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L� <br /> Stantec Consulting Corporation <br /> Stantec 3017 Kilgore Road Suite 100 <br /> Rancho Cordova CA 95670 <br /> Tel:(916)861-0400 <br /> Fax:(916)861-0430 <br /> February 14, 2011 <br /> Mr. Brian Taylor, R.G. <br /> California Regional Water Quality Control Board — Central Valley Region <br /> 11020 Sun Center Drive #200 <br /> Rancho Cordova, California <br /> RE: Addendum Work Plan for Human Health Risk Assessment <br /> Former Tosco Bulk Terminal No. 10013 <br /> 3505 Navy Drive <br /> Stockton, California <br /> Dear Mr. Taylor: <br /> Stantec has prepared this addendum work plan on behalf of ConocoPhillips to respond to the <br /> California Regional Water Quality Control Board (RWQCB) letter dated January 18, 2011 <br /> (Attachment 1) which summarized the regulatory review of the Work Plan for Human Health Risk <br /> Assessment dated December 22, 2010. This addendum work plan is composed with the intent of <br /> individually addressing each of the five RWQCB comments listed on the second page of the <br /> January 18, 2011 regulatory correspondence. <br /> The response to the individual comments presented in this document provides further details <br /> regarding the scope and methodologies to complete the proposed human health risk assessment <br /> (HHRA) to determine potential risks to the human health and environment posed by residual <br /> adsorbed and dissolved impacts associated with the subject site including both the on-site and <br /> downgradient off-site receptors. <br /> SITE BACKGROUND <br /> The site is located on the northeastern portion of Rough and Ready Island in Stockton, California <br /> (Figure 1).The 4.3-acre site is bounded on the east by the Lyons Club Golf Course,on the south by <br /> the access road of Navy Drive, and on the west and north sides by vacant land. The Stockton Deep <br /> Water Channel is located beyond adjacent vacant land, approximately 500 feet north-northeast of <br /> the site. The San Joaquin River is located approximately 1,500 feet to the southeast. <br /> The site was initially occupied and used as a bulk storage facility by Mobil Oil Corporation in 1938. <br /> British Petroleum (BP) acquired the site from Mobil in 1989 as a bulk gasoline and diesel storage <br /> facility. Tosco Refining Company acquired the Site from BP in August 1994, and subsequently <br />