1、 3515789 0906780 975 W CEGS DEPARTMENT OF THE ARMY CEGS-02525 (February 1994) U. S. ARMY CORPS OF ENGINEERS . CECW-EG Superseding CWGS-O2148 (February 1994) GUIDE SPECIFICATION FOR CONSTRUCTION Includes Metric Conversion Special Change Includes Special Change to convert CWGS-O2148 (w/N2 Sep 95) to o
2、ne CEGS system and to renumber the specifications in accordance with the 1995 CSI MASTERFORMAT. (September 1998) (September 1998) Includes Changes Thru Notice 1 (September 1998) Includes Special Change to reconcile Reference Organization Names and CEGS-01090 (December 1998) Includes Text Adjustment
3、(December 1998) Latest Change Indicated by Change Tags SECTION TABLE OF CONTENTS DIVISION 02 - SITE WORK SECTION 02525 RELIEF WELLS 02/94 PART 1 GENERAL 1.1 REFERENCES 1.2 UNIT PRICES 1.2.1 Relief Wells 1.2.1.1 Payment 1.2.1.2 Measurement 1.2.1.3 Unit of measure 1.2.2 Pump Tests 1.2.2.1 Payment 1.2.
4、2.2 Measurement 1.2.2.3 Unit of measure 1.2.3.1 Payment 1.2.3.2 Measurement 1.2.3.3 Unit of measure 1.3 SUBMITTALS 1.4 REGULATORY REQUIREMENTS 1.5 PROJECT/SITE CONDITIONS 1.2.3 Pump Installation/Removal 1.5.1 Shop Drawings 1.5.2 Location 1.5.3 Depth of Well 1.5.4 Obstructions Encountered 1.5.5 Well
5、Design SECTION 02525 Page 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- = 3535789 0906783 80% CEGS PART 2 PRODUCTS 2.1 WELL SCREEN 2.1.1 PVC Pipe Screen 2.1.1.1 Couplings 2.1.1.2 Perforations 2.1.2.1 Couplings 2.1.2.2 Perforations 2.1.3 Steel Pi
6、pe Screen 2.1.3.1 Couplings 2.1.3.2 Perforations 2.1.4.1 Couplings 2.1.4.2 Perforations 2.1.2 Fiberglass Pipe Screen 2.1.4 Stainless Steel Well Screen 2.1.5 Tailpipe for Well Screen 2.2 RISER PIPE 2.3 FILTER PACK 2.4 OUTLET FOR RELIEF WELL 2.5 CONCRETE 2.4.1 Check Valve PART 3 EXECUTION 3.1 DRILLING
7、 3.1.1 Reverse Circulation Method 3.1.2 Temporary Casing 3.2.1 Assembly 3.2.2 Joints 3.2.3 Installation 3.2.4 3.2 INSTALLATION OF RISER PIPE AND SCREEN Check for Plumbness and Alignment 3.2.4.1 Plumbness 3.2.4.2 Alignment 3.3 FILTER PACK PLACEMENT 3.4 DEVELOPMENT 3.4.1 General 3.4.1.1 Jetting 3.4.1.
8、2 Intermittent Pumping 3.4.1.3 Surging 3.5 BACKFILLING 3.6 PLUGGING OF ABANDONED WELLS 3.7 TESTS 3.7.1 Pump Test 3.7.2 Sand Test 3.7.3 3.7.4 Reports Filter Pack Sampling and Testing - End of Section Table of Contents - SECTION 02525 Page 2 Provided by IHSNot for ResaleNo reproduction or networking p
9、ermitted without license from IHS-,-,-CEGS DEPARTMENT OF THE ARMY CEGS-02525 (February 1994) U.S. ARMY CORPS OF ENGINEERS CECW-EG Superseding . CWGS-O2148 (February 1994) GUIDE SPECIFICATION FOR CONSTRUCTION Includes Metric Conversion Special Change Includes Special Change to convert CWGS-O2148 (w/N
10、2 Sep 95) to one CEGS system and to renumber the specifications in accordance with the 1995 CSI MASTERFORMAT. (September 1998) (September 1998) Includes Changes Thru Notice 1 (September 1998) Includes Special Change to reconcile Reference Organization Names and CEGS-01090 (December 1998) Includes Te
11、xt Adjustment (December 1998) Latest Change Indicated by Change Tags SECTION 02525 RELIEF WELLS 02/94 NOTE: This guide specification, in conjunction with the contract drawings, covers the use of relief wells, (except materials and equipment specified to be furnished by the Government) to be construc
12、ted near dams or levees to relieve the excess hydrostatic pressures created by the presence of pervious strata close to the surface. This guide specification is to be used in the preparation of project specifications in accordance with ER 1110-2-1200, ER 1110-1-8155. and EM 1110-2-1914. Comments and
13、 suggestions on this guide specification are welcome and should be directed to the proponent of the specification. including their organization designation and telephone number, is at URL http:/www.hnd.usace.army.mil/techinfo/index.htm, and an electronic feedback page for submission of recommended c
14、hanges is available at the same address. Use of electronic communication is encouraged. A listing of proponents, PART 1 GENERAL SECTION 02525 Page 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-35L5789 090b783 684 CEGS NOTE: This specification has
15、 been prepared for use where relief wells are to be constructed near dams or levees to relieve the excess hydrostatic pressures created by the presence of pervious strata close to the surface. Relief wells should be constructed of materials which will resist corrosion when installed and should, wher
16、e practicable, be designed to have a service life equal to that of the structure they are designed to protect. Factors to be considered in determining selection of material for wells are: 1. Operating conditions of wells, 2. Corrosive characteristics of soil and water, 3. Method of installations, 4.
