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City of Orono Public <br />Works Department <br />Project No. CMKX-93-0163 <br />September 14, 1994 <br />Page 2 <br />! I <br />A monitoring well (MW-5) will be installed in the soil boring which indicates ’clean- <br />conditions. Should both of the soil borings indicate "clean" conditions, a decision will <br />be made as to which boring the monitoring well will be installed. The monitoring well <br />will be completed to an approximate depth of 20 feet below ground surface. <br />The monitoring well will be developed by a Braun Intertw field technician the day <br />following installation. <br />A vapor risk assessment and survey will be conducted by a Braun Intertec field <br />technician to assess the possible impacts of groundwater contamination to utility <br />trenches and sewers. <br />Monitoring well MW-5 will be sampled following development. The groundwater <br />sample will be analyzed for BETX, MTBE, GRO, orthophosphate as phosphorous, total <br />phosphorous and nitrate plus nitrite as nitrogen. A bailer blank will also be collected <br />and will be analyzed for BETX. <br />Upon receiving the soil and groundwater analytical results from conducting the two soil <br />borings and the installation of MW-5, Braun Intenec will complete the Remedy <br />Investigation/Corrective Action Design (Rl/CAD) Report in accordance with MPCA <br />guidelines. <br />It will be recommended in the RI/CAD that monitoring wells MW-3, MW-4 and MW-5 <br />be sampled quarterly for one year following development of MW-5. ChstfgM <br />associated with this task have been included in this cost proposal. Should the MPCA <br />require additional wells to be sampled, and therefore, additional laboratory analysis, <br />costs will be assessed on a unit basis. The groundwater samples collected from MW-3, <br />MW-4 and MW-5 will be analyzed for BETX, MTBE, GRO, orthophosphate m <br />phosphorous, total phosphorous and nitrate plus nitrite as nitrogen. A b^er blank will <br />also be collected during each sampling event and will be analyzed for BETX. <br />Monitoring wells MW-1 and MW-2 will be used for water level measurements only. <br />Upon receiving each of the first three sets of quarterly groundwater analytic^ result, <br />Braun Intertec will prepare Quarterly Monitoring Reports in accordance with MPCA <br />guidelines. <br />Upon receiving the groundwater analytical results from the final quarter of groundwater <br />sampling, Braun Intertec will prepare an Annual Monitoring Report in accordance with <br />MPCA guidelines. This report will contain recommendations based on the data <br />collected to date as to a request for site closure, additional monitoring, or corrective <br />action.