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Report—Remedial Action Feasibility Page 16 <br /> Cutter Lumber—Western Lift Site <br />' GPE Project No 102 3 <br /> • August 1,2003 <br />' It is also worthy of note that upon starting the sparge system, the groundwater level rose <br /> almost instantaneously in several nearby monitoring wells One well (MW-6) about 13 <br /> feet from the sparge well (ASW-1) experienced elevated water levels of 2 to 3 feet <br />' When sparging was halted the level quickly fell back to normal See the data in Summary <br /> Table 3 for details <br />' 6.1.3 System Performance Calculations <br /> Using the gasoline concentration in mg/L as calculated by methods described above, the <br /> gasoline vapor load was multiplied by the average vapor extraction rate for each <br />' incremental time period (not less than daily) Typically, the vapor extraction rate was <br /> estimated to be about 115 scfm, which works out to a total of over 145,000 for the full <br /> test period In addition to calculating the daily hydrocarbon extraction rate, a running <br />' cumulative was calculated for total gasoline mass extracted By using this method, we <br /> estimated that about 210 pounds of gasoline were removed over the course of the pilot <br />' operation The graph below (Cross-Plot 3) shows the extraction rates calculated on a per- <br /> day basis, while the upper curve is the cumulative running total of extracted gasoline <br />' Vapor Extraction Performance <br /> 1000 <br /> Switch to MW-7 <br /> 100 <br /> V <br /> as <br /> -+-Extract Rate <br /> 1 <br /> LU10 - (l /day) <br /> xtracted <br /> 0 <br /> C <br />' o <br /> 1 Begin Sparge <br />' 0 <br /> 0 20 40 60 80 100 120 <br /> Hours <br /> The mayor inflection points on the graph mark the start of air sparging which resulted in a <br />' dramatic and immediate increase in the mass loading of the extracted vapor, and the point <br /> where the vapor extraction well was switched from VEW-I to MW-7 <br /> 2937 Veneman Ave, #13240 Geo-Phase Environmental Inc Phone(209) 569-0293 <br /> Modesto, CA 95356 Fax(209) 569-0295 <br />