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HORIZON ENVIRONMENTAL INC, <br /> Specialists in Site Assessment Remedial Testing Design and Operation <br /> March 30, 2004 A PR 0 2 2004 <br /> ENVIRONMEN) HEALTH <br /> Mr Joe Aldridge PERMIT/SERVICES <br /> Ultramar Inc <br /> 685 West Third Street <br /> Hanford, California 93230 <br /> Subject Quarterly Groundwater Monitoring Report <br /> First Quarter 2004 <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 first quarter <br /> 2004 groundwater monitoring at the subject site located in San Joaquin County, as shown on <br /> Figurel. There are currently eleven groundwater monitoring wells (MW-1 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 /> all located within the station property boundaries (Figure 2) <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on February 23, 24, 27 and <br /> March 1 and 2, 2004 according to Horizon Field Methods and Procedures (Attachment A) <br /> Monitoring activities included measurement of static groundwater level, purging groundwater <br /> from the wells, collection of groundwater samples, and preparation and delivery of the <br /> samples to the analytical laboratory <br /> The depth to groundwater was measured to the nearest 0 O1-foot from the top-of-casing <br /> (TOC) in monitoring wells MW-1 through MW-10 and air sparge wells AS-1 through AS-3 <br /> Monitoring well MW-11 was dry The groundwater physical parameters of conductivity, pH <br /> and temperature were monitored with field instrumentation and the visual characteristics of <br /> turbidity and presence of free product or sheen, and obvious olfactory characteristics of the <br /> groundwater were noted during the purging process Field groundwater level and purge data <br /> are recorded on Horizon Monitoring Well Data sheets (Attachment B) <br /> Groundwater samples were collected from monitoring wells MW-1 through MW-10 and AS-I <br /> through AS-3 and were submitted under chain-of-custody (COC) documentation to Kiff <br /> Analytical LLC (Kiff), a California Department of Health Services-certified analytical <br /> laboratory (FLAP No 2236) located in Davis, California The samples were analyzed for <br /> total petroleum hydrocarbons as gasoline (TPHg), the volatile aromatic compounds benzene, <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 />