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ARCADIS <br /> t, ARCADIS <br /> Infrastructure, environment, buildings 3240 EI Camino Real <br /> Er"" WED <br /> Suite 200 <br /> Ms. Kristi Shelton, P.E. 'n1Irvine <br /> California Regional Water Quality Control Board U u California 92602-1385 <br /> Central Valley Region FEB 2 6 Z0,10 Tel 714.730.9052 <br /> 11020 Sun Center Drive, Suite 200Fax 714.730.9345 <br /> Rancho Cordova, California 95670-6114 ENVIR01NmENT HEALTH www.arcadis-us.com <br /> PERNIITISERVICES <br /> Subject: <br /> Response Letter ENVIRONMENTAL <br /> Corral Hollow and Grant Line Roads Site <br /> Tracy, California <br /> Dear Ms. Shelton: <br /> Date: <br /> On behalf of Chevron Environmental Management Company (Chevron EMC), February 25, 2010 <br /> ARCADIS U.S., Inc. (ARCADIS) has prepared this response letter for the Corral <br /> Contact: <br /> Hollow and Grant Line Roads Site (the Site) located in Tracy, California. This Mr. Allen Just, P.E. <br /> correspondence was prepared in response to the California Regional Water Quality <br /> Control Board, Central Valley Region (Regional Board) letter dated February 9, 2010 Phone: <br /> (copy attached), which provided comments related to the proposed scope of work 714.730.9052 Ext 38 <br /> included in ARCADIS' Addendum to Site Closure Report dated November 12, 2009. <br /> Email: <br /> In the letter, the Regional Board requested the following: AIIen.Just@arcadis- <br /> us.com <br /> (1) By March 1, 2010, Chevron needs to notify the Regional Board if it intends to <br /> drilla soil boring near SB-8; and Our ref: <br /> B0047033.0000.00001 <br /> (2) By April 30, 2010, Chevron needs to drill the four soil borings, collect and <br /> analyze the soil and groundwater samples,and submit a report of findings. <br /> Response to Item No. 1 <br /> Chevron does not plan to drill a soil boring near S-8 at this time. Chevron will initiate <br /> communications with the City of Tracy to actively pursue a mechanism for restricting <br /> access to the area surrounding the location of soil-boring S-8. During this process, <br /> Chevron will provide monthly updates to the Regional Board with respect to their <br /> progress. <br /> Response to Item No. 2 <br /> Chevron is requesting a deadline extension of May 31, 2010 to complete the <br /> proposed work in Item 2. The additional time will allow Chevron to coordinate the <br /> proposed soil and groundwater sampling with the semi=annual groundwater <br /> monitoring event conducted during the 2nd quarter. In addition, Chevron intends to <br /> redevelop existing wells prior to the 2nd quarter sampling event, in an attempt to <br /> improve turbidity readings observed in recent sampling events. The extension <br /> Imagine the result <br />