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' HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment Remedial Testing Design and Operation <br /> 'E <br /> November 2, 2005 COWELD <br /> Mr Rob Fishburn NOV — 4 2005 <br /> Ultramar Inc EWRONMENT HEALTH <br /> 685 West Third Street PERMITIS FMCES <br /> Hanford, California 93230 <br /> Subject Quarterly Groundwater Monitoring 1 Remediation Status Report <br /> Third Quarter 2005 <br /> Former Beacon Station No 12474 <br /> 3440 East Main Street, Stockton, California <br /> Mr Fishburn <br /> Horizon Environmental Inc (Horizon) has prepared this report which documents third <br /> quarter 2005 groundwater monitoring and remediation at the subject site located in San <br /> Joaquin County, as shown on Figure 1 There are currently 17 groundwater monitoring <br /> wells (MW-1 through MW-17), seven vapor extraction wells (VW-1 through VW-7), and <br /> one air-sparge well (AS-1) associated with this site All of the wells are located on site, <br /> except for monitoring wells MW-4 and MW-5, which are located in the East Main Street <br /> and Broadway right-of-ways north of the site as shown on Figure 2 A table summarizing <br /> the quarterly groundwater monitoring program is contained in Attachment A <br /> i� Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on May Septembei 1 and 2, <br /> 2005 according to Horizon Field Methods and Procedures (Attachment A) Monitoring <br /> activities included measurement of static groundwater level, purging groundwater from the <br /> wells, collection of groundwater samples, and preparation and delivery of the samples to the <br /> 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-17, AS-1, VW-1 and VW-4 The physical <br /> parameters conductivity, pH and temperature were monitored with field instrumentation <br /> during the purging process The visual characteristics of turbidity, the presence of free <br /> product or sheen, and the obvious olfactory characteristics of the groundwater were also <br /> noted during the purging process Field groundwater monitoring well purge data were <br /> recorded on Horizon Monitoring Well Data sheets (Attachment B) <br /> Groundwater samples were collected from wells MW-4 through MW-17, AS-1, VW-1 and <br /> VW-4 The samples were submitted, under chain-of-custody documentation, to Kiff <br /> Analytical LLC (Kiff), a California Department of Health Services-certified analytical - <br /> laboratory (FLAP No 2236) located in Davis, California The samples were analyzed for <br /> total petroleum hydrocarbons as gasoline (TPHg), the volatile aromatic compounds benzene, <br /> toluene, ethylbenzene and total xylenes (BTEX), and the fuel oxygenate methyl-t-butyl ether <br /> • (MTBE) by Environmental Protection Agency (EPA) Method 8260B Groundwater samples <br /> 4970 Windplay Drive #C5 - EI Dorado Hills CA 95762 - (916)939-2170 • FAX(916)939-2172 <br /> PO Box 5283 6 Bakersfield CA 93388 - (661)589-8389 - FAX(661)589-1456 <br />