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ra <br /> AIM HORIZON ENVIRONMENTAL. INC. <br /> Specialists in Site Assessment Remedial Testing Design and Operation <br /> June 20, 2000 r <br /> Mr Joe Aldridge <br /> Ultramar Inc i <br /> 525 West Third Street C� <br /> Hanford, Califortua 93230 <br /> Subject Quarterly Groundwater Monitoring Report <br /> Second Quarter— 2000 <br /> Former Beacon Station No 419 <br /> 2350 Waterloo Road, Stockton, California <br /> Mr Aldridge <br /> Horizon Environmental Inc (Horizon) has prepared this Quarterly Groundwater Monitoring <br /> Report for the second quarter 2000 monitoring activity at the subject site (Figure 1) There <br /> are currently ten groundwater monitoring wells (MW-1 through MW-10), two soil vapor <br /> extraction wells (VW-1 and VW-2) and one air-sparging well (AS-1) associated with this <br /> site The wells, with the exception of well MW-6, are located within site boundaries (Figure <br /> 2) <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on May 18, 2000 <br /> Monitoring activities included measurement of static groundwater level, purging groundwater <br /> from the wells, collection of groundwater samples, and preparation and delivery of the <br /> samples to the analytical laboratory Horizon Field Methods and Procedures are presented as <br /> 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-10 Field groundwater level data are <br /> included on Horizon Monitoring Well Data sheets (Attachment B) and are summarized in <br /> Table 1 <br /> Field groundwater monitoring well purge data are included on Horizon Mointor ng Well Data <br /> sheets The physical parameters conductivity, pH and temperature were monitored with field <br /> instrumentation during the purging process The visual characteristics of turbidity and <br /> presence of free product or sheen, and the obvious olfactory characteristics of the <br /> groundwater were also noted during the purging process <br /> 5011 Golden Foothill Parkway Suite 7 • El Dorado Hills CA 95762 • (916) 939-2170 • FAX (916) 939-2172 <br /> PO Box 5283 • Bakersfield CA 93388 • (661) 589-8389 • FAX (661) 589-1456 <br />