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Perform/Interpret Ground Wate0onitoring continue we the current P&T system <br /> Long-term ground water monitoring programs typically increase capacity of the current P&T system <br /> involve quarterly, semi-annual, or annual monitoring of and/or modify extraction well locations <br /> ground water quality and elevations. The data from <br /> this monitoring should be managed electronically to investigate and characterize potential <br /> facilitate analysis, reduce time, and reduce the additional contaminant sources <br /> possibility of entry errors. The data should be used to <br /> monitor the effectiveness of the subsurface remedy and apply an aggressive source removal <br /> update or calibrate site ground water flow and technology <br /> contaminant transport models,if they exist. New data <br /> should be interpreted and compared to historical data switch to another remedial technology or <br /> on a regular basis. Though not always necessary, implement an additional technology <br /> statistical analysis may be helpful in interpreting the <br /> data. Based on trends from these data, site managers consider alternate goals <br /> should periodically consider the following options <br /> (perhaps every 2-3 years as part of a comprehensive focus extraction on specific areas <br /> performance evaluation such as the Five Year Review <br /> for Superfund sites): reduce the extent and frequency of monitoring <br /> as a clear pattern develops <br /> Exhibit 5 <br /> Calculating Contaminant Mass Loading and Removal Rates <br /> Contaminant mass loading and removal rates can be calculated with the same basic equation. However, the units <br /> and conversion factors are different for air than they are for water. <br /> For Water: For Air: <br /> 3.785 L 1440 min. 2.2 lbs. 0.0283 m' 1440 min. 2.2 lbs. <br /> MH,o= QH,o x CH,o x gallon x day x 10' ug M„ = Q,, x C;,x ft' x day x 10° mg <br /> MN_o = mass loading, removal rate in water(lbs/day) M„i, = mass loading, removal rate in air(lbs/day) <br /> QH,o = flow rate in water(gpm) Qi, = flow rate in air(cf rt) <br /> CH,o = contaminant concentration(ug/L, ppb) C.i, = contaminant concentration (mg/M3) <br /> For air calculations, C,i,in mg/m' (with molecular weight,MWx,in grams per mole)can be obtained at 707 and a <br /> pressure of 1 atmosphere from parts per million by volume(ppmv)by the following steps: <br /> Conc(ppmv) I mole air 1000L 1000 mg <br /> C°i,(m$/m') = 106 x 24.1 L x ln3 x g x MWx <br /> Note: The conversion factor (1 mole air)/(24.1 L) varies with both temperature and pressure. At a pressure of 1 <br /> atmosphere and a temperature of 32°F(0°C), the conversion is (1 mole air)/(22.4 L). <br /> Approximate Molecular Weights (MW) in grams/mole of Common Volatile Organic Compounds (VOCs) <br /> Benzene: 78 DCE: 97 TCE: 131 <br /> Carbon tetrachloride: 154 Ethylbenzene: 106 Toluene: 92 <br /> Chlorobenzene: 113 PCE: 166 Vinyl chloride: 62.5 <br /> DCA: 99 TCA: 133 Xylene: 106 <br /> 8 <br />