6.14 Subcontractor warrants that / Субподрядчик гарантирует, что:
a. it has not used or specified and will not use or specify for use;
b. it has exercised and will continue to exercise reasonable skill, care and diligence to see that they are not used;
c. it is not aware and has no reason to suspect or believe that there have been or will be used; and
d. it will promptly notify ** in writing if it becomes aware or has reason to suspect or believe that there have been or will be used;

вот предыдущая статья:
6.13 Each item of the Supplies shall be deemed to be the property of **, on the earlier of i) the delivery of such item of the Supplies to Site, or ii) the entitlement of the Subcontractor to the payment of the value of such item of the Supplies. The Subcontractor shall not remove any part or parts of the Supplies from the Site without the written consent of **, including any materials which may be left-over at the end of the Works. / Каждый элемент ТМЦ считается собственностью компании ** на ту дату, которая наступит ранее а) поставки этого элемента ТМЦ на строительную площадку, или б) права Субподрядчика на оплату стоимости такого элемента ТМЦ. Субподрядчик обязуется без письменного согласия ** не вывозить часть или части ТМЦ, включая те материалы, которые могут оставаться при окончании работ.

и последующая часть статьи 6.14
in or in connection with the Works, any of the materials or substances identified as follows:
i) high alumina cement in structural elements;
ii) wood wool slabs in permanent formwork to concrete;
iii) calcium chloride in admixtures for use in reinforced concrete;
iv) asbestos products except (with ** consent in writing) in mechanical or electrical equipment where their use cannot reasonably be avoided;
v) Materials known as carcinogenic hazards; and
vi) any others generally known in the construction industry at the time of use to be deleterious if used or incorporated in the Works.

Вместо:
Субподрядчик гарантирует, что:
а. Субподрядчик не использовал и т.д. ...

написано:
Субподрядчик гарантирует, что:
а. он (it) не использовал и т.д. ...