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I <br /> I�MB. BL <br /> BLASLAND,BOUCK&LEE INC <br /> englnears solenHsh economkii , <br /> mD <br /> LI-71 <br /> NiA f 12 2006 <br /> Transmuted via Fars,-Class MatlEISVf4�'JP�iVII= T HEA1-T8 <br /> PERMMSERVICES <br /> May 11, 2006 <br /> Ms Victoria McCartney <br /> San Joaquin Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br />' Stockton, CA 95202 �� <br /> ti <br />' Re First Quarter 2006 Groundwater Monitoring Report <br /> Chevron Facility 9-2033 (yZ� <br /> 508 West Charter Way <br /> Stockton, California <br /> BBL Project# 45103 <br /> Dear Ms McCartney <br /> This First Quarter 2006 Groundwater Monitoring Report has been prepared by Blasland, Bouck & Lee, <br /> Inc (BBL), on behalf of Chevron Environmental Management Company (Chevron) for Chevron service <br />' station 9-2033 located at 508 West Charter Way in Stockton, California <br /> Quarterly groundwater monitoring and sampling (M&S) was conducted on February 6, 2006 by Gettler= <br /> Ryan Inc (G-R) M&S is conducted as a,joint event between Chevron service station 9-2033, a British <br /> Petroleum (BP) service station located at 620 West Charter Way, a former Texaco service station located <br /> at 440 West Charter Way, and a former Atlantic Ridgefield Company (ARCO) located at 441 West <br /> Charter Way The groundwater monitoring program consists of water-level-elevation monitoring, sample <br /> collection, and chemical analysis of samples as described below Joint M&S data are not included in this <br /> report <br />' Field Procedures <br /> Water-level measurements were collected on February 6, 2006 from the monitoring well network which <br /> consists of 3 monitoring wells (MW-1 through MW-3) Water-level measurements were used to calculate <br /> the water-table elevation at each well and develop a potentiometric surface map for the site These data <br /> allowed for subsequent estimation of the groundwater flow direction <br /> Groundwater samples were subsequently collected from monitoring wells MW-1 through MW-3 <br /> Groundwater samples were collected in accordance with California Environmental Protection Agency <br /> procedures outlined in Representative Sampling of Groundwater for Hazardous Substances (CalEPA, <br />'+ 1995) <br /> J <br /> J\130C0619-203300161022First Qtr 2006 doc <br /> 2033 North Main Street .Suite 340.Walnut Creek,CA 94596•Duns#14-848-7635 <br /> Tel (925)274-1100•Fax(925)274-1103•www bbl-mc corn.Offices Nationwide <br />