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' HORIZON ENVIRONMENTAL INC. <br /> t Specialists in Site Assessment Remedial Testing Design and Operation <br /> June 29, 2005 <br /> Mr Steve Coodey <br /> Ultramar Inc <br /> 685 West Third Street <br /> Hanford, California 93230 <br /> Subject Quarterly Groundwater Monitoring Report <br /> Second Quarter 2005 <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 second <br /> quarter 2005 groundwater monitoring at the subject site located in San Joaquin County, as <br /> shown on Figure 1 There are currently eleven groundwater monitoring wells (MW-1 through <br /> MW-11), two soil vapor extraction wells (VW-1 and VW-2), and three air sparge wells (AS-1 <br /> through AS-3) associated with this site The wells, with the exception of monitoring well <br /> MW-6, are all located within the station property boundaries (Figure 2) A table summarizing <br /> the quarterly groundwater monitoring program is contained in Attachment A <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on May 24, 2005 according to <br /> Horizon Field Methods and Procedures (Attachment A) Monitoring activities included <br /> measurement of static groundwater level, purging groundwater from the wells, collection of <br /> groundwater samples, and preparation and delivery of the samples to the 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 MWA 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 tree 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-6 and MW-8 through MW- <br /> 10 The groundwater samples were submitted, under chain-of-custody (COC) documentation, <br /> to Kiff Analytical LLC (Kiff), a California Department of Health Services-certified analytical <br /> laboratory (ELAP No 2236) located in Davis, California The samples were analyzed for <br /> . total petroleum hydrocarbons as gasoline (TPHg), the volatile aromatic compounds benzene, <br /> 4970 Windplay Drive #C5 - El 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 />