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Response Action Plan and Construction Contingency Plan June 10, 2016 Attachment C Former PIK Terminal, Roseville, MN the crusher to minimize dust. The material will be crushed to class five gravel and the intention is to use the material on construction projects throughout the area. The stockpiles are also anticipated to be located on the far western edge of the property which will allow easy access to Interstate Highway 35W. The length of time the stockpile will remain on the property is not known and is dependent on the market demand for class five in the near future. The stockpile may generate some dust as it dries; however, a rain event will wash off any remaining dust resulting in negligible dust emissions thereafter. Minor amountsof dust may also be generated when the material is being loaded into trucks for off-site reuse. No dewatering or groundwater extraction is anticipated to be necessary in order to remove the remaining concrete and blacktop. 2.3 Observation and Monitoring In order to reduce the risk that that impacted soil, concrete, and bituminous do not get mixed into the final product destined for reuse, environmental monitoring is proposed. The proposed observation and monitoring activities will include: Observation and monitoring on an as-needed basis of soils, concrete, and bituminous that are observed to be stained to segregate contaminated concrete or bituminous and watch for unexpected conditions. Impacted concrete or bituminous, determined via visual observation or materials with a strong odor, will be removed separately and will be stockpiled for disposal at a landfill. In areas where impacted concrete or bituminous are encountered, underlying soil will be screened for elevated organic vapors using a photoionization detector (PID) equipped with a 10.6 eV lamp. Soils exhibiting 10 ppm or greater PID headspace readings encountered at the surface will be excavated until PID readings are less than 10 ppm or a depth of two feet to remove any impacted surficial soil. Soils exhibiting less than 10 ppm PID readings with no visible staining or debris will remain undisturbed. Excavated soil will be stockpiled on poly sheeting and covered by poly at the end of each work day for disposal at a landfill. Sampling and testing will be performed as necessary to evaluate the suspect soil to determine acceptable recipient facilities. Results of the response actions will be documented in an implementation report that will be submitted upon completion of the response actions. The depth and lateral extent of any excavations will be documented, and estimated volumes of 4