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- 'N I <br /> AECOM <br /> AECOM Environment �L W,F <br /> 10461 Old Placerville Road, Suite 170 <br /> Sacramento,California 95827-2508 . FEB 6 ���9 <br /> T 916 362-7100 F(916)362-8100 www.aecom.com <br /> ENVIRONMENT HEALTH <br /> February 5,2009 PERNT/SERVICES <br /> Mr. Harlin Knoll <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 E. Main Street <br /> Stockton, California 95202 <br /> RE: Addendum to Work Plan for Soil Groundwater,and Vapor Assessment in Support of Site <br /> p pp <br /> Closure <br /> Stockton Scavenger Company Facility <br /> 1240 Navy Drive, Stockton, California <br /> ENSR Project No. 05027-035-200 <br /> Dear Mr. Knoll: <br /> On behalf of Norcal Waste Systems, Inc. (Norcal), AECOM Environment(AECOM), formerly ENSR <br /> Corporation (ENSR), is submitting this work plan addendum for soil, groundwater, and soil vapor <br /> assessment in support of site closure at the former Stockton Scavenger Association Site located at 1240 <br /> Navy Drive, Stockton, California (Figure 1). The locations of former and current site features are <br /> illustrated on Figure 2. The original work plan was submitted on December 18, 2008. <br /> The scope of work revisions are based on the unavailability of historic soils assessment data. This lack of <br /> soils assessment data was discovered during reviews of San Joaquin County Environmental Health <br /> Department(SJCEHD) and Central Valley Water Board historic files. In a phone conversation between <br /> Mark Capps of AECOM and Harlin Knoll of SJCEHD on February 3,2009, Mr. Knoll requested soil <br /> samples be collected and analyzed to provide current soils data. Mr. Knoll also requested that vapor _ <br /> sampling boring V-1 be re-located to an area nearer occupied buildings. <br /> Changes to Proposed Scope of Work <br /> Soil Characterization <br /> In response to the unavailability of historic soils data and to provide current soils data, AECOM proposes to <br /> collect soil samples from soil borings B08-1 through B08-4 at depths of:10 and 30 feet below ground surface. <br /> Soil samples will be analyzed for total petroleum hydrocarbons as gasoline(TPHg); benzene, toluene, i <br /> ethylbenzene, and total xylenes(BTEX); and 1,2 dichloroethane(1,2-DCA) by US.Environmental Protection <br /> Agency(EPA).Method 82606, and for total petroleum hydrocarbons as diesel(TPHd) by US EPA Method <br /> 8015B. <br /> Groundwater Laboratory Analysis <br /> AECOM will submit the eight groundwater samples for laboratory analysis to CLS, a California state- <br /> certified laboratory, under chain-of-custody protocols. The groundwater samples will be analyzed for TPHg, <br /> E <br /> BTEX and 1,2-DCA by US Environmental Protection Agency(EPA) Method 82608. The samples will also <br />__ i <br />