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- HORIZON ENVIRONMENTAL INC. <br /> SP&Qialists in Site Assessment,Remedial Testing,Design and Operation <br /> August 4, 2003 <br /> Mr. Joe Aldridge <br /> Ultramar Inc. <br /> 685 West Third Street <br /> Hanford, California 93230 <br /> Subject: Quarterly Groundwater Monitoring Report <br /> Second Quarter 2003 <br /> Beacon Station No. 12474 <br /> 3440 East Main Street, Stockton, California <br /> Mr. Aldridge: <br /> Horizon Environmental Inc. (Horizon) has prepared this report which documents second <br /> quarter 2003 groundwater monitoring at the subject site Iocated in San'Joaquin County, as <br /> shown on Figure I. There are currently 12 groundwater monitoring wells (MW-I through <br /> MW-12), 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 onsite, 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 (Figure 2). <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on June 3 and 4, 2003 <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-12, vapor extraction wells VW-1 and <br /> VW-4, and air-sparge well AS-1. Vapor extraction wells VW-2, VW-3, VW-4, VW-5 and <br /> VW-7 were dry. The physical parameters, conductivity, pH and temperature were monitored <br /> with field instrumentation during the purging process. The visual characteristics of turbidity, <br /> the presence of free product or sheen, and the obvious olfactory characteristics of the <br /> groundwater were also noted during the purging process. Field groundwater monitoring well <br /> purge data are included on Horizon Monitoring Well Data sheets (Attachment B). <br /> Groundwater samples were collected from groundwater monitoring wells MW-1 through <br /> MW-12, vapor extraction wells VW-1 and VW-4, and air-sparge well ASA. The samples <br /> were submitted under chain-of-custody documentation to Kiff Analytical LLC (Kiff), a <br /> California Department of Health Services-certified analytical laboratory (ELAP No. 2236) <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 9 (661) 589-8389 . FAX (661) 589-1456 <br />