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3425 Tracy Blvd. Chronology <br /> Page 2 <br /> 07/21/93 One 6000 gallon and three 8000 gallon gasoline UST's were removed. <br /> Sol] and grab groundwater samples were collected. <br /> 07/23/93 Soil excavated (1,000 cubic yards) after USTs were removed. Four new <br /> UST's were placed in the excavation. <br /> 10/14/93 The date of the UST Removal Report. <br /> 02/17/94 Measurable free product found in ATR8 that is off site and down-gradient <br /> of the USTs. <br /> 9/16-26/94 Three air sparge wells (SI-S3), seven dual completed air sparge/vapor <br /> extraction (VES1 —VES 7) and a dual completed monitoring/air sparge t <br /> well (SMI) were installed. <br /> 02/27/95 Date of"Soil Vapor Extraction and Air Sparge Well Installation" report. <br /> i <br /> 04/03/95 Date of"Final Remediation Plan" that was provided for public review and <br /> comment until May 5, 1995. 4 <br /> 12/31/95 The date soil vapor extraction (SVE)remediation began operation. <br /> 06/01/97 The date air sparging in conjuction with SVE was initiated. <br /> 06/01 SVE system was shut down because of low influent concentrations <br /> i <br /> 01/26/04 Groundwater extraction well TEX1 destroyed. <br /> 05104 Air sparge system was shut down. <br /> 02/24/05 The date of the URS Site Closure Report requesting No Further Action <br /> Required determintation . To date, 3,617 pounds of TPHg and 10.6 <br /> pounds of benzene has been removed using SVE and less than one pound <br /> of petroleum hydrocarbon remains untreated beneath the site. <br /> 04/13/05 EHD staff discussed with CVRWQCB on this date the URS request of site <br /> closure. <br /> k <br /> i <br /> . I <br />