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Decatur Neighborhood Services Division BES Proposal#02-0276 <br /> Subsurface Investigation July 5,2002 <br /> 1.5 BODINE shall submit the soil samples to the PDC Laboratories, Inc. for analysis of <br /> BTEX(SW 846 Method 5035) and Lead(SW 846 Method 6010 and SPLP). The borings <br /> shall be screened with a Photovac Micro-Tip Photo-ionization Detector(PID)to <br /> deternune appropriate interva.ls to collect samples for laboratory analysis. Tota1 and SPLP <br /> Lead analysis is necessary to legitima.tely compare the soil concentration values to the 35 <br /> Illinois Administrative Code 742, Tiered Approach to Conective Action Objectives <br /> (TACAO) Migration to Groundwater and Residential Ingestion/Inhalation Objectives. <br /> 1.6 Based upon the information reviewed in the Phase I Report, assessment of the potential <br /> for adjacent properties to impact groundwater was identified. Therefore, BODINE shall <br /> utilize the truck mounted geoprobe unit to install 1 inch diameter temporary wells in the <br /> one of the subsurface borings at each of the Properties,provided groundwater is <br /> encountered within 15 feet bgs. The temporary wells will be sampled for Volatile Organic <br /> Compounds (VOCs). Groundwater samples will be submitted to PDC Laboratories for <br /> analysis using SW 846 Method 8260 for aqueous samples. <br /> 1.7 It is anticipated that one sample from each soil boring location will be collected for <br /> chemical analysis. The vertical sample locations shall be determined in the field using the <br /> PID and visual observations. The location within each boring that exhibits the highest PID <br /> reading shall be collected for analysis. If PID readings do not indicate the presence of <br /> VOCs, a grab sample sha11 be collected at an interval consistent with the highest potential <br /> for the presence of contamination. <br /> Up to 6 total soil samples may be submitted to the PDC Laboratories, Inc. for analysis. <br /> Sampling and laboratory protocol shall follow USEPA procedures identified in SW-846, <br /> Method 5035/8260B using Terracore sampling devices for BTEX, Method 8270C/625 for <br /> PAHs, and Method 6020/200.8 for Lead and SPLP eXtraction. Proper sample <br /> preservation and Chain of Custody shall be followed. <br /> 1.8 Upon completion of the subsurface investigation, each boring location and/or temporary <br /> well shall be filled with bentonite to surface to minimi�e migration of surface water to <br /> groundwater. <br /> -3- <br /> BODINE ENVIRONMENTAL SEAVICES,INC. <br />