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HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment, Remedial Testing,Design and Operation <br /> o �rr <br /> s� <br /> r. <br /> October 26, 2005 <br /> Mr. Rob Fishburn <br /> Ultramar Inc. <br /> 685 West Third Street <br /> Hanford, California 93230 <br /> Subject: Quarterly Groundwater Monitoring/Remediation System Report <br /> Third Quarter 2005 <br /> Beacon Station No. 3641 <br /> 1210 East Hammer Lane, Stockton, California <br /> Mr. Fishburn: <br /> Horizon Environmental Inc. (Horizon) has prepared this Quarterly Groundwater Monitoring j <br /> Report/Remediation System Report which presents results for the third quarter at the subject <br /> site located in San Joaquin County as shown on Figure 1. There are twelve groundwater <br /> monitoring wells (MW-1 through MW-7 and MW-9 through MW-13), eight vapor wells <br /> (VW-1 through VW-8) and one sparge well (SW-1) associated with the site (Figure 2). The <br /> off-site monitoring well MW-8 was destroyed in April 2003. Monitoring wells MW-9 <br /> ' through MW-13 were installed during fourth quarter 2004 and are included in the quarterly <br /> monitoring program starting second quarter 2005. The wells are sampled according to the <br /> program contained in Attachment A. <br /> Horizon conducts operation and maintenance activities at the site for vapor extraction and air <br /> sparge systems. Operation of the remediation systems was initiated in March 2005. <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Doulos Environmental Company <br /> (Doulos) on August 29, 2005 according to Ultramar Field Procedures (Attachment A). <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. <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-7, MW-9 through MW-13, sparge well SW-1 <br /> and vapor wells VW-3 and VW-7. Vapor wells VW-1, VW-2, VW-4, VW-5, VW-6 and VW- <br /> 8 were dry. The physical parameters conductivity, pH and temperature of the groundwater <br /> were monitored with field instrumentation during the purging process. The visual <br /> characteristics of the groundwater were also noted during the purging process. Field k <br /> groundwater level and purge data were recorded on the Doulos Groundwater Level Data and k <br /> Sampling Information Sheets (Attachment B). E <br /> F <br /> 4970 Windplay Drive,#C5 • 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 />