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w,. <br /> HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment, Remedial Testing, Design and Operation <br /> December 17, 2003 <br /> Mr. Joe Aldridge <br /> Ultramar Inc. DEC 18 2003 <br /> 685 West Third Street <br /> Hanford, California 93230 ENVIRONMENT HbAI-�H <br /> PERMIT/SERVICES <br /> Subject: Quarterly Groundwater Monitoring Report <br /> Fourth Quarter 2003 <br /> Former Beacon Station No. 12474 <br /> 3440 East Main Street, Stockton, California <br /> Mr. Aldridge: <br /> Horizon Environmental Inc. (Horizon) has prepared this report which documents fourth <br /> quarter 2003 groundwater monitoring at the subject site located in San Joaquin County, as <br /> shown on Figure 1. There are currently 12 groundwater monitoring wells (MW-1 through <br /> MW-12), seven vapor extraction wells (VW-1 through VW-7), and one air-sparge well <br /> (AS-1) associated with this site. All of the wells are located on site, except for monitoring <br /> wells MW-4 and MW-5, which are located in the East Main Street and Broadway right-of- <br /> ways north of the site as shown on Figure 2. <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on November 25, 2003 <br /> according to Horizon Field Methods and Procedures (Attachment A). Monitoring activities <br /> included measurement of static groundwater level, purging groundwater from the wells, <br /> collection of groundwater samples, and preparation and delivery of the samples to the <br /> analytical laboratory. <br /> The depth to groundwater was measured to the nearest 0.01 foot from the top-of-casing <br /> (TOC) in monitoring wells MW-i through MW-12, vapor extraction wells VW-I and VW-3 <br /> through VW-5, and air-sparge well AS-1. Vapor extraction wells VW-2, VW-6 and VW-7 <br /> were dry. The physical parameters conductivity, pH and temperature were monitored with <br /> field instrumentation during the purging process. The visual characteristics of turbidity, the <br /> presence of free product or sheen, and the obvious olfactory characteristics of the <br /> groundwater were also noted during the purging process. Field groundwater monitoring <br /> well purge data were recorded on Horizon Monitoring Well Data sheets (Attachment B). <br /> Groundwater samples were collected from groundwater monitoring wells MW-7, MW-8, <br /> MW-10 and MW-11. The samples were submitted under chain-of-custody documentation to <br /> Kiff Analytical LLC (Kiff), a California Department of Health Services-certified analytical <br /> laboratory (ELAP No. 2236) located in Davis, California. The samples were analyzed for <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 - (661) 589-8389 FAX (661) 589-1456 <br />