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r — - <br /> ti � <br /> Mr Kenneth Earnest <br /> November 4, 1994 <br /> Page 2 <br /> July 20 to August 31, 1994 <br /> The vapor extraction system ran continuously during the reporting period except for an 8-day <br /> shutdown to do a rebound test. Over the 34-day operating period, the vapor extraction system <br /> extracted an estimated 228 pounds of hydrocarbons (based on field readings) The laboratory <br /> results for influent air samples collected on August 4 and 12, 1994, indicated the benzene <br /> concentration was below detection levels The resulting estimated benzene extracted is 0 0 <br /> pound Therefore, as of August 31, 1994, the cumulative totals for extraction amounts since <br /> start-up of the system were 12,321 pounds of hydrocarbons and 211 pounds of benzene <br /> For this reporting period, the ground water extraction system pumped continuously and extracted <br /> 14,433 gallons from monitoring well MW-3 As of August 31, 1994, the cumulative ground <br /> water extraction total was 105,615 gallons <br /> August 31 to September 22, 1994 <br /> The system ran continuously during the reporting period except for a 7-day shutdown to do a <br /> rebound test. The estimated hydrocarbon extraction during this period is 153 pounds (based on <br /> field readings) The laboratory results for two influent air samples collected on September 15 <br /> and 22, 1994, indicated that both were below the detection limits for benzene The resulting <br /> estimated amount of benzene extracted is 0 0 pound Therefore, as of September 22, 1994, the <br /> cumulative totals of hydrocarbons and benzene extracted since start-up of the vapor extraction <br /> system are 12,474 and 211 pounds, respectively <br /> For this reporting period, the ground water extraction system extracted 2,415 gallons from <br /> monitoring well MW-3, bringing the cumulative ground water extraction total to 108,030 <br /> gallons The extraction volume was lower than normal during this period because of an <br /> unexplained shutdown <br /> Enclosure A contains copies of laboratory analytical reports Enclosure B contains copies of <br /> field log sheets <br /> AC I ON - <br /> MICKLLSON • lrptisi mj <br /> van DAM,INC <br /> Consulting Scientists,Engineers,and Geologists <br />