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1.t I <br /> e <br /> KAPREALIAN ENGINEERING, INC. <br /> K Consulting Engineers <br /> PO BOX 996 • BENICIA, CA 94510 <br /> (707) 746-6915 • (707) 746-6916 • FAX (707) 746-5581 <br /> KEI-P89-1104 .QR1 <br /> April 19, 1991 <br /> Unocal Corporation <br /> P.O. Box 5155 <br /> San Ramon, California 94583 <br /> Attention: Mr. Ron Bock ? <br /> RE: Quarterly Report APR 2 2 <br /> Unocal Service Station #5421 Li14V1rR0N�;1vtIvjRL HEALTH <br /> 7303 Pacific Avenue p�RM1T/SLi?�'ICS <br /> Stockton California <br /> Dear Mr. Bock: <br /> This report presents the results of the first quarter of monitoring <br /> and sampling of the monitoring wells at the referenced site by <br /> Kaprealian Engineering, Inc. (KEI) , per proposal KEI-P89-1104 .P5 <br /> dated December 10, 1990. The wells are currently monitored monthly <br /> and sampled on a quarterly basis. This report covers the work <br /> �1 performed by KEI from January through March, 1993. <br /> 1 SITE DESCRIPTION AND BACKGROUND <br /> The service station site occupies the northwest corner at the <br /> intersection of Pacific Avenue and Willora in Stockton, California. <br /> The vicinity around the site is developed with residential and <br /> light commercial structures. The site is characterized by <br /> topography which slopes very gently toward the southwest and is <br /> located approximately 1, 000 feet southeast of Five Mile Creek. A <br /> Location Map and Site Plans are attached. <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 tank, one <br /> 10, 000 gallon regular unleaded fuel storage tank, and one 280 <br /> gallon waste oil tank. The tanks were made of steel and no <br /> apparent holes or cracks were observed in the tanks. Ms. Kasey <br /> Foley of San Joaquin County Public Health Services (SJCPHS) , and <br /> Mr. Ron Hzltscher of the City of Stockton Fire Department were <br /> present during tank removal. Ms. Kasey Foley was also present <br /> 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. One soil <br /> sample, labeled WO1, was collected from the soil beneath the waste <br /> oil tank at a depth of 9 .5 feet. Sample locations are as shown on <br /> the attached Site Plan, Figure 2 . <br />