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y, <br /> HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment Remedial Testing Design and Operation <br /> January 18, 2005 <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 2004 <br /> Abdelwahed Facility <br /> Ultramar No 13792 <br /> 2255 South Airport Way, Stockton, California <br /> Mr Aldridge <br /> Horizon Environmental Inc (Horizon) has prepared this report which documents results of <br /> fourth quarter 2004 groundwater monitoring at the subject site located in San Joaquin County <br /> as shown on Figure 1 There are four groundwater monitoring wells (MW-1 through MW-4) <br /> associated with the site (Figure 2) <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on December 10, 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 MWA through MW-4 The physical parameters conductivity, pH <br /> and temperature of the groundwater were monitored with field instrumentation during the <br /> purging process The visual characteristics of the groundwater were also noted during the <br /> purging process Field groundwater level and purge data were recorded on Horizon <br /> Monitoring Well Data Sheets (Attachment B) <br /> Groundwater samples were collected from the monitoring wells MW-I through MW-4 The <br /> groundwater samples were submitted, under chain-of-custody documentation, to Kiff <br /> Analytical (Kiff), a California-certified analytical laboratory (FLAP No 2236) located in <br /> Davis, California and were analyzed for total petroleum hydrocarbons as diesel (TPHd) by <br /> modified Environmental Protection Agency (EPA) Method 8015 and for total petroleum <br /> hydrocarbons as gasoline (TPHg), the volatile aromatic compounds benzene, toluene, <br /> ethylbenzene and total xylenes (BTEX), 1,2-dichloroethane (DCA) and 1,2-dibromoethane <br /> • (EDB) by 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 />