Laserfiche WebLink
1 <br />' 15 January 2002 <br /> • AGE-NC Project No 96-0232 <br />' Page 2 of 16 <br />' continuously operated at the site, ground water pump-and-treat operation and maintenance <br /> procedures for the site were outlined in Final Remediation Plan, dated 31 August 2000, prepared <br /> by AGE and approved by the RWQCB by letter dated 05 October 2000 <br /> 2 1 GROUND WATER PUMP AND TREAT OPERATION <br />' The ground water pump and treat system was designed to operate at a maximum flow rate of 25 <br /> gallons per minute (GPM) Selected on-site extraction wells were adjusted at each well-head to <br />' extract ground water from selected wells at a flow rate of approximately 5 to 6 GPM, the extracted <br /> ground water was routed through a ground water treatment system consisting of granular activated <br /> carbon (GAC) and Sunsolve® Following treatment, water was discharged to the Coldam ditch <br />' (located approximately 450 feet south of the site) at a flow rate of approximately 23 GPM Field <br /> notes of ground water pump and treat operation and maintenance activities are in Appendix A <br />' Based on effluent flow meter readings (Appendix A), approximately 2,043,809 gallons of treated <br /> water were extracted and discharged to the Coldani ditch during the fourth quarter 2001 under <br /> RWQCB General Order 5-00-119 for discharge to surface waters of ground water from cleanup of <br /> petroleum fuel pollution Since initiation of the ground water pump and treat remediation system on <br /> 20 November 2000, a total volume of approximately 9,303,630 gallons of MTBE-impacted water <br /> has been treated and discharged to the Coldam ditch An RWQCB waste water discharge (NPDES <br /> permit no CAG915001)permit for discharge to the Coldam ditch was issued to Flag City Chevron <br /> by the RWQCB by letter dated 06 November 2000 <br /> 2 2 GROUND WATER PUMP AND TREAT SAMPLING PROCEDURES <br /> Samples of ground water pump-and-treat influent and effluent water were collected from valved <br /> sampling ports located upstream (influent) and downstream (effluent) of the treatment unit <br /> Receiving water sampling stations are located in the Coldam ditch approximately 50 feet upstream <br /> (R-1) and 80 feet downstream(R-2) of the point of discharge, R-1 and R-2 locations were approved <br /> by the RWQCB during a site inspection on 22 November 2000 <br /> Grab water samples were collected from influent, effluent and receiving water locations utilizing <br /> 1-liter amber bottles and 1-gallon plastic jugs without a sample preservative and 40-m1 EPA- <br /> approved VOA vials contai ung 0 5 ml 18% hydrochloric acid as a sample preservative Care was <br /> taken to ensure that visible air bubbles were not present in the vials after filling and capping Ground <br /> water sample containers were labeled with a sample designation, date, time, and sampler's initials <br /> Advanced CeoEnvnronmental,Inc <br /> I <br />