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initial well redevelopment byow8bbing and airlifting is an <br />extremely important component Ofthe wall redevelopment <br />process. GE45CIENCE antidpatesthat at host 60 hours. <br />ofradirvekrpi pntbyswabblrrgandairliftingw€db& <br />necesparyto pj'dpafly remove and neutralizethe:ehefnleais <br />Introduced In Tesk 4.5, and to radayelop the filter pack <br />and near well zone, GEOSOIENCE will provide partfime <br />Inspection dudngthe airlift development process and <br />will cipsoly;monitor discharge watertorbidity awksand <br />content,to track the development progress of the well. <br />GEOSCIENCe will coreftiliy fellowsand concentrations <br />withinthe.disohorge throughout tha'proOM'and will <br />provide direction to the Cohtradttir should particular 01`086 <br />orthe screen require additional ork to reduce the sand to <br />a niinirtrum. <br />a. Final Rar£levelnprneht by Pumping and Surging. <br />Final redeveloprantbypumpingand surging is a <br />particularly important part .0f the redevelopment process <br />and raqufres close. monitodng of WME iovel 000discharge <br />data as waif as sand content. GEOSGIENCEwili monitor <br />final.develppmonton a part-time basis. Teats for sand <br />coniamand specifb capacity will be,perfommed.frequently <br />to measure the edvahoement of the development process <br />and to ensure that the Well is fully developed before <br />beginnfn,g the .aquirer Pumping:tesu. GEOSCIENCE <br />anticipates that a minimum or 40 hours will be nacessery <br />for thorough redevelopment. <br />f. Step Drawdown and Constant Rate Pumping Tests <br />Once final redevelopment Is determined to be complete, <br />pumping tests will be performed on the wail to determine <br />any changes to well and aquifer chaeactenstlas and to <br />document send readings over time from start of pumping. <br />Recovery measurements should be collected for a <br />minimum of four (4) hours following the eonatant rate <br />pumping test. The recommended aquifer pumping tests <br />aro as follows: <br />• step Drawdown Pumping Testa -to determine <br />specific capacity and well efficiency relationships. <br />Typically three to four rates ate selected for pumping, <br />beginning at the lowest rats and working up to the <br />highest. <br />Constant Rate Pumping Test Sc Recovery ?oat -time <br />drawdown and recovery measurements will be <br />made to. determine aquifer parameters such as <br />transrissivity and 6torativity. It is 'recommended that <br />the constant rate test be conducted for 24 hours with <br />4 hours of recovery measurements, <br />r1_:0=r_NCE will erovide full-time inspection during the <br />step drawdown test and part4ime inspection during the <br />24-hour constant raftAnd r800varytesL <br />g. PosMedevelopment Doi nhols Video Sur VWy0nd Well <br />Disirdediion <br />itis recommended that a dual -scan downiiolev1d60Vrvey <br />be conducted within the well following redevelopment and <br />testingto serve 90 record of the post -redevelopment <br />oondition of the wall OslnE rmd soreen. GEO$CleNQE will <br />providwfull4lme Inspection dudtigth6videcsu". <br />The wail should be disinfected as soon as r0dave100meM <br />and gquift>i'.pumpfng iasis 1havebean pertor ned.'Astrong <br />chlor€nesolutidn should beadded to.thewall following <br />removal of the test p�urrfpto obtains required -minimum <br />concentration of 200 rraii[grafins per liter ffragTLjfree <br />chlorine conoentretion. GEOSCIENCEwin phnic 44full:tiine <br />inspeadendwell disinfection toensairethat hePMPdr <br />concentrators of chlorinre used andthatthe chiarine <br />is propany injected ara <br />d and.d(spersod within the wail. <br />0..Prtpore sulowary letter report. <br />At the ooncdusion:.of rehabEtrtatipn.Act€vftits, GECSCIENCE. <br />Will preparaz letter report in 100FINAL format that <br />summarizes the details of the redevelopment and testing <br />process. The report wro, at a minimum, include the <br />fallowing: <br />• Pro -redevelopment well condhidn, <br />• Ohronologyoractivitles, <br />• Description of methods uaad during wall <br />redevelopment, <br />• Well redevelopment results and postredevelopment <br />well condition, <br />• Ana"s and results or aquifer pumping tests, and <br />• Other pertinent date, analytical results, <br />recommendations and oanclusions. <br />Water and Sewer Pipeline Design <br />TASK I - PROJECT ADMINI STRATION <br />Prior to the start of the project, We will have a kickoff <br />meeting with City staff and the projeatteam to review the <br />project objectives, schedule, the scope and approach. <br />At this meeting, we will establish a point of contact for <br />the project and request.all available information related <br />to the project. In addition, the NV6 Project Manager will <br />coordinate all aspects of the project and manage the <br />schedule and waste ensure the project's completion to <br />the satisfaction of the City. <br />TASK 2 - RESEARCH EXISTING CONDITIONS <br />I <br />25E-450 <br />