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HORIZON ENVIRONMENTAL INC. <br /> � + +� Specialists in Site Assessment,Remedial Testing Design and Operation <br /> • December 5, 2000 —, <br /> d <br /> Mr Mike Karvelot N <br /> Quik Stop Markets Inc <br /> 4567 Enterprise Street <br /> Fremont, California 94538 <br /> Subject Quarterly Groundwater Monitoring Report <br /> Fourth Quarter 2000 <br /> Quik Stop Station No 39 <br /> 2285 East Fremont Street, Stockton, California <br /> Mr Karvelot <br /> Horizon Environmental Inc (Horizon) has prepared this quarterly monitoring report <br /> documenting the fourth quarter 2000 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 November 2, 2000 <br /> Monitoring activities included measurement of static groundwater level, purging groundwater <br /> from the wells, collection of groundwater samples, disposal of purge water, and preparation <br /> and delivery of the samples to the analytical laboratory Horizon Field Methods and <br /> Procedures are presented as Attachment A to this report <br /> The depth to groundwater was measured to the nearest 0 01 foot from the top-of-casing (TOC) <br /> in monitoring wells MW-1 through MW-3 Field groundwater level data were recorded on <br /> Monitoring Well Data sheets (Attachment B) and are summarized in Table 1 <br /> Field groundwater monitoring well purge data are included on Horizon Monitoring Well Data <br /> sheets The physical parameters conductivity, pH and temperature were monitored with field <br /> instrumentation during the purging process The visual characteristics of turbidity and <br /> presence of free product or sheen, and the obvious olfactory characteristics of the groundwater <br /> were also noted during the purging process <br /> Groundwater samples were collected from groundwater monitoring wells MW-1 through <br /> MW-3 Groundwater samples were submitted, under chain-of-custody (COC) documentation, <br /> to Kiff Analytical LLC (Kiff), a California Department of Health Services-certified analytical <br /> laboratory (ELAP 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 seven fuel oxygenates methyl-tert- <br /> 5011 Golden Foothill Parkway Suite 7 - EI Dorado Hills CA 95762 * (916) 939-2170 * FAX (916) 939-2172 <br /> P 0 Box 5283 * Bakersfield CA 93388 * (661) 589-8389 * FAX (661) 589-1456 <br />