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i <br />' calculated based upon the remaining airspace, airspace utilization, and the anticipated rate of <br />waste disposal. <br />t The life expectancy will be compared to the projected time frame for completion of the <br />permitting, bidding, and construction of the piggyback landfill expansion to monitor for any <br />' potential gap in the availability of permitted disposal airspace. <br />CDM has not included the survey costs within the budget for this task. CDIv1 will coordinate <br />' with the surveyor; however, we assume that the County will be responsible for the survey costs. <br />TASK 3 - SITF/DESIGN HYDROGEOLOGIC REPORT AND GEOTECHNICAL <br />' EVALUATION <br />The purpose of this task will be to provide information regarding the geologic, hydrogeologic, <br />and geotechnical characteristics of the proposed C&D landfill expansion area. This information <br />will be used to prepare a Site Hydrogeologic Report for the overall C&D landfill footprint <br />' (includes all potential future disposal areas) and a Design Hydrogeologic Report for the next <br />phase (piggyback expansion} of C&D landfill development. <br />' Task 3.1-Prepare Boring Plan <br />CDM has developed a preliminary subsurface investigation boring plan to address Rule <br />.0538(a)(~} and (b)(1)(A) in order to estimate costs. Prior to initiating the field work, CDM will <br />' meet with the SWS to review and discuss the proposed boring plan. The scope of work <br />presented herein is based on meeting the requirements of Rule .0538(a)(1 through 13}and (b)(1 <br />and 2) and preliminary discussions with the SYVS. Adjustments in the proposed scope of work <br />' may be necessary depending on subsurface conditions encountered during the field <br />investigation. <br />' Task 3.2 -Subsurface Investigation <br /> Based on the preliminary boring plan under Task 3.1, CDM will contract directly with a drilling <br /> subcontractor to perform hollow-stem auger {HSA) and rock coring work. The work to be <br />' provided by the driller will include the following items: <br /> ^ CD1vI estimates that there will be six HSA borings with Standard Penetration Tests (SPT) <br />' totaling 350 feet. The information collected from all of the HSA borings will be used to <br /> identify the soil lithology, determine the depth to bedrock, and collect soil samples for <br /> laboratory analysis. Two borings will be rock cored a total of 10 feet each. <br /> t <br />350 f <br />l <br /> . <br />ee <br />ing <br />^ CDNi estimates that a total of six piezometers will be installed, tota <br /> Following installation, each piezometer will be developed and completed with a locking, <br />' 4-inch, above grade steel protective cover. Only HSA borings and rock core holes that <br /> encountered groundwater above bedrock will be converted to piezometers. CDM <br /> assumes that all borings will encounter groundwater above bedrock. <br /> l <br /> es. <br />^ piezometer sampling will include collection and analysis of six groundwater samp <br /> CDNI currently monitors existing ~~ells CD-4, CD-5, and CD-6 as part of the Assessment <br />' for the Closed Unit II/III landfill. It is anticipated that the Solid Waste Section will <br /> require collection of groundwater samples from the new proposed piezometers located <br /> between the existing C&D and the closed landfill, upgradient of the closed landfill, and <br />' <br /> 3 <br />Item# 9 <br />' Attachment number 1 <br />Page 87 of 185 <br /> F-5 <br />