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C Superior Precision Aria/ytica/, Inc. JUL 16 2 <br /> 835 Arnold Drive Suite 106 • Martinez California 94553 • (510) 229-0166 / fax {510) 229 0916 <br /> Alton Geoscience Pro)ect 31-0329 <br /> Attn: TODD PEARSON Reported 07/10/92 <br /> TOTAL PETROLEUM HYDROCARBONS <br /> Lab # Sample Identification Sampled Analyzed Matrix <br /> 86145- 1 TB-LB 07/01/92 07/10/92 Water <br /> 86145- 2 RINS 07/01/92 07/10/92 Water <br /> 86145- 3 MW-11 07/01/92 07/10/92 Water <br /> 86145- 4 MW-9 07/01/92 07/10/92 Water <br /> 86145- 5 MW-10 07/01/92 07/10/92 Water <br /> 86145- 6 MW-8 07/01/92 07/10/92 Water <br /> 86145- 7 MW-5 07/01/92 07/10/92 Water <br /> 86145- 8 MW-5A 07/01/92 07/10/92 Water <br /> 86145- 9 MW-2A 07/01/92 07/10/92 Water <br /> 86145-10 MW-4A 07/01/92 07/10/92 Water <br /> RESULTS OF ANALYSIS <br /> [Laboratory Number: 86145- 1 86145- 2 86145- 3 86145- 4 86145- 5 <br /> Gasoline: ND< 50 ND<50 ND<50 ND<50 ND<50 <br /> Benzene: ND<0 .5 ND<0.5 ND<0 .5 ND<0 . 5 ND<0 .5 <br /> Toluene: ND<0.5 ND<0.5 ND<0 .5 ND<0 . 5 ND<0.5 <br /> Ethyl Benzene: ND<0.5 ND<0.5 ND<0 . 5 ND<0 . 5 ND<0.5 <br /> Xylenes : ND<0 .5 ND<0.5 ND<0 . 5 ND<0 . 5 ND<0 .5 <br /> Concentration: ug/L ug/L ug/L ug/L ug/L <br /> Laboratory Number: 86145- 6 86145- 7 86145- 8 86145- 9 86145-10 <br /> Gasoline: ND<50 ND<50 ND<50 70 ND<50 <br /> Benzene: ND<0 .5 ND<0.5 ND<0 . 5 0 .7 ND<0 .5 <br /> Toluene: ND<0. 5 ND<0 .5 ND<0 .5 ND<0 . 5 ND<0.5 <br /> Ethyl Benzene: ND<0 .5 ND<0. 5 ND<0 . 5 4 . 5 ND<0.5 <br /> Xylenes : ND<0 .5 ND<0.5 ND<0 . 5 2 . 9 ND<0.5 <br /> Concentration: ug/L ug/L ug/L ug/L ug/L <br /> Page 1 of 2 <br /> Certified Laboratories <br />