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I <br /> i <br /> KAPREALIAN ENGINEERING, INC. <br /> K EjLB Consulting Engineers <br /> PO BOX 996 • BFNICIA, CA 94510 <br /> (707) 746-6915 9 (707) 746-6916 • FAX (707) 746-5581 <br /> KEI-P$9-1104 .QR2 <br /> August 7 , 1991 <br /> Unocal Corporation <br /> P.O. Box 5155 E E I VE D <br /> San Ramon, California 94583 <br /> Attention: Mr. Ron Bock AUG U 9 1991 <br /> ENVIRONMENTAL. HEALTH <br /> RE: Quarterly Report PERMIT/SERVICES <br /> Service Station #5421 <br /> 7303 Pacific Avenue <br /> Stockton California <br /> Dear Mr. Bock: <br /> This report presents the results of the second quarter of monitor- <br /> ing 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 /> performed by KEI from April through June, 1991. <br /> 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 that 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 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 fuel <br /> storage tank, one 10, 000 gallon regular unleaded fuel storage tank, <br /> and one 280 gallon waste oil tank. The tanks were made of steel <br /> and no apparent holes or cracks were observed in the tanks. Ms. <br /> Kasey Foley of San Joaquin County Public Health Services (SJCPHS) , <br /> and Mr. Ron Hiltscher 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 W01, 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 />