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- <br /> t <br /> y <br /> 1 <br /> FA�CIFIC <br /> ENVIRONMEN7A!_ <br /> GROUP INC. <br /> 11AP 3 n )ant <br /> tldVtrC�id�vit -ALTH <br /> P .tRM<I i,'S1 RVICES <br /> March 24, 1992 <br /> Project 310-01.44 <br /> Nis,Penny Silzer <br /> UNOCAL Corporation <br /> 2000 Craw Canyon Place,Suite 400 <br /> San Ramon,California 94583 <br /> i <br /> Re: UNOCAL Bulk Plant 0788 <br /> 8203 East lith Street <br /> Tracy,California <br /> Dear Ms.Silzer: s <br /> This letter presents the findings of a quarterly groundwater monitoring program <br /> f being conducted by Pac.5c Environmental Group,Inc.(PACIFFIC)for UNOCAL <br /> Corporation(UNOCAL) at the site referenced above{Figure 1}. The most recent <br /> conducted on February 19, 1992,and included <br /> groundwater monitoring event was - <br /> 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 /> i investigation to be conducted at the site is also included. <br /> Site Conditions <br /> The site is an operating UNOCAL bulk plant with two 19,500-gallon and <br /> two 20,040-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 /> 0-gallon tanks contain regular leaded gasoline and unleaded <br /> gasoline,and the 20,44 <br /> gasoline. There is a water-supply well located on-site;and this well is <br /> information from site personnel <br /> approximately 80 feet deep based on . This well <br /> was sampled during November 1990,and did not contain detectable <br /> concentrations of total petroleum hydrocarbons calculated as gasoline(TPH- <br /> ga5oline), total semi-and non-volatile hydrocarbons calculated as diesel(TPH- <br /> diesel),or benzene,toluene,ethylbenzene,and.xylenes(BTEX compounds). <br /> ---- --- - There are currently six groundwater monitoring wells on site.designated U. -------- -- - --- <br /> through U-b. The total depths of site wells range from 18.feet to 27 feet, and alI <br /> wells are constructed of 3-inch diameter PVC easing. <br /> 1b01 Civic Center Drive,Suite 202.San:a Clara.California 95050 (408)1384-65,36 FAX: ({08) 4J-391 1 <br /> 620 Contra Costa l3ouie�ard.Suite 2U9,Pleasant Hi11,California 94533 (514)625-1)A55 FAX: 151111 is�5.066? <br />