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PACIFIC <br /> ENVIRONMENTAL <br /> GROUP INC. <br /> RE - <br /> December 31, 1991 <br /> "TIT <br /> Project 310-01.02 JAN 13 1992 <br /> ENVIRONMI:NTP,;_ <br /> Ms,Penny Silzer <br /> UNOCAL Cor;oration <br /> 2000 Crow Canyon Place,Suite 400 <br /> San Ramon, California 94583 <br /> Re: UNOCAL Bulk Plant 0788 <br /> 8203 East 11th Street <br /> Tracy, California <br /> Dear Ms.Siler: <br /> a <br /> This letter presents the findings of a quarterly groundwater.monitoring program <br /> being conducted by Pacific Environmental Group,Inc.(PACIFIC)for UNOCAL <br /> Corporation(UNOCAL)at the site referenced above(Figure 1). The most recent <br /> 4��} groundwater monitoring event was conducted on November 6, 1991,and included <br /> i <br /> the collection of hroundwater elevation data and the sampling of groundwater <br /> from site monitoring wells for laboratory analysis. A brief description of additional j <br /> investiLyation to be conducted at the site is also included. <br /> I <br /> Site Conditions <br /> 1 <br /> The site is an operating UNOCAL bulk plant with two 19,500-gallon and <br /> storage tanks located in the western portion of the <br /> two 20,400-gallon above-ground <br /> property(Figure 2). The 19,500-gallon tanks contain diesel and super unleaded 3 <br /> gasoline,and the 20,000-gallon tanks contain regular leaded gasoline and unleaded <br /> gasoline. There is one water-supply well located on-site. This well is <br /> ! approximately 80 feet deep based on information from site personnel. This well <br /> was sampled during November 1990, and did not contain detectable <br /> E concentrations of total petroleum hydrocarbons calculated as gasoline(TPH- <br /> gasoline), total semi-and non-volatile hydrocarbons calculated as diesel(TPH- <br /> diesel),and benzene, toluene,ethylbenzene,and xylenes(BTEX compounds). I <br /> 1 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 /> I101 Civic Critter I)rtle,jn,le_'U?.S.Inta r-lar.t,C,Ilirnrni,t 11;050 !4081'M-34,3111 FAX: 14081_41-331 I <br /> _. <br /> 620('Or1Ef1Cr�i.l IiuUlel.u[l.Shite.2110,Vie,i,oni Hill.(..Illiomi,3'14 i2.1 IS 1 71 82".08:i _ Fr\X: 141 it H21-0882 - _ - <br />