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i <br /> Chronology Page 2 <br /> 103 E Street, Tracy <br /> 03/26/91 Oh this date a 550 gallon gasoline UST (UST E or UST 9) and a 1000 gallon <br /> gasoline UST (UST F or UST 10) were removed under permit and inspection of <br /> EHD. Soil samples were collected beneath the USTs. No further investigation.of <br /> UST F was required. Since soil,Boring BH-1 was drilled near UST E and there <br /> was TPH diesel detected at 10 feet further investigation was required in that <br /> area. <br /> 01/15/92 The date EHD received "Stockton Cleanup Summary 103 N. E Street" report that <br /> contained-soil and ground water data from soil borings and monitoring wells. <br /> 08112=13192 On these dates monitoring wells MW12 and MW13 (screened 55 — 80 feet) and h <br /> soil boring B92-1 were completed. ' <br /> t <br /> 08117192 . On this date the location.of former UST=E was re-excavated and samples <br /> analyzed for TPH-d. Asphalt was found near the surface and the bottom <br /> samples had low TPH-d concentrations. <br /> 10/13/92 A vapor extraction test was conducted on this date using MW 13 and piping <br /> placed in the UST excavation in 1987. <br /> 10/28/92 Date of"Soil Excavation and Characterization" report on 8117192 excavation. <br /> Further investigation.of UST-E was not required. <br /> 12/16/92 Date of the "Problem Assessment Report and Final Remediation Plan" that . <br /> discusses installation of MW 12, MW 13 and B92-1; and the results of the vapor <br /> extraction test conducted on 1.0113192. <br /> 03/11/94 On this date.installation of monitoring well MW 14 (screened 55-80 feet) was <br /> completed. <br /> 04/04/94 The date of the "Remedial Action Plan and Results of Soil Vapor.Extraction Pilot <br /> Test" that discusses the installation of MW14 and the results of a soil vapor <br /> extraction pilot test conducted using MW 14. <br /> f <br /> 5 <br /> 06/03/94 Date a Public notice of proposed remedial action was posted at site and in the <br /> EHD office as required by public participation section in the UST regulations. <br /> 12/22/94 On this date the soil vapor extraction system was in operation and its operation y <br /> continued until 1996. <br /> 12/30/94 On this date the over,drilling of MW13 was completed, the bottom of the borehole <br /> was grouted and another casing was installed with a screened interval of 35 to <br /> 65 feet so it could be used for vapor extraction. f <br /> 05/08/95 Air sparge well AS1 -was installed on this date. <br /> 06/19/95 Air sparging commenced on this date. <br /> 08/21/95 Date of the quarterly report that discusses the installation of AS1. <br />