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' • • As of 4/04/88 <br /> ' STOCKTON TERMINAL INVESTIGATION CHRONOLOGY <br /> 02/25/88 (Thursday afternoon) Time Oil personnel at Stockton terminal <br /> ' observed a "wet spot" on the ground where the underground line <br /> from Southern Pacific Pipe Line (SPPL) joins Time Oil 's <br /> header. A hole was dug and gasoline was found at a depth of <br /> ' approximately two feet. Terminal was closed, with last <br /> shipment out at 5:35 p.m. <br /> 02/26 & 27/88 (Friday and Saturday) Time Oil personnel assisted SPPL in <br /> excavation of SPPL pipeline. All six underground product <br /> lines to the Time Oil truck loading rack were tested with air <br /> pressure. <br /> ' 02/28/88 (Sunday) Time Oil began excavating to define extent of <br /> contamination. Thirteen test pits (T1 — T13) were dug to a <br /> ' depth of 6' to 8' with a backhoe. Notes were kept on soil <br /> profile and depth at which product first appeared. <br /> 02/29/88 (Monday) Product and water levels in the test pits were <br /> ' measured from temporary reference points, the elevations of <br /> which were later surveyed. An additional test pit (1­14) was <br /> excavated. A trench was excavated to a depth of 6' connecting <br /> ' pits T3, T4 and Tll . The trench was filled with gravel to <br /> within 3' of the surface. Casings were installed in the <br /> general location of pits T3, T4 and Tll to a depth of 101 . <br /> ' The trench was pumped by a vacuum truck during excavation. <br /> Storage tank number 33007 (Unleaded Regular) was tested using <br /> acoustic emission technology. <br /> ' 03/01/88 (Tuesday) Product and water levels were measured in pits that <br /> had not yet been cased. The trench was extended to pits T1 <br /> and T12. Casings were installed in pits T1 , T2, T5, T8, T12 <br /> ' and T14. The remaining test pits were backfilled. <br /> 03/02-04/88 (Wednesday — Friday) Product thickness was measured in wells <br /> ' T1 , T3, T4, Tll and T12 each morning, the wells were then <br /> pumped with a vacuum truck and product thickness was measured <br /> again each afternoon. Storage tanks 10002 (Leaded Regular) , <br /> 10003 (Unleaded Premium) , 16004 (Unleaded Premium) and 30006 <br /> ' (Leaded Regular) were tested using acoustic emission <br /> technology. <br /> ' 03/08 to present <br /> Daily product and water level measurements are being made in <br /> wells T1 T2 T3 T4 TS TB Tll T12 T14 SP1 SP2 SP3 <br /> ' SP4 and SP5. (The "SP" wells were installed by SPPL, along <br /> the pipeline right—of—way) . Periodic measurements are also <br /> being made in wells R1 , R2, R3, R4, R5 and R6 which were <br /> previously installed in the Time Oil tank farm. Samples of <br /> ' product from wells T1 , T3, T4, Tll , T12, SP2 and SP3 are being <br /> collected, tested for API gravity and retained. <br /> ' 03/29/88 Three additional test pits (T15, T16, T17) were dug with a <br /> post—hole digger inside Time Oil tank farm. <br /> 1 <br />