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HORIZON ENVIRONMENTAL INC. <br /> u Specialists to Site Assessment Remedial Testing Design and Operation <br /> October 21, 2004 OCT 2 9 2004 <br /> EIVII ';7 <br /> Mr Steve Coodey P;- <br /> Ultramar <br /> Ultramar Inc y <br /> 685 West Third Street <br /> Hanford, California 93230 <br /> Subject Quarterly Groundwater Monitoring Report <br /> Third 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 third quarter <br /> 2004 groundwater monitoring at the subject site located in San Joaquin County, as shown on <br /> Figure 1 There are currently eleven groundwater monitoring wells (MW-i through MW-11), <br /> two soil vapor extraction wells (VW-1 and VW-2), and three air sparge wells (AS-1 through <br /> AS-3) associated with this site The wells, with the exception of monitoring well MW-6, are <br /> 40 all located within the station property boundaries (Figure 2) A table summarizing the <br /> quarterly groundwater monitoring program is contained in Attachment A <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on September 7, 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-7, MW-9, MW-10 and air sparge wells AS-1 <br /> through AS-3 Monitoring wells MW-8 and MW-11 were dry The groundwater physical <br /> parameters of conductivity, pH and temperature were monitored with field instrumentation <br /> and the visual characteristics of turbidity and presence of free product or sheen, and obvious <br /> olfactory characteristics of the groundwater were noted during the purging process Field <br /> groundwater level and purge data are recorded on Horizon Monitoring Well Data sheets <br /> (Attachment B) <br /> Groundwater samples were collected from monitoring wells MW-6, MW-7, MW-9 and air <br /> sparge wells AS-2 and AS-3 and were submitted, under chain-of-custody (COC) <br /> documentation, to Kiff Analytical LLC (Kiff), a California Department of Health Services- <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 />