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HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment Remedial Testing Design and Operation <br /> • REFJ <br /> October 29, 2002 <br /> Nov zoaz <br /> Mr Joe Aldridge ENVIRONMENI hE ATH <br /> Ultramar Inc PERMIT/SERVICES <br /> 685 West Third Street <br /> Hanford, California 93230 <br /> Subject Quarterly Groundwater Monitoring Report <br /> Third Quarter 2002 <br /> Former Beacon Station No 12419 <br /> 2350 Waterloo Road, Stockton, California <br /> Mr Aldridge <br /> Horizon Environmental Inc (Horizon) has prepared this report which documents third quarter <br /> 2002 groundwater monitoring at the subject site located in San Joaquin County as shown on <br /> Figure i There are currently eleven groundwater monitoring wells (MW-1 through MW-11), <br /> two soil vapor extraction wells (VW-1 and VW-2) and three air-sparge wells (AS-1 through <br /> AS-3) associated with this site The wells, with the exception of well MW-6, are located <br /> within site boundaries (Figure 2) <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on September 12 and 13, 2002 <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 (TOC) <br /> in monitoring wells MW-1 through MW-7, MW-9, MW-10 and air sparge wells AS-1 through <br /> AS-3 Vapor extraction wells VW-1, VW-2 and monitoring wells MW-8 and MW-11 were <br /> dry The groundwater physical parameters of conductivity, pH and temperature were <br /> monitored with field instrumentation and the visual characteristics of turbidity and presence of <br /> free product or sheen, and obvious olfactory characteristics of the groundwater were noted <br /> during the purging process Field groundwater level and purge data are recorded on Horizon <br /> Monitoring Well Data sheets (Attachment B) <br /> Groundwater samples were collected from groundwater monitoring wells MWA through <br /> MW-7, MW-9, MW-10 and air sparge wells AS-1 through AS-3 Groundwater samples were <br /> submitted, under chain-of-custody (COC) documentation, to Kiff Analytical LLC (Kiff), a <br /> California Department of Health Services-certified analytical laboratory (FLAP No 2236) <br /> 5011 Golden Foothill Parkway Suite 7 • EI Dorado Hills CA 95762 • (916) 939-2170 • FAX (916) 939-2172 <br /> P 0 Box 5283 9 Bakersfield CA 93388 • (661) 589-8389 . FAX (661) 589-1456 <br />