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RfIM1C�'�-1fRNfR <br /> Mr. Charles Leubner. � <br /> I� <br /> 9 July 1997 :p <br /> Page 4 <br /> Field screening of soil samples will be conducted by monitoring the headspace of sealed plastic bags <br /> containing soil samples for the presence of organic vapors, Organic vapors will be measured by a <br /> flame ionization or photo-ionization detector equipped with'an 10 peV bulb. Results of the headspace <br /> monitoring and the visual inspections will be noted on attached soil boring logs . <br /> :a <br /> LABORATORY ANALYSES ; <br /> The soil samples selected for analysis will be delivered with completed chain-of-custody forms to <br /> Excelchem Environmental Labs in Roseville, a State-certified laboratory. The specific samples to be <br /> analyzed from each boring are those identified in the Background and Sampling Rationale section. <br /> Samples from the diesel tank and piping will be analyzed for total' etroleum hydrocarbons as diesel <br /> P <br /> (TPH-D) by EPA 8015 modified and benzene, toluene, ethylbenzene and xylenes (BTEX) by EPA i <br /> Method 8020. Samples collected from the soil borings at the gasoline tank will be analyzed for total <br /> petroleum hydrocarbons as gasoline (TPH-G) by EPA 8015'modified and BTEX. Samples from the <br /> deep soil boring for the gasoline tank excavation will also be analyzed for MTBE by EPA Method <br /> f 8020. <br /> �E <br /> PREPARE PRELIMINARY SITE ASSESSMENT REPORT <br /> 4B i <br /> The preliminary site assessment report will include soil bo firing logs, site plans indicating sampling <br /> locations, tabulated results of laboratory analyses, and{i conclusions regarding the extent of <br /> hydrocarbons. If laboratory analyses show that contamination remains in soil beneath the site, we <br /> will prepare an assessment of potential impacts of the renainirg hydrocarbons using EPA's V- <br /> f LEACH model and the Tier 2 Risk-Based Corrective Action (RBCA) model that is described in <br /> E ASTM E-1739 Standard Guide for Risk-Based Corrective Action Applied at Petroleum Release <br /> f Sites. 3� <br /> ' i• <br /> SCHEDULE �S <br /> The field investigation will commence within two weeks of receiving written approval of the <br /> g g PP <br /> PreliminarySite Assessment Work Plan b the County. It is aritici aced that the field work will <br /> Y tY _ P <br /> require one week to complete. Laboratory analyses will b`e completed on the standard two week <br /> turnaround. The Preliminary Site Assessment Report will gibe submitted to the County within four <br /> weeks of receiving the results from the laboratory. it <br /> �E <br /> f <br /> i <br /> iP <br /> r <br />