17、 Size and depth of wells, 5. Type of joints, and 6. External pressures on well casings. The riser pipe and screen should be designed in all cases to withstand, with a suitable factor of safety, the crushing pressures at depths to which wells extend. Design of relief wells to be constructed under str
18、uctures must consider loads that will be induced into the well pipe due to structural settlement. The wells, including screen and riser pipe, should have a diameter which will permit the maximum design flow without excessive head losses but in no instance should the inside diameter be less than 150
19、mm (6 inches). Based on design parameters it may require the designer to include a minimum collapse strength for the pipe and well screen and a minimum clear inside diameter through the fittings and screen to allow the installation of pumps at a later date. Because of the large variation in design a
20、nd wall thickness of the different types of well screen, no generic specifications have been included. For large contracts, specific necessary characteristics should be presented in detail. References to manufactures should be eliminated. Information on the design of filter packs and relief wells ca
21、n be found in the Engineering Manual EM 1110-2-1901, “Seepage Analysis and Control for Dams“. The filter criteria specified in EM 1110-2-1901 should be used to determine the gradation band of the filter material. To minimize segregation during installation of the filter pack, the filter should have
22、a relatively uniform grain-size distribution band. the filter material should be more or less parallel to the gradation curve of the material being The gradation band of SECTION 02525 Page 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- 3515789 09
23、0b784 510 CEGS drained. curve should be greater than 25 times the corresponding size of the material being drained. NO point on the coarser filter gradation The filter material should have a minimum thickness of 150 mm (6 inches) measured radially from the outer circumference of the screen section,
24、and its gradation should depend upon the gradation of the strata being drained. Where unusual conditions are encountered, filter tests should be performed in the laboratory using the foundation sand and the selected filter. For examples of laboratory investigations refer to Technical Report GL-87-22
25、, dated August 1987, l1Laboratory Tests on Granular Filters for Embankment Dams (Includes Appendixes A-E)“; and Technical Memoranda (TM) 183-1, dated Nov 1941, Rev Dec 1941, lInvestigation of Filter Requirements for Underdrains“; and Technical Memoranda (TM) 195-1, dated Oct 1942, “Field and Laborat
26、ory Investigation of Design Criteria for Drainage Wellsg1, U. S. Waterways Experiment Station. Because of the high potential for clogging by migrating fines or chemical precipitate, filter cloth should not be used to protect relief well screens. In adapting this specification to any project the form
27、 and phraseology should be changed as necessary to properly specify the work contemplated. Changes should be made in the original form to the extent required to adapt the guide specification to local conditions. Work such as concrete for backfill, painting of exposed metal surfaces and seeding of co
28、nstruction areas will have to be specified in this section when such sections cannot be referenced as a part of the contract. For projects on which subsurface information is not sufficiently developed to permit detailed design of each well, a section should be added to the specifications requiring t
29、he drilling of a small diameter pilot hole at the location of each well. Pilot holes should be sampled and logged in sufficient detail to define the gradation of pervious zones and the depths between which screens should be set. The specifications should require that samples of pervious materials be
30、 taken at 750 mm (2.5 foot) intervals of depth. Grain-size distribution tests should be performed to provide a basis for the design of the filter pack and the screen openings. Samples taken by fishtail drilling and other wash boring methods will not be permitted. obtained is sufficient, pilot holes
31、are not required. Where the subsurface information previously SECTION 02525 Page 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3535789 0706785 Li57 CEGS 1.1 REFERENCES NOTE: Issue (date) of references included in project specifications need not b
32、e more current than provided by the latest change (Notice) to this guide specification . The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by basic designation only. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)
33、 ASTM A 53 ASTM A 312/A 312M (1996) Pipe, Steel, Black and Hot-Dipped, Zinc-Coated Welded and Seamless (1995a) Seamless and Welded Austenitic Stainless Steel Pipes ASTM C 33 (1997) Concrete Aggregates ASTM C 94 (1997) Ready-Mixed Concrete ASTM C 136 ASTM C 387 (1996a) Sieve Analysis of Fine and Coar
