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r <br /> `moo <br /> it <br /> WORK PLAN FOR ADDITIONAL <br /> SUBSURFACE SITE INVESTIGATION <br /> FOR PETROLEUM HYDROCARBONS <br /> SITE NO. 5 (SITE CODE 1237) <br /> PORT OF STOCKTON <br /> Near Port Roads 21 and N <br /> Stockton, San Joaquin County, California <br /> +- 1.0 INTRODUCTION <br /> This work plan has been prepared by Philip P. Ross, R.G., at the request of Mr. Jay Jahangiri, <br /> Director of Environmental and Regulatory Affairs of the Port of Stockton (Port). The Port <br /> conducted an initial subsurface investigation for petroleum hydrocarbons at this site on August 4 <br /> and 5, 1998, in response to a"Notice of Responsibility"issued by San Joaquin County Public Health <br /> Service, Environmental Health Division (PHS/EHD). Analyses of soil and groundwater samples <br /> collected during this investigation indicated the presence of petroleum hydrocarbons in several of <br /> •r the borings. Based on these findings, the PHS/EHD, in a letter dated November 13, 1998, <br /> requested that the Port conduct further investigation to evaluate the lateral and vertical extent of <br /> contamination at the site and conduct a supply well survey in the vicinity of the site to identify any <br /> public or environmental health threats or impacts resulting from contaminant migration from the <br /> site. Subsequently,the Port and Philip Ross met with the PHS/EHD to further refine and clarify the <br /> scope and objectives of this additional subsurface site investigation. This work plan is in response <br /> to the PHS/EHD request. <br /> 2.0 SITE BACKGROUND <br /> This section presents the site description, summarizes previous site characterization work, and <br /> briefly summarizes the geologic and hydrologic characteristics of the site. Pertinent background <br /> .. information,upon which this section is based, is contained in the"Work Plan for Initial Subsurface <br /> Investigation," (Boyajian & Ross, Inc. [B&R], 1998a) and "Initial Subsurface Investigation of <br /> Petroleum Hydrocarbons," (B&R, 1998b). <br /> PHILIP P. ROSS, R.G. <br /> .s�.� <br /> 60 <br />