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CHRONOLOGY <br /> STOCKTON PLATING INC <br /> 632 SOUTH EL DORADO STREET <br /> STOCKTON CA <br /> 12-15-94 PHS/ HD receives call from Stockton Plating Inc. of accidental spill of approximately 200 <br /> gallons of echant material from a storage container. The material contained various <br /> metals and muriatic acid. The material spilled onto the levee road, down the embankment <br /> and ino Morman Slough. Morman Slough did not have any water in it at the time and is <br /> usual) dry. <br /> 12-15-94 <br /> through <br /> 12-16-94 Stockt n Plating Inc. immediately applied absorbent to spill area to stop any additional <br /> discharge to land. To mitigate the spill to land, Stockton Plating Inc. removed soil from <br /> groun surface to approximately three inches below ground surface along the path of the <br /> spill. he soil was removed until all visual and olfactory evidence indicated the bulk of the <br /> impacted soil was removed. <br /> 12-19-94 Three confirmation soil samples were obtained this date, one from the top of the levee <br /> road, one from the sloped embankment, and one from the bottom of Morman Slough. The <br /> samples were obtained approximately three inches below ground surface. The geologist <br /> on Site collecting the samples considered the soil to consist primarily of silts and clays. <br /> In addition, three soil samples were collected from the stockpiled soil to be composite and <br /> analyzed for final disposition. <br /> 01-09-95 PHS/ HD receives analytical results of the soil sampling that took place on 12-19-94. <br /> Cd C Cu N Pb Zn pH <br /> TOP <br /> I I I <br /> OF <1.0 31.0 34.0 28.0 41.0 98.0 7.5 <br /> LEVEE <br /> i <br /> BANK <br /> OF 18.0 35.0 210.0 87.0 100.0 110.0 7.4 <br /> SLOUGH <br /> BOTTOM <br /> OF 1.9 41.0 83.0 95.0 18.0 170.0 7.3 <br /> SLOUGH <br /> i <br /> STOCK- <br /> PILED 18.0 35.0 740.0 310.0 230.0 240.0 7.6 <br /> SOIL <br /> These levels of metals were compared with background levels from the area that were <br /> established from another investigation at a nearby PG&E facility. The only two slightly <br /> higher levels observed were for the sample obtained from the bank and only for copper <br /> and cadmium. Because these levels were slightly higher than the comparable background <br /> levels and because any potential remaining spill material is very limited in extent, <br /> PHS/E D has determined that the spill area will not be added to the local contaminated <br /> database nor referred to any other agency for follow up. <br />