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r <br /> HORIZON ENVIRONMENTAL INC. <br /> - Specialists in Site Assessment,Remedial Testing,Design and Operation <br /> May 23, 2001 <br /> Mr. Joe Aldridge <br /> Ultramar Inc. <br /> 685 West Third Street <br /> Hanford, California 93230 <br /> Subject: Quarterly Groundwater Monitoring Report <br /> First Quarter 2001 <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 which documents first quarter 2001 groundwater monitoring at the subject site <br /> located in San Joaquin County as shown on Figure 1. There are currently 12 groundwater <br /> monitoring wells (MW-1 through MW-12), seven vapor extraction wells (VW-1 through <br /> VW-7) and one air sparge well (AS-1) associated with this site. All of the wells are located <br /> . on site, except for monitoring wells MW-4 and MW-5, which are located in street right-of- <br /> ways north of the site (Figure 2). <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on 28 March 2001 according <br /> to 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 <br /> 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 VW- <br /> 4, and air sparge well AS-1. Vapor extraction wells VW-2 and VW-3 and VW-5 through <br /> VW-7 were dry. <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, vapor extraction wells VW-1 and VW-4, and air sparge well AS-1. The samples <br /> 5011 Golden Foothill Parkway, Suite 7 . EI Dorado Hills, CA 95762 • (916) 939-2170 • FAX (916) 939-2172 <br /> P.O. Box 5283 9 Bakersfield, CA 93388 (661) 589-8389 9 FAX (661) 589-1456 <br />