Laserfiche WebLink
III. INSTALLATION OF A VAPOR OBSERVATION POINT IN THE <br /> EXCAVATION <br /> Install a vapor observation point at the bottom of the excavation so as to <br /> provide an opportunity to monitor the TPH vapor levels in the soil. <br /> Install a length of four-inch diameter slotted PVC well screen sealed at one end <br /> in the bottom of the tank pit within the washed gravel <br /> Attach a PVC elbow with a PVC riser to the open end of the well screen <br /> Complete the observation point at ground surface with surface protection such <br /> as a Christy' box <br /> VM111894 CAP <br /> 7 <br />