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C-) WORK PLAN Check for the Presence of Contaminants Adjacent to a Waste Oil Tank Closed in Place in April, 1988 Check for the Presence of two Additional USTs On-Site 1.0 Introduction 1 R& L Diesel Services (R& L) operates a diesel repair and parts business at a site located at 2417 West Lane in Stockton, CA. A Site Location Plan, copied from a Phase I Site Assessment completed by AEI Consultants in October, 2004, is included as Figure 1, and a Site Map, copied from a Phase I Site Assessment completed by All Environmental, Inc. in October, 1994, modified to reflect recent changes, is included as Figure 2. An underground used oil tank was closed in place by R& L in April, 1988, by filling with concrete. The work was approved and witnessed by the San Joaquin Local Health District(SJLHD). Soil samples were not taken from under the tank at that time as the company relied on CCR Title 23, Chapter 16, p 7.9 (d),which stated that leak detection monitoring could be used to demonstrate that no unauthorized release had occurred. The SJLHD did not issue a closure letter at the conclusion of the closure in place, and now requires soil samples be taken and analyzed before a letter will be issued. This work plan covers the work proposed to secure these samples. I The underground tank is located in the Transmission Shop under a concrete slab. Lack of headroom precludes using standard drilling rigs to secure the soil samples. Available options include using a special drill rig capable of drilling horizontal, or a manual soil sampler. The horizontal drill would have to set up outside the building, approximately 100 ft. from the UST. Therefore, we propose to use the manual soil sampler, as described 1 