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I' Ile Vacuum Extraction Syste© Vorkplan October, 1992 Firestone Store, 408, H. El Dorado, Stockton, Cb Page b of 8 volatile hydrocarbon capture zone. The y p h final depth of each well will be determined by field screening the soils at the bottom of ' the wells. If soils are stained or emit a strong odor, the well will be extended another five feet. These five foot increments will be extended until either the soil samples are not stained or ' a strong odor me not generated from the soil samples. Two soil samples from each well will be submitted to a certified ' laboratory for the TPH and STEX analysis. One sample will be from between 12 to 16 feet ( based on known soil hydrocarbon profile), or a stained//odorous strata, if encountered, and a second sample will be retrieved at the bottom of each boring. This technique will ' allow faster installation of the system while providing a better vertical and horizontal hydrocarbon distribution pattern. ' Each boring, however, will be logged by a registered geologist and appropriate permits will be acquired from the County prior to installation of the vapor extraction wells. Each well will be screened from the bottom to four feet below ground surface. The annular space will be filled with sand to one foot above the top of the screen. A bentonite and lean cement mixture will be provided to seal the remainder of the well. For the wells within the sidewalk on N. El Dorado St. , a well cap and cover will be provided to protect the well from pedestrian traffic. Within the building, the wells will extend up through the flooring, to allow easier- access asieraccess and maintenance of the wells. Each well will be equipped with a pipe adapter capable of accepting a pressure/vacuum gauge. These adapters will be used during the pilot test to determine vacuum within the sods. These readings will allow determination of capture zone and radius of influence at each well. ' Pioxna. A two inch PVC pipe will be connected to each well. The piping will be provided with a 2 inch ball valve to isolate each ' well from the vacuum manifold. The piping will be connected to the inlet connection of a vacuum pump at the vapor extraction unit. The piping from the wells located in the sidewalk will be buried beneath the concrete sidewalk. The piping within the building will be supported from the floor of the room. Vaipor. _Extraction and Air Treatment Unit. The proposed vapor extraction unit will be provided by XIT Technologies. The unit me mounted on a trailer and comes equipped with an oxidizer, vacuum pump, LEL monitor, strip charts, and a programmable logic controller to control the operation of the unit. Detailed Ryan-Murphy Incorporated ' he Good Earth Company"