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1 Coolo xa Tecfu,r Inc 0 Page 2 Mooring Well Installation Work Plan 16 J M Equipment Co Project No 507 2 November 6,2000 ' to Geo Corp Apparently the tanks were installed during the time Quimby operated a John Deere facility and J M Equipment continued to operate them until they were removed ' In April, 1999, responsibility for the adjacent independent trucking facility monitoring wells MW-1, MW-2, MW-3, MW-8 and MW-9 were transferred to J M Equipment GTI also completed site investigation work which included the installation of three additional ' monitoring wells, two hand borings to 15 feet below grade surface (bgs), three soil borings advanced to 30 feet bgs, and one deep boring to 70 feet bgs The three new wells, MW-4 through MW-6, and five existing wells have been monitored quarterly since January 2000 The data indicates that a significant gasoline plume is present in groundwater at the site 2 0 PROPOSED INVESTIGATION The purpose of this investigation is to further define the lateral extent of soil and ground water impacted with gasoline range petroleum hydrocarbons To accomplish this goal, Geological Technics Inc proposes to install two water table monitoring wells, one deep ' monitoring well, and one soil boring Water Table Monitoring Wells The water table wells will be installed to a depth of±30 feet below grade, and will be named MW-10 and MW-11 MW-10 will be located approximately 150 feet northwest of the former UST field, while MW-11 will be located 200 feet southwest of the former UST field Deep Monitoring Well The deep monitoring well will be designated MW-109 and placed near the former UST, in the area of the highest levels of contamination detected in the investigation (soil boring SB- 109, well MW-9) The well will be installed with a short-screened interval (2 5 — 5 feet) at a depth at least ten feet below the lowest depth of detected soil contamination +80 feet The soils at the site are predominantly clays It is proposed that the well screen be installed in a ' silt or sand layer If a silt or sand layer 1s not found, then the well may need to be installed into the clay, which means that a ten-foot screen may be necessary to ensure adequate recharge for purging and sampling r Borehole A single soil boring, SB-6, will be located approximately 100 feet west of the former UST field The boring will be advanced to approximately 35 feet bgs and is intended to further ' define the lateral extent of the soil plume Refer to Figure 2 Site Map for boring/well locations ' 2.1 Monitoring Well Installation The three new monitoring well boreholes will be drilled using an 8-inch outside diameter continuous flight hollow stem auger owned and operated by V&W Drilling (C57# 720904) ' The expected depth to ground water is approximately 13 to 15 feet below ground surface, based on data from the last three quarterly monitoring events Monitoring well permits will be secured as necessary and the local regulatory agency will be notified 48 hours prior to commencing work The subsurface will be cleared of underground utilities by notifying Underground Service Alert See Figure 3 for monitoring well ' schematics