Geomembrane Design

ISO 9001:2000 Geomembrane Installation Weather Constraints

Measuring of Work
As part of the company's QA procedures all materials are measured after cutting to shape prior to welding. These figures are checked regularly against the area covered and form the basis of the final measurement.

Contract Price - Measured Work
Unless stated otherwise, the contract price is based on the surface area of material laid including materials in anchor trenches but excluding weld overlaps.

Contract Price - Fixed Prices
The price is based on the areas shown on the drawings and agreed prior to contract. Small variations in area will not incur extra costs.

Weather
Lining cannot be positioned at times when wind speed exceeds 10 km/hr and lining cannot be welded in damp conditions (mist and rain) or when material temperature falls outside the range 4°C to 30°C. Therefore, work rate can be severely affected by inclement weather. Whilst our costs of weather caused delay are for our account contract time extensions will be claimed.

Site Conditions
All civil engineering work including dewatering is the responsibility of others unless otherwise agreed in writing.

Should our works be delayed due to lack of suitable ground on which we can lay material, the time lost will be classed as standing time irrespective of weather conditions and the costs of such delay will be charged under our dayworks arrangements and extension of time claimed.

Repairs
Any repairs or rework incurred due to damage caused by others will be carried out by our operators and charged under our dayworks arrangements. Any extra civil engineering work required shall be carried out by others at no charge to Butyl Products Limited.

Programme
We will programme the works in accordance with the original agreed schedule. Please advise us of any programme changes. Whilst we will endeavour to meet any changing schedule we will normally require 10 working days notice of any changes.

Quality Assurance
It is a requirement of ISO 9002 that we receive full written instructions with the order a minimum of 2 weeks before any work is undertaken.

Working Week
Where possible we would wish to work 7 days per week on alternative weeks. This time is helpful in pulling back time lost to bad weather and reduces the time lost travelling to/from site.

Attendance
The unloading of materials on site shall be carried out by others (MACHINE REQUIRED) at no cost to Butyl Products Limited. Free assistance may be required for machinery and/or labour to assist in unrolling materials for cutting and placing it in position.

Dayworks
Any extra works required resulting from site instruction, changes, repairs and standing time will be charged as dayworks unless previously agreed otherwise. Site instructions are recorded on our "Confirmation of Verbal Instruction Form" and shall be signed by the main contractor/client and our site foreman. (The form is produced in duplicate, one copy for site and one copy for our permanent records.)

Daywork Rates - Based on Civil Engineering Contractors Association Schedule of Dayworks
One technician with welding equipment and consumables, inclusive of subsistence and overheads at £44.00 per man hour. Travel to and from site, plus standing time will be charged at £38.00 per man hour. Daywork hours, materials used and description of work are recorded on our Dayworks Sheet. On completion of the dayworks this shall be signed by the main contractor/client. (The form is produced in duplicate, one copy for site and one copy for our permanent records).

Completion Period
As our works are very dependant on weather and site conditions, with the ground preparation normally being carried out by others, any contract period agreed will be based on full production days of work.

Completion Certificate
A Completion Certificate will be issued on the completion of the works. This should be signed by the contractor/client when he is satisfied that the works are complete and is happy for us to leave site.