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KAPREALIAN ENGINEERING, INC. <br /> �( Consulting Engineers <br /> P.O. BOX 996 • BENICIA, CA 94510 <br /> (707) 746-6915 • (707) 746-6916 • FAX: (707) 746-5581 <br /> KEI-P89-1104 .QR4 <br /> February 3 , 1992 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P.O. Box 5155 <br /> San Ramon, California 94583 <br /> 1 <br /> Attention: Mr. Bob Boust <br /> RE: Quarterly Report <br /> Unocal Service Station #5421 <br /> 7303 Pacific Avenue EWRONNNZINTALHF-ALTH <br /> Stockton, California PESp�11T/SFUICES <br /> Dear Mr. Boust: <br /> This report presents the results of the fourth quarter of monitor- <br /> ing and sampling of the monitoring wells at the referenced site by <br /> Kaprealian Engineering, Inc. (KEI) , per KEI ' s proposal KEI-P89- <br /> 1104 .P5 dated December 10, 1990. The wells are currently monitored <br /> monthly and are sampled on a quarterly basis. This report covers <br /> the work performed by KEI from October through December, 1991. <br /> SITE DESCRIPTION AND BACKGROUND <br /> The subject service station site occupies the northwest corner at <br /> the intersection of Pacific Avenue and Willora in Stockton, <br /> California. The vicinity of the site is developed with residential <br /> and light commercial structures. The site is characterized by <br /> topography that slopes very gently toward the southwest, and the <br /> site is located approximately 1, 000 feet southeast of Five Mile <br /> Creek. A Location Map and Site Plans are attached to this report. <br /> KEI 's initial field work was conducted on November 17, 1989, when <br /> three underground fuel storage tanks were removed from the site. <br /> The tanks consisted of one 10, 000 gallon super unleaded gasoline <br /> storage tank, one 10, 000 gallon regular unleaded gasoline storage <br /> tank, and one 280 gallon waste oil tank. The tanks were made of <br /> steel and no apparent holes or cracks were observed in any of the <br /> tanks. Ms. Kasey Foley of San Joaquin County Public Health <br /> Services (SJCPHS) and Mr. Ron Hiltscher of the City of Stockton <br /> Fire Department were present during tank removal. Ms. Foley was <br /> also present during subsequent soil sampling. <br /> Four soil samples, labeled Al, A2, B1, and B2 , were collected from <br /> beneath the fuel tanks at depths of 15.5 to 16. 5 feet below grade. <br /> One soil sample, labeled WO1, was collected from the soil beneath <br />