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adre April 2013 <br />Project No. 1301-0621 <br />associates, Inc. <br />ENGINEERS. GEOLOGISTS <br />9 ENVIRONMENTAL SCIENTISTS <br /> <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 proposed for 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 adjacent to <br />existing underground fuel piping that supplies fuel oil to an emergency power generator. The <br />fuel piping is being replaced and the oversight agency (San Joaquin County) requires a soil <br />assessment along the pipeline corridor to be assessed for the presence of petroleum <br />hydrocarbons and volatile organic compounds associated with diesel fuel. The soil assessment <br />activities will identify if any significant releases of diesel fuel have occurred. <br />The following activities are designed to meet the project objectives: <br />Preparation of a Technical Work Plan (TWP)/site-specific Health and Safety Plan <br />(HSP) prior to implementation of the soil assessment program; <br />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 />Advance ten drill holes (one drill per 20 feet of piping) to depths of approximately <br />5 feet, or the depth at which practical refusal is encountered, whichever occurs <br />first, to facilitate the collection of soil samples for chemical analyses; <br />Chemical analyses of one soil sample (depth of approximately 5 feet) per drill <br />hole (10 soil samples) for the presence of total petroleum hydrocarbons <br />identified as diesel-fuel (TPHd) using U.S. EPA method 8015 modified, and for <br />the presence of benzene, toluene, ethylbenzene, and total xylenes (BTEX) and <br />methyl tert butyl-ether (MTBE) by U.S. EPA method 8260B. <br />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_Kalser Slockton_TVVP-HSP