Supplemental Agreement No 2 - United Consulting - Coal Line Trail Phase I

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Mr. Devin Stettler CEC Proposal 161-618 — Phase II ESA Page 4 March 16, 2018 Soil samples will be collected on a continuous basis at approximate 2-foot intervals throughout the depth of each boring. Each recovered soil sample will be classified and screened in the field for the presence of volatile organic vapors using a portable photo - ionization detector (PID) and visually evaluated for obvious visible indications of potential impact. At borings advanced to eight feet bgs, soil samples will be collected for laboratory analysis from two depth intervals as requested by INDOT. One shallow soil sample will be selected from the shallow interval which exhibits the greatest potential for contamination (based on PID readings, visual and olfactory observations), or approximately two to four feet bgs in the absence of field indicators of potential impact. One soil sample will also be collected from the terminus of each boring (approximately six to eight feet bgs). a At borings advanced to five feet bgs, one soil sample will be selected for analysis from the interval most likely to be contaminated. In the absence of observable indicators of potential contamination, the soil sample from approximately three to five feet bgs will be selected for analysis. CEC assumes a total of 24 soil samples will be submitted for analysis. Based on the contaminants of concern (COCs) associated with the sites identified in the in the attached Work Plan, soil samples selected for analysis will be logged on a chain -of - custody form and submitted to the laboratory for analysis that will include volatile organic compounds (VOCs, including naphthalenes and lead scavengers) per United States Environmental Protection Agency (EPA) Method 8260 and lead per EPA Method 6010B. Furthermore, as requested by INDOT, if laboratory results indicate that concentrations of lead in soil exceed 100 milligram per kilograms (mg/Kg) in any soil sample, analysis for Toxicity Characteristic Leaching Procedure (TCLP) lead will be requested for that sample in order to assess the Resource Conservation and Recovery Act (RCRA) waste classification requirements. Based on the review of groundwater data at nearby sites conducted as part of Task 1, groundwater is not expected to be encountered within the borings. However, as noted on the attached INDOT-approved Work Plan spreadsheet, temporary 0.75-inch diameter polyvinyl chloride (PVC) piezometers equipped with five feet of slotted screen will be installed in each of the borings in which groundwater is encountered during drilling or the conclusion of soil sampling activities. If sufficient groundwater is observed, "grab" groundwater samples will be collected from the piezometers using disposable tubing equipped with a check valve. After groundwater sampling activities, the temporary piezometers will be removed and discarded. The groundwater samples will be placed in laboratory glassware, preserved, placed on ice and submitted for laboratory analysis of VOCs (including naphthalenes and lead scavengers) per EPA Method 8260. Additionally, if samples are collected from the borings located near areas of concern with potential petroleum impacts (see the attached Work Plan spreadsheet), groundwater samples will be also be analyzed for lead per EPA Method 6010B. Because the proposed groundwater Civil & Environmental Consultants, Inc.