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5 <br /> HORIZON ENVIRONMENTAL INC. <br /> Specialists to Site Assessment Remedial Testing Design and Operation <br /> MC <br /> FFR — 2 1006 <br /> i <br /> January 26, 2006 ENVIRONMENT HEALTH <br /> Mr Chuck Miller PERMIT/SERVICES <br /> USA Gasoline Corporation <br /> 905 Rancho Conejo Boulevard <br /> Newbury Paik, California 91320 <br /> Subject Quarterly Groundwater Monitoring Report <br /> Fourth Quarter 2005 <br /> USA Gasoline Station #110 <br /> 2132 East Manposa Road, Stockton, California <br /> Mr Miller <br /> Horizon Environmental Inc (Horizon) has prepared this report which documents fourth <br /> quarter 2005 groundwater monitoring at the subject site located in San Joaquin County, as <br /> shown on Figure l There aie currently eight groundwater monitoring wells (MW-1P through <br /> MW-6P, MW-I and MW-2) associated with this site as shown on Figure 2 <br /> Groundwater Monitoring <br /> Gioundwater monitoring acts ities were conducted by Horizon on November ,0, 2005 <br /> according to Horizon Field Methods and Procedures (Attachment A) Monitoring activities <br /> included measurement of static groundwater level, purging groundwatei from the wells, <br /> collection of groundwater samples, and preparation and delivery of the samples to the <br /> analytical laboratory <br /> The depth to groundwater was tneasuied to the nearest 001-foot fiorn the top-of-casing <br /> (TOC) in monitoring wells MW-1P through MW-6P, MW-1 and MW-2 The groundwater <br /> physical parameters of conductivity, pH and temperature were monitored with field <br /> instrumentation and the visual characteristics of turbidity and presence of free product or <br /> sheen, and obvious olfactory characteristics of the groundwater were noted during the purging <br /> process Field groundwater level and purge data are recorded on Horizon Monitoring Well <br /> Data sheets (Attachment B) <br /> Groundwater samples were collected from monitoring wells MW-1 P through MW-6P, MW-I <br /> and MW-2 The groundwater samples were submitted, under chain-of-custody (COC) <br /> documentation, to Kiff Analytical LLC (Kiff), a California Department of Health Services- <br /> certified analytical laboratory (ELAP No 2236) located in Davis, California The samples <br /> were analyzed for total petroleum hydrocarbons as gasoline (TPHg), the volatile aromatic <br /> compounds benzene, toluene, ethylbenzene and total xylenes (BTEX), the five fuel <br /> oxygenates methyl tert-t-butyl ether (MTBE), diisopropyl ether (DIPS), ethyl tertiary-t-butyl <br /> ether (ETBE), tert-amyl methyl ether (TAME), tert-butanol (TBA) and 1,2-dichloroethane <br /> (DCA) and 1,2-dibromoethane (EDB) by Environmental Protection Agency (EPA) Method <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 />