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HORIZON ENVIRONMENTAL. INC. <br /> Specialists in Site Assessment Remedial Testing Design and Operation <br /> I7U1 E <br /> IIJIl]] <br /> July 29, 2004 AUG 0 3 2004 <br /> ENVIRONMENT HEALTH <br /> Mr Steve Coodey PERMIT/SERVICES <br /> Ultramar Inc <br /> 685 West Third Street <br /> Hanford, California 93230 <br /> Subject Quarterly Groundwater Monitoring Report <br /> Second Quarter 2004 <br /> Former Beacon Station No 12419 <br /> 2350 Waterloo Road, Stockton, California <br /> Mr Aldridge <br /> Horizon Environmental Inc (Horizon) has prepared this report which documents second <br /> quarter 2004 groundwater monitoring at the subject site located in San Joaquin County, as <br /> shown on Figure l There are currently eleven groundwater monitoring wells (MW-1 through <br /> MW-11), two soil vapor extraction wells (VW-I 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 June 7, 2004 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 MW-1 through MW-10 and air sparge wells AS-1 through AS-3 <br /> Monitoring well MWA I 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 free 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, MW-8, MW-9 and MW- <br /> 10 and were submitted under chain-of-custody (COC) documentation to Krff Analytical LLC <br /> (Kiff), a California Department of Health Services-certified analytical laboratory (ELAP No <br />` 2236) located in Davis, California The samples were analyzed for total petroleum <br /> hydrocarbons as gasoline (TPHg), the volatile aromatic compounds benzene, toluene, <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 9 (661) 589-8389 - FAX (661) 589-1456 <br />