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HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment Remedial Testing Design and Operation <br /> September 26, 2006b9sc !1 MED <br /> Mr Mike Karvelot SFPZ 8 2006 <br /> Quik Stop Markets Inc EIVORO <br /> NTq <br /> 4567 Enterprise Street PERM! �ALry <br /> Fremont, California 94538 ES <br /> Subject Quarterly Groundwater Monitoring Report <br /> Third Quarter 2006 f v� <br /> Quik Stop Station No 076 <br /> 1030 South Olive Avenue, Stockton, California <br /> Mr Karvelot � 6640 <br /> Horizon Environmental Inc (Horizon) has prepared this report which documents third <br /> quarter 2006 groundwater monitoring at the subject site located in San Joaquin County as <br /> shown on Figure 1 There is currently one groundwater monitoring well (MW-1) at the <br /> site as shown on Figure 2 <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on August 14, 2006 <br /> according to Horizon Field Methods and Procedures (Attachment A) Monitoring <br /> activities included measurement of static groundwater level, purging groundwater from <br /> the well, collection of groundwater samples, disposal of purge water, and preparation and <br /> delivery of the samples to the analytical laboratory <br /> The depth to groundwater was measured to the nearest 0 01 foot from the tap-of-casing <br /> (TOC) in monitoring well MW-1 The groundwater physical parameters conductivity, <br /> pH and temperature were monitored with field instrumentation during the purging <br /> process The visual characteristics of turbidity and presence of free product or sheen if <br /> any, and the obvious olfactory characteristics of the groundwater were also noted during <br /> the purging process Field groundwater level and purge data was recorded a Monitoring <br /> Well Data sheet (Attachment B) <br /> Groundwater was collected from monitoring well MW-1 and was submitted, under chain- <br /> of-custody (COC)documentation, to Kiff Analytical LLC (Kiff), a California Department <br /> of Health Services-certified analytical laboratory (ELAP No 2236) located in Davis, <br /> California The sample was analyzed for total petroleum hydrocarbon as gasoline <br /> (TPHg), the volatile aromatic compounds benzene, toluene, ethylbenzene and total <br /> xylenes (BTEX), the fuel oxygenates methyl-t-butyl ether (MTBE), diisopropyl ether <br /> (DIPS), ethyl-t-butyl ether (ETBE), tert-amyl methyl ether (TAME), tert-butanol (TBA), <br /> and 1,2-dichloroethane (DCA) and 1,2-dibromoethane (EDB) by Environmental <br /> Protection Agency(EPA) Method 8260B <br /> 4970 Windplay Drive #C5 - EI 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 />