Laserfiche WebLink
1 <br /> ' 10 February 2005 <br /> . AGE-NC Project No 98-0521 <br /> Page 3 of 6 <br /> 10 gallons per minute(GPM),therefore, each of the recovery wells was adjusted to extract ground <br /> ' water at a flow rate of approximately 2 to 2 5 GPM by extracting on an intermittent cycle from wells <br /> MW-2 and MW-4 The operation of the ground water pumps allows for a hiatus when water falls <br /> ' below the pump inlet to allow the well to recharge, after which the pump reactivates <br /> The groundwater 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 maintenance and operation activities are provided in Appendix C <br /> ' 2 2 2 Monthly Monitoring Procedures r <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 and effluent ground water was performed on 06 August and 15 September 2004 <br /> 4 <br /> . The samples were collected into laboratory-supplied 40-m1 EPA-approved volatile organic analysis <br /> (VOA) vials containing 0 5 ml 18% hydrochloric acid as a preservative and 1-liter amber bottles <br /> without preservative Care was taken to ensure that visible air bubbles were not present in the VOA <br /> vials after filling and capping All samples were labeled with the sample designation,date,time,and <br /> sampler's initials The samples were subsequently logged on a chain of custody form, placed in a <br /> chilled container and transported to CTEL for analysis The samples were analyzed for <br /> • TPH-g and diesel (TPH-d) by EPA Method 8015M _ <br /> ' BTEX and the fuel additives DIPE, ETBE, MTBE, TAME and TBA by Method SW846 <br /> 8260B, and <br /> ' pH in accordance with EPA Method 150 1 <br /> ' 3.0. FINDINGS <br /> The ground water flow direction and gradient were inferred from the field data Dissolved petroleum <br /> hydrocarbon-impact to ground water was quantified by laboratory analysis of the samples collected <br /> Pump-and-treat calculations were based on laboratory analysis of ground water treatment samples <br /> ' Advanced GeoEnvironment$1,Inc <br />