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Updated Human Health Risk assessment Natural Attenuation Analysis and Additional Site Investigation Work Plan California Tank Lines, Inc. sinre 1954 3105 South El Dorado Street, Stockton, California 1.0 INTRODUCTION AND BACKGROUND On behalf of California Tank Lines (CTL), Environeering, Inc. (EI) and Taber Consultants have prepared this Updated Human Health Risk Assessment, Natural Attenuation Analysis and Additional Site Investigation Work Plan for submittal to the San Joaquin County Environmental Health Department (SJCEHD) and Central Valley Regional Water Quality Control Board (CVRWQCB). The Report addresses environmental concerns at the CTL property located at 3105 South El Dorado Street, Stockton, California (Site) as directed by the SJCEHD in an April 8, 2010 meeting with representatives from CTL, El and Taber Consultants. 1.1 Site Location and Description The Site is located at southwest corner South El Dorado Street and Ivy Avenue in Stockton, San Joaquin County, California (Figure 1). The Site is occupied by a commercial trucking facility which includes an office building, two truck maintenance shops, a truck-washing rack, a small above-ground storage tank compound, a vehicle fuelling facility, and large parking area for tank trailers. A detailed Site plan is provides as Figure 2. 0 m o ka� s L, Y 1.2 Site History and Previous Subsurface Investigations In 1'990, Bill Messick Co. removed,a-waste oil underground storage tank,(UST) from the -f -04),kp Site. In 1997, Sierra-Pacific (SP) performed a Site investigation to determine the extent of -,i contamination. In,,1998, Station Equipment Company removed a'diesel UST=from the Site. In 1999, El completed an additional Site investigation to further define the extent of contamination beneath the Site. El also began quarterly groundwater monitoring in December LI , 1999. 1J� L . 1449> d- f6wf3 W're- .fr'St44to- ( d L7 -,t�/dCE6 /�/d9>Arci id � 1 5 In 2606, El prepared a work plan to conduct an additional Site investigation as required LI by a SJCEHD directive letter dated May 22, 2006. El submitted an addendum to the work plan, Bon dated August 1, 2006. The addendum proposed extending boring depths from 50 feet to 125 BL�IS"1 feet, and using Cone Penetration Testing (CPT) technology in place of a direct push rig. In October 2007, Western Resource Management (WRM) advanced CPT borings P-1 { f1 V4 7) through P-4. Results from the investigation are reported in the Site Investigation Results and I ^) dW-"D, Site Conceptual Model Report, dated September 30, 2008. In March 2009, Taber Consultants conducted a Sensitive Receptor Survey to identify domestic and public water supply wells within 2,000-feet of the site. f 1 Taber Project No. 051087 L