#07 - Site Access Agreement with Washington County CDA

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4 documented contaminants in groundwater exceed regulatory standards, or (c) it is anticipated that multiple rounds of groundwater sampling will be required to achieve assessment or investigation objectives. Temporary wells will be used in situations where the primary purpose at a sampling location is: (a) to confirm the presence/absence and/or general levels of contaminants in groundwater, (b) to document the depth to groundwater at locations where groundwater samples will not be collected, or (c) to provide the ability to collect groundwater samples at a later date at locations where only soil samples will be collected and analyzed as part of initial sampling activities.. Upon completion of investigation activities, the monitoring wells will be properly abandoned. Groundwater Sampling - Groundwater samples will be obtained from the permanent or temporary groundwater monitoring wells. Groundwater removed from the wells will need to be managed until a determination is made as to whether the groundwater is contaminated. Soil Vapor Sampling - Soil vapor monitoring may be performed at locations based on the results of the soil and groundwater samples. Permanent or temporary vapor probes may be installed to a typical depth of 10 or 20 feet below ground surface. Test Pits – Test pits may be excavated using a backhoe at locations where: (a) buried objects of potential environmental significance such as underground storage tanks are known or suspected to be present, or (b) historic fill materials are known or suspected to be present which can be more effectively evaluated through observation of a broader exposure of material than is possible through sampling conducted via soil borings. Test pits will be conducted only in unpaved areas unless specifically proposed in other locations in the SSSAP and specifically permitted by the Owner. In general, test pits will be 2 to 4-feet in width, 10 to 15-feet in length, and 4 to 12-feet deep. Materials excavated from the test pits will be returned to the test pit on the date of excavation. The surface will not be restored beyond returning the excavated materials to the test pit, roughly smoothing the surface with the backhoe, and compacting the materials by driving over the returned soil with the tires of the backhoe. Due to expansion of soil that occurs upon excavation, mounding of the ground surface may be present following restoration. Investigative wastes (i.e., soil and water) will be properly stored on the Property at a location to be identified by the Owner until such time as laboratory and other analyses are completed by which to determine disposal requirements, if any. The Owner is responsible for storage, management, and the proper disposal of that waste (if necessary). Funding may be available from the grant to pay for the proper disposal. One complete electronic copy on CD of the final report will be provided to you for your use upon completion of the final Phase II ESA Report. As the Phase II ESA is being paid for using a Federal Grant, copies of the report may be provided to the U.S. EPA and/or the MPCA as part of required submittals by the County and become public records. The Owner should review the results contained in the final report and evaluate their reporting obligations to the U.S. EPA and/or MPCA resulting from the potential documentation of the presence of contaminants in soil, groundwater, soil vapor, or building materials at concentrations that exceed regulatory thresholds or standards. Asbestos and Building Materials Inspection The asbestos inspection will be completed by a Minnesota licensed asbestos inspector. The inspection will identify homogenous sampling areas of suspected asbestos containing materials (ACMs) in the structure. Collect and submit samples for analysis using polarized light microscopy by a NVLAP-certified lab. The asbestos inspection standard is a destructive inspection technique to determine the presence of suspected ACMs hidden within wall chases and under flooring. The samples obtained are small but do require holes to be put into walls and ceilings. Repairs will not be made unless agreed to prior to the inspection. The building materials inspection will be performed for those building materials listed in MN Rule 7035.0805. One complete electronic copy of the final report will be provided to you for your use upon completion of the inspection. Although efforts will be made to identify ACM, due to the nature of buildings, restricted access, etc. it is not always possible to fully identify or access all hazardous building materials in advance of demolition; therefore, the owner should secure the services of a qualified asbestos inspector to be on-site if the structure(s) are to be demolished or renovated.