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Diamond Lumber Manteca Quarterly Groundwater Monitoring Page 8 <br /> TABLE 2: Analytical Groundwater Data <br /> BM-W4 AFI-MW5 I BEWWG <br /> itesexn>rer 13,1989 <br /> Volatile H drocarbons NI NI NI 3,600 ppb 2,700 ppb 37,000 ppb <br /> Benzene NI NI NI 100 ppb 51 ppb 790 ppb <br /> Toluene NI NI NI 36 ppb 54 ppb 1,000 ppb <br /> Eth lbenzene NI NI I NI 1 23 PPb 1 1 7 Ppb 1 430 ppb <br /> xylenes NI NI NI 89 ppb 72 PPb 1,400 Pvb <br /> Lead NI NI NI NS NS NS <br /> 000be` #5 1991 <br /> Volatile Hydrocarbons NI NI NI 1,500 PPb 59,000 ppb 4,200 ppb <br /> Benzene NI NI NI 86 Ppb 9,400 ppb 550 ppb <br /> Toluene NI NI NI 14 ppb 10,000 ppb ND <br /> Eth lbenzene NI NI NI 79 pPb 1,200 ppb 180 ppb <br /> Xylenes NI NI NI 140 ppb 7,300 ppb J 360 ppb <br /> Lead NI NI NI 2 8 ppb 9 5 b 330 b <br /> November•'M 1991 <br /> Volatile Hydrocarbons ND ND ND NS NS NS <br /> Benzene ND 1 6 ppb ND NS NS NS <br /> Toluene ND ND ND NS NS NS <br /> Eth lbenzene ND ND ND i NS NS NS <br /> Xylenes ND 0 90 PPb ND NS NS NS <br /> Lead 18 b 350 ppb 24 ppb NS NS NS <br /> xa 6,1991 <br /> Volatile Hydrocarbons ND 1,800 2pb ND NS NS NS <br /> Benzene ND 220 b ND NS NS NS <br /> Toluene ND ND ND NS NS NS <br /> Eth lbenzene ND ND ND NS NS NS <br /> Xylenes ND 120 b ND NS NS NS <br /> Lead 26 b 57 b 27 b NS NS NS <br /> Au ust 31 1992 <br /> Volatile Hydrocarbons ND 100 b ND 3,100 b 39,000 b 6 200 b <br /> Benzene ND 2 ppb ND 360 ppb 10,000 ppb 1 100 ppb <br /> Toluene ND ND ND 68 2pb 6,100 p2b 380 b <br /> Eth lbenzene ND 08ppb ND 62 b i 940 b 340 ppb <br /> X lens ND 0 6 ppb ND 640 ppb 1 7,000 ppb 980 ppb <br /> Lead 1 48 b 100 ppb 1 14 ppb 1 24 ppb 1 75 ppb 1 310 p ob <br /> NOTES <br /> NI = No sample collected because monitoring well had not yet been installed <br /> NS = No sample collected <br /> ND = Analytes reported as ND were not present above detection limits <br /> Detection Limits <br /> Volatile Hydrocarbons 50 ppb (during ]an 1990, Oct 1991, Nov 1991, and April 1992 sampling events) <br /> 0 02 ppb (during Aug 1992 sampling event) <br /> Benzene 0 5 ppb <br /> Toluene 0 5 ppb <br /> Ethylbenzene 0 5 ppb <br /> Xylenes 0 5 ppb <br /> Lead 5 ppb (during Nov 1991 & April 1992 sampling events) <br /> 1 ppb (during Oct 1992 and Aug 1992 sampling events) <br /> 32504 2413 qtrly man Steffen Robertsonand Kirsten <br />