WORK PLANS - Laserfiche WebLink

Home Browse Search

ENVIR Pagelt ENVIR Page 12 March 24,2020 Munch 24,2020 A59ESSMENT, PC Project Number 2020-03-011 ESSMENT, PC Project Number 2020-03-011 Well Completion,Developmmt.and Survey The proposed soil boring will be completed as a single ground water monitoring well.The well GROUND SURFACE will utilize 2-inch diameter Schedule 40 polyvinylchloride (PVC) blank well casing and 0.020- Ctue pad,-2-foot diameter.sloping away stovepipe well seed veldt from.e comer. inch slotted well smem from 55 feet to 75 feet BGS.After installing the well casing in each pilot PVC well casing,Nnch cameter, boring,a filter pack material consisting o£pre-washed H2/12 sand will be added through the augers d fllahthrPa vanablelapershda- peWingon bonngdepthand m from total depth to approaiarely 1 to 2 feet above the screened interval.Following placement of 2'BGS anckvp. the filter pack,the well will be surged to assist in settling the filter pack additional and will be cr Grout Hi .,3 gMI.potable waterforeach 47 added if settling occurs.A nominal 1 to 2-foot bentonite chip will be placed above the filter pack J Ibe Portlmidcement. to minimize the potential for grout penetration into the screened section of the wells.The bentonite seal will be formed by pouring bentonite chips into the annulus and allowing them to settle on the filter pack The heartache will be allowed to hydrate for a minimum of%-hour prior to grouting. The remaining annular space will be filled to within I foot of the ground surface with a cement grout The grout mixture will consist of Type MI Portland noun cement and not more than 3 gallons of water per47-pound sack of cement.Following installation,each well will be developed to max- SGBGs imize water flow and minimize the amount of fine-grained sediment drawn into the well during 53'BGS �_ Bentunite seal. pumping or bailing. 1 to 3 feet thick 55'BGS — PVC well screen.2-inch diameter. Health and Safety 17 flush thread 20 toot length At least 48 hours prior to any digging az the site,Dig Alert is to be contacted so that the utilities to7o bp could be marked prior to start of work.Prior to start of work a brief"tailgate safety meeting"will conducted in inform the field crew of anticipated hazards and the emergency action plan for the Send pack site. _ eMends app.l to 2 feet above will screen Well Development Development will not be performed until at least 48 hours after the sanitary seal has been placed n'bGs Nomtiuepth 75 feet BGL onng; in the well. Development proposed g Target depth 75 feet BGL. pmmt of the ro osed wells will consist of a combination of Bailin with a PROPOSED MONITORING stainless steel bailer to remove the major portion of fine-grained sediment from inside the well, WELL DESIGN surging to flush out or draw in sediment from the filter pack,and additional ground water evacua- tion with a whaler pump to finish the removal of fine-grained sediment Developmental purging ENVIROASBES6NIENI.PC ENVatONM1IDVTAL.t]VGWFFanIn.OEOLOGY ENVBtOASBEase4Nr.PC ENVntOMAEMpL ENGaJEER240 CORD:PDBO%1156.WPOTEItS FERRY.m83805 MONE (8e4)]42-1311 FM(M)623393 co"POBOC iiU.BoeMpRS FERRY.an83805 PHONE GEOLOGY (8141]42-]311 FA%(Br136U-5493