Construction

Issue: 

• S-traps were designed for plant drains

Resolution:

• Field services modified drain piping to accommodate P-traps

Lesson Learned:

• P-traps should be used in design not S-traps

Issue: 

• Wrong type of DI pipe specified for potable water lines

Resolution:

• Ordered the correct pipe during construction

Lesson Learned:

• DI pipe with 401 lining is for sanitary sewer and waste water applications only, if using DI pipe for drinking water must be lined with cement-mortar or porcelain enamel (glass)

Issue: 

• Flanged tee used for A/V valve when saddle tee would have been better

Resolution:

• No resolution applied in this case

Lesson Learned:

• Use saddle tees for A/V valve on large pipe

Issue: 

• Carbon steel bolts used and shipped with structure

Resolution:

• Ordered the correct pipe during construction

Lesson Learned:

• All wastewater steel structures should be assembled with 316 stainless steel bolts

Issue: 

• Body of headworks screen leaked during testing (Screen provided by Saveco)

Resolution:

• Saveco mobilized crew to repair screen body

Lesson Learned:

• Require suppliers to provide QA documents that all equipment has been checked prior to shipping

Issue: 

• 8 1/2 inch long flanged pipe spool was ordered, supplier shipped 8 1/2 foot spool was manufactured and shipped

Resolution:

• Spool had to be re-ordered delaying installation

Lesson Learned:

• Make sure quotes and submittals from suppliers match the order

Issue: 

• Hydropneumatic tank delivery delayed, causing delays in commissioning water treatment plant

Resolution:

• Project delayed, owner had to extend operation of temp plant

Lesson Learned:

• Identify long lead items at beginning of project and check out new vendors with references.