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Soil borings were completed to ten feet in the three indicated <br /> locations (Figure 5 ) . Borings were made using hand auger <br /> equipment. Boring logs are presented in the appendix. Soil <br /> samples were taken using brass sleeves fitted in a 2 inch diameter, <br /> 6 inch long, core sampler . The core sampler was advanced into <br /> undisturbed soil with a slide hammer. <br /> Soil samples were taken at 2 feet, 7 feet and 10 feet below the <br /> washpad surface. Samples were sealed with foil lined end caps, <br /> chilled and transported to the analytical laboratory under chain of <br /> custody. Chain of custody forms are included in the appendix. <br /> 3. 1 .2 Secondary Clarifier <br /> The upstream (west) separation chamber is most heavily affected <br /> when overloading occurs . As contaminated water overflows chamber <br /> one, less is discharged to chamber 2 and if chamber 2 overflows <br /> even less reaches chamber 3 . Compounding the importance of chamber <br /> one as a contaminant source, the maaority of separated contaminants <br /> are impounded in this chamber. As a consequence, two boring <br /> locations were sited next to chamber one. A third was sited near <br /> the discharge outlet (adjacent to chamber 3 ) to detect any <br /> contamination which may have floated out of the clarifier and <br /> settled at this end of the unit. Figure 5 illustrates the boring <br /> locations. <br /> Soil borings were completed to ten feet at each location_ Borings <br /> were made using hand auger equipment. Boring logs are presented in <br /> the appendix. Soil samples were taken using brass sleeves fitted <br /> in a 2 inch diameter, 6 inch long, core sampler. The core sampler <br /> was advanced into undisturbed soil with a slide hammer. <br /> Soil samples were taken at 2 feet, 5 feet and 10 feet below grade. <br /> Samples were sealed with foil lined end caps, chilled and <br /> transported to the analytical laboratory under chain of custody. <br /> Chain of custody forms are included in the appendix. <br /> 3 . 1 .3 Discharge Pit Area <br /> During high flow conditions runoff contaminant concentrations <br /> reaching this point are highly diluted. During normal flow <br /> conditions the wetted area in the pit is quite small, less than 4 <br /> feet in diameter. Consequently, 2 sample locations were sited, one <br /> adjacent to the outfall and one adjacent to the discharge pipe. <br /> Both are within the radius of wetted area under normal flow <br /> conditions . Proposed sampling locations at the downstream <br /> discharge pit are indicated on Figure 5 . <br /> 12 <br />