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Diamond Lumber Manteca Quarterly Groundwater Monttonng Page 8 TABLE 2: Analytical Groundwater Data BEWW4 BW-MW5 ow-o6 Dc=rnt=13, 191 Volatile H drocarbons NI NI NI 3,600 b 2,700 b 37,000 b Benzene NI NI NI 100 b 51 b 790 b Toluene NI Ni NI 36 b 54 b 1000 b Eth (benzene NI Ni NI 23 b (�1 7Tppb 430 b X Penes NI NI NI 89 b 72 b 1,4W b Lead NI NI NI NS NS NS Gabe 13, 1,991 Volatile Hydrocarbons NI NI NI 1,500 b 59,000 b 4,200 b Benzene NI NI NI 86 ppb 9,400 ppb 550 b Toluene NI NI NI 14 ppb 10,000 ppb ND Eth lbenzene NI NI NI 74 ppb 1,200 ppb 180 ppb Xylenes NI NI NI 140 Prib 7,300 ppb 360 ppb Lead NI NI NI D1 November 24 1491 k Volatile H drocarbons ND ND ND NS NS NS Benzene ND 16 ppb ND NS NS NS Toluene ND ND ND NS NS NS Ethvlbenzene ND I ND ND NS NS NS Xylenes ND 090 ppb ND NS NS NS LeadXppb 150 ppb 1 24 ppb I NS I NS NS 6, 1992 Volatile Hydrocarbons ND 1 800 b ND NS NS NS Benzene ND 220 b ND NS NS NS Toluene ND ND ND NS NS NS Eth lbenzene ND ND ND NS NS NS Xylenes ND 120 b ND N5 NS NS Lead 26 b b b NS NS NS Volatile Hydrocarbons ND b ND �t b .–L,1 (�o.o D Benzene ND ND 360 b � j,61 b b J10 b Toluene ND obl$V b ND 1 -62 b 610%49 b MID EthNlbenzene ND .-Sfd6 b ND X03– b b 344) XNlenes ND F(P}eff'bpb ND 640b 1 _9zpb � >� Lead 48 ppb 100 ppb 14 ppb 24 ppb 75 b 310 ppb —� NO TES NI = No sample collected because monitoring well had not yet been installed S NS = No sample collected ND = Analytes reported as ND were not present above detection limits n Detection Limits '( Volatile Hydrocarbons 50pb (during)an 1990, Oct 1991, Nov 1991 and April 1992 sampling ev ts) 00 t pppb (during Aug 1992 sampling event) Benzene 0 5 b Toluene 0 5 ppb f EthyEbenzene 0 5 ppb Xyyadenes 0 5 ppb 5 ppb (during Nov 1991 & April 1992 sampling events) 1 ppb (during Oct 1992 and Aug 1992 sampling events) Steffen Robertson and Kirsten 3zw•a++3 a• ,