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<br />STANDARD PROVISIONS AND REPORTING REQUIREMENTS, JANUARY 2012 - 19 - <br />FOR WASTE DISCHARGE REQUIREMENTS <br />FOR DISCHARGES REGULATED BY SUBTITLE D AND/OR TITLE 27 <br /> <br /> <br />cases where contaminants are detected in QA/QC samples (i.e., field, trip, or <br />lab blanks), the accompanying sample results shall be appropriately flagged, <br />but the analytical results shall not be adjusted. <br /> <br />17. Unknown chromatographic peaks shall be reported, flagged, and tracked for <br />potential comparison to subsequent unknown peaks that may be observed in <br />future sampling events. Identification of unknown chromatographic peaks that <br />recur in subsequent sampling events may be required. <br /> <br />18. The sampling interval of each monitoring well shall be appropriately screened <br />and fitted with an appropriate filter pack to enable collection of representative <br />groundwater samples [Title 27, § 20415(b)(4)(B)]. Groundwater samples shall <br />not be field-filtered prior to laboratory analysis [40 C.F.R. § 258.53(b)]. <br />Groundwater samples needing filtering (e.g., samples to be analyzed for <br />dissolved metals) shall be filtered by the laboratory prior to analysis. <br /> <br />19. Groundwater elevations shall be measured in each well immediately prior to <br />purging, each time groundwater is sampled. The owner or operator shall <br />determine the rate and direction of groundwater flow each time groundwater is <br />sampled. Groundwater elevations in wells which monitor the same waste <br />management area shall be measured within a period of time short enough to <br />avoid temporal variations in groundwater flow which could preclude accurate <br />determination of groundwater flow rate and direction [40 C.F.R. § 258.53(d)]. <br /> <br />20. Monitoring wells, piezometers, and other measurement, sampling, and <br />analytical devices must be operated and maintained so that they perform to <br />design specifications throughout the life of the monitoring program <br />[40 C.F.R. § 258.51(c)(2)]. Monitoring devices that cannot be operated and <br />maintained to perform to design specifications shall be replaced after review <br />and approval of a report (i.e., work plan) for the proposed replacement devices. <br /> <br />21. All borings are to be logged during drilling under the direct supervision of a <br />registered geologist or registered civil engineer with expertise in stratigraphic <br />well logging [Title 27, § 20415(e)(2)]. <br /> <br />22. Soils are to be described according to the Unified Soil Classification System <br />[Title 27, § 20415(e)(2)(A)]. Rock is to be described in a manner appropriate <br />for the purpose of the investigation [Title 27, § 20415(e)(2)(B)]. <br /> <br />23. The Discharger shall submit a work plan for review and approval at least <br />60 days prior to installation or abandonment of groundwater monitoring wells. <br /> <br />24. The Discharger shall provide Central Valley Water Board staff a minimum of <br />one week notification prior to commencing any field activities related to the <br />installation or abandonment of monitoring devices.