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25 January 2005 <br /> AGE-NC Project No 99-0559 <br /> Page 6 of 10 <br /> 3 1 GROUND WATER REMEDIATION SYSTEM <br /> The ground water treatment system is designed to operate at a maximum flow rate of up to 5 gallons <br /> per minute (GPM), therefore, each of the four recovery wells was adjusted to extract ground water <br /> at a flow rate of approximately 2 GPM by extracting on an intermittent cycle The operation of the <br /> ground water pumps allows for a hiatus when water falls below the pump inlet to allow the well to <br /> recharge, after which the pump reactivates <br /> The ground water treatment system operates on a batch basis,approximately 250 gallons of extracted <br /> groundwater is treated and discharged,with a daily total of up to 4,000 gallons Total flow(totalizer) <br /> was recorded utilizing the Blue-White Industries F-2000 inline flow meter The treated water <br /> (effluent)is discharged to the City of Stockton municipal waste water treatment facility Field notes <br /> from ground water pump and treat operation and maintenance activities are provided in Appendix B <br /> 3 2 MONTHLY MONITORING PROCEDURES <br /> In order to quantify the mass of contamination removed from each extraction well and to comply <br /> with the requirements of the City of Stockton discharge permit, monthly monitoring and sampling <br /> of influent (except October) and effluent ground water was performed on 20 July, 17 August, 16 <br /> September, 22 November and 14 December 2004 <br /> Influent samples were collected in laboratory-supplied 40-m1 EPA-approved VOA vials containing <br /> 0 5 ml 18% hydrochloric acid as a preservative, care was taken to ensure that visible air bubbles <br /> were not present in the vials after filling and capping The effluent sample was collected in VOA <br /> vials and a 1-liter amber bottle without preservative All samples were labeled with the sample <br /> location, date, time, and sampler's Initials The samples were subsequently logged on a chain-of- <br /> custody form, placed in a chilled container and transported to CTEL for analysis <br /> i <br /> The influent samples were analyzed for <br /> • TPH-g by EPA Method 8015 Modified, and <br /> • Volatile aromatic compounds(VOCs) including BTEX and MTBE by EPA Methods 8260, <br /> The effluent samples were analyzed for <br /> • TPH-g by EPA Method 8015 Modified/TPH-d (diesel) by EPA method 8015 Modified, <br /> • BTEX with MTBE by EPA Methods 8260, and <br /> Advanced GeoEnvironmental,Inc <br />