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�• HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment,Remedial Testing Design and Operation <br /> March 26, 2002 <br /> Mr Mike Karvelot <br /> Quik Stop Markets Inc <br /> 4567 Enterprise Street <br /> Fremont, California 94538 <br /> Subject Quarterly Groundwater Monitoring Report <br /> First Quarter 2002 <br /> Quik Stop Station No 039 <br /> 2285 East Fremont Street, Stockton, California <br /> Mr Karvelot <br /> Horizon Environmental Inc (Horizon) has prepared this quarterly monitoring report which <br /> documents first quarter 2002 groundwater monitoring at the subject site located in San <br /> Joaquin County as shown on Figure 1 There are currently three groundwater monitoring <br /> wells (MW-I through MW-3) as shown on Figure 2 <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on 18 February 2002 <br /> according to Horizon Field Methods and Procedures (Attachment A) Monitoring activities <br /> included measurement of static groundwater level, purging groundwater from the wells, <br /> collection of groundwater samples, disposal of purge water, and preparation and delivery of <br /> the samples to the analytical laboratory <br /> The depth to groundwater was measured to the nearest 0 01 foot from the top-of-casing (TQC) <br /> in monitoring wells MW-1 through MW-3 The groundwater physical parameters <br /> conductivity, pH and temperature were monitored with field instrumentation during the <br /> purging process The visual characteristics of turbidity and presence of free product or sheen <br /> if any, and the obvious olfactory characteristics of the groundwater were also noted during the <br /> purging process Field groundwater level and purge data were recorded on Monitoring Well <br /> Data sheets (Attachment B) <br /> Groundwater samples were collected from groundwater monitoring wells MW-1 through <br /> MW-3 and were submitted, under chain-of-custody (COC) documentation, to Kiff Analytical <br /> LLC (Kiff), a California Department of Health Services-certified analytical laboratory (FLAP <br /> No 2236) located in Davis, California The samples were analyzed for total petroleum <br /> hydrocarbons as motor oil (TPHm) by modified Environmental Protection Agency (EPA) <br /> Method 8015, total petroleum hydrocarbon as gasoline (TPHg), the volatile aromatic <br /> • compounds benzene, toluene, ethylbenzene and total xylenes (BTEX) and the seven fuel <br /> oxygenates methyl-tert-butyl ether (MTBE), diisopropyl ether (DIPS), ethyl-t-butyl ether <br /> 5011 Golden Foothill Parkway Suite 7 - FI 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 />