Agenda - Council - 10/10/2017 - Laserfiche WebLink

Home

City of Ramsey Project B1700969 March XX, 2017 Page 5 determined using Global Positioning System (GPS) technology. GPS coordinates for the investigation locations are included in Appendix B. Standard Operating Procedures (SOPs) for the investigation are included in Appendix C. E.1. Soil Evaluation E.1.a. Soil borings Braun Intertec subcontracted Bergeson -Caswell, Inc. of Maple Plain, Minnesota to advance nine soil borings, designated as S-1 through S-9, at the Site to depths ranging from 8 to 28 feet bgs. The soil borings were advanced with a hydraulically -driven push -probe sampling rig. To collect the soil samples from the borings, a disposable thin -walled PVC liner was placed inside of a 4-foot long sampling tool. The borehole was then advanced using a dual -tube system, which allows for the inner sampling tool to be pushed through a larger outer -diameter rod a total penetration depth of up to 4 feet. After advancing the tooling, the sampler was removed from the borehole, but the outer rod remained, keeping the borehole open, and the soil sample was retrieved from the PVC liner for field screening and classification. The process was then repeated to the termination depths of the borings. Prior to arrival onsite, the drill rig and sampling equipment were cleaned with a high pressure, hot water sprayer. Between sampling locations, non -dedicated sampling equipment was cleaned with a soap and water scrub followed by a clean water rinse. Upon completion, soil borings were sealed in accordance with Minnesota Department of Health (MDH) regulations and, if applicable, the concrete or asphalt surface at the boring location was patched. E.1.b. Soil Classification and Monitoring Soil samples from the soil borings were visually and manually classified in the field by an environmental technician using ASTM D 2487 "Unified Soils Classification System" and ASTM D 2488 "Recommended Practice for Visual and Manual Description of Soils." Additionally, soils were classified at the Braun Intertec soils laboratory by a geotechnical engineer using ASTM D 2487 and ASTM D 2488. Soil samples retrieved were examined by an environmental technician for unusual staining, odors, and other apparent signs of contamination. In addition, the soil samples were screened for the presence of organic vapors using a PID. The PID was equipped with a 10.6-electron-volt lamp and calibrated to an isobutylene standard. The PID was used to perform direct measurement and a headspace method of field BRAUN INTERTEC