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CHRONOLOGY <br /> STOCKTON UNIFIED SCHOOL DISTRICT(SUSD)CORPORATE YARD <br /> 1932 EL PINAL DRIVE, STOCKTON, CALIFORNIA <br /> i <br /> 06/17/87 Removed one Underground Storage Tank(UST) at the above referenced site: <br /> • UST#3 State ID 58690003, Solvent 500 gallon tank <br /> 07/10/87 San Joaquin County Public Health Services Environmental Health Division(PHS/EHD) <br /> received analytical results of soil samples beneath UST#3 and the results were non- <br /> detect. - !p <br /> 02/05/88 12,000 gallon regular gasoline UST#1 failed to pass precision test. ' <br /> 03/27/90 UST#1 failed second precision test. <br /> 04/03/90 Filed Unauthorized Release Report(UAR)and Prop-65. <br /> 01/15/91 Removed the following USTs and UST fill lines at the site: <br /> • UST#4 State ID 58690004,Diesel 500 gallon <br /> • UST#8 State ID 58690009,Waste Oil 500 gallon <br /> • UST#9 State ID(unknown), Solvent 500 gallon <br /> • 80 feet of Piping from Remote Fill to UST#5,6,7(Removed 01/16/91;UST#5,6, 7 <br /> were not removed.) Soil samples were collected for laboratory analyses. <br /> 04/02/91 Filed UAR and Prop-65s. Analytical results of petroleum hydrocarbons in the soil <br /> samples were as follows: <br /> Center of UST#9 0.10 parts per million(ppm)Xylenes <br /> Piping of UST#9&#4 53 ppm Total Extracted Petroleum Hydrocarbon(TEPH) <br /> Remote Fill Sample#1 17 ppm TEPH, 0.70 ppb Toluene,0.760 ppm Ethylbenzene, <br /> 2.700 ppm Xylenes 2, <br /> Remote Fill Sample#3 1400 ppm TEPH <br /> Remote Fill Sample#4 5200 ppm TEPH <br /> 07/17/95 Entered site into Local Oversight Program(LOP). <br /> 07/16/96 Sent.official"Notice of Responsibility"letter to SUSD directing investigation and <br /> remediation of the contamination <br /> 12/23/96 Removed following underground storage tanks(UST)at the site: ` <br /> • UST#5 State ID 58690006,Diesel 10,000 gallon <br /> • UST#6 State ID 58690007, Diesel 10,000 gallon <br /> Soil samples.from beneath the USTs were collected for laboratory analyses and the <br /> results were non-detect. <br /> 01/03/97 Removed following underground storage tanks(UST)at the site: <br /> • UST#1 State ID 58690001, Regular 12,000 gallon <br /> • UST#2 State ID 58690002,Unleaded 8,000 gallon <br /> • UST#7 State ID 58690008,Diesel 12,000 gallon <br /> Soil samples from the excavations and 300 feet piping run between the Remote Fill and <br /> former UST#5,6,and UST#7 were collected for laboratory analyses. <br /> ) <br />