ARCHIVED REPORTS_XR0007370 CASE 2

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Table 4 TPH-Diesel & BTEX Concentrations Tracy/Kerlinger Aggregate Plant Groundwater Monitoring Well Sampling Results Sample Sample Depth to Water Groundwater Conductivity pH TPH-diesel BTEX Location Date (fbg) Elev (mst) (µmhcs/cm) (µg/L) (Ag/L) Notes I MW-04 1/8/2003 12481 6307 1380 740 NIA NIA 2/18/2003 12357 6431 1516 780 <50µg/L NIA 7/17/2003 12634 61 54 1400 728 <50µg/L <0 5µg/L 11/17/2003 12506 6282 1500 725 <50µg/L <0 5µg/L I 2/25/2004 12536 6252 1500 738 <50µg1L <0 5µg/L 6/30/2004 N/A NIA N/A N/A N/A N/A 7/21/2004 12766 6022 1500 715 <50µg/L <0 5µg/L MW-05 1/8/2003 12565 6297 1500 734 NIA NIA 2/18/2003 12454 6408 1597 680 <50 4g/L N/A 7/17/2003 12738 61 24 1450 723 <50 gg/L <0 5µg/L I 11/17/2003 12581 6281 1400 728 <50 pg/L <0 5µg/!L 2/25/2004 12547 6315 1500 730 <50µg/L <0 5µg/!L 6/30/2004 N/A NIA N/A NIA NIA NIA I 7/21/2004 12843 6019 1500 710 85 <0 5µg/L NDP MW-06 1/8/2003 11740 6434 1400 727 NIA NIA 2/18/2003 11595 6579 1560 720 <50µg/L NIA I . 7/17/2003 11920 6254 1550 743 <50µg/L <0 5µg/L 11/17/2003 11826 6348 1500 725 89 <0 5}tg/L 2/25/2004 11733 6441 1500 755 <50 gg/L <0 5µg/L I 6/30/2004 NIA NIA N/A NIA NIA NIA 7/21/2004 121 10 6064 1600 728 <50µg1L <0 5 gg/L MW-07 6/30/2004 12684 N/A 1532 790 <50 gg/L 29 11, 2 7, 14 1 I 7/21/2004 12714 *60 20 1500 719 <50µglL <0 5µg/L MW-08 6/30/2004 12857 N/A 1498 790 <50 lug/L 2 5, 11,2 8, 16 1 7/21/2004 12875 *60 20 1 1400 706 99 <0 5 gg/L NDP Notes *=Inferred elevation based on well location and depth to water measurements Well not professionally surveyed 1 =Sampled immediately following well development g=Feet below grade msl=Feet above mean sea-level N/A=Not analyzed for NDP=Hydrocarbon does not match the pattern of the laboratory's Diesel standard for fresh product I I I i I