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i Quarterly Monitoring Report April 2001 Canepa's Car Wash(Pac.itic Avenue) TABLE 2 1 LABORATORY ANALYTICAL RESULTS (APRIL 11, 2001) ' B T E X MTBE TPH-G Repoi ting limits 03 01 03 06 1 0 005 Monitoi Well I D p L nig/L l_rg/L �tg/L }L-/L mg/L 1707-MW1-4/11/01 340 130 34 110 170 17 1707-MW2-4/11101 31,000 1,700 2,200 6,300 ND(200) 100 ' 1707-MW3-4/11/01 ND ND ND ND 83 ND 1707-MW4-4111/01 ND ND ND ND ND ND ' 1707-MW5-411 1/01 01 ND ND ND ND ND 1707-MW6-4/11/01 ND ND ND ND ND ND ' 1707-MW7-4/1 1/01 26 ND ND 0 8 ND ND 1707-MW8-4111/01 ND ND ND ND ND ND Unit Conversions Analytical pg/L parts per billion(ppb) B T E,X=benzene toluene ethyl benzene,and total xylenes mg/L parts per million(ppm) TPH-G=total petroleum hydrocarbons quantified as gasoline MTBE=Methyl tertiary Butyl Ether ND=not detected at or above the laboratory reporting limit 4 3 SOIL VAPOR EXTRACTION SYSTEM Operation of the SVE system was Initiated on March 15, 1999 Condor monitors the system on a monthly basis Volatile organic vapor screening is performed with a photo-ionization detector (PID) at the system inlet and exhaust to evaluate the destfuction efficiency of the thermal oxidation unit Vacuum measurements in inches of water are recorded from ports installed at the SVE wells to evalitate the radius of influence Various other system parameters aie monitored to maintain optimum performance of the ' SVE system (see SVE System Log, Appendix D) The hydiocarbon destruction efficiency for the year 2000 ranged from 96 66% to 100% The average ' hydrocafbon destiuction rate fof 2000 was 98 8% The system was turned off from January 18, 2001 until January 24, 2001 for repairs The efficiency rate upon restarting the system was 69% The system was restarted for efficiency monitoring on January 25 and February 6, 2001 Destruction efficiency was 80 3% and 79 6% on those respective days Because of the low efficiency upon restarting the system, additional monitoi ing of and adjustments to the system were conducted in an attempt to achieve proper efficiency Because 95% efficiency could not be achieved the system was removed from service pending farther evnhintion 5.0 DISCUSSION OF RESULTS 5 1 DISCUSSION OF GROUNDWATER ELEVATIONS The average depth to groundwater measured during the April 2001 groundwater-monitoring event was approximately 32 1 feet below the monitor well measuring points, which is approximately 14 to 18 feet ' above the top of all monitoring well screens The groundwater elevation ranged from 18 55 to 19 61 feet ' �� CONDOR