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f <br /> or an ARCADIS company AUG 1 6 2006 <br /> ENVIRONMENT HEAL]H <br /> PERMIT/SERVICES <br />' Transmitted Via First Class Mail i. <br /> August 14,2006 <br /> Ms. Victoria McCartney <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re: Second Quarter 2006 Groundwater Monitoring Report <br /> Former Chevron Facility 9-0557 <br /> 139 South Center Street <br /> Stockton, California <br /> BBL Project#: 44640#10 <br /> Dear Ms. McCartney: <br /> This Second Quarter 2006 Groundwater Monitoring Report has been prepared by Blasland, Bouck& Lee, <br /> Inc, an ARCADIS company (BBL), on behalf of Chevron Environmental Management Company <br /> (Chevron), for former Chevron Service Station 9-0557 located at 139 South Center Street in Stockton, <br /> California. <br /> Groundwater Monitoring and Sampling <br /> Quarterly groundwater monitoring and sampling (M&S) was conducted on June 15, 2006 by <br /> Gettler-Ryan Inc. (G-R). The groundwater monitoring program consists of water-level-elevation <br /> monitoring, sample collection, and chemical analysis of samples as described below. <br /> Field Procedures <br /> G-R collected water-level measurements from 11 wells on June 15, 2006. Water-level measurements <br /> were used to calculate the water-table elevation at each well and develop a potentiometric surface map for <br /> the site. These data allowed for subsequent estimation of the groundwater flow direction. <br /> Groundwater samples were subsequently collected from 11 monitoring wells (MW-3, MW-5 through <br /> MW-8, MW-13, MW-14, MW-15, MW-15D, MW-16, and MW-17). Groundwater samples were <br /> collected in accordance with California Environmental Protection Agency (CaIEPA) procedures outlined <br /> in Representative Sampling of Groundwater for Hazardous Substances(CaIEPA, 1995). <br /> 015603054.d,,c <br /> 10470 Old Placerville Road•Suite 11 o•Sacramento,CA 95827 <br /> Tel(916)857-0124•Fax(916)857-1965.www.bbl-lrlc..com.Offices Nationwide <br />