indiana awwa conference - structurepoint

February 11, 2014

Presenters: Paul Johnson, LPG Dustin Graves, LPG, CHMM

Indiana AWWA Conference

Key Responsibilities of the Designer During

Well Construction

Summarize general designer responsibilities during project construction Construction

Administration Resident Project

Representative Outline critical observation

and analysis tasks during production well construction

Review post-construction tasks Regulatory submittals Operation & Maintenance Warranty inspections

Construction projects benefit from a collaborative process Designer Verify design concept is implemented Provide interpretation of design concept

Owner Provides technical expertise Minimize changes, delays and disputes

Contractor Collaborate on alternatives Understand objectives

Construction Administration (CA) Consult with Owner Generally administer the construction contract

Resident Project Representative (RPR) Full or part-time on-site throughout construction Reviews and monitors schedule Conducts regular project status meetings Verify materials and quantities Maintains records Regular inspection of the Work

General Contract Administration Pre-Construction Conference Schedules Site Visits Clarifications, Field Orders Change Orders Shop Drawing Review Applications for Payment Substantial Completion/Final Acceptance

General Consult with Owner Serve as Owner’s representative Independent testing

Pre-Con meeting Participate in Pre-Construction conference

Schedules Review and determine acceptability Progress schedule Schedule of Submittals Schedule of Values

Baselines and Benchmarks Establish for accurate location of work

Site Visits Intervals appropriate for stages of construction Observe progress and quality Not exhaustive or detailed inspections Keep owner informed of progress Verify contractor has implemented and maintained

the integrity of design concept

Supervise, direct or control contractor’s work

Provide authority or responsibility for means, methods, techniques, sequences or procedures

Responsibility for site security or safety

Compliance with laws or regulations, including permit conditions

Defective Work Recommendations to Owner to reject Contractor’s

Work while in progress Clarifications, interpretations, and Field Orders

Respond to inquiries by contractor (RFIs) Authorize minor variations

Change Orders & Work Change Directives Review and recommend COs and WCDs to Owner Prepare COs/WCDs for Owner approval

Shop Drawings and Samples Review and evaluate shop

drawings/samples Conformance with Contract

Documents and compatibility with design concept

Review must comply with Contractor’s submittal schedule

Does not include partial submissions

Substitutes and “or equals” Evaluate and determine

acceptability

Inspections/Tests Require special inspections or tests as necessary Review certificates of inspections, tests and

approvals Purpose is to determine results indicate compliance

with Contract Documents Disagreements between Owner and Contractor

Render written decisions Acceptability of Work and interpretation of Contract

Documents Shall be fair and impartial

Applications for Payment Determine amounts recommended to be paid Recommendations work has progressed Quality of work Determine final quantities and classifications

Completion Documents Receive, review and transmit to Owner O&M Manuals, schedules, guarantees, bonds, etc. Annotated record drawings (from Contractor)

Substantial Completion Conduct inspection of work Prepare (or review) Punch

List Prepare Certificate of

Substantial Completion Final Notice of Acceptability

Conduct final inspection of work

Prepare recommendation of final payment

Prepare “Notice of Acceptability of Work”

Other tasks

Pre-Construction Coordination

Site Visits Drilling Development Testing

Submittals Evaluation

Schedules Test drilling

Pilot holes needed? Sieve analysis Drilling method Final screen design

Utility Location Indiana811 Private locates

Project phasing

Test Drilling Drilling

Frequency depends on method

Verify formation Sampling

Development Testing

Step-drawdown Constant rate

Observe drilling work Verify formations encountered

Verify materials conform to specifications and submittals Casing Screen Gravel pack (if included)

Observe Pre-Development work Thinning mud (if applicable) Air-surging

Grouting

Critical stage of construction Methods (from: Driscoll, 1986)

Over-pumping (“Raw-Hiding”) Back washing (gravity/tank surge) Mechanical surging Air surging and pumping High velocity jetting (air or water)

Use of Development Aids (Chemicals) Polymer dispersants (Non-Phosphate) Surfactants (Non-Phosphate) Chlorine Others

Verify method(s) and effort

Sand content “Jar Test” surge

discharge Sand sampler, Imhoff

cone Provide assistance as

needed

Select monitoring points and frequency

Determine rate for constant rate test Based on step-test

results Review discharge

conditions Collect samples

Sand Water Quality

Review data

Well Proposed well design Screen slot size Placement in well Grout

Gravel Pack Supplier Sieve analysis

Plot updated for well record (log)

IDNR Log

Pump and Motor Preliminary pump set

sheet Specifics of pump,

motor, column or drop piping

Pump head Pump curve

Pumping test data Typed tabular

summary of tests Static water level Pumping levels Orifice measurements Discharge rate

Step and constant rate Bacteria testing

Plumbness and Alignment Evaluate whether in compliance with specifications AWWA Standards

Pumping Test Adjustments to pump assembly Flow rate, TDH, motor horsepower, and pump

setting depth Evaluate efficiency

Compile regulatory records Well records (IDNR form) Water quality analysis GWUDI analysis

Prepare as-built plans/records Post-completion inspections

Initial operation Prior to warranty expiration

Develop or update Wellhead Protection Plan Delineation Overall plan

Maintenance schedule Expansion potential

Emphasizes collaboration Designer, Owner and

Contractor Design contract

include construction phase services

Benefits to all parties Incorporate post-

construction tasks