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HORIZON ENVIRONMENTAL INC. <br /> Specialists In Site Assessment,Remedial Testing,Design and Operation <br /> November 14, 2000 <br /> Mr. Joe Aldridge ` <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> Subject: Quarterly Groundwater Monitoring Report <br /> Third Quarter 2000 <br /> Beacon Station No. 12474 <br /> 3440 East Main Street, Stockton, California <br /> Mr. Aldridge: <br /> Horizon Environmental Inc. (Horizon) has prepared this Quarterly Groundwater Monitoring <br /> Report documenting the results of the third quarter 2000 groundwater monitoring at the <br /> subject site located in San Joaquin County as shown on Figure 1. There are currently 12 <br /> groundwater monitoring wells (MW-1 through MW-12), and seven vapor extraction wells <br /> (VW-1 through VW-7) associated with this site. All of the wells are located on site, except <br /> for wells MW-4 and MW-5, which are located in nearby street right-of-ways (Figure 2). <br /> • Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on 28 September 2000. <br /> Monitoring activities included measurement of static groundwater level, purging <br /> groundwater from the wells, collection of groundwater samples, and preparation and <br /> delivery of the samples to the analytical laboratory. Horizon Field Methods and Procedures <br /> are presented as Attachment A to this report. <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-12 and air-sparge well AS-1. Field <br /> groundwater level data are included on Horizon Monitoring Well Data sheets (Attachment <br /> B) and are summarized in Table 1. <br /> Field groundwater monitoring well purge data are included on Horizon Monitoring Well <br /> Data sheets. The physical parameters conductivity, pH and temperature were monitored <br /> with field instrumentation during the purging process. The visual characteristics of turbidity <br /> and presence of free product or sheen, and the obvious olfactory characteristics of the <br /> groundwater were also noted during the purging process. <br /> Groundwater samples were collected from groundwater monitoring wells MW-1 through <br /> MW-12 and air-sparge well AS-1. Groundwater samples were submitted, under chain-of- <br /> custody documentation, to Kiff Analytical LLC (Kiff), a California Department of Health <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 />