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HORIZON ENVIRONMENTAL INC. <br /> * W Specialists in Site Assessment,Remedial Testing, Design and Operation <br /> October 14, 2004 <br /> Mr. Rob Fishburn <br /> Ultramar Inc. <br /> 685 West Third Street <br /> Hanford, California 93230 <br /> Subject: Quarterly Groundwater Monitoring Report <br /> Third Quarter 2004 <br /> Former Beacon Station No. 12474 <br /> 3440 East Main Street, Stockton, California <br /> Mr. Fishburn: <br /> Horizon Environmental Inc. (Horizon) has prepared this report which documents third <br /> quarter 2004 groundwater monitoring at the subject site located in San Joaquin County, as <br /> shown on Figure 1. There are currently 17 groundwater monitoring wells (MW-1 through <br /> MW-17), seven vapor extraction wells (VW-1 through VW-7), and one air-sparge well <br /> (AS-1) associated with this site. All of the wells are located on site, except for monitoring <br /> wells MW-4 and MW-5, which are located in the East Main Street and Broadway right-of- <br /> ways north of the site as shown on Figure 2. Monitoring wells MW-13 through MW-17 <br /> were installed in February 2004. A table summarizing the quarterly groundwater monitoring <br /> program is contained in Attachment A. <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on September 8 and 9, 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 MW-1 through MW-17, vapor extraction wells VW-I and VW- <br /> 4, and air-sparge well AS-1. The physical parameters conductivity, pH and temperature <br /> were monitored with field instrumentation during the purging process. The visual <br /> characteristics of turbidity, the presence of free product or sheen, and the obvious olfactory <br /> characteristics of the groundwater were also noted during the purging process. Field <br /> groundwater monitoring well purge data were recorded on Horizon Monitoring Well Data j <br /> sheets (Attachment B). <br /> Groundwater samples were collected from groundwater monitoring wells MW-4 through <br /> MW-11, MW-13 through MW-17, AS-1, VW-1 and VW-4. The samples were submitted, <br /> 5011 Golden Foothill Parkway, Suite 7 • EI Dorado Hills, CA 95762 . (916) 939-2170 • FAX (916) 939-2172 <br /> P.O. Box 5283 • Bakersfield, CA 93388 • (661) 589-8389 • FAX (661) 589-1456 <br />