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HORIZON ENVIRONMENTAL INC. <br /> a r Specialists in Site Assessment,Remedial Testing Design and Operation <br /> } �February 18, 2002 <br /> Mr Joe Aldridge <br /> Ultramar Inc <br /> 685 West Third Street <br /> Hanford, California 93230 <br /> Subject Quarterly Groundwater Monitoring Report <br /> Fourth Quarter 2001 <br /> Beacon Station No 3641 <br /> 1210 East Hammer Lane, Stockton, California <br /> Mr Aldridge <br /> Horizon Environmental Inc (Horizon) has prepared this report which documents results of <br /> fourth quarter 2001 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 13 December 2001 according to Ultramar Field Procedures (Attachment A ) <br /> Monitoring activities included measurement of static groundwater level, purging <br /> groundwater from the wells, collection of groundwater samples, and preparation and <br /> delivery of the samples to the analytical Iaboratory Vapor wells VW-2, VW-4, VW-6 and <br /> VW-8 were dry <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-8, sparge well SW-1 and vapor wells VW-1, <br /> V W-3,V W-5 and VW-7 The physical parameters conductivity, pH and temperature of the <br /> groundwater were monitored with field instrumentation during the purging process The <br /> visual characteristics of the groundwater were also noted during the purging process Field <br /> groundwater level and purge data were recorded on the Doulos Groundwater Level Data <br /> and Sampling Information Sheets (Attachment B) <br /> Groundwater samples were collected from all eight monitoring wells, the sparge well and <br /> four vapor wells The groundwater samples were submitted, under chain-of-custody <br /> documentation, to Kiff Analytical (Kiff), a California-certified analytical laboratory (ELAP <br /> .� No 2236) located in Davis, California The groundwater samples were analyzed for total <br /> 5011 Golden Foothill Parkway Suite 7 • EI Dorado Fulls CA 95762 . (916) 939-2170 . FAX (916) 939-2172 <br /> PO Box 5283 Bakersfield CA 93388 (661) 589-8389 • FAX (661) 589-1456 <br />