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6-20-8, N-phuric 15/49, and No. 3 tanks contained UN-32. When these structures were GEOMATRIX <br /> ' removed, the facility employees noted that there was no visible indication of leakage under the <br /> liner materials. <br /> 5.1 HEALTH AND SAFETY <br /> ' In order to protect the field assessment workers, health and safety precautions need to be <br /> addressed. Prior to initiating field assessment activities, Geomatrix has prepared a Health and <br /> Safety Plan for field workers and will obtain drilling permits from San Joaquin County. Level <br /> ' D personal protective equipment (including protective gloves) will be required, unless volatile <br /> emission of ammonia or organic chemicals is detected. A copy of the Health and Safety Plan is <br /> ' included in Appendix B. <br /> ' 5.2 SOIL ASSESSMENT <br /> In order to evaluate the lateral and vertical extent of potential nitrogen migration in the soil at <br /> the HCC facility, Geomatrix proposed to complete 18 exploratory soil borings at the facility <br /> (borings S-1 through S-18, Figure 2). Soil boring locations were selected using the following <br /> criteria: <br /> • One location on-site expected to represent background nitrogen concentrates. <br /> • Areas of nitrogen fertilizer storage (within the "footprints" of the former bulk liquid <br /> ' fertilizer tank farms). <br /> • Areas of previous nitrogen detection in the surface soil samples (adjacent to the <br /> former tank farm areas). <br /> Each soil boring will include samples collected from approximately 0 to 6 inches below ground <br /> surface (bgs), 1 to 1.5 feet bgs, 3 to 3.5 feet bgs, and 5 to 5.5 feet bgs. <br /> Soil borings will be extended using the push probe method and soil samples will be collected in <br /> brass tubes. Prior to advancing each soil boring, the drilling and sampling equipment will be <br /> ' steam cleaned. Soil cuttings will be temporarily stored in drums for future disposal by HCC. <br /> Soil assessment methods will be consistent with the following protocols: <br /> Soil borings will be advanced using the methods described in the "Drilling and Destruction of <br /> Soil Borings" (Appendix Q. <br /> ' Illlldeptdam\PROJEMC519315193.00115193.001-SAWP.dw 4 <br />