ARCHIVED REPORTS_XR0004276 - Laserfiche WebLink

Home Browse Search

' required) and analyzed for TKN, ammonia, nitrate, and nitrate EPA methods 3514, 350 3, 353 2, and 353 2) to monitor the nitrogen concentrations reinjected into the aquifer The results of the bench-scale test will be presented to the SJCPHS and RWQCB for confirmation as to whether a nitrogen removal system is required The specifications for the nitrogen removal system will be submitted to the SJCPHS and the RWQCB for approval prior to implementation if it is determined that the system is required 2.4 Field Activities and Remediation Following installation of the remediation system, start-up activities and a pilot test will be performed by Waste Science and Aprotek During the initial start-up, approximately 650 gallons of groundwater will be extracted from the aquifer and collected in the mixing tank This reservoir volume will be maintained in order to provide sufficient retention time for the multi-enzyme complex to adequately degrade ' the petroleum hydrocarbons The actual rate of extraction and volume of water removed will be monitored and adjusted as necessary to ensure a sufficient capture zone is created Once start-up activities are completed, the system will be operated M12 hours per day until cleanup levels are reached Nighttime operation of the system will be via an automatic feed system An automatic shutoff and automatic dial ' system will be installed to cease operations and notify the contact person if problems are encountered when the site is not attended During the course of remediation, ' water levels in monitoring wells not included in the bioremediation system will be measured daily to ensure that hydraulic control of the contaminant plume is being maintained ' The enzyme and natural bactena-laden water will be circulated from the tank through the PVC pipe and re-injected through the injection wells at the same rate ' that it is extracted This will result in circulation of the enzymatic complex through the zone of contamination An added advantage of this setup is that the enzymatic complex will become impregnated in the soil matrix through drawdown of the water table Consequently, the complex will react to any hydrocarbons present in the saturated soils Should any bacterial clogging occur during the operation, hydrogen ' peroxide will be added to the mixing tank or injection line. At the end of the remediation period, the remaining solution in the mixing tank will be re-injected through the extraction well In this manner, any remaining contaminants in the 9488 East Bay Municipal Utility District 40429601 rap 12 Remedial Action Plan