Laserfiche WebLink
SECOR <br /> • General Laboratory Notes: For sample AR/MW-11 B, hydrocarbons reported as TPHd <br /> did not exhibit a typical diesel chromatographic pattern. <br /> 5.3 "B" Zone SPH and Hydrocarbon Concentration Trends <br /> SPH has historically not been reported in the "B" zone wells. Dissolved TPHg, TPHd, benzene, <br /> and MTBE concentrations in the "B" zone were within historical ranges during the first quarter <br /> 2006 with the exception of the following: <br /> • In the first quarter 2006, samples from the following wells contained historically high <br /> concentrations at the indicated levels: <br /> o Well AR/MW-1B contained MTBE at a concentration of 170 pg/L (historically <br /> ranged from <20 pg/L to 90 pg/L). <br /> o Well AR/MW-11B contained MTBE at a concentration of 270 pg/L (historically <br /> ranged from 0.67 pg/L to 240 pg/L). <br /> o Well AR/MW-14B containedlMTBE at a concentration of 1,100 pg/L (historically <br /> ranged from 5.1 pg/L to 72 pg/L) and TPHd at a concentration of 1,300 pg/L <br /> (historically ranged from <50 to 1,100). <br /> o Well PS/MW-20 contained MTBE at a concentration of 24 pg/L (historically <br /> ranged from <0.5 pg/L to 4.8.pg/L) <br /> • As reported for the "A" zone wells, dissolved hydrocarbon concentrations in the "B" zone tend to <br /> increase during times of higher groundwater elevations and decrease during times of lower <br /> groundwater elevations. Concentration increases and decreases for the analytes TPHg, TPHd, <br /> benzene, and MTBE for first quarter 2006 relative to the fourth quarter 2005 are presented in <br /> the table below. <br /> Constituent Wells Concentrations Increased Nurnber of Wells Concentrations Decreased Number of <br /> Wells Wells <br /> Concert- Concen- <br /> trations trations <br /> Increased Decreased <br /> AR/MW-1 B, AR/MW-96, AR/MW-18B <br /> TPH AR/MW-116, AR/MW-14B, 7 1 <br /> 9 PSANC-1M, TO/WC-2B, <br /> TS/MW-1 B <br /> AR/MW-1 B, AR/MW-6B, AR/MW-9B, AR/MW-18B, <br /> TPHd AR/MW-11 B, AR/MW-14B, 8 TO/WC-1M 3 <br /> PS/WC-1M, SP/WC-1M, <br /> TO/WC-2B, TS/MW-1 B <br /> AR/MW-1 B, AR/MW-9B, AR/MW-11B, AR/MW-18B <br /> AR/MW-12B, AR/MW-14B, <br /> Benzene AR/MW-18B, PS/WCAM, 8 2 <br /> TO/WC-2B, TS/MW-1 B <br /> AR/MW-1 B, AR/MW-6B, OW-413, TS/MW-1 B <br /> AR/MW-11 B, AR/MW-14B, <br /> MTBE AR/MW-21 B, PS/MW-20, 9 2 <br /> PS/WC-1 M, TO/WC-1 M, <br /> • TO/WC-2B <br /> STTC 1Q06 Final Report 10 May 1,2006 <br /> 770T.43673.12.0002 <br />