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HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment Remedial Testing Design and Operation r,� <br /> May 6, 2004 MAY 0 7 2004 <br /> Mr Joe Aldridge ENVIRONMENT HEALTH <br /> Ultramar Inc PERMIT/SERVICES <br /> 685 West Third Street <br /> Hanford, California 93230 <br /> Subject Quarterly Groundwater Monitoring Report <br /> First Quarter 2004 <br /> Beacon Station No 3641 <br /> 1210 East Hammer Lane, Stockton, California <br /> Mr Aldridge <br /> Horizon Environmental Inc (Horizon) has prepared this report which documents results of <br /> first 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 one 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 <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Doulos Environmental Company <br /> (Doulos) on March 26, 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-1, <br /> VW-3, VW-5 and VW-7 Vapor wells VW-2, VW-4, 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-1 through MW-7, SW-1, VW-1, <br /> VW-3, VW-5 and VW-7 The groundwater samples were submitted, under cham-of-custody <br /> documentation, to Kkff Analytical (Kiff), a California-certified analytical laboratory (ELAP <br /> No 2236) located in Davis, California and were analyzed for total petroleum hydrocarbons as <br /> >� gasoline (TPHg), the volatile aromatic compounds benzene, toluene, ethylbenzene and total <br /> t <br /> 5011 Golden Foothill Parkway, Suite 7 • EI Dorado Hills, CA 95762 • (916) 939-2170 • FAX (916) 939-2172 <br /> P 0 Box 5283 • Bakersfield CA 93388 • (661) 589-8389 • FAX (661) 589-1456 <br />