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100208_Packet
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100208_Packet
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Ms. Debra Bloom <br />Page 2 <br />December 29, 2009 <br />It is the MPCA VIC program staff opinion that additional investigation is necessary to <br />determine if impacted perched groundwater is migrating onto the Site from the adjoining PIK <br />parcel and impacting the soil and groundwater at the Site. <br />Additional information is needed in the development of the RAP/CCP to describe the <br />proposed roadway development plans in more detail and to develop contingencies and <br />response actions to the soil and groundwater contamination that is potentially present. <br />Specifically, the MPCA requests the following additional investigation requirements: <br />• Advance several additional borings on the north side of the roadway and to the south of <br />borings P-53 and P-28, to the east of the former Indianhead Warehouse building; <br />• Advance one or two borings on the north end of Prior Avenue, to the north of the <br />roundabout; <br />• Advance one or two borings in the roadway at the south end of the former PIK <br />maintenance building located near Author Avenue; <br />• Collect and analyze several soil samples from each boring, and analyze the samples for <br />volatile organic compounds (VOCs). One sample shall be collected near the surface, <br />where soils are proposed to be excavated for the roadway and a deeper sample shall be <br />collected near the depths that the utilities will be excavated; <br />• In the area of the former PIK maintenance building analyze samples for VOCs, <br />polynuclear aromatic hydrocarbons, 8 RCRA metals, and diesel range organics; and <br />• Collect a perched groundwater sample from each of the borings and analyze the samples <br />for VOCs. <br />The MPCA also requests the following modifications to the RAP/CCP: <br />• Provide information in the RAP describing the anticipated depths that will be excavated <br />for the roadway and utility installation. Cross-sections would be helpful to determine if <br />the depths excavated for the utilities will encounter contaminated soil or groundwater; <br />• Provide information on the clean-up goals for the project. Discuss in regards to the Soil <br />Reterence Values (SRVs) and the Soil Leaching Values (SLVs); <br />• Discuss the criteria for determining if soil can be reused on the Site with regards to the <br />SRVs and SLVs; <br />• Provide an estimate of the amount of impacted soil that will be encountered and require <br />disposal; <br />• Taking into account the additional groundwater investigation required above, provide <br />information on how perched groundwater will be prevented from impacting and <br />migrating through the utility trenches; and provide more detailed information on the <br />treatment, sampling, and disposal of impacted perched groundwater. <br />
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