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15 January 2001 <br /> AGE-NC Project No 96-0232 <br />' Page 7 of 20 <br />' A 2-horsepower, 230-volt, single-phase centrifugal process pump was installed directly behind the <br /> holding tank The process pump is designed to process ground water through the treatment system <br /> at a maximum flow rate of 25 gallons per minute (GPM) From the process pump, 2-inch diameter <br />' PVC piping (schedule 40) was routed to a 5-gallon suspended solids filter chamber equipped with <br /> 25-micron replaceable blown-fabric sediment filter bags <br /> From the filter chamber, schedule 40 PVC piping was routed to two 2,500 pound vessels containing <br /> I granular activated carbon (GAC) and then through two 2,500 pound vessels contairung Sunsolve <br /> media (a liquid phase filtration media) The first two GAC media vessels are designed to adsorb <br />' TPH-g, TPH-d and BTEX compounds, the final two Sunsolve media vessels are designed to adsorb <br /> MTBE and TBA Brass sampling ports were installed at the influent,between the media vessels and <br /> at the effluent to allow detection of potential media break through and to obtain final discharge <br /> Isamples The ground water pump and treat system layout is depicted in Figures 11 and 12 <br />' A battery operated, F-2000 (model RT) Blue-White Industries flow meter was installed on the <br /> effluent line to continuously measure and display the effluent flow rate and to continuously measure <br /> and display the total flow The flow meter is designed to operate between 6 and 60 gallons per <br /> lie minute <br /> An electrical control panel was installed adjacent the process pump Electrical wiring from the <br />' ground water extraction pumps, process pump and holding tank float controls were connected from <br /> the through Class I electrical connectors/unction boxes and electrical conduit to the electrical control <br /> panel Electrical PumpTec controller boxes were installed in the electrical control panel for <br />' individual control measures of extraction well pumps and the process pump Pump controls are <br /> supplied by an amperage sensing/time control switch This switch will detect any decrease in <br /> amperage when water level drops below the inpellor intake from any of the Grundfos pumps <br /> 54 OFF-SITE DISCHARGE PIPE-LINE INSTALLATION <br />' Between 13 and 17 November 2000, an off-site discharge pipe-line was constructed from the <br /> southwest section of the Flag City Chevron site to a conveyance ditch (Coldani ditch) located <br />' approximately 450 feet south of the site San Joaquin County encroachment permitting, planning and <br /> construction supervision of the discharge pipe-line was performed by Dillon and Murphy Consulting <br /> and Civil Engineers, a California-certified civil engineering firm from Lodi CA Construction of the <br />' off-site discharge pipe-line was conducted by Crutchfield Construction Company (CCC), a <br /> California-certified contractor from Stockton CA Excavation of the trench-line was performed in <br />' the southwest section of the Flag City Chevron site and in the San Joaquin County public right-of- <br /> way, a copy of the San Joaquin County encroachment permit is included in Appendix E A backhoe <br /> equipped with a 24-inch bucket was utilized to excavate a trench-line approximately 36 inches deep <br />' Advanced GeoEnvironmental,Inc <br />