COMPLIANCE INFO_2005-2010 - Laserfiche WebLink

Home Browse Search

November 2010 ■ Passoclatom, ina. Project No. 1001-0343 ® ENQ1"FFP1*,GeoLOo�CItNMn 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 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 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. Kaiser Permanente is planning to permanently close the UST in-place and install a new 8,000-gallon diesel fuel aboveground storage tank (AST). According to correspondence from Mr. Aaron Newman, P.E. with Culpepper + Forgensi Architects, the structural integrity of underground utilities located on 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. A copy of Mr. Newman's letter is presented in Appendix A. Padre is proposing to perform the limited soil and groundwater assessment activities after the existing UST has been permanently closed in-place. Therefore, 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; • Completion of a pre-assessment site visit to position and demarcate the proposed drill hole locations prior to notifying Underground Service Alert (USA) for clearance of potential underground utilities. Additionally, Padre will utilize a private utility locating company (Subtronic Corporation) in an attempt to locate potential underground lines and structures not identified through the USA notification; • Advance two drill holes to depths of approximately 15 to 20 feet, or the depth at which groundwater is encountered, whichever occurs first, to facilitate the 10.0343.TWP HSP assessment