Tenders Are Invited For Ensuring Continuity Of Supply Of Basic Services - Emergency Water Intakes In The Głogów Commune

1. The Subject Of The Order Is The Implementation Of The Task Titled: Ensuring Continuity Of Supply Of Basic Services - Emergency Water Intakes In The Głogów Commune, Divided Into Parts: 1 And 2.2. Planned Scope Of The Task [General Description]: 1) Part 1 - Construction Of Replacement Wells No. 4 And 5: A) As Part Of The Task, It Is Planned To Drill Two Deep Replacement Wells No. 4 And 5 In The Municipal Intake From Quaternary Formations, Located In The Town Of Borek [Dz. No. 581, Borek District, Registration Unit 020302_2 Głogów]. Replacement Wells No. 4 And 5 Are Planned To Be Drilled To A Depth Of 52.0 M Below Ground Level. Each, Using Dry Rotary-Percussion Drilling Technology (Without The Use Of Drilling Mud), In Two Columns Of Steel Casing Pipes (I Column Of Casing Pipes With A Diameter Of 20, I.E. 508 Mm To A Depth Of 22 M Above Ground Level; Ii Column Of Casing Pipes With A Diameter Of 18, I.E. 457 Mm To A Depth Of 52 M Above Ground Level). Replacement Wells No. 4 And 5 Are Planned To Be Filtered With Filter Columns Made Of Pvc-Kv Material With A Diameter Of Dn 250 (Outer Diameter 280 Mm) With The Following Structure (Identical In Both Designed Wells): - Pvc-Kv Dn250 Overfilter Pipe, 34 M Long, With A Passage Of 0.0 - 34 M Below Ground Level; - Slot Filter With A Continuous Pvc Slot Dn250, 14 M Long, 34 - 48 M Below Ground Level; - Pvc-Kv Dn250 Underfilter Pipe, 4 M Long, 48 - 52 M Below Ground Level; - Gravel Filtration Cover, 30 - 52 M Below Ground Level; - Filling The Space Around The Overfilter Pipe, 0 - 30 M Above Ground Level; P.P.T. A Mixture Of Excavated Material And Clay Material (Compactonite), B) The Subject Of The Order Also Includes Carrying Out Hydrogeological Tests And Observations In Replacement Boreholes No. 4 And 5, Including Measurements Of The Position Of The Water Table, Carrying Out Purification Pumping In Both Boreholes (Min. 12 H) And Test Pumping At Three Dynamic Stages (12 H At Each Stage), Collecting 1 Sample Of Groundwater From Each Borehole And Performing Analyzes Physico-Chemical And Bacteriological Properties Of Groundwater. A Gravel (Sand) Backfill Should Be Made Around The Filter With A Granulation Appropriate To The Grain Size Of The Aquifer. After Filtering The Hole, Perform Test Pumping (Cleaning And Measurement) According To The Following Scheme: - Cleansing Pumping, - Disinfection Of The Hole And A 24-Hour Technological Break For Disinfection And Stabilization Of The Water Table, - Measurement Pumping, - 24-Hour Technological Break For Measuring The Rise Of The Water Table. At The End Of Measurement Pumping Of The Holes, Water Samples Should Be Taken For Physical, Chemical And Bacteriological Tests. Correct Results Will Be The Basis For Signing The Final Acceptance Report.