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CHRONOLOGY <br /> 7474 ELEVENTH STREET, TRACY <br /> 06/02/88 A 550 gallon UST that had contained both regular and diesel gas and a <br /> 1000 gallon UST that had contained regular gas were removed. The <br /> 1000 gallon UST had 2 holes in it. There was odor and discoloration to <br /> the soil in the UST excavation. A grab water sample and two soil <br /> samples from 9 feet below grade were collected (one sample from below <br /> each UST). All sample results evidenced gasoline contamination. A URF <br /> was completed. <br /> 06/24/88 Notification of Hazardous Waste Discharge completed. <br /> 08/19/88 Site was placed on PHS/EHD contaminated site data base. <br /> 03/07/94 Letter to responsible party that further investigation is required. <br /> 03/15/95 Notice of Responsibility sent to responsible party with directive to submit <br /> work plan by May 15, 1995. <br /> 07/25/95 Three monitoring wells installed, all screened from 5 to 20 feet below <br /> ground surface. <br /> 11/13/95 Report of monitoring well installation and groundwater monitoring. Soil <br /> samples only from 6.5 feet in each well. Results were non detect. PID <br /> readings indicate soil contamination at 9 feet below grade. Low levels of <br /> groundwater contamination evidenced. <br /> 06/04/96 PHS/EHD directive to further investigate the site. <br /> 01/13/97 Quarterly report - monitoring wells have been sampled three times. <br /> Drinking water well (located 40 feet from the former UST location) at site <br /> was sampled 12/6/96 and the analytical results were non detect. <br /> 04/25/97 Quarterly monitoring report of samples collected 3/28/97. <br /> 10/16/97 Monitoring well MW 101 installed with screen interval from 26 to 28.5 feet <br /> below grade. Total depth of well was 40 feet. <br /> 10/17/97 Monitoring wells 4,5,6,7 installed, all screened from 5 to 20 feet below <br /> grade. No evidence of contamination. <br /> 12/22/97 Report of Soil and Groundwater Investigation shows greatest soil <br /> contamination from 5 to 15 feet below grade. All monitoring wells and the <br /> drinking water well were sampled. No impact to the drinking water well. <br /> Low levels of contamination in MW3 and MW101. <br />