Laserfiche WebLink
1 <br /> RECEIVED <br /> I <br /> OBBI MAy 2 2 1006 <br /> BLASLAND 80UCK&LEE INC <br />' "" mists EMnRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Transmitted Via Federal Express <br /> 1 <br /> May 16, 2006 <br />' Mr Jim Barton <br /> Regional Water Quality Control Board <br />' Central Valley Region <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, California 95670 <br /> Re First Quarter 2006 Groundwater Monitoring Report <br /> Chevron Facility 9-6171 <br /> 6633 Pacific Avenue <br /> Stockton, California <br /> BBL Project# 44639 <br /> IDear Mr Barton <br /> This First Quarter 2006 Groundwater Monitoring Report has been prepared by Blasland, Bouck & Lee, <br /> Inc (BBL) for Chevron Service Station 9-6171 located at 6633 Pacific Avenue in Stockton, California <br /> Quarterly groundwater monitoring and sampling was conducted onsite on February 1, 2006 by Gettler- <br /> Ryan Inc (G-R) The groundwater monitoring program consists of water-level-elevation monitoring, <br /> sample collection, and chemical analysis of samples as described below <br /> Field Procedures <br /> Water-level measurements were collected on February 1, 2006 from 13 monitoring wells 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 These data allowed for subsequent estimation of the groundwater flow direction <br />' Groundwater samples were subsequently collected from the nine monitoring wells Samples were not <br /> collected from monitoring wells MW-8, MW-9, MW-10 and MW-12 due to insufficient water <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 /> A three-volume purging and sample technique using a decontaminated stack pump and disposable bailers <br /> was used for groundwater purging and sample collection from monitoring wells (MW-2, MW-3, MW-4, <br /> MW-5, MW-6, MW-7 and MW-11D) Groundwater samples were collected from monitoring wells MW- <br /> 13 and MW-14 using the no purge sampling method due to the minimal amount of water in these wells <br /> Field parameters were measured during purging at monitoring wells MW-2, MW-3, MW-4, MW-5, MW- <br /> 6,MW-7 and MW-11D listed above using the following series of activities and sampling protocols <br /> • <br /> 11462822 doe <br /> 2033 North Main Street .Suite 340.Walnut Creek,CA 94596•Runs#14-848-7635 <br /> Tel(925)274-1100•Fax(925)274-1103.www bbl-ine corn•Offices Nationwide <br />