Laserfiche WebLink
Ms. Andrea Alexander <br />February 13, 2020 <br />KERAMIDA Proposal No. P23537 <br />Page 2 <br />SCOPE OF WORK <br />Task '1• Monitoring, ell Installation <br />KERAMIDA will review existing well logs and historic water level data to prepare a final monitoring <br />well placement location map for submittal to IDEM. A draft of the well placement map will be <br />provided to City of South Bend — Environmental Services for review prior to submittal. <br />KERAMIDA will contract with a full -services well drilling company to install two monitoring wells <br />to an estimated completion depth of 70 feet below grade as referenced in the IDEM's review letter <br />dated January 29, 2020. The preliminary proposed well locations are indicated on the attached figure <br />(Figure 1 — Preliminary Proposed Well Location). Well locations are subject to change based on the <br />results of the preliminary hydrogeologic evaluation described above. The selected drilling <br />subcontractor will obtain the necessary St. Joseph County well permits. <br />-3tilit v Clearaiice <br />Prior to initiating the subsurface soil investigation scope of work, KERAMIDA will call in a public <br />utility locate through the Indiana 811 program. A geophysical survey will also be performed in the <br />work areas using electromagnetic (EN) and ground -penetrating radar (GPR) sensors to <br />identify/clear subgrade utilities or structures. KERAMIDA will retain a qualified subcontractor to <br />perform the geophysical survey and will provide oversight and guidance during the performance of <br />the survey. <br />�l��a�il���°iQa � �'°ell la�st<tllatic a� <br />KERAMIDA's drilling subcontractor will advance two soil borings to 5 to 7 feet below the water <br />table utilizing an all -terrain vehicle (ATV) mounted rotary drill. The borings will be advanced <br />utilizing 4 'A internal diameter (ID) hollow stem augers. The augers used on -site will be steam <br />cleaned/pressure washed prior to mobilization to the Site and after completion of soil boring. <br />Borings will be continuously sampled from the ground surface to completion depth using standard <br />split spoons and two -foot drives. A lithology log will be maintained by a KERAMIDA Project <br />Geologist. Upon obtaining completion depth, a monitoring well -constructed of a ten -foot length of <br />two-inch ID polyvinyl chloride (PVC) slotted screen and PVC riser to the ground surface will be <br />installed in the boring. A washed sand filter pack will be placed to two feet above the screen, a <br />bentonite chip seal placed above the filter pack, and a bentonite grout sealing the borehole to the <br />surface. A Pro -Cover and concrete pad will be installed at the surface to protect the monitoring well <br />casing. Two protective bollards will be installed around each well pad. If the protected bollards are <br />determined to be unnecessary, costs will be adjusted accordingly. Once completed, the wells will be <br />developed by surging and pumping with a centrifugal pump. <br />KERAMIDA will prepare a brief report detailing well installation methodology and containing <br />lithologic logs and well construction diagrams for submittal to IDEM. <br />Soil cuttings and groundwater generated during well installation activities will be placed in 55-gallon <br />drums, labeled, and staged on -site. The ground and monitoring well casing tops will need to be <br />