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i i31 August 2000 AGE Project No 96-0232 iPage 24 of 25 i along the east side of Thornton Road from the Flag City Chevron site to the conveyance ditch located at the south side of De Broggi Road(see Figure 11) The point of discharge into the canal would be located in an area near the southeast intersection of Thornton Road and De Broggi Road Sampling ports will be installed to monitor the effluent of the pre-treated water from the Flag City Chevron site Furthermore, receiving water monitoring stations (R-1 and R-2) would be set up 50 feet upstream and 50 feet downstream from the point of discharge in the canal to monitor the effluent and the general water conditions of the canal AGE anticipates a continuous discharge of pre-treated ground water from Flag City Chevron to the canal at a flow rate of approximately 15 to 20 gallons per minute Based on modeling calculations of the Flag City Chevron subsurface impacted ground water plume, AGE estimates that discharge into the canal would be necessary for approximately two years I6 2 4 Ground Water Extraction Monitoring Activities The pump and treat system will be monitored weekly to ensure optimal removal of dissolved petroleum hydrocarbons The ground water influent and effluent flow readings will be recorded before the GAC phase and after the Sun Solve filter-media phase Grab water samples will be ' collected on a bi-weekly basis from the influent and effluent end of the pump and treat system The samples will be collected in and transported to a DTSC-certified laboratory in a chilled container ' under ice under chain-of-custody procedure During the "start-up" period for the ground water extraction system, operational parameters and ' ground water samples will be collected on a daily basis The anticipated start-up period will be approximately two weeks ' Samples will be obtained and analyzed from the holding tank prior to initial discharge to evaluate the effectiveness of the treatment system If the analytical results do not indicate the detection of hydrocarbon compounds,AGE will request the RWQCB to allow continuous discharge directly from, ' the treatment system into the conveyance ditch ' 63 PROGRESS AND CONFIRMATION SAMPLING After approximately twenty-four months of operation or when a significant decrease of efficiency ' is noted,soil and ground water samples will be collected from the target remediation area Analytical results of the soil and ground water samples will serve to assess remaining petroleum hydrocarbon levels and determine if continuing remedial operation is necessary ' Samples will be collected utilizing a direct push technology AGE proposes to advance soil probe ' borings in the "core"petroleum hydrocarbon impacted area at the site to depths of approximately Advanced GeoEnvironmental,Inc