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SECCR <br /> 7.0 "D" ZONE <br /> 7.1 "D" Zone Groundwater Gradient <br /> Groundwater elevations in the "D" zone wells ranged from 4.91 feet below MSL in well 0W-8D <br /> to 0.97 feet below MSL in well TO/WC-2D. Regional groundwater flow in the "D" zone during <br /> the first quarter 2006 was to the east-southeast at an approximate hydraulic gradient of 0.003 <br /> ft/ft (Table 3). A groundwater elevation contour map for the "D" zone on February 6, 2006 is <br /> presented as Figure 17. <br /> 7.2 "D" Zone Groundwater Quality Data <br /> During the first quarter 2006, groundwater samples were collected from seven "D" zone wells <br /> between February 6 and February 9, 2006 (Table 1). "D" zone TPHg, TPHd, benzene, and <br /> MTBE isoconcentration maps are attached as Figures 18, 19, 20, and 21, respectively. <br /> Analytical results are presented in Tables 4I and 5, and are summarized below. <br /> • SPH: During this quarter, SPH wasilnot reported in any of the seven "D" zone wells. <br /> • Analytic I Results Summa : <br /> • <br /> Number of Number of Minimum Maximum <br /> Detections <br /> Wells Concentration in Concentration in <br /> Constituents Analyzed ab ve he Ng/L (Well ID) pg/L (Well ID) <br /> TPHg 7 3 70 (TS/MW-5D) 9,200 (TS/MW-2D) <br /> TPHd 7 5 66 (TO/WC-2D) 1,800 (TS/MW-2D) <br /> Benzene 7 6 0.74 (OW-5D) 3,000 (TS/MW-2D) <br /> Toluene 7 1 --- 22 (TS/MW-2D) <br /> Ethylbenzene 7 1 --- 67 (TS/MW-2D) <br /> Xylenes 7 1 --- 95 (TS/MW-2D) <br /> MTBE 7 3 1.2 (TO/WC-2D) 19 (TS/MW-2D) <br /> TBA 3 3 7.6 (OW-5D) 920 (TS/MW-2D) <br /> DIPE — - — <br /> TAME — --- --- --- <br /> ETBE --- — --- --- <br /> Ethanol --- --- --- --- <br /> Methanol --- --- <br /> Definitions: <br /> MRL = Method Reporting Limit <br /> pg/L = Micrograms per Liter <br /> = <br /> Not applicable <br /> • <br /> STTC IQ06 Final Report 14 May 1,2006 <br /> 770T.43673.12.0002 <br />