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Task 1 — Geoprobe Installation for Soil Sampling Using Geoprobe methodologies (small, track mounted, hydraulically driven, sampling probe) soil samples will be collected from a total of seven (7) locations across the subject site. Proposed soil boring locations are based upon the results of historical document review and locations of identified concerns as documented from the prior investigations. Reasons for sampling, proposed analyses and tentative locations for proposed borings are summarized, as follows: Proposed Reason for Concern/Sampling Proposed Boring Analyses Number Southwest corner side of former building foundation, potential VOCs, Naphthalenes, Lead and contamination from former UST systems Lead Scavengers 2 Area of former garage service bays VOCs, Metals, PCBs 3 Area of former garage service bays VOCs, Metals, PCBs 4 Western property boundary (migration of contaminants VOCs, Naphthalenes, Lead and Lead Scavengers 5 Northwestern property boundary(migration of contaminants) VOCs, Naphthalenes, Lead and Lead Scavengers 6 Western central area of site (migration of contaminants) VOCs, Naphthalenes, Lead and Lead Scaven.ers) 7 Northeastern property boundary (migration of contaminants) VOCs, Naphthalenes, Lead and Lead Scavengers For Geoprobe boring locations, discrete soil samples will be collected at 5-foot intervals throughout the soil profile until saturated soil conditions are encountered. 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 photo ionization 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. Jones Petrie Rafinski proposes to submit a minimum of at least one sample from each of the seven (7) proposed boring locations for Volatile Organic Compounds (EPA Method 8260) based on the PID field screening results and/or other indications of the presence of potential contamination (visual or olfactory). If field screening with a PID, visual or olfactory observations do not indicate the presence of contamination, the depth intervals immediately above the soil/groundwater interface will be submitted for laboratory analysis. In addition, samples collected from within the former service station building will also be analyzed for the presence of RCRA Metals (EPA Method 6010B, 7470-7471) and PCBs (EPA Method 8082). Should any significant oil staining be identified from these same locations, analysis of Polynuclear Aromatic Hydrocarbons (EPA Method 8270 SIM) will also be requested (client to be notified if encountered). Jones Petrie Rafinski will utilize IDEM guidance Terra-Core Methods to collect soil samples from each sampling interval for the analysis of Volatile Organic Compound (VOC) constituents. All soil samples will be labeled, packed on ice and forwarded to the laboratory under chain-of-custody procedures. 5