Laserfiche WebLink
UST and Product Line Replacement-Tosco 76 Branded Facility No.11193,Stockton,CA <br /> April 12,1999 <br /> bgs. Per the direction of Ms. Lagorio, four additional soil samples, labeled D1-2-10.5 through D4-2- <br /> 10.5, were collected from the base of over-excavated areas at approximate depths of 10.5 feet bgs. <br /> Native soil consisted primarily of sand and silty sand. Moisture was observed in soil sample D3-2- <br /> 10.5. <br /> The four soil samples were analyzed for TPHg, BTEX and MtBE. TPHg was not detected in three of <br /> four soil samples, and was detected in sample D3-2-10.5 at a concentration of 29,600 ppm. MtBE <br /> (EPA 8020) was not detected in sample D3-2-10.5, and was detected in the other soil samples at <br /> concentrations ranging between 0.172 and 5.09 ppm. <br /> Stockpile Sampling <br /> On December 11, 1998, five composite soil samples (CompA through CompE) were collected for <br /> disposal characterization from approximately 500 cubic yards of stockpiled soil generated from the <br /> gasoline UST excavation. On December 22, 1998, one composite soil sample (Comp-PT) was <br /> collected from approximately 90 cubic yards of stockpiled soil generated from the piping trenches. On <br /> December 29, 1998, one additional composite soil sample (SSPT1-A,B,C,D) was collected from <br /> approximately 100 cubic yards of stockpiled soil generated from the product piping trenches during <br /> over-excavation activities. <br /> All composite soil samples were analyzed for TPHg, BTEX, MtBE, and total lead. The analytical <br /> results of the composite soil samples were within limits acceptable to the landfill. Analytical results are <br /> summarized in Table 1. <br /> SOIL DISPOSAL <br /> On December 16, 1998, and January 4, 1999, Manley & Sons Trucking, Inc. of Sacramento, <br /> California, removed soil stockpiles (represented by samples CompA through CompE, Comp-PT, and <br /> SSPTI-A,B,C,D) from the site and transported a total of 1073.52 tons of soil to the Forward, Inc. <br /> disposal facility in Manteca, California. Copies of soil disposal documentation are attached. <br /> WATER DISPOSAL <br /> On December 7, 1998, one composite groundwater sample was collected from two groundwater <br /> monitoring wells (MW-1 and MW-2) adjacent to the gasoline UST pit. The water sample was <br /> collected to characterize water to be pumped from the UST pit to depress the water table during the <br /> installation of new USTs. The sample was analyzed to satisfy acceptance requirements for water <br /> treatment at the Tosco Refinery in Rodeo, California. The sample was analyzed for static hazardous <br /> abbreviated screen bioassay (fish bioassay), Organochlorine Pesticides and PCBs (OP&PCBs), <br /> Volatile Organic Compounds (VOCs), reactivity, corrosivity, ignitability (RCI), total sulfides, total <br /> 140205.02 <br /> 4 <br />