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HORIZON ENVIRONMENTAL INC. <br /> =MOURN="* <br /> Specialists in Site Assessment Remedial Testing Design and Operation <br /> IF <br /> January 29, 2003 <br /> Mr Joe Aldridge <br /> Ultramar Inc <br /> 685 West Third Street <br /> Hanford, California 93230 <br /> Subject Quarterly Groundwater Monitoring Report <br /> Fourth 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 fourth <br /> quarter 2002 groundwater monitoring at the subject site located in San Joaquin County as <br /> shown on figure I There are currently eleven groundwater monitoring wells (MW-i through <br /> MW-I 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 well MW-6, are <br /> located within the station property boundaries (Figure 2) <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on December 4 and 5, 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-10 and air sparge wells AS-1 through AS-3 Vapor <br /> extraction wells VW-1, VW-2 and monitoring well MW-11 were dry The groundwater <br /> physical parameters of conductivity, pH and temperature were monitored with field <br /> instrumentation and the visual characteristics of turbidity and presence of free product or <br /> sheen, and obvious olfactory characteristics of the groundwater were noted during the purging <br /> process Field groundwater level and purge data are recorded on Horizon Monitoring Well <br /> Data sheets (Attachment B) <br /> Groundwater samples were collected from groundwater monitoring wells MW-1 through <br /> MW-10 and air sparge wells AS-1 through AS-3 Groundwater samples were submitted, <br /> under chain-of-custody (COC) documentation, to Kiff Analytical LLC (Kiff), a California <br /> Department of Health Services-certified analytical laboratory (ELAP No 2236) located in <br /> 5011 Golden Foothill Parkway Suite 7 • EI Dorado Hills CA 95762 • (916) 939-2170 • FAX (9T6) 939-2172 <br /> P 0 Box 5283 • Bakersfield, CA 93388 (661) 589-8389 • FAX (661) 589-1456 <br />