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May 2011 adille <br /> Project No. 1001-0343 <br /> psseelefte,lw4`oa <br /> a <br /> 4. Chemical analyses of soil and groundwater samples for the presence of total <br /> petroleum hydrocarbons identified as diesel fuel (TPHd) using U.S. EPA method <br /> 8015 modified and benzene, toluene, ethylbenzene, total xylenes (BTEX) and <br /> methyl tert butyl ether(MTBE) using U.S. EPA method 8260; and <br /> 5. Preparation of an assessment report detailing the field methodologies utilized, <br /> summarizing the chemical analytical results, and presenting Padre's conclusions <br /> and/or recommendations for the Site. <br /> SITE SETUP <br /> A safe perimeter will be established at the work Project Site. The work area will be <br /> restricted to required personnel only. No unauthorized personnel will be allowed within the <br /> established safe perimeter, or will be allowed to enter the Project Site. Control boundaries will <br /> be marked with caution tape if necessary to maintain the established safe perimeter. The onsite <br /> command post will be established at the Padre Associates, Inc. vehicle onsite. <br /> HAZARD EVALUATION <br /> Chemicals Onsite. The following substance(s) are known or suspected to be onsite. The <br /> primary hazards of each are identified along with their concentrations, if known. <br /> BTEX, MTBE in Soil Inhalation and dermal contact Unknown <br /> TPH as Diesel in Soil Dermal Contact Unknown <br /> BTEX, MTBE in Groundwater Dermal Contact Unknown <br /> TPH as Diesel in Groundwater Dermal Contact Unknown <br /> Permissible and Recommended Exposure Limits <br /> kW <br /> t st <br /> ; <br /> 71-43-2 Benzene 500 1* 5* 25 0.1 NA 1a 10 NA NA <br /> 100-41-4 Ethyl- 800 100* 100* 125* 100 125 NA 100 125 NA <br /> benzene <br /> 108-88-3 Toluene NA 50* 150* 500* 100 150 NA 50 NA NA <br /> 1330-20-7 Xylene 900 100* 300* 15* 100 150 NA 100 150 NA <br /> (o-.m-,P- <br /> isomers) <br /> Notes: Concentrations are in parts per million by volume(ppmv)in air. <br /> Abbreviations are: PEL-permissible exposure limit(10-hour TWA); REL-recommended exposure limit(8-hour TWA <br /> unless specifically stated);TLVs-Threshold Limit Values;(8-hour TWA)TWA-time weighted average;STEL-short term <br /> exposure limit (15-minute TWA unless specifically otherwise stated); NA - currently no available concentration for <br /> compound in question. <br /> a Based on 15-minute TWA. <br /> * PEL and STEL are promulgated by Cal-OSHA in California Code of Regulations(CCR)Title 8§5155. <br /> 10.03Q.TWP HSP eseessmer4revised <br /> -B- 3 - <br />