462. Failure to examine site, foundations, etc.

If an architect or engineer fails to exercise reasonable care in the examination of the site on which the works are to be constructed, and does not ascertain the circumstances affecting it, such as the nature of the soil and strata, the existence and condition of buildings, whether there are rights of way or of light and air, or other easements affecting it, and consequently his designs are defective or impracticable, he may be liable to the employer for any loss thereby occasioned to him