02-14-1994 Council Packet - Laserfiche WebLink

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City of Orooo Public Works Dqjartment Project No. CMKX-93-0163 January 28. 1994 Pase4 Based on the field headspaa reults observed during drilling of the boring conducted , south of the former 3,000-gallon unleaded gasoline UST, Braun Intertw mzy or may not install a monitoring well at this location. If soil screening results indicate soil fi^nntaminatinn at this location, the boring will be completed as an above-grade monitoring well. If no signs of contaminatioc are exhibited, a well will not be installed in this boring, per MPCA verbal suggestion. Three above-grade monitoring wells will be installed in the remaining three soU borings which will surround the location of the former 560-gallon di«el fuel UST. For cost estimating purpose, it is assumed that four monitoring well wUl be installed at this site. Please sec Figure 3 in Appendix A for the proposed monitoring well locations (MW-1 through MW-4). The monitoring welts will be developed by a Braun Intertec field technician. A foil round of water level measurements will be collected following development of the monitoring wells. In-sini hydraulic conductivity tests will be conducted by Braun Intertec field personnel in two of the monitoring wells. The monitoring wells will be sampled after water levels have been obtained and again in approximately three months. The monitoring well which may be placed south (presumed downgradient) of the unleaded UST basin wfll be analyzed for volatile organic compounds (VOCs) and GRO for the first round, and assuming no non petroleum related VOCs are detected. BETX and GRO the second round. The monitoring wells placed around the fuel oil UST basin will be analyzed for (VOCs) ami DRO for the first round, and assuming no non-petrclrom related VOCs are deteaed, BETX and DRO for the second round. A bailer blank will also be colleaed during both sampling events and will be analyzed for VOCs during the first round and BETX for the second round. Following completion of the remedial investigation, Braun Intertec will prepare a Remedial Investigation/Corrective Action Design Report in accordance with MPCA guidelines. The costs for the corrective aaion design assumes a groundwyter monitoring or no action alternative. If corrective action involving active remediation systems (e.g., soil venting, groundwater pumping and treating, bioremediatlon, etc.) are necessary, Braun Intertec will prepare a Comprehensive Corrective Action Plan (CCAP) based upon the listed unit costs.