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HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment Remedial Testing Design and Operation <br /> January 6 2005 <br /> Mr Steve Coode) <br /> Ultramar Inc <br /> 685 West Third Street <br /> Hanford California 93230 <br /> Subjec.t Quarterly Groundwater Monitoring Report <br /> Fourth Quarter 2004 <br /> Former Beacon Station No 12419 <br /> 2350 Waterloo Road, Stockton, California <br /> Mr Coodey <br /> Horizon Environmental Inc (Horizon) has prepared this report which documents fourth <br /> quarter 2004 groundwater monitoring at the subject site located in San Joaquin County, as <br /> shown on Figure 1 There are currently eleven groundwater monitoring wells (MW-1 through <br /> MW-1 1), two soil vapor extraction wells (VW-1 and VW-2), and three air sparge wells (AS-1 <br /> . through AS-3) associated with this site The wells, with the exception of monitoring well <br /> MW-6, are all located within the station property boundaries (Figure 2) A table summarizing <br /> the quarterly groundwater monitoring program is contained in Attachment A <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on December 10, 2004 <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-1 through MW-10 and air sparge wells AS-1 through AS-3 <br /> Monitoring well MW-i 1 was dry The groundwater physical parameters of conductivity, pH <br /> and temperature were monitored with field instrumentation and the visual characteristics of <br /> turbidity and presence of free product or sheen, and obvious olfactory characteristics of the <br /> groundwater were noted during the purging process Field groundwater level and purge data <br /> are recorded on Horizon Monitoring Well Data sheets (Attachment B) <br /> Groundwater samples were collected from monitoring wells MW-6, MW-9 and MW-10 An <br /> attempt was made to collect a groundwater sample from monitoring well MW-8 but the well <br /> went dry The groundwater samples were submitted, under chain-of-custody (COC) <br /> documentation, to Kxff Analytical LLC (Kiff), a California Department of Health Services- <br /> 4970 Windplay Drive #C5 • EI Dorado Wills CA 95762 • (916)939-2170 • FAX(916)939-2172 <br /> PO Box 5283 • Bakersfield CA 93388 • (661)589-8389 • FAX(661)589-1456 <br />