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i <br /> j <br /> I <br /> PGand E � <br /> TRACY SERVICE CENTER <br /> 502 E GRANTLINE <br /> TRACY CA <br /> CHRONOLOGY <br /> SITE CODE: 1407 <br /> PROGRAM ELEMENT: 3526 <br /> 11/14/86 2 Borings advanced near tank to collect data for a pre tank removal <br /> assessment. Analytical results of B-1 water sample B 31000, T 49,004 E <br /> 21,000, X 22,000 ppb. Analytical results of B-2 water B 3800, T 23000, <br /> E 6100, X 12000. <br /> Soil results of B-2 are ND, and B-1 has TPH-g 43 ppm, and Benzene <br /> 4.8 ppm, at 9.5 feet <br /> 10/22/87 1500 gallon gasoline tank removed today. No samples from tank <br /> excavation due to pre tank removal assessment data. Tank tracking <br /> record and rinsate manifest never submitted. Soil stockpile reportedly <br /> disposed off site, tank excavation reportedly backfilled with clean fill <br /> (1996 Jonas & Associates report) <br /> 12/22/87 OW-1 installed TD 26 feet. Lab analysis is ND <br /> OW-4 installed TD 24 feet. Lab analytical ND <br /> 01/04/88 <br /> OW-2 installed TD 27 feet. Lab analytical of 8 foot sample was 16 ppm <br /> Benzene. OW-3 installed TD 27 feet no soil contamination encountered.. <br /> 01121/88. Initial sampling of monitoring wells. All wells ND except OW-2 TPH-g <br /> and BTEX = 9500, 850, 59, 640, 3000 ppb. <br /> 11/23/88 Sampling of monitoring wells. All wells ND except OW-2 <br /> TPH-g and BTEX = 900,.294, 104, 34, 172 ppb. <br /> 02/18/88 OW-5 Installed TD 25 feet. Lab analytical ND <br /> OW-6 Installed TD 25 feet. Lab analytical ND <br /> . i <br /> 06/01/88 Remedial investigation completed. Monitoring wells were installed using ' <br /> data from a soil vapor survey. <br /> 09/19/89 Prop 65 89-193 filed. l <br /> 01/03/91 Monitoring wells sampled and'analyzed by PG & E annually until site is <br /> placed in LOP program. <br />