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HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment Remedial Testing Design and Operation <br /> January 15 , 2002 <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 2001 <br /> Former Beacon Station No 12419 <br /> 2350 Waterloo Road, Stockton, California <br /> Mr Aldridge <br /> Horizon Environmental Inc (Horizon) has prepared this quarterly monitoring report which <br /> documents fourth quarter 2001 monitoring activity at the subject site located in San Joaquin <br /> County as shown on Figure 1 There are currently eleven groundwater monitoring wells <br /> (MW-1 through MW-11), two soil vapor extraction wells (VW-1 and VW-2) and three air- <br /> sparge wells (AS-1 through AS-3) associated with this site The wells, with the exception of <br /> well MW-6, are located within site boundaries (Figure 2) <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on 30 November 2001 <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, visual characteristics of turbidity and presence of free product or sheen, and <br /> obvious olfactory characteristics of the groundwater were noted during the purging process <br /> Field groundwater level and purge data are recorded on Horizon Monitoring Well Data sheets <br /> (Attachment B) and are summarized in Table 1 <br /> Groundwater samples were collected from groundwater monitoring wells MWA 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 (FLAP No 2236) located in <br /> Davis, California The samples were analyzed for total petroleum hydrocarbons as gasoline <br /> 5011 Golden Foothill Parkway Suite 7 • EI Dorado Hills, CA 95762 . (916) 939-2170 • FAX (916) 939-2172 <br /> PO Box 5283 • Bakersfield, CA 93388 (661) 589-8389 • FAX (661) 589-1456 <br />