ARCHIVED REPORTS_XR0006676 - Laserfiche WebLink

Home Browse Search

1 ' Quarterly Monitoring Report,October 2000 Canepa's Car Wash(Pacitic Avenue) 41Page-5 ' TABLE 2 LABORATORY ANALYTICAL RESULTS (OCTOBER 2000) ' B T E X TPH-G MTBE Reporting limits 03 03 03 06 005 1 0 ' Monitor Well l D }ig/L µg/L µg/L µg/L mg/L µfill, 1707-MW1-10112100 670 230 60 150 3 0 1,100 ' 1707-MW2-10/12/00 64,000 3,200 2,000 12,000 190 ND(200)* 1707-MW3-10/12100 04 04 ND ND ND 25 ' 1707-M W4-10112/00 06 30 ND ND 0 10 ND 1707-MW5-10/12/00 14 27 ND 1 1 005 ND 1707-MW6-10/12/00 06 14 ND 06 ND ND 1707-MW7-10/12/00 ND ND ND ND ND ND 1707-MW8-10/12/00 ND ND ND ND ND ND Unit Conversions Analytical µg/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 ND(X)=not detected at or above a raised laboratory reporting limit of X *=used method 8260B for detecting MTBE I4 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 destruction efficiency of the thermal oxidation unit Vacuum measurements in inches of water are recorded from ports installed at the SVE wells to evaluate the radius of influence Various other system parameters are monitored to maintain optimum performance of the ISVE system (see SVE System Log, Appendix D) The destruction efficiency for 1999 ranged from 95 27%to 99 94% and for the year 2000, the destruction I efficiency has ranged from 96 66% to 100% The average destruction rate for 1999 was 98 71% and for 2000 was 98 8% The SVE system has been down a total of 90 days, approximately 13% of the time, since operation was initiated on March 15, 1999 I 5 0 DISCUSSION OF RESULTS 5 1 DISCUSSION OF GROUNDWATER ELEVATIONS The average depth to groundwater measured during the October 2000 groundwater-monitoring event was • approximately 34 9 feet below the monitor well measuring points, Which is approximately 10 to 15 feet above the top of all monitoring well screens The groundwater elevation ranged from 2134 to 22 47 feet bms] Since November 1993, the depth to groundwater at the site has ranged from approximately 54 5 �� CONDOR