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��_ HORIZON ENVIR4NMENTAL-INC. <br /> Specialists in Site Assessment Remedial Testing Design and Operation f <br /> October 30, 2000 <br /> Mr Joe Aldridge Og <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 3641 <br /> 1210 East Hammer Lane, Stockton, California <br /> Mr Aldridge <br /> Horizon Environmental Inc (Horizon) has prepared this report documenting the results of <br /> the third quarter 2000 groundwater monitoring at the subject site located in San Joaquin <br /> County as shown on Figure 1 There are currently eight groundwater monitoring wells <br /> (MW-1 through MW-8), eight vapor wells (VW-1 through VW-8) and one sparge well (SW- <br /> 1) at the site (Figure 2) All wells are located on site except for monitoring wells MW-2 and <br /> MW-8 The former and current underground storage tank (UST) locations are in the west <br /> central portion of the site <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Doulos Environmental Company <br /> (Doulos) on September 14, 2000 Monitoring activities included measurement of static <br /> groundwater level, purging groundwater from the wells, collection of groundwater samples, <br /> and preparation and delivery of the samples to the analytical laboratory Vapor wells VW-2, <br /> VW-4, VW-5, VW-6 and VW-8 were dry and, consequently, were not sampled during this <br /> monitoring event Ultramar Inc (Ultramar) Field Procedures are presented as Attachment <br /> A, and Doulos Sampling Information Sheets are included as Attachment B <br /> The depth to groundwater was measured to the nearest 0 01 foot from the tap-of-casing <br /> (TOC) in monitoring wells MW-1 through MW-8, sparge well SW-1 and vapor wells VW-1, <br /> VW-3, and VW-7 Field groundwater level data were recorded on the Doulos Groundwater <br /> Level Data and Sampling Information Sheets, and are summarized in Table 1 <br /> Field groundwater monitoring well purge data are included on Doulos Sampling Information <br /> Sheets The physical parameters conductivity, pH and temperature were monitored with <br /> field instrumentation during the purging process The visual characteristics of the <br /> groundwater were also noted during the purging process <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 - (661) 589-8389 - FAX (661) 589-1456 <br />