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SECOI vw ea;r.com <br /> N INTERN, . . dONAL 5017 Kilgore Road , Suite 100 <br /> INCORPORATED Rancho Cordova , CA 95670 <br /> 916-861 -0400 TEL <br /> 916-861 -0430 FAX <br /> June 5, 2007 <br /> Ms. Lori Duncan <br /> San Joaquin County J[/ <br /> Environmental Health Department N <br /> 600 East Main Street FN lRo ? 200 <br /> Stockton , CA 95202-3029 %17, Avr//,r & <br /> �cq�. r <br /> RE: Addendum to " Work Plan for Additional Assessment" dated April 27,36'07 <br /> ARCO Service Station 548 <br /> 1612 West Hammer Lane <br /> Stockton , California <br /> SECOR Project Ni 77BP.00548 .01 . 0136 <br /> Dear Ms , Duncan : <br /> This letter, prepared by SECOR International Incorporated (SECOR) on behalf of Atlantic <br /> Richfield Company, a BP Affiliated Company, presents an addendum to SECOR's Work Plan for <br /> Additional Site Assessment dated April 27, 2007 for the site referenced above. The scope of <br /> work of the original workplan called for the installation of three groundwater monitoring wells. In <br /> This addendum has been prepared in response to your letter dated May 14, 2007 <br /> (Attachment 1 ). Two additional shallow zone monitoring wells (MW-12 and MW- 13) will be <br /> installed to define the shallow plume downgradient of VW4. In addition , the location of <br /> proposed well MW- 10 has been moved laterally east to further define the southern extent of the <br /> plume . A site plan showing the locations of the proposed wells is included as Figure 1 . Field <br /> and laboratory procedures outlined in the original workplan will remain the same. <br /> Should you have any questions regarding this project, please feel free to contact the <br /> undersigned at (916) 861 -0400. <br /> Sincerely, <br /> QFtOFESS/ON <br /> SECOR International Incorporated <br /> Prepared by: Reviewed by: <br /> CLl 583 ` m <br /> �N � � EXP. 1 1 /2008 � <br /> Kristin Shelton Rusty Ben y, P. E. <br /> Associate Engineer Principal ineer sT civil <br /> 9TFOFCAI.W <br /> Figure 1 Site Plan with Proposed Monitoring Wells <br /> cc: Mr. James Barton , Regional Water Quality Control Board , Central Valley Region <br /> Mr. Don Pratt, Atlantic Richfield Company ( Uploaded to Enfos) <br /> Uploaded to Geotracker <br />