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Specialists in Site Assessment, Remedial Testing, Design.and Operation <br />February 8, 1999 <br />Mr. Mike Karvelot <br />Quik Stop Markets Inc. <br />4567 Enterprise Street <br />Fremont, California 94538 <br />Subject: Tank Closure Report <br />Quik Stop Station No. 076 <br />1030 South Olive Avenue, Stockton, California <br />Mr. Karvelot: <br />As requested, Horizon Environmental Inc. (Horizon) conducted soil sampling activities and <br />environmental oversight related to underground storage tank (UST) removal operations at <br />the above -referenced site (see Figure 1). Tasks included being present on the site to observe <br />removal of the existing USTs, collecting native soil samples as required by the San Joaquin <br />County Public Health Services/Environmental Health Division (SJCPHS/EHD), submitting <br />soil samples to a State -certified laboratory for the requested analyses, and the preparation of <br />this Tank Closure Report. <br />The purpose of the investigation was to evaluate for the presence of possible gasoline fuel <br />hydrocarbons in the soil during UST removal activities. Environmental field work was <br />conducted on October 29, 1998 utilizing Horizon Field Methods and Procedures (included as <br />Attachment A), and in accordance with the Horizon Site Safety Plan dated October 26, 1998. <br />UST removal and soil excavation were performed by Walton Engineering (Walton) of West <br />Sacramento, California. <br />UST Removal and SamDling Activities <br />The location of the Quik Stop market building, two former USTs, former dispenser island, <br />and other pertinent site features are shown on the Site Plan (Figure 2). USTs T-1 and T-2 <br />(from west to east), were both of single -walled, steel construction with 10,000 -gallon <br />capacities, and located in the middle area of the station property. Tank T-1 was reportedly <br />used to store unleaded gasoline and tank T-2 was reportedly used to store leaded gasoline. <br />The pump dispenser island was located immediately adjacent to the south ends of the two <br />USTs. On October 29, 1998, Ms. Letitia Briggs of the SJCPHS/EHD and Mr. K. Miller of <br />the City of Stockton Fire Department were onsite to observe the UST removal and transport <br />activities. Upon removal, the USTs appeared to be in very good condition with no <br />5011 Golden Foothill Parkway, Suite 7 • EI Dorado Hills, CA 95762 • (916) 939-2170 • FAX (916) 939-2172 <br />P.O. Box 5283 • Bakersfield, CA 93388 9 (805) 589-8389 9 FAX (805) 589-1456 <br />