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WM s i r s i s Ta • Historical Benzene Concentrations to Groundwater The Earthgratns Company 2651 South Airport Way,Stockton,California Date Sample IDI Concentration u MW-1 MW-2 MW-3 MW4 MW-5 MW-6 MW-7 MW-8 MW-9 MW-10 MW-11 MW-12 MW-13 SPA SP-2 PZ-1 PZ-2 7/10/1987 6,800 ND(O 3 ND(O 3 75 4/26/1988 2,300 19 ND(O 3 3/19/1990 5,120 ND(O 3 ND(O 3 ND(O 3 ND(O 3 ND(O 3 558 12/20/1990 7,100 ND(O 3 ND(O 3 ND(O 3 ND(O 3 4/9/1992 1,620 8 ND(O 3 ND(O 3 ND(O 5 8/19/1992 4,720 ND(O 3 12/23/1992 2,650 ND(O 5 4/7/1993 2,300 ND(O 3 ND(O 3 7/30/1993 1,900 ND(O 3 ND(O 3 ND(O 3 j 10/21/1993 2,200 ND(O 3 ND(O 3 12/29/1993 1,700 ND(O 3 ND(O 3 3/23/1994 2000 ND(O 3 ND(O 3 230 ND(O 3 ND(O 5 ND(O 5 17 ND(O 5 ND(O 5 99 6/7/1994 1,500 046 ND03 210 ND03 ND03 ND03 43 052 045 150 9/8/1994 1,500 21 ND(O 3 180 ND(O 3 ND(O 3 052 92 ND(O 3 ND(O 3 160 2/12/1996 2,400 ND03 ND03 75 ND03 NDQ3 ND03 ND03 31 49 5/14/1996 960 ND05 ND05 66 ND05 ND05 12 ND05 74 65 9/18/1996 890 ND05 ND05 ND05 ND05 ND05 ND05 ND05 55 21 12/18/1996 780 ND05 ND05 54 ND05 ND05 ND05 ND05 ND05 ND05 ND05 16 ND05 7/15/1997 820 ND05 ND05 ND05 ND05 ND05 25 ND05 ND05 14 ND05 85 ND05 10/23/1997 500 ND(O 5 ND(O 5 ND(O 5 ND(O 5 NS 16 ND(O 5 NS 066 ND(O 5 32 ND(O 5 1/29/1998 950 NS NS NS NS NS ND(5 D ND 5 0 NS ND(12L 0 NS 17 ND(5 0 5/21/1998 620 NS NS NS ND(I 0 NS ND(1 0 ND 1 0 NS NS ND(i 0 26 NS 10/28/1998 170 ND(O 5 NS 1 1 ND(O 5 NS ND(O 5 ND 0 5 NS 10 ND(O 5 11 ND(O 5 5/28/1999 240 ND05 ND05 ND05 ND05 ND05 ND05 ND05 ND05 28 ND05 18 ND05 8/18/1999 630 NS NS 13 NS NS NS NS 12 150 NS 57 11 3300 3700 230 11/8/1999 1,400 NS NS ND(O 5 NS NS NS NS ND 0 5 ND(O 5 NS 14 ND(O 5 2800 24 190 18 3/13/2000 280 NS NS 19 NS NS NS NS ND 0 5 23 NS 59 ND(O 5 1400 39 190 31 7/2/2000 1,200 NS NS 7 NS NS NS NS 46 91 NS 26 62 1900 25 230 60 10/19/2000 560 NS NS ND(I 0 NS NS NS NS ND(O 5 ND(O 5 NS 57 ND 0 5 2000 33 4600 81 1/18/2001 840 NS NS ND(O 5 NS NS NS NS ND(O 5 ND(O 5 NS 53 ND(O 5 1900 ND(O 5 620 14 4/19/2001 950 NS NS ND(O 5 NS NS NS NS ND(O 5 ND(O 5 NS 22 ND(O 5 1500 35 650 200 7/19/2001 970 NS NS ND(O 5 NS NS NS NS ND(O 5 ND(O 5 NS 18 ND(O 5 2000 11 3700 35 10/24/2001 190 NS NS ND(O 5 NS NS NS NS ND(O 5 ND(O 5 NS 17 ND(O 5 2100 fib 5100 140 1/24/2002 910 NS NS 096 NS NS NS NS ND(O 5 ND(O 5 NS 14 ND(O 5 2100 710 3800 ND 50 4/26/2002 18 NS NS ND(O 5 NS NS NS NS ND(O 5 ND 0 5 NS ND(O 5 ND(O 5 620 ND(O 5 370 ND(2 0 8/1/2002 3 NS NS ND(O 5 NS NS NS NS ND(O 5 ND(O 5 NS ND(O 5 ND(O 5 670 35 280 48 11/5/2002 ND(O 5 NS NS ND(O 5 NS NS NS NS ND(O 5 ND(O 5 NS ND(O 5 ND(O 5 490 12 ND(O 5 ND(O 5 2/5/2003 67 ND05 ND 05 ND05 ND05 ND05 13 ND05 ND05 ND05 ND05 ND05 NQ05 490 ND50 75 ND50 6/24/2004 31 ND05 ND05 ND05 ND(05) ND05 ND(05)__ ND05 ND05 ND05 21 ND05 ND05 920 ND25 2200 NDi00 10"/2004 180 NS NS NS ND(O 5 NS 32 ND(O 5 NS ND(O 5 23 1 9 NS 1700 ND(2 5 1800 110 Notes ug/L Results reported in micrograms per liter ND Not detected at or above the laboratory detection limit shown in parentheses NS Not sampled ENV!624001321121332eg 1 Investigation and Quarterly Reports/Historic Benzene Results XLS/Benzene Values Page 1 of 1