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it <br /> ////7APEX <br /> 11244 Pyrifas Way•Gold River,CA 95670 <br /> E N Y I ROTE ( H , IN (. Noe 916.85140174•fox 91&851.0117 fob free 1.800.242.5249 <br /> August 3;2011 <br /> Mr.Nuel'Henderson <br /> San Joaquin County Environmental Health Division <br /> 600 E Main Street <br /> Stockton, California 95202-3029 <br /> Subject: First Quarter 2011 Groundwater Monitoring Report,Soil Vapor Survey <br /> Results Report,Human Health Risk Assessment,and Closure RePort <br /> Moore Petroleum Bulk Plant <br /> 5.491 `F' Street;Banta,California <br /> Apex Project No.ERA02.004' <br /> Dear Mr. Henderson: <br /> Apex Envirotech,Inc. (Apex)has been authorized"by Moore Petroleum(Moore).to provide this <br /> report documenting the results of groundwater monitoring activities for:the first quarter 2011 <br /> conducted on January 25 and 26,2011. This report also documents the results of soil vapor <br /> sampling activities conducted on January 21,2011, and results of a human health risk assessment <br /> (HHRH)conducted based on the results of the.vapor sampling. Based on favorable results of the <br /> HHRH,a closure report is also included with the report as requested by the August 5, 2010, <br /> letter from the San Joaquin County Environmental Health Division(SJCEHD) included as <br /> Appendix A. <br /> Remediation system compliance sampling was not performed this quarter due to.the remediation <br /> system being turned off for the entire reporting period. Groundwater monitoring results are <br /> provided in the attached figures and tables. Apex Standard Operating Procedures,field data,and <br /> analytical results are provided as,Appendices B through D,respectively: <br /> This report is based, in part,on information obtained by Apex from Moore, and is subject to <br /> modification as.ne. wly acquired information may warrant. <br /> BACKGROUND <br /> Apex began work on this project with groundwater monitoring beginning on January 14, 1994. <br /> Prior to Apex,work conducted at the site included subsurface.investigations and groundwater <br /> monitoring by Earth Treatment Systems (ETS),Inc. of Manteca, California,'Delta Environmental <br /> Consultants,Inc. (Delta)of Rancho Cordova, California,Nations Groundwater Associates <br />