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- HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment Remedial Testing,Design and Operation <br /> October 22, 2001 <br /> Mr Mike Karvelot <br /> Quik Stop Markets Inc <br /> 4567 Enterprise Street <br /> Fremont, California 94538 <br /> Subject Quarterly Groundwater Monitoring Report <br /> Third Quarter 2001 <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 third quarter 2001 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-1 through MW-3) as shown on Figure 2 <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on 17 September 2001 <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 (TOC) <br /> in monitoring wells MW-i through MW-3 The physical parameters conductivity, pH and <br /> temperature were monitored with field instrumentation during the purging process The <br /> visual characteristics of turbidity and presence of free product or sheen if any, and the obvious <br /> olfactory characteristics of the groundwater were also noted during the purging process Field <br /> groundwater level and purge data were recorded on Monitoring Well Data sheets <br /> (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 (ELAP <br /> No 2236) located in Davis, California The samples were analyzed for total petroleum <br /> hydrocarbons as gasoline (TPHg), the volatile aromatic compounds benzene, toluene, <br /> ethylbenzene and total xylenes (BTEX) and the oxygenate methyl-tert-butyl ether (MTBE) by <br /> Environmental Protection Agency (EPA) Method 8260B <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 />