ARCHIVED REPORTS_20100427 ATC 1Q2010 GWMR COMPLETE

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Table A3.1 Historical Analytical Data Summary Crop Production Services,Vernalis,California Dmron-EPA 632 Depth a Groundwater 1,2,3-TCP-SRL 1,2-DCB-EPA 82606 1,2-DEP-EPA 82606 1,3-DCB-EPA 82606 1,4-DCB-EPA 82606 Ammonia as Nitroge Bromodichlorometha Chlorobenzene-EP Chloroform-EPA Dibromochlorometha Nitrate as N-SM Total Oxidizable N- TOC Elevation m a) m (�> m m a) DBCP-EPA 504_1 1 832183/SW846 EDB-EPA 504_1 n> m Well ID Date Groundwater Elevation"(feet 524M -SM 4500-NH3 B/C e-EPA 82606 82606 8260E - ne-EPA 826013'� 4500-NO3 E SM 4500-NO3 E (feet above MSL) (feet be]-TOC) above MSL) (µg/L) (µg/L) (µ9/L) (µg/L) (µg/L) (mg/L) (µg/L) (µg/L) (99/L) (µg/L) (µms) 832183 (Ng/L) (mg.) (-9/L) --- --- --- 145 MW-6 8/31/2004 ___ ___ ___ 57.5 ___ ___ ___ ___ 734 ___ ___ ___ ___ ___ --- --- --- 276 MW-6 11/23/2004 --- --- --- <L0 --- --- --- --- 659 --- --- --- --- --- --- --- --- 181 MW-6 6/2/2005 --- --- --- 29.4 --- --- --- --- 641 ___ ___ ___ ___ ___ --- --- --- 140 MW-6 8/23/2005 --- --- --- 34.7 --- --- --- --- 631 --- --- --- --- --- ___ ___ ___ 204 MW-6 11292005 --- --- --- 42.5 --- --- --- --- 649 ___ ___ ___ ___ ___ --- --- --- 123 MW-6 2/27/2006 --- --- --- 24 --- --- --- --- 642 ___ ___ ___ ___ ___ --- --- --- 157 MW-6 6/8/2006 --- --- --- 40.9 --- --- --- --- 553 ___ ___ ___ ___ ___ --- --- --- 143 MW-6R 9/20/2007 94.58 30.50 64.08 6.7 --- 67 --- --- 580 --- --- --- --- --- --- --- --- 82 MW-6R 9/20/2007 94.58 --- --- 5.4 --- --- --- --- 580 --- --- --- --- --- --- --- --- 83 MW-6R 1/24/2008 94.58 32.10 62.48 --- --- --- --- --- --- --- --- --- --- --- --- --- --- 82.9 MW-6R 3/5/2008 94.58 --- --- 14 11.0 48 <1.0 <1.0 --- <1.0 3.1 <1.0 <0.20 <1.0 --- 6.4 --- 75 MW-6R 8/19/2008 94.58 32.40 62.18 5.3 <1.0 110 <1.0 <1.0 680 <1.0 5.2 <1.0 0.024 <1.0 18 1.8 --- 22 MW-6R 1/26/2009 94.58 33.12 61.46 11 <2.0 190 <2.0 <2.0 740 <2.0 5.2 <2.0 0.32 <2.0 --- 1.2 --- 87 MW-6R 9/23/2009 94.58 32.71 61.87 6 <0.5 61 <0.5 <0.5 539 <0.5 4.9 <0.5 0.043 <0.5 24101 1.3 --- 82.9 MW-6R 3/4/2010 94.58 34.46 60.12 3.3 <0.5 38 <0.5 <0.5 347 <0.5 4.2 <0.5 <0.025 <0.5 --- 0.51 --- 116 ___ ___ ___ 16 MW-7/MW-7D 1/24/2008 95.95 33.51 62.44 2.3/2.1 <1.0 35 <1.0 <1.0 59/59 <1.0 <1.0 <1.0 0.065 <1.0 2J 0.093 --- 33/34 MW-7/MW-7D 8/19/2008 95.95 33.75 62.20 1.2/1.1 <1.0 15 <1.0 I <1.0 41/85 <1.0 <i-0 <1.0 <0.010 <1.0 lJ 0.14 --- 49/42 MW-7/MW-7D 1/26/2009 95.95 34.68 61.27 1.1/1.1 <I.0/<I.0 47/47 <1.0/<1.0 <1.0/<1.0 83/83 <1.0/<LO 11.0/<LO <LO/<1.0 <0.010/<0.010 <1.0/<1.0 2J/21 0.069/0.068 --- 39/41 MW-7 9/23/2009 95.95 34.12 61.83 0.26 1 <0.5/<0.5 18/19 <0.5/<0.5 <0.5/<0.5 40.6 <0.5/<0.5 <0.5/<0.5 <0.5/<0.5 10.025 <0.5/<0.5 1.7 <0.025 --- 2.73 MW-7/MW-7D 3/4/2010 95.95 35.89 60.06 0.43 <0.5/<0.5 29/30 <0.5/<0.5 <0.5/<0.5 63 <0.5/<0.5 <0.5/<0.5 <0.5/<0.5 <0.025 <0.5/<0.5 2.3 <0.025 --- 21 California Maximum Contaminant Level(MCL),lune 2001 NA 6001 5 NA(6) 5 NA t4I 100 (a) 0.2 NA(4'5) NA 0.05 10 10 Notes: (1)Beginning in 2005,samples analyzed for nitrate-nitrite as N by EPA Method 353.3 (4)Total trihalomethanes(sum of bromodichloromethane,dibromochloromethane,bromoform,and chloroform),MCL=100 ug/L. /=sample remit/duplicate result. 'Groundwater Elevations based on 31 August 2007 Survey(NAVE(2)VOCs analyzed by EPA Method 8021B(November 1999-August 2003), (5)Chemical listed with California Drinking Water Standards as an unregulated compound requiring monitoring. -=not analyzed or not reported MSL-mean sea level EPA Method 8260B(March 2004-current) (6)California taste and odor threshold action level=130 mg/L for sum of 1,2-dichlorobenzene and 1,3-dichlorobenzene. J=Estimated value,below quantitation limit (3)MW-2 sample/duplicate had one-time detections of (7)Sample has a dilution factor of 10. "NA"=not available methiocarb(EPA 632)at 6.2/6.0 ug/L(no MCL). (8)Sample has a dilution factor of 5. Historical Analytical Data Summary Page 4 of 4