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i 14 Utility Investigation IPrior to conducting any field work, a survey of the site will be conducted to safeguard that subsurface utilities are not intercepted during the on-site activities The survey will be conducted ' using magnetic and electro-location methods Additionally, Underground Service Alert (USA) will be notified to locate off-site underground utilities 1 5 Site Restoration IAll construction debris shall be removed from the site daily and the premisses left in a clean condition The contractor shall restore the site to a condition equivalent to that existing prior to ' the start of work ' 2 0 TECHNICAL PROVISIONS ' 21 Protective Well Covers and„Wellhead Completion The existing vapor extraction wellhead covers shall be removed so that the wellheads can be modified to accommodate the underground vapor extraction piping Care should be taken not to damage the well casing or sanitary seal during the construction activity The 4-Inch diameter vapor extraction wells will require that a 4x4x2-Inch "T" fitting be Installed to connect the wells to 2-inch diameter schedule 40 polyvinylchloride (PVC) piping and still allow access to the well casing (Figure 3) Once the connection is completed, a 12-Inch diameter traffic-rated protective Iwell cover will be Installed in concrete and placed in a level position 1/2 inch above firushed grade with 4-6 inches of concrete sloped away from the well Neat cement shall be poured In the interior of the well cover to approximately 6-inches below ground surface (bgs) to protect the piping connections and restore the sanitary seal for each well I 22 Trenching and Underground Piping Installation IThe contractor shall excavate trenches from each of the soil vapor extraction wellheads to the treatment compound to contain the soil vapor lines vapor lines The trenches will be located 1434VES ICU 2 SECOR Job No NOOO$.W2-1I March 13 1995