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PACIFIC <br /> ENVIRONI MENTAL <br /> GROUP INC. <br /> 3 <br /> l <br /> E C E <br /> December 31, 1991 a <br /> Project 310-01.02 JAN 13 1992 <br /> ENVIRONM�: /` i, •, : '.3k <br /> Ms.Penny Silzer <br /> UNOCf,,L.Corporation <br /> 2000 Crow Canyon Place,Suite 400 <br /> San Ramon, California 94583 <br /> RFs: UNOCAL Bulk Plant 0788 <br /> 8203 East ilth Street <br /> Tracy,California <br /> Dear Ms.Silzer: <br /> This letter presents the findings of a quarterly groundwater monitoring program <br /> being conducted by Pack Environmental Group,Inc. (PACIFIC)for UNOCAL <br /> Corporation(UNOCAL)at the site referen��d above(Figure 1), The most recent <br /> groundwater monitoring event was conducted on November 6, 1991, and included <br /> I the collection of groundwater elevation data and the sampling of groundwater <br /> from site monitoring wells for laboratory analysis. A brief description of additional <br /> investigation to be conducted at the site is also included. <br /> i <br /> Site Conditions <br /> i The site is an operating UNOCAL bulk plant with two 19,500-gallon and <br /> two 20,000-gallon above-ground storage tanks located in the western portion of the <br /> property(Figure 2). The 19,500-gallon tanks contain diesel and super unleaded <br /> gasoline, and the 20,000-gallon tanks contain regular leaded gasoline and unleaded <br /> i gasoline. There is one water-supply well located on-site. This well is <br /> information from site personnel. This well <br /> approximately 80 feet deep basad on <br /> was sampled during November 1990,and did not contain detectable <br /> concentrations of total petroleum hydrocarbons calculated as gasoline (TPH- <br /> gasoline),total semi-and non-volatile hydrocarbons calculated as diesel(TPH- <br /> diesel <br /> },and benzene,toluene, ethylbenzene,and xylenes (BTEX compounds). <br /> There are currently six groundwater monitoring wells on site, designated as Wells <br /> U-1 through U-6. The total depths of site wells range from 18 feet to 27 feet,and <br /> 101)1 Civic Comer I hive.Soile 202.Santa Clara.California ),o5f) 14085 984.13 ib FAY: (41113)2-3,3911 <br /> 620 Contra Co:m 134)ulek ord.Srti,e 20n,Pleasant Hill,California 9432.1 1415)823-0, f AX: 141 s B'°5-1 833 <br />