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COR <br /> 7.3 "D" Zone SPH and Hydrocarbon Concentration Trends <br /> SPH has historically not been reported in the "D" zone wells. Dissolved TPHg, TPHd, benzene, <br /> and MTBE concentrations in the "D" zone were within historical ranges during the first quarter <br /> 2006. Concentration increases and decreases for the analytes TPHg, TPHd, benzene, and <br /> MTBE for the first quarter 2006 relative to the fourth quarter 2005 are presented in the table <br /> below. <br /> Constituent Wells Number of Wells Wells Number of Wells <br /> Concentrations Concentrations Concentrations Concentrations <br /> Increased Increased Decreased Decreased <br /> TPHg TS/MW-1 1 OW-5D, OW-81) 2 <br /> AR/MW-14D, <br /> TPHd TS/MW-1 1 OW-3D, OW-5D, 5 <br /> OW-8D, <br /> TO/WC2D <br /> AR/MW-14D, <br /> Benzene TO/WC-2D l 1 OW-5D, OW-8D, 4 <br /> TS/MW-1D <br /> MTBE TO/WC-2D, 2 No Wells 0 <br /> TS/MW-1 D <br /> • <br /> • <br /> STTC 1406 Final Report 15 May 1,2006 <br /> 770T.43673.12.0002 <br />