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.'� <br /> a <br /> PACIFIC <br /> ENVIRONMENTAL <br /> f,.. GROUP INC. k. <br /> OCT 2 3 <br /> ENVIRaNAlE rO-AL HEALTH <br /> October ctober 15, 1531 <br /> Project 310-01.02 <br /> i <br /> Ms.Penny Silzer <br /> UNOCAL C:rporation <br /> 2000 Crow Canyon Place,Suite 400 <br /> San Ramon, California 94583 <br /> Re: UNOCAL Bulk Plant 0788 <br /> I 8203 East 11th Street <br /> Tracy, California <br /> Dear Ms.Silzer: <br /> This letter presents the findings of a quarterly 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 took <br /> place on August 30, 1.99 1.. At this time,groundwater levels were measured to assist <br /> in PACIFIC's hydrogeologic characterization of the site, and groundwater samples <br /> were collected for certified laboratory analysis. <br /> I <br /> Site Conditions <br /> The site is an operating UNOCAL bulk plant with two 19,500-gallon and. 1 <br /> I <br /> two 20,000-gallon above-ground hydrocarbon storage tanks located in the western <br /> portion of the property(Figure 2). The 19,500-gallon tanks contain diesel and I <br /> super unleaded gasoline, and the 20,000-gallon tanks contain regular leaded <br /> gasoline and unleaded gasoline. There are currently six groundwater monitoring I <br /> wells on site,designated U-1 through U-6. The total depths of site wells range F <br /> from 18 feet to 27 feet,and all wells are constructed of 3-inch diameter PVC <br /> casing. i <br /> I <br /> f <br /> t I <br /> 1601 Civic Crnter Drive,Suite 202.Santa Clara.California')50511 1408)984-I6 36 FAX: 141181 243-1911 <br /> 620 Contra Costa Boolerard,Suite 2139.Pleasant Hill,California 94523 14151825.11855 FAX: 141 X18_15-t1t3132 <br />