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� CAMBRDA <br /> Contractor Sustainable Technologies Inc of Alameda, California (Contractor's <br /> License#772329) <br /> Excavation The GWE system design drawings are presented as Attachment A All <br /> trenches were backfilled with native soil (except for the trench for the <br /> sewer discharge pipe) and compacted Field personnel noticed a <br /> petroleum hydrocarbon odor emitting from excavated soil from the sewer <br /> discharge pipe trench The excavated soil was stockpiled on visqueen, <br /> sampled, covered, profiled, and disposed at a proper facility Clean fill <br /> material was used to backfill the trench All trenches were resurfaced to <br /> match the existing surface <br /> Piping Installation A four-inch diameter discharge pipe was installed from the remediation <br /> compound to an existing sewer lateral, on the east-side of the station <br /> building The discharge pipe was installed approximately 18 inches <br /> below grade, at i/a-inch slope towards the existing lateral <br /> • A three-inch PVC conduit was installed from the electrical service pole <br /> to the electrical service meter and panel within the remediation <br /> compound This conduit accommodates electrical service wire to power <br /> the GWE system Conduit and electrical service installation was done in <br /> accordance with PG&E specifications, and approved by the City of <br /> Stockton and PG&E <br /> Equipment Installation All equipment, except the groundwater pump, is located within the <br /> remediation compound, behind the station building Groundwater is <br /> extracted from well RW-IA using a QED Environmental Systems, Inc , <br /> four-inch Solo 2 submersible pneumatic pump The pump intake is set <br /> at approximately 29 feet below ground surface <br /> The extracted groundwater is pumped from the well into a 300-gallon <br /> storage tank, located in the remediation compound A float switch in the <br /> storage tank shuts off the pump when the tank is full to prevent overflow <br /> of the tank A five-horsepower electrical air compressor placed inside the <br /> remediation enclosure provides compressed air for the pneumatic pumps <br /> Power is supplied by a separate electrical service to the remediation <br /> compound An electrical control panel for GWE system is located inside <br /> the remediation enclosure <br /> 2 <br />