Laserfiche WebLink
SECOR <br /> 6.0 "C" ZONE <br /> 6.1 "C" Zone Groundwater Gradient <br /> Groundwater elevations in the "C" zone wells ranged from 3.35 feet below MSL in well OW-9C <br /> to 0.25 feet above MSL in well AR/MW-18C. Groundwater flow in the "C" zone during the first <br /> quarter 2006 was generally to the southeast at an approximate hydraulic gradient of 0.001 ft/ft <br /> (Table 3). A groundwater elevation contour map for the "C" zone on February 6, 2006 is <br /> presented as Figure 12. <br /> 6.2 "C" Zone Groundwater Quality Data <br /> During this quarter, groundwater samples were collected from twelve "C" zone wells between <br /> February 6 and February 9, 2006 (Table 1). Analytical results are presented in Tables 4 and 5 <br /> and are summarized below. "C" zone isoconcentration maps for TPHg, TPHd, benzene, and <br /> MTBE are attached as Figures 13, 14, 15, and 16. <br /> • SPH: During this quarter, SPH was not reported in any of the "C" zone wells. <br /> • Analytical Results Summary: <br /> Number of <br /> • Number of Minimum Maximum <br /> Detections <br /> Constituents Wells above the . Concentration in Concentration in pglL <br /> Analyzed MRL Ng/L (Well ID) (Well ID) <br /> TPHg 12 3 300 (OW-9C) 3,900 (AR/MW-11 C) <br /> TPHd 12 10 56 (OW-4C) 1,700 (AR/MW-11 C) <br /> Benzene 1 12 8 1.5 (AR/MW-21 C) 1,600 (AR/MW-11 C) <br /> Toluene 12 4 0.86 (AR/MW-14C) 22 (AR/MW-11 C) <br /> Ethylbenzene 12 2 2.4 (AR/MW-12C) 3.7 (AR/MW-14C) <br /> Xylenes 12 3 3.4 (AR/MW-14C) 23 (AR/MW-11 C) <br /> MTBE 12 4 0.76 (AR/MW-12C) 21 (AR/MW-11 C) <br /> TBA 5 2 20 (AR/MW-12C) 1,200 (MW-11 C) <br /> DIPE 4 0 not detected above MRL not detected above MRL <br /> TAME 4 0 not detected above MRL not detected above MRL <br /> ETBE 4 0 not detected above MRL not detected above MRL <br /> Ethanol 4 0 not detected above MRL not detected above MRL <br /> Methanol 4 0 not detected above MRL not detected above MRL <br /> Definitions: <br /> MRL = Method Reporting Limit <br /> pg/L = Micrograms per Liter <br /> = <br /> Not applicable <br /> • General Laboratory Notes: For samples AR/MW-11C and AR/MW-21C hydrocarbons <br /> • reported as TPHd did not exhibit a typical diesel chromatographic pattern. There were <br /> discrete peaks which may or may not be petroleum relations. The method reporting limit <br /> STTC 1Q06 Final Report 11 May 1,2006 <br /> 770T.43673.12.0002 <br />