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May 2011 Project No. 1001-0343 Paese''""''ri� 1.0 INTRODUCTION 1.1 PURPOSE AND OBJECTIVES The purpose of this Technical Work Plan (TWP) is to present the field procedures and protocols to be utilized during the course of the limited soil and groundwater assessment activities planned at the Kaiser Permanente Manteca Medical Center in Manteca, San Joaquin County, California (Project Site). The location of the Project Site is illustrated on Plate 1-Site Location Map and Plate 2—Site Plan. The objective of the limited soil and groundwater assessment program is to safely evaluate an area currently containing one, 8,000-gallon capacity diesel fuel underground storage tank (UST) located west of the Central Utility Plant. The UST is constructed of dual-walled fiberglass and is currently utilized to supply fuel for the facility's boilers and emergency generators. The UST is hydrostatically monitored, which consists of an interstitial fluid (ethylene or propylene glycol) occupying the space between the primary and secondary containment walls of the tank. According to drawings provided to Petro-Analytical, Inc. (PAI) by Kaiser Permanente (Kaiser), the UST is situated at an approximate depth of 12 feet and is strapped to concrete "deadmen" blocks on each side of the UST. A copy of the UST drawing is presented in Appendix A. Kaiser is planning to permanently close the UST in-place and install a new 8,000-gallon diesel fuel aboveground storage tank (AST), which is currently in progress. According to drawings provided to PAI by Kaiser, there are numerous underground utilities located adjacent to the UST that would be structurally compromised as a result of having to remove the UST. Additionally, there is very limited work space around the UST, which would restrict, if not preclude, the installation of shoring. A copy of the utility drawing is presented in Appendix A. To close the UST in-place, the San Joaquin County Environmental Health Department (SJCEHD) requires that two soil samples (and groundwater, if encountered) be collected beneath each end of the UST. This typically requires advancing angled drill holes to assess the areas below the UST; however, due to the presence of underground utilities and limited access of the work area, it is Padre's opinion that this cannot be performed safely. Therefore, Padre proposes to advance two drill holes through the base of the UST once the tank has been partially abandoned to facilitate the collection and soil and groundwater samples for chemical analyses as required by SJCEHD. The following activities are designed to meet the project objectives: • Preparation of a Technical Work Plan (TWP) / Site-Specific Health and Safety Plan (HSP) prior to implementation of the soil and groundwater assessment program; 10.0343.TWP HSP asaeeement revised