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Hamilton Body Shop /Hamilton Towing March 27, 2012 Page 6 of 10 autos. Two (2) hand auger borings are also proposed in the general area of the former underground hoist system. Five (5) soil borings are proposed across the 910 -912 S. Lafayette Blvd. property, with emphasis on the areas of hazardous and petroleum storage, trench drains, ASTs, and historical car repair. For the 901 -917 S. Lafayette Blvd. property, ten (10) soil borings are proposed with emphasis on the former USTs, ASTs, paint shop, drum storage, and stained soils associated with releases from wrecked autos. For each of the Geoprobe boring locations, discrete soil samples will be collected at 5 -foot intervals throughout the soil profile until saturated soil conditions are encountered (assumed to be approximately 25 feet below land surface). Each soil sample interval will be screened for the presence of volatile organics by placing a portion of the soil sample into a plastic bag, allowing time for equilibration, and insertion of a photoionization detector (PID) probe to observe a reading of "total VOCs" in parts per million (ppm). All data associated with the field screening of VOCs will be recorded for future reference (Soil Boring Logs). In addition, a portion of each discrete sampling interval will also be collected for submittal to a laboratory. Wightman Petrie proposes to submit one (1) soil sample from each of the nineteen (19) boring locations based on the PID field screening results and /or other indications of the presence of potential contamination (visual or olfactory). In the event that field screening with a PID, visual or olfactory observations do not indicate the presence of contamination; the soil sample collected from the upper two (2) feet within the boring, will be submitted for laboratory analysis. We note that the area of the subject site is serviced by municipal water and sanitary sewer; therefore direct contact through the use of groundwater as a potential pathway for exposure has been eliminated, and therefore direct contact via contaminated surface soils becomes an over - riding concern. Each of the soil samples selected for laboratory analysis will be analyzed for the presence of Volatile Organic Compounds (VOCs) via EPA Method 8260. Most soil samples identified for laboratory analyses will also be analyzed for the presence of carcinogenic Polynuclear Aromatic Hydrocarbons (cPAHs) via EPA Method 8270 (Selective Ion Methodology); however, some will be analyzed for the presence of Total Petroleum Hydrocarbons, Extended Range Organics (TPH -ERO) as an indicator of the presence of significant petroleum contamination. Wightman Petrie will utilize IDEM guidance Terra -Core Methods to collect soil samples from each discrete sampling interval for the analysis of VOC constituents. All soil samples will be labeled, packed on ice and forwarded to the laboratory under chain -of- custody procedures. TASK 4 - Temporary Geoprobe Well Installation for Groundwater Sampling Wightman Petrie proposes to convert a minimum of seven (7) Geoprobe soil borings to temporary wells with insertion of a Geoprobe groundwater sampling device, which allows for the extension of a stainless steel slotted screen for collection of a groundwater sample from the point at which the saturated or water - bearing zone is encountered. For this proposal, Wightman Petrie has assumed that the water - bearing zone will be encountered within 25 -feet of land surface. Once installed, each temporary well would be purged until such time as the water discharge becomes relatively free of solids or until at least three (3) gallons of water have been removed. Wightman Petrie proposes that groundwater from each of the temporary wells be analyzed for Volatile Organic Compounds via EPA Method 8260, and carcinogenic PAHs via EPA Method 8270 SIM. For those temporary wells at which multiple groundwater samples will be collected (total of four); Wightman Petrie proposes that the groundwater sample from the deeper of the screened intervals be analyzed for the presence of VOCs only. Each groundwater sample will be appropriately labeled, packed on ice, and forwarded to the laboratory (priority overnight delivery) under chain -of- custody procedures. Analysis will also include the analysis of a water sample for QA/QC purposes (Volatile Organic Compound only). Wightman Petrie will plug the boreholes /wells with bentonite once soil and groundwater sampling activities have been completed.