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I ~ HORIZON ENVIRONMENTAL INC. Specialists in Site Assessment Remedial Testing, Design and Operation • September 10 2001 Mr Joe Aldridge Ultramar Inc 685 West Third Street Hanford, California 93230 Subject Quarterly Groundwater Monitoring Report Second Quarter 2001 Former Beacon Station No 12419 2350 Waterloo Road, Stockton, California I Mr Aldridge Horizon Environmental Inc (Horizon) has prepared this quarterly monitoring report which documents second quarter 2001 monitoring activity at the subject site located in San Joaquin County as shown on Figure 1 There are currently eleven groundwater monitoring wells (MW-1 through MW-11), two soil vapor extraction wells (VW-1 and VW-2) and three air- sparge wells (AS-1 through AS-3) associated with this site The wells, with the exception of well MW-6, are located within site boundaries (Figure 2) • Groundwater Monitoring Groundwater monitoring activities were conducted by Horizon on 26 June 2001 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 (TOC) in monitoring wells MW-1 through MW-11 and air sparge wells AS-1 through AS-3 Vapor extraction wells VW-1 and VW-2 were dry Field groundwater level data are recorded on Horizon Monitoring Well Data sheets (Attachment B) and are summarized in Table 1 Field groundwater monitoring well purge data are recorded on Horizon Monitoring Well Data sheets The physical parameters conductivity, pH and temperature were monitored with field instrumentation during the purging process The visual characteristics of turbidity and presence of free product or sheen, and the obvious olfactory characteristics of the groundwater were also noted during the purging process Groundwater samples were collected from groundwater monitoring wells MW-1 through MW-II and air-sparge wells AS-1 through AS-3 Groundwater samples were submitted, under chain-of-custody (COC) documentation, to Kiff Analytical LLC (Kiff), a California Department of Health Services-certified analytical laboratory (ELAP No 2236) located in 5011 Golden Foothill Parkway, suite 7 • EI Dorado Hills CA 95762 . (916) 939-2170 • FAX (916) 939-2172 PO Box 5283 • Bakersfield CA 93388 • (661) 589-8389 • FAX (661) 589-1456