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HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment,Remedial Testing, Design and Operation <br /> t <br /> January 17, 2005 <br /> Mr. Rob Fishburn <br /> Ultramar Inc. <br /> 685 West Third Street <br /> Hanford, California 93230 <br /> Subject: Quarterly Groundwater Monitoring Report <br /> Fourth Quarter 2004 <br /> Beacon Station No. 3641 <br /> alo 1210 East Hammer Lane, Stockton, California <br /> Mr. Fishburn: <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 seven groundwater monitoring wells (MW-1 through MW- <br /> 7), eight vapor wells (VW-1 through VW-8) and rine sparge well (SW-1) associated with the <br /> site (Figure 2). The off-site monitoring well MW-8 was destroyed on April 11, 2003 because <br /> of road construction on Hammer Lane. The wells are sampled according to the program <br /> contained in Attachment A.. <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Doulos Environmental Company <br /> (Doulos) on December 16, 2004 according to Ultramar Field 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 0.01 foot from the top-of-casing <br /> (TOC) in monitoring wells MW-1 through MW-7, sparge well SW-1 and vapor wells VW-3 <br /> and VW-7. Vapor wells VW-1, VW-2, VW-4 through VW-6 and VW-8 were dry. The <br /> physical parameters conductivity, pH and temperature of the groundwater were monitored <br /> with field instrumentation during the purging process. The visual characteristics of the <br /> groundwater were also noted during the purging process. Field groundwater level and purge <br /> data were recorded on the Doulos Groundwater Level Data and Sampling Information Sheets <br /> (Attachment B). <br /> Groundwater samples were collected from the wells MW-2, MW-4, MW-6 and VW-7. The <br /> groundwater samples were submitted, under chain-of-custody documentation, to Kiff <br /> ' Analytical (Kiff), a California-certified analytical laboratory (ELAP No. 2236) located in <br /> Davis, California and were analyzed for total petroleum hydrocarbons as gasoline (TPHg), <br /> the volatile aromatic compounds benzene, toluene, ethylbenzene and total xylenes (BTEX), <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 />