet.bsg.. <br /> Groundwater was reported as non-detect. <br /> 05/14/02 Date of"Report-Receptor Survey".prepared by GTI. Fifteen domestic wells <br /> are reported located within a 2,000400t radius of the site. Eleven well logs <br /> are available, of those eleven wells none are screened shallower than 100 <br /> feet bsg or have less than a 50-foot sanitary seal. The onsite domestic well- <br /> located <br /> located approximately 210 feet NNE of the former tank pit has been <br /> sampled quarterly and has been consistently non-detect. The-report <br />