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November 2010 pa rim <br /> Project No. 1001-0343 ® , eess,sxns <br /> INGINssss,®EOLOGIsTs a <br /> 4. Chemical analyses of two to three soil samples per drill hole for the presence of <br /> TPH identified as diesel (TPHd) using U.S. EPA method 8015 modified and <br /> BTEX and 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 <br /> onsite 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. <br /> The primary hazards of each are identified along with their concentrations, if known. <br /> u " aFWdCasn� <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 /> OSHA P Ls(Ppmvt - NIOSH$WL8(p my)`. ACatt� I V Opmv} ` <br /> ". . <br /> C.A.A.No. conc.:1 . - <br /> Ar ST1+4 Ceiling Tout,WA, STSs. Carting" TWA St1TLcalling <br /> 71-43-2 Benzene 500 1* 5* 25 0.1 NA la 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 <br /> term 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 /> 10.0343.TVVP_HSP assessmeM <br /> - B - 3 - <br />