34、se Aggregates (1995) Packaged, Dry, Combined Materials for Mortar and Concrete ASTM D 75 (1987; R 1992) Sampling Aggregates ASTM D 297 (1993) Rubber Products - Chemical Analysis ASTM D 412 ASTM D 1056 ASTM D 1784 ASTM D 1785 ASTM D 2466 ASTM D 2467 ASTM D 2564 (1997) Vulcanized Rubber and Thermoplas
35、tic Rubbers and Thermoplastic Elastomers - Tension (1991) Flexible Cellular Materials - Sponge or Expanded Rubber (1996) Rigid Poly(Viny1 Chloride) (PVC) Compounds and Chlorinated Poly (Vinyl Chloride) (CPVC) Compounds (1996b) Poly(Viny1 Chloride) (PVC) Plastic Pipe, Schedules 40, 80, 120 (1997) Pol
36、y (Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 40 (1996a) Socket-Type Poly (Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 80 (1996a) Solvent Cements for Poly (Vinyl Chloride) (PVC) Plastic Piping Systems SECTION 02525 Page 6 Provided by IHSNot for ResaleNo reproduction or networkin
37、g permitted without license from IHS-,-,-ASTM E 11 CEGS (1995) Wire-Cloth Sieves for Testing Purposes ASME INTERNATIONAL (ASME) ASME B1.20.1 (1983; R 1992) Pipe Threads, General Purpose (Inch) ASME B31.9 (1996) Building Services Piping 1.2 UNIT PRICES NOTE: If Section 01270 MEASUREMENT AND PAYMENT i
38、s included in the project specifications, this paragraph title (UNIT PRICES) should be deleted from this section and the remaining appropriately edited subparagraphs below should be inserted into Section 01270. 1.2.1 Relief Wells 1.2.1.1 Payment Payment will be made for costs associated with relief
39、wells, which price shall constitute full compensation for construction of relief wells. Wells ordered abandoned by the Contracting Officer before installation of well screen and riser due to no fault of the Contractor will be paid for at - percent of the contract unit price per linear meter foot, fo
40、r Bid Item No. 3 “Relief Wells“. Wells ordered abandoned by the Contracting Officer due to no fault of the Contractor shall be paid for at the full contract unit price for Bid Item No. “Relief Wells“. No payment will be made for placement or replacement of temporary casings or repair of damage resul
41、ting from Contractor operations. No separate payment will be made for relief well screen, riser, check valves, gravel pack, development, backfill, discharge or outfall pipes. No payment will be made for any wells that, in the opinion of the Contracting Officer, are abandoned due to Contractor fault
42、or neglect. 1.2.1.2 Measurement Relief wells will be measured for payment by the linear meter foot of completed well between ground surface and 300 mm 1 foot below the bottom of the well screen tail pipe. Wells ordered abandoned by the Contracting Officer, due to no fault of the Contractor, will be
43、measured for payment. 1.2.1.3 Unit of measure Unit of measure: linear meter foot. 1.2.2 Pump Tests 1.2.2.1 Payment Payment will be made for costs associated with pump test, which price shall constitute full compensation to perform a satisfactory pump test as specified. No payment will be made for pu
44、mp test not successfully SECTION 02525 Page 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CEGS completed. 1.2.2.2 Measurement Pump tests will be measured for payment for each hour, measured to the nearest 15 minutes, of pump test successfully per
45、formed as specified in paragraph PUMP TEST, and as otherwise directed. Testing time will not include time required to place and remove testing and pump equipment. 1.2.2.3 Unit of measure Unit of measure: per hour. 1.2.3 Pump Installation/Removal 1.2.3.1 Payment Payment will be made for costs associa
46、ted with installation and removal of the pumps used in pay item “Pump Tests“. No payment will be made for pump installation removal where pump test was not successfully completed. 1.2.3.2 Measurement Pump installation/removal for pump test will be measured for payment on the base of the applicable c
47、ontract unit price per relief well pump tested. 1.2.3.3 Unit of measure Unit of measure: each. 1.3 SUBMITTALS NOTE: Submittals must be limited to those necessary for adequate quality control. The importance of an item on the project should be one of the primary factors in determining if a submittal
48、for the items should be required. Indicate submittal classification in the blank space using liGAof when the submittal requires Government approval or llFIOol when the submittal is for information only. Government approval is required for all submittals with a “GA“ designation; submittals having an
49、“FIO“ designation are for information only. The following shall be submitted in accordance with Section 01330 SUBMITTAL PROCEDURES : SD-04 Drawings Shop Drawings; GA. Submit shop drawings. SD-08 Statements SECTION 02525 Page 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-= 3535789 070b788 3bb = CEGS Well Screen; GA. Before installation, a
