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k9 KLEINEELDER <br /> 6.3. WASTEWATER TREATMENT PLANT SOIL SAMPLING AND ANALYSES <br /> A total of 21 soil samples will be collected from 9 soil borings advanced in the <br /> Treatment Area (see Plate 4). Two or three soil samples will be collected at each <br /> boring location at depths ranging from of 0 to 12 inches (At interface between <br /> concrete/aggregate base and soil) to 112 inches bgs. Sampling depths for locations <br /> adjacent to vault/subsurface containment areas are proposed at deeper sampling <br /> depths as opposed to surface process equipment/tanks. For specific sampling depth <br /> intervals of each sample location please refer to the following Table 8 (Page 22) and <br /> Plate 4. Three boring locations (TP-4, TP-5 and TP-6) are proposed near two relatively <br /> large holding tanks (Tank 6 and 7). One boring each is proposed near a metal <br /> processing tank, filter press and batch tanks (Borings TP-1, TP-9 and TP-2, <br /> respectively). One soil sample each at depths of 66 to 72 inches bgs from borings TP- <br /> 1, TP-4, TP-5 TP-6 and one soil sample (0 to 12 inches bgs) from borings TP-2 and TP- <br /> 3 will be submitted for the following analyses: <br /> • Copper, Nickel, Aluminum and Chrome III by EPA Method 6010 <br /> • Cn by EPA Method 9010 <br /> • PH by EPA Method 9045 <br /> • Cr+6 by EPA Method 7199 <br /> Subsurface soil samples at depths of 42 to 48 and or 108 to 112 inches will be put on <br /> hold pending the shallow soil sampling results (See Table 8). <br /> Two soil samples will be collected at boring location TP-7 advanced near a Cr+6 <br /> Process tank vault. The shallow sample collected at depths of 66 to 72 bgs will be <br /> analyzed for the following: <br /> • Chrome III by EPA Method 6010 <br /> • Cr+6 by EPA Method 7199 <br /> The deeper soil sample collected at depths of 108 to 112 inches bgs will be put on hold <br /> pending the shallow soil sampling results. <br /> Three soil samples will be collected at boring location TP-8 advanced near a surface <br /> sulfuric acid tank. The shallowest soil samples collected at depths of 0 to 12 inches <br /> bgs will be analyzed for the following: <br /> PH by EPA Method 9045 <br /> Two subsurface soil samples at depths of 42 to 48 and 108 to 112 inches will be put on <br /> hold pending the shallow soil sampling results <br /> 57252.T02/ST05R999/DH:ly Page 16 of 29 <br /> ©2005 Kleinfelder, Inc. September 1,2005 <br />