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S <br /> � I <br /> - 1 <br /> PACIFIC <br /> ' ENVIRONMENTAL <br /> GROUP INC. <br /> 1 S . <br /> OCT z 3 <br /> ENVIRONNii.ir,�,QL HEALTH <br /> October 15, 1991 PEF*4iT/SL'VICI=S <br /> Project 310-01.02 <br /> Ms. Penny Silzer <br /> UNOCAL Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> San Ramon, California 94583 <br /> Re: UNOCAL Bull;Plant 0788 <br /> 8203 East 11th Street <br /> Tracy, California <br /> Dear Ms.Silzer: <br /> This letter presents the findings of aquarterly groundwater monitoring program <br /> being conducted by Pacific Environmental Group,Inc.(PACIFIC) at the site <br /> referenced above (Figure 1). The most recent groundwater monitoring event tool: <br /> place on August 30, 1991. At this time, oundwater levels IS w ere measured to assist <br /> in PACIFIC's hydrogeologic characterization of the site, and groundwater samples <br /> were collected for certified laboratory analysis. <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 is the western <br /> portion of the property(Figure 2). The 19,500-gallon tanks contain diesel and <br /> super unleaded gasoline,and the 20,000-gallon tanks contain regular leaded <br /> gasoline and unleaded gasoline. There are currently six groundwater monitoring <br /> wells on site, designated U-1 through U-6. The total depths of site wells range <br /> from 1S feet to 27 feet,and all wells are constructed of 3-inch diameter PVC <br /> casing. <br /> 1603 Civic Center Drive,Suite 202,S,inia ClaraFAX: (411N1?43•Sal I 1 <br /> California'15050 14081 984-t,5 3fi <br /> 620 Contra Cn,13$pule+aril.suite 2119,Pleasant Hill,CIhio+nia 94523 {4 t5)1325.013.55 FAX: 14825.O1itt� <br />