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} <br /> PACIFIC <br /> ENVIRONMENTAL <br /> GROUP INC. <br /> EliNVIRONiP:T, f" EA11 f i <br /> FEC?hs{T!'S'1_l? CCS <br /> April'-73, 1991 <br /> Project 310-01.02 <br /> Mr.Ron Bock <br /> UNOCAL Corporation <br /> 2000 Crow Canyon Place,Suite 400 <br /> San Ramon, California 94583 <br /> Pe: UNOCAL Bulk Plant 0788 <br /> 8203 East 11th Street <br /> Tracy, California <br /> Dear Mr.Bock: <br /> This letter presents the findings of a quarterly groundwater monitoring program <br /> _ being performed by Pacific Environmental Gro.i,Inc. (PACIFIC) at the above <br /> referenced site (Figure 1). The most recent 90undwater monitoring event took S <br /> place.on February 14, 1991,and includes the sampling and analysis of groundwater I. <br /> from site wells, and preparation of groundwater elevation contour and dissolved { <br /> hydrocarbon concentration maps. <br /> i <br /> Site Conditions <br /> The site is an operating UNOCAL bulk plant with two 19,500-gallon and <br /> two 20,000-gallon above-ground hydrocarbon storage tanks located in the western f <br /> portion of the property(Figure 2). The 19,300-gallon tanks contain diesel and <br /> super unleaded gasoline,and the,)O,OOQ•galion tanks contain regular leaded <br /> gasoline and unleaded sasohne. There are currently#hrce grplindwate <br /> o'1torug webs An seta: :stgnia'ted U-1 U ?,.and U .� sit�wallas iZf�et <br /> s, Rand all wells are constructed of 3-inch diameter PVC casing. <br /> Findings <br /> w Hund actlion <br /> ts'coundwatcc occurred at an approximate depth of 9 feet belo gra <br /> February 14, 1991 with a nvr 'vresterly how:�tracuon at a Bradtemt oi?0�0¢ <br /> (Table 1-Figure 3).This data indicates an approximate-0.b-foot_increase_in <br /> 1601 Civic Center Drive, Suite 202,Santa Clara:California 95050 (4081 984b563 FAX: (408)243-3911 <br /> 620 Contra Costa Boulevard,Suite 209, Pleasant Hill, California 94523 (415)825-0855 FAX: 54151 825-0882 <br />