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

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City of Ramsey Project B1700969 March XX, 2017 Page 7 DRAFT E.2.a. Temporary Monitoring Wells After the soil borings were advanced about 2 feet into the water table, temporary monitoring wells were constructed using 1-inch-diameter PVC riser and a 5-foot long, 10-slot screens. Following well use, the well materials were removed, and the boreholes were sealed in accordance with applicable code requirements. E.2.b. Groundwater Analyses Groundwater samples collected from the temporary wells were submitted to Pace Analytical Services of Minneapolis, Minnesota and analyzed for the following parameters: ■ VOCs using EPA Method 8260 ■ DRO using the WDNR Method E.3. Soil Vapor Evaluation E.3.a. Soil Vapor Probes Three temporary soil vapor probes (SG-1 through SG-3) were advanced, using a hydraulically -driven push -probe rig, to a depth of 5 feet bgs and then retracted to a depth of 4 feet bgs. New, inert tubing was attached to the top of the downhole sampler, and the sampling point and tubing were purged with a hand pump to remove two volumes of air prior to sample collection. Following purging, organic vapor concentrations were screened with a PID and the value was recorded. The soil vapor samples were then collected using laboratory -supplied negative pressure air -sample collection canisters (6-liter canisters) equipped with 200 milliliter per minute (mL/min) flow restrictors in accordance with the MPCA guidelines. Following sample collection, the temporary sampling point was removed from the borehole, and the borehole was sealed in accordance with MDH guidelines. The soil vapor samples were submitted to Pace Analytical Services of Minneapolis, Minnesota and analyzed for VOCs using EPA Method TO-15. BRAUN INTERTEC