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November 2010 re Project No. 1001-0483 Fcaseclates, eN K» 1.0 INTRODUCTION 1.1 PURPOSE AND OBJECTIVES Th purpose f this Technical Work Plan TWP is to resent the field procedures and The pu po o ( ) p protocols to be utilized during the planned in-place closure of one, 8,000-gallon capacity diesel fuel underground storage tank (UST) located at the Kaiser Permanente Manteca Medical Center, 1777 West Yosemite Avenue, Manteca, San Joaquin County, California (Project Site). The location of the Project Site is illustrated on Plate 1-Site Location, and a site plan is shown on Plate 2-Site Plan. The objective of the project activities is to perform the in-place closure of one, 8,000-gallon capacity diesel fuel 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 a brine solution that occupies the interstitial space between the primary and secondary containment walls of the tank. Additionally, the UST is strapped to a concrete hold-down slab that is reportedly situated at an approximate depth of 14 to 15 feet. According to correspondence from Mr. Aaron Newman, P.E. with Culpepper + Forgensi Architects, the structural integrity of underground utilities located over the top and in close proximity to the UST would be compromised as a result of having to remove the UST. Additionally, there is limited work space around the UST, which would restrict the installation of shoring. Therefore, Kaiser Permanente has requested from the San Joaquin County Environmental Health Department (SJCEHD) that the UST be closed in-place. A copy of Mr. Newman's letter is presented in Appendix A. After the in-place closure activities, Padre will perform a limited soil and groundwater assessment activities in the vicinity of the UST and associated underground piping. Selected soil and groundwater samples will be chemically analyzed for the presence of total petroleum hydrocarbons identified as diesel fuel (TPHd) using U.S. EPA method 8015, modified and for the presence of benzene, toluene, ethylbenzene, total xylenes (BTEX) and methyl tert butyl ether (MTBE) using U.S. EPA method 8260. Following receipt and review of the analytical data, Padre will prepare a report documenting the limited soil and groundwater assessment program that will be signed and certified by a State of California-licensed Professional Geologist. 10.0343.7 W P_HSP_a ba mlonmen! - 1 -