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IDoar keD <br /> EN 1 02006 <br /> 1 an ARCADIS company 6441gi6 R�,�EALry <br /> eFs <br /> 1 <br /> Transmitted Via Federal Express <br /> 1 September 29, 2006 <br /> James L L Barton,P G <br /> 1 Engineering Geologist <br /> Regional Water Quality Control Board <br /> 1 Central Valley Region <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, California 95670 <br /> 1 Re Third Quarter 2006 Groundwater Monitoring Report <br /> Chevron Facility 9-6171 <br /> 6633 Pacific Avenue <br />' Stockton,California <br /> BBL Project# 44646 002 #10 <br />' Dear Mr Barton <br /> 5 <br /> This Third Quarter 2006 Groundwater Monitoring Report has been prepared by Blasland, Bouck& Lee, <br /> Inc , an ARCADIS company (BBL) for Chevron Service Station 9-6171 located at 6633 Pacific Avenue <br /> in Stockton, California Quarterly groundwater monitonng and sampling was conducted on site on July <br /> 19, 2006 by Gettler-Ryan Inc (G-R) on behalf of Chevron The groundwater monitoring program <br />' consists of water-level-elevation monitoring, sample collection, and chemical analysis of samples as <br /> described below <br />' Field Procedures <br /> G-R collected water-level measurements from 13 monitoring wells on July 19, 2006 Water-level <br /> measurements were used to calculate the water-table elevation at each well and develop a potentiometric <br />' surface map for the site A groundwater elevation was not calculated for MW-14 because a surveyed top <br /> of well casing reference point is not available for the well These data allowed for subsequent estimation <br /> of the groundwater flow direction <br /> Groundwater samples were subsequently collected from 13 monitoring wells (MW-2, MW-3, MW4, <br /> MW-5, MW-6, MW-7,MW-8, MW-9, MW-10, MW-11D, MW-12, MW-13, and MW-14) Groundwater <br />' samples were collected in accordance with California Environmental Protection Agency (CalEPA) <br /> procedures outlined in Representative Sampling of Groundwater for Hazardous Substances (CalEPA, <br /> 1995) <br />' A three-well-volume purging and sample technique using a decontaminated stack pump and/or disposable <br /> bailers was used for groundwater purging and sample collection from monitoring wells with the exception <br /> of monitoring wells MW-8 and MW-9 Due to the minimal amount of water in MW-8 and MW-9, the <br /> 047603054 doc <br /> 10470 Old Placerville Road•Suite 110•Sacramento,CA 95827 <br /> Tel(916)857-0124• Fax(916)857-1965*www bbl-mc com 9 Offices Nationwide <br />