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r <br /> KAPREALIAN ENGINEERING <br /> • I N C O R P O R A T E Q <br /> KEI-P89-1.1.04 .R13 <br /> August 11, 1994 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P.O. Box 5155 <br /> San Ramon, California 94583 <br /> Attention: Mr. Edward C. Ralston <br /> RE: Report of Final Destruction <br /> of Domestic Well <br /> Unocal Service Station #5421 <br /> 7303 Pacific Avenue <br /> Stockton , California <br /> Dear Mr. Ralston: <br /> This report documents the completion of the second and final phase <br /> of the destruction of the second on-site domestic well at the <br /> referenced site. The former domestic well, shown on the attached <br /> Figure 1, extended to a total depth of 78 feet below grade. The <br /> • results of the most recent quarter of monitoring and sampling of <br /> the monitoring wells at the site are included in MPDS Services, <br /> Ines. Quarterly Data Report (MPDS-UN5421-02) dated July 21, 1994 . <br /> BACKGROUND <br /> During the initial phase of the septic tank removal operations on <br /> July 15, 1992 , a seven-inch, steel-cased, domestic water well was <br /> encountered about 40 feet southwest of monitoring well MW1. On <br /> August 5, 1992 , a representative of Kaprealian Engineering, Inc. <br /> (KEI) was on-site during a downhole video camera survey of this <br /> well. The survey was conducted by Water Well Technology, Inc. of <br /> Rancho Cordova, California. The downhole camera survey indicated <br /> that the total depth of the well was 78 feet below grade and that <br /> the casing extended to 72 feet below grade. Possible perforations <br /> in the casing were observed starting at 42 feet below grade. Based <br /> on KEI ' s previous research at the California Department of Water <br /> Resources for the other domestic well on-site (which was destroyed <br /> on January 24 , 1992) , the well was probably installed prior to <br /> 1951. <br /> A water sample was collected from the second domestic well on <br /> August 21, 1992 . Prior to sampling, the well was purged of four <br /> casing volumes of water using a submersible pump. The water sample <br /> was analyzed at Sequoia Analytical Laboratory in Concord, Califor- <br /> nia, for total petroleum hydrocarbons (TPH) as gasoline by EPA <br /> method 5030/modified 8015, and benzene, toluene, ethylbenzene, and <br /> xylenes by EPA method 8020 . In addition, the sample was analyzed <br /> 2401 Stanwell Drive,Suite 400 <br /> Concord,California 94520 <br /> Tel 510 602 5100 Fax 510 687 0602 <br /> I <br />