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City of South Bend—Western/Wayne Re-development March 1, 2011 Page 6 of 8 TEMPORARY GEOPROBE WELL INSTALLATION FOR GROUNDWATER SAMPLING Wightman Petrie proposes to convert each of the eight (8) Geoprobe soil borings to temporary wells through use of a Geoprobe groundwater sampling device that will be advanced to the soil/groundwater interface, or 30-feet below land surface. The use of the Geoprobe groundwater sampling device allows for the extension of a stainless steel slotted screen for collection of a groundwater sample. Once the desired depth interval has been attained and the sampling device extended (additional 5-feet), the temporary well will be purged until such time as the water discharge becomes relatively free of solids or until at least five (5) gallons of water have been removed. Once the purge process has been completed, a representative sample will be collected within laboratory provided containers. Each groundwater sample (total of eight (8)) will be appropriately labeled, packed on ice, and forwarded to the laboratory (priority overnight delivery) under chain-of-custody procedures. Groundwater samples will be analyzed for the presence of Volatile Organic Compounds via EPA Method 8260. Wightman Petrie will plug the boreholes/wells with bentonite once sampling and water level measurements have been completed. REPORTING Upon receipt of the laboratory analyses, data will be reviewed and tabularized. Comparison of the data for each respective chemical constituent will be made to the Risk Integrated System of Closure (RISC) Default Closure Values for Residential and Industrial/Commercial Properties. Upon completion of the initial data review, a "Letter Report" will be prepared which presents the sample collection and analytical methodologies used during the field phase of the assessment. Copies of the sample location maps, tabulated data and comparison to RISC Default Closure Values will also be incorporated. Recommendations for any additional assessment activities will be made for review and comment. TASK 3—SURVEY OF PUBLIC UTILITY CONNECTIONS As with any proposed residential re-development, the location of public utilities becomes important relative to the conceptual plan, inclusive of housing type and density, the proposed size and width of lots/parcels. While the City of South Bend has prepared an initial conceptual plan for residential housing for the subject site based upon previously existing housing and lot sizes; the location of the utility taps (gas, electric, sanitary sewer and water service connections), have not been located on an established survey of the subject site. Such survey of utility connections is a requirement for the replat of the subject site, as well as Planning Commission review and approval for re-development. Based upon the conceptual plan, there are a total of seventeen (17) parcels for future development, although one (1) existing residential structure currently occupies a double-sized lot. Each of the seventeen (17) parcels require the respective utility connections, which may be present along the adjoining streets or common alleyways at the rear of the parcels. In addition, the conceptual plan calls for four (4) taps (two (2) to the east and two (2) to the west of the north/south alleyway) along Western Avenue and W. Wayne Street. Although it is thought that many of the connections for underground utilities already exist, confirmation and location of such utility runs and connections, as well as documentation of any "missing" or disabled" taps are necessary moving forward in the re-development process. Accordingly WP will utilize accepted survey techniques and established monuments to physically locate/confirm the presence of utility connections associated with the subject site. Such efforts will also involve coordination with each of the utility companies as verification of their service lines, whether active or abandoned. All such confirmed utility service connections will be transferred to an existing Survey Map for future use in planning and re-development of the subject site. � � �