Laserfiche WebLink
R <br /> / (Groundwater _ <br /> Flow DnecUOD <br /> ]2 i <br /> ( 0-2 - <br /> 0.1 ° \ <br /> o. <br /> oz z \ \ �.J° z D. •\. 1 <br /> 02+ <br /> s a2 <br /> 30 <br /> \77 °3.5 \ o <br /> lT <br /> }} 0.0 pRC(VFDO%YGEN CDIICENIpAIICN(mgy ? <br /> f' —1.(ti- WIF OL L6Wl 065 m ENC EMM F°Cll T - 1 <br /> PW Dw WINFF D) j <br /> CCNTLHM Wx-VPWpIE I <br /> " Figure 2. DissoNed`oxygen in ground water, PatrckAFB,Flo da: <br /> containing sea shell fragments to a depth m/year. <br /> of about 7.5 meters below ground surface <br /> (bgs) where a confining marl formation was RESULTS <br /> located. The water table was near 1.3 me- <br /> ters bgs, and the downward gradient The extent of the plume was measured by <br /> measured in monitoring point wells was the BTEX dissolved in the ground water as <br /> 0.002 m/m. Slug testing indicated that av- shown in Figure 1. Surface area over the <br /> erage hydraulic conductivity was near plume was about 200 meters long and 60 <br /> 0.026 cm/sec. The average advective meters wide. Free-floating gasoline was not I <br /> ground water velocity was about 48m/year detected in any of the sampled wells. <br /> assuming a sand porosity of 0.35. Using <br /> TOC measurements, a retardation factor of LOSS OF CONTAMINANTS <br /> 2.6 was calculated for benzene. The effec- Point A as shown in Figure 1 was selected <br /> tive solute transport velocity was 18.3 for the highest dissolved BTEX with points k <br /> B and C at 38 and 98 meters, respectively, k <br /> Compound Point B Biodegradation Point C Biodegradation a ISI <br /> Correctedµg/l_ A to B% Correctedµg/L B to C% f <br /> Benzene 2008 0 4 100 :r <br /> Toluene 35 95 9 46 <br /> Ethylbenzene 24 97 9 22 <br /> Fda Xylenes 251 95 67 43 <br /> Total BTEX&TMB 2400 70 103 91 <br /> - -a- ._able:3. Percent loss_usmg methane-corrected levels <br /> 4 Proceedings of the 10th Annual Conference on Hazardous Waste Research f <br />