6A(3) - Laserfiche WebLink

Home Browse Search

City of South Bend—Westem/Wayne Re-development March 1, 2011 Page 5 of 8 costs and the specific scope of services for performing any Phase II recommendations will be submitted under separate cover. Included within the report will be the qualifications of the environmental professional responsible for the assessment. TASK 2—PHASE II SITE ASSESSMENT As the proposed re-development of the subject site is residential; historical property uses become of significance given the potential for long-term exposure to residents/children, should contamination be present. We note that the northernmost portions of the subject site were residential until such time as the northeast quadrant was transitioned to a paved parking lot for autos associated with both the historical Gurly-Leep Buick and Gates Chevrolet Body Shop operations. The northwest quadrant continued as residential until such time as demolition of the units began in the mid to late 1980s. With respect to these former residential dwellings, historical heating oil UST systems are likely to be present, as well as significant volume of rubble associated with the former foundations. The southern half of the subject site was historically developed as residential (heating oil USTs, rubble), with subsequent conversion of the lots along Western Avenue to commercial operations that included a former gas station, a former dry cleaners, former department store, former auto battery sales/service facility, and more recently as a transmission repair facility. With the recent demolition of the former transmission repair facility, clean-up of the heating oil UST systems encountered was based on field screening and visual assessment. As such there were no confirmation samples collected as part of the removal actions. In light of the aforementioned, Wightman Petrie proposes some level of confirmation that the area of the general site is consistent with the criteria established under the RISC Residential guidelines. Such confirmation can be accomplished through the collection of various surface and subsurface soil samples, as well as groundwater samples collected from temporary wells. We note that any such borings or temporary wells should consider any additional Recognized Environmental Conditions identified during the completion of the Phase I Environmental Site Assessment(i.e., review of Sanborn Maps, historical aerials, site reconnaissance, etc.). SOIL SAMPLING VIA GEOPROBE METHODOLOGY Using Geoprobe methodologies (small track mounted hydraulically driven sampling probe) soil samples will be collected from a total of eight (8) locations across the subject site (GP1 — GP8). For each of the Geoprobe boring locations, discrete soil samples will be collected from a depth of approximately 1-foot below land surface (surface soils), as well as the interval immediately above the soil/groundwater interface (up to 30 feet below land surface), assuming that there are no other indications of the presence of contamination (visual/olfactory). Surface soils will also be collected from an additional four (4) locations across the subject site. Each 5-ft. soil sample interval (until groundwater is encountered or 30 feet below land surface) 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). Should field screening with the PID indicate the presence of significant VOCs, a sample of the soil in question will be collected and submitted for analysis. Surface soil samples will be analyzed for the presence of RCRA metals; whereas subsurface soil samples selected for laboratory analysis will be analyzed for the presence of Volatile Organic Compounds (VOCs) and Carcinogenic Polynuclear Aromatic Hydrocarbons (CPAHs). Wightman Petrie will utilize IDEM guidance Terra-Core Methods to collect soil samples from each discrete sampling interval for the analysis of VOCs. All soil samples will be labeled, packed on ice and forwarded to the laboratory under chain-of-custody procedures.