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May 2013 re <br /> Project No. 1301-0621 associates, "$: <br /> assns. :� <br /> 1.0 INTRODUCTION <br /> 1.1 PURPOSE AND OBJECTIVES <br /> The purpose of this Technical Work Plan (TWP) is to present the field procedures and <br /> protocols to be utilized during the course of soil assessment activities planned at the Kaiser <br /> Permanente facility located at 7373 West Lane in Stockton, San Joaquin County, California. <br /> The location of the Project Site is illustrated on Plate 1-Site Plan. <br /> The objective of the soil assessment activities is to assess soil located beneath an <br /> existing underground fuel piping run that supplies fuel oil to an emergency power generator. <br /> The fuel piping is being replaced and the oversight agency (San Joaquin County Environmental <br /> Health Department) requires soil beneath the pipeline corridor to be assessed for the presence <br /> of petroleum hydrocarbons and volatile organic compounds associated with diesel fuel. The soil <br /> assessment activities will identify if any significant releases of diesel fuel have occurred. <br /> The following activities are designed to meet the project objectives: <br /> 1. Preparation of a Technical Work Plan (TWP)/Site-specific Health and Safety Plan <br /> (HSP) prior to implementation of the soil assessment program; <br /> 2. Completion of a pre-assessment site visit to position and demarcate the <br /> proposed drill hole locations prior to notifying Underground Service Alert (USA) <br /> for clearance of potential underground utilities; <br /> 3. Advance seven angle drill holes (one drill per approximate 20 feet of piping) <br /> using direct-push drilling technology to approximate vertical depths of 7 feet <br /> (2 feet beneath piping), or the depth at which practical refusal is encountered, <br /> whichever occurs first, to facilitate the collection of soil samples for chemical <br /> analyses; <br /> 4. Chemical analyses of one soil sample per drill hole (7 soil samples) for the <br /> presence of total petroleum hydrocarbons identified as diesel-fuel (TPHd) using <br /> U.S. EPA method 8015 modified, and for the presence of benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX) and methyl tert butyl-ether (MTBE) by <br /> U.S. EPA method 8260B. <br /> 5. Preparation of an assessment report detailing the field methodologies utilized, <br /> summarizing the chemical analytical results, and presenting Padre's conclusions <br /> and/or recommendations pertaining to the Site. <br /> 13.0621 Kaiser Stockton TWP-HSP revised <br />