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HORIZON ENVIRONMENTAL INC. <br /> v <br /> Specialists in Site Assessment,Remedial Testing Design and Operation <br /> January 26, 2006 <br /> Mr Steve Coodey <br /> Ultramar Inc <br /> 685 West Third Street <br /> Hanford, California 93230 <br /> Subject Quarterly Groundwater Monitoring Report <br /> Fourth 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 fourth <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 spurge 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 monituiing piograrn is coniamed in Attachrneiit .y <br /> Groundwater Monitoring <br /> • Groundwater monitoring activities were conducted by Horizon on December 12 2005 <br /> according to Hoiizon 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 Froin the top-of-casing <br /> (TOC) in monitoring wells MW-I through MW-I1 and air sparge wells AS-1 through AS-3 <br /> I he groundwater physical parameters of conductivity, pH and temperature 1&ere monitored <br /> with field instrumentation and the visual characteristics of turbidity and presence of free <br /> product or sheen, and obvious olfactory characteristics of the groundwater were noted during <br /> the purging process Field groundwater level and purge data are recorded on Horizon <br /> Monitoring Well Data sheets (Attachment B) <br /> Groundwater samples were collected from monitoring wells MW-6, MW-8, MW-9 and 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 /> toluene, ethylbenzene and total xylenes (BTEX), and the fuel oxygenate methyl-t-butyl ether <br /> (MTBE) by EnNironmental Protection Agency (EPA) Method 8260B <br /> 4970 Windplay Drive #C5 - 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 />