,MCDERMOTT,
Exhibit A - Scope Of Services
Gas Holder Inspection
Decument Title: Document No. Rev:
Inspection Plan for Gas Holder 239822-000-SP-PL-00001 6
1.0 INTRODUCTION
2.0
3.0
4.0
4.1
4.2
This inspection plan identifies the scope of the work to be performed by CB&l Services, LLC (CB&I) to
evaluate the state of the 9400ff* gasholder located at City of Nashua Wastewater Treatment Facility in
Nashua, New Hampshire. This tank was originally constructed by CB&l in 1999.
PURPOSE
The purpose of the inspection is to provide technical support to prepare the gasholder for inspection and
possible repair.
The on-site technical support will be performed in accordance with industry standards and CB&l
requirements. Ali support work will be performed by qualified individuals, and the evaluation performed by
a professional engineer experienced in AP] 650 aboveground tanks.
REFERENCES
The following references will be utilized for the inspection and subsequent report:
API 650 Welded Tanks for Oil Storage
API653 Tank Inspection, Repair, Alteration, and Reconstruction — Fourth
Edition Addendum 3 November 2013
PREPARATION OF GAS HOLDER FOR INSPECTION
Prior io CB&/i Personnel Arrival
The following steps are to be completed by others prior to the arrival of CB&I on site:
Gas holder is to be cleaned and certified gas free
Safe access around the tank provided
Elevation of the piston is in the maintenance position
Remove ail bio-solids and sludge buildup that may be present under the piston
Physically isolate the tank from the balance of plant
Prior to Inspection Start
The following steps are to be completed by CB&I prior to the start of the inspection:
* Personnel to use appropriate PPE: Hard Hats, safety glasses, gloves, safety toed boots, long sleeve
shirts, and long pants
° Check isolation plan
* Confined Space Entry:
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