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TABLE 4 <br /> Western Stone Products - Tracy <br /> Sununary of Laboratory Analysis - Water <br /> (Page 2 of 3) <br /> (results in PPb) <br /> ::DATE SAMPLE ID B 7 E 7C TPHa......: <br /> 01/07/92 WSPTR MW-1 ND ND ND ND ND <br /> WSPTR MW-2 ND ND ND ND ND <br /> WSPTR MW-3 ND ND ND ND ND <br /> WSPTR MW-4 ND ND ND ND ND <br /> WSPTR MW-4D ND ND 1.0 ND ND <br /> WSPTR MW-1 D ND ND ND ND ND <br /> 04/07/92 WSPTR MW-1 ND ND ND ND ND <br /> WSPTR MW-2 ND ND ND ND ND <br /> WSPTR MW-3 ND ND ND ND ND <br /> WSPTR MW-4 ND ND ND ND ND <br /> 07/27/92 WSPTR MW-3 ND 0.55 ND ND ND <br /> WSPTR MW-4 ND 0.60 1.2 0.57 ND <br /> 10/07/92 WSPTR MW-3 ND ND ND ND ND <br /> WSPTR MW-4 ND ND ND ND ND <br /> 01/26/93 WSPTR MW-3 ND ND ND ND ND <br /> 04/19/93 WSPTR MW-3 ND ND ND ND ND <br /> MDL 0.50 0.50 0.50 0.50 50 <br /> MCL 1 40* 30* 20* NE <br /> NOTES: <br /> ppb = Parts per Billion ND = Not Detected <br /> B = Benzene MCL = Maximum Contaminant Levels, State of <br /> T = Toluene California Drinking Water Standards <br /> E = Ethylbenzene NE = Not Established <br /> X — Xylenes I — Proposed Secondary Level <br /> BTEX — Analyzed by EPA Method 8020 <br /> TPHD = Total Petroleum Hydrocarbons as Diesel, Analyzed by EPA Method 3510/8015 <br /> H20-LA B.TB L <br />