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dl Adff"- <br /> HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment Remedial Testing Design and Operation <br /> July 14 2000 ` ~ <br /> C3 <br /> Mr Joe Aldridge , <br /> Ultramar Inc r <br /> 525 West Third Street JP <br /> Hanford California 93230 <br /> Subject <br /> Quarterly Groundwater Monitoring Report <br /> Second Quarter— 2000 <br /> Beacon Station No 641 <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 second quarter 2000 groundwater monitoring at the subject site (Figure 1) There are <br /> currently eight groundwater monitoring wells (MW-1 through MW-8) eight vapor wells <br /> (VW-1 through VW-8) and one sparge well (SW-1) at the site (Figure 2) All wells are <br /> located on site except for monitoring well MW-2 which is located approximately 40 feet <br /> west of the site The former and current underground storage tank (UST) locations are in the <br /> west central portion of the site <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Doulos Environmental Company <br /> (Doulos) on June 6 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-6 and VW-8 were dry and consequently were not sounded or sampled during <br /> this monitoring event Ultramar Inc (UItramar) Field Procedures are presented as <br /> Attachment 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 top-of-casing <br /> (TOC) in monitoring wells MW-1 throu¢h MW-8 sparge well SWA and vapor "Hells VW-I <br /> VW-3 VW-5 and VW-7 Field groundwater level data were recorded on the Doulos <br /> Groundwater 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 />