Common use of CONCEALED CONDITIONS Clause in Contracts

CONCEALED CONDITIONS. SHOULD CONCEALED OR UNKNOWN CONDI- TIONS BELOW THE SURFACE OF THE GROUND OR CONCEALED OR UNKNOWN CONDI- TIONS IN AN EXISTING STRUCTURE, BE ENCOUNTERED WHICH ARE AT VARIANCE WITH THE CONDITIONS INDICATED BY THE CONTRACT DOCUMENTS, OR BE OF AN UNUSUAL NATURE, DIFFERING MATERIALLY FROM THOSE ORDINARILY ENCOUN- TERED AND GENERALLY RECOGNIZED AS INHERENT IN WORK OF THE CHARACTER PROVIDED FOR IN THIS CONTRACT, CONTRACTOR SHALL GIVE IMMEDIATE WRITTEN NOTICE THEREOF TO OWNER AND THE CONTRACT SUM SHALL BE AMENDED BY CHANGE ORDER UPON CLAIM BY EITHER OWNER OR CONTRACTOR WITHIN SEVEN (7) DAYS AFTER THE FIRST OBSERVANCE OF THE CONDITIONS.