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SITE CHRONOLOGY <br /> CHEVRON SS# 9-8264 <br /> 3775 N.TRACY BLVD. <br /> LOP SITE CODE: 1418 <br /> CVRWQCB CASE # 390795 <br /> APN: 21217028 <br /> 11/07/1995 Chevron permanently closed and removed along with the associated <br /> piping 4 underground storage tanks (USTs) on this date. Three of the <br /> USTs were used to store gasoline: two were 10000-gal. each and one <br /> was 6000-gal. One 1500-gal. UST was used to store waste oil. <br /> 11/14/1995 The EHD completed and filed an Unauthorized Release Report for the <br /> contamination witnessed during UST removal; laboratory soil results were <br /> positive of petroleum hydrocarbons quantified as gasoline, BTEX, and <br /> fuel additives. <br /> 02/06/1996 Four soil borings were advanced on-site to 13.5 feet below surface grade <br /> (bsg) by Touchstone Development (Touchstone) and soil and ground <br /> water samples were collected for analysis. Four monitoring wells (MW) <br /> were also installed. Soil samples were logged during drilling and soil <br /> samples were also collected for analysis. The MWs were completed to <br /> approximately 25 feet bsg. The results and findings from this soil and <br /> ground water investigation can be found in Touchstone's Corrective <br /> Action Report, dated April 22, 1996. <br /> 03/29/1996 Three new double-walled USTs were installed near the former USTs on- <br /> site and put into service on this date. <br /> 03/19/2002 A well survey within a '/2- mile radius of the site was completed by Secor <br /> International Inc. (Secor) and the findings can be found in Well Search <br /> Report, dated March 19, 2002, <br /> 05/06/2002 Secor performed a Cone Penetration Testing (CPT) investigation on-site <br /> and off-site. Four CTPs were advanced to 35 feet bsg. Details of that <br /> investigation can be found in Secor's Site Assessment Report, dated <br /> January 17, 2003. <br /> 04/23/2007 Conestoga-Rovers & Associates (CRA) prepared an Oxygen Injection <br /> Work Plan. The injection was to increase oxygen levels in ground water <br /> and the biodegradation rate of gasoline contaminants in ground water in <br /> the area of MW4. Oxygen injection was to aid in the bioremediation of <br /> contaminant mass and accelerate ground water clean up. <br /> 02/27/2008 Oxygen injection into the ground water began on this date. <br /> 10/22/2008 The date of the completion of the oxygen injection into ground water. <br /> Oxygen injection occurred every 2 weeks since start up on 0212712008. <br />