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HORIZON ENVIRONMENTAL INC. q� Specialists in Site Assessment Remedial Testing Design and Operation � January 17, 2005 JAN 2 0 2005 Mr Rob Fishburn ENVIRONMENT HEALTH Ultramar Inc PERMIT/SERVICES 685 West Third Street Hanford, California 93230 Subject Quarterly Groundwater Monitoring Report Fourth Quarter 2004 Former Beacon Station No 12474 LoP 3440 East Main Street, Stockton, California Mr Fishburn Horizon Environmental Inc (Horizon) has prepared this report which documents fourth quarter 2004 groundwater monitoring at the subject site located in San Joaquin County, as shown on Figure 1 There are currently 17 groundwater monitoring wells (MW-1 through I MW-17), seven vapor extraction wells (VW-1 through VW-7), and one air-sparge well (AS-1) associated with this site All of the wells are located on site, except for monitoring • wells MW-4 and MW-5, which are located in the East Main Street and Broadway right-of- ways north of the site as shown on Figure 2 A table summarizing the quarterly groundwater monitoring program is contained in Attachment A Groundwater Monitoring Groundwater monitoring activities were conducted by Horizon on December 8 and 9, 2004 according to Horizon Field Methods and Procedures (Attachment A) Monitoring activities included measurement of static groundwater level, purging groundwater from the wells, collection of groundwater samples, and preparation and delivery of the samples to the analytical laboratory The depth to groundwater was measured to the nearest 0 01 foot from the top-of-casing (TQC) in monitoring wells MW-1 through MW-17, vapor extraction wells VW-1 and VW- 4, and air-sparge well AS-1 The physical parameters conductivity, pH and temperature were monitored with field instrumentation during the purging process The visual characteristics of turbidity, the presence of free product or sheen, and the obvious olfactory characteristics of the groundwater were also noted during the purging process Field groundwater monitoring well purge data were recorded on Horizon Monitoring Well Data sheets (Attachment B) Groundwater samples were collected from groundwater monitoring wells MW-7, MW-8, MW-10, MW-11, MW-13 through MW-17 and VW-1 The samples were submitted, under chain-of-custody documentation, to Kiff Analytical LLC (Kiff), a California Department of 4970 Windplay Drive #C5 • Fl Dorado Hills CA 95762 • (916)939-2170 • FAX(916)939-2172 PO Box 5283 • Bakersfield CA 93388 • (661)589-8389 • FAX(661)589-1456