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�;n?%.^X ';�''� e�a�.z'�— _ ;�wc.'�,.,� 5"m�^w•.s��,�� �� �: sa��"".� xsY�- ``�8 .�.�" :. ,�,-'dam' i £ `_'?�,-.'' - �- � ��' <br /> r y '�-��` -"`&`� ,� ,„^^rR�'�".� I-� ' r.,r.^,�: r����'��' ..� �s,.���� Jc�, di r .r . �'""' =�"�" .'.:°�t�^,�. � .i4*r'-ti',•"p. <br /> M; <br /> Vw <br /> Ms.Diane Hin-con <br /> January 11, 19,191 <br /> Page 2 <br /> Ground Water Analytical Results <br /> Each ground wa+er sample was submitted for analysis of benzene,toluene,ethylbenzene,xylenes,and <br /> total petroleum hydrocarbons (TPH) as gasoline using U.S. Environmental Protection Agenvy and <br /> California Department of Health Scrvices approved methods. The analytical laboratory results of ground <br /> water samples collected on October 24, 1990, are summarized in Table 2. Previous results are also <br /> provided in Table 2 for comparison. Copies of the certified laboratory reports for October 1990 are <br /> included in Enclosure B. <br /> Analytical laboratory result%indicate a decline in the concentration of petroleum constituents from July <br /> to October 1990,except in monitoring well MW-1. The concentration of benzene and TPH doubled in <br /> monitoring well MW-1 during this time period. However,these concentrations are significantly less than <br /> the concentration of benzene and TPH in other monitoring wells. <br /> Delta will collect ground water samples the last week of January 1991 and submit a written report to <br /> the San Joaquin County, Department of Environmental Health, the week beginning March 18, 1991. <br /> If you have questions regarding the January sampling event or this letter report, please call me at <br /> (916) 638-2085. <br /> Sincerely, <br /> Dl,'LTA ENVIRONMENTAL CONSULTANTS, INC. <br /> Hugh].dJsiles <br /> Project Engineer <br /> Henry A.Dihm,P.E. <br /> Pvaject Manager <br /> HAD:HJM:ecd <br /> Encloi,ures <br /> cclenc: Ms.Barbara Mickelson,Delta Environmental Consultants,Inc. <br /> Mr.Jack Brastad,Shell Oil Company <br /> Mr.Jim Maughan;Central Valley Regional Water Quality Control Board <br /> ,moi <br />