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Diamond Lumber-Manteca Quarterly Groundwater Monuonng Page 6 TABLE 2: Analytical Groundwater Data S MW11 SRK l W2 SRK-M v3 -OrI- W4 n - w5 MI 11 iN •2 in 8E1 OM3 Pict BEI 01W-I WA BV 13.x489 Volatile Hydrocarbons NI NI NI 3,600 2,700 37,000 Benzene NI NI NI 100 51 790 Toluene NI NI NI 36 54 1,000 Eth%lbenzene NI NI Ni 23 17 430 Xvlenes NI NI NI 89 72 1,400 Lead NI NI NI N5 NS NS f�cEobCtct'S,199.1 Volatile Hydrocarbons NI NI Ni 1500 59,000 4,201) Benzene NI N1 N1 86 9,400 550 Toluene NI NI NI 14 10,000 <05 Eth (benzene NI NI NI 79 1,200 180 Xylenes Ni NI NI 140 7,300 360 Lead NI NI NI 2 8 95 330 1�nrerrtber 2�1 1991 Volatile Hydrocarbons <50 <50 <50 NS NS NS Benzene <05 1 6 <0 5 NS NS NS Toluene <0 5 <0 5 <0 5 NS NS NS Ethvlbenzene <0 5 <0 5 <0 5 NS NS NS 1 Xylenes <0 5 090 1 <0 5 1 NS NS NS 1 Lead 18 350 24 NS NS NS A nl 6 1992 Volatile Hydrocarbons <50 1 800 <0 5 NS NS NS Benzene <0 5 220 <0 5 NS NS NS Toluene <0 5 <0 5 <0 5 NS NS NS Ethvibenzene <0 5 <0 5 <0 5 NS NS NS Xvlenes <0 5 120 <0 5 NS NS NS Lead 26 57 27 NS NS NS An ust 3#, 1992 Volatile Hydrocarbons <20 100 <20 3,100 39,0 0 6,200 Benzene <0 5 2 <0 5 360 10,000 1,100 Toluene <0 5 <0 5 <0 5 68 6,100 380 Eth lbenzene <0 5 08 <0 5 62 940 340 X Penes <0 5 0 6 <0 5 640 7,000 980 Lead 48 100 14 24 75 310 February S 1993 Volatile Hydrocarbons <20 30 X20 2,800 40,000 I 500 Benzene 08 <0 3 10 1909 7,660 1607 Toluene 08 <0 3 1 2 66 3,025 1 3 Eth lbenzene 0 6 <0 3 09 103 885 476 Xylenes 16 <0 3 20 6944 9,500 393 Lead 3 36 3 12 41 46 NOTES f NI= No sample collected because monitoring well had not yet been installed NS= No sample collected All measurements to ppb nwa�an,N. Steffen Robertson and Kirsten