AP2400573 (4) - Laserfiche WebLink

Home Browse Search

Appendix D:Quality Assurance and Control Assessment The 2023 First Semiannual monitoring was performed by FGL Environmental during the period 1 February 2023 through 4 April 2023; all samples were analyzed by FGL Environmental. The analytical reports provided by the laboratory will be maintained on file by the Discharger and are available upon request. Prescribed Holding Times Holding time is defined as the maximum time allowed between sample collection and sample analysis. Results may become questionable when the holding time is exceeded. Holding times vary between constituents and can range from a few hours to a few months. All samples, with the exception of the Nitrate as Nitrogen (48 hour hold time, held for 79 hours) in the sample from KMW-8, were analyzed within the prescribed holding times. Lab Blanks Laboratory blanks are analyzed using the same procedures as the environmental samples. The blanks consist of deionized and distilled (Reagent Grade Type II) water. Analysis of the blanks is used to detect potential constituent sources contributed by the laboratory. Examples can include improperly cleaned laboratory equipment, impure reagents, and persistent airborne constituents in the laboratory environment. The QA/QC review identifies lab blanks with detections of target analytes and evaluates the effect of the detections on associated sample results. All lab blank analyses were determined acceptable by the laboratory. Field Blanks Field blanks detect possible constituent sources contributed from sampling methods and equipment. Examples include, but are not limited to, improperly cleaned sampling equipment, persistent airborne constituents in the sampling environment, and constituent sources in the sample containers. Three field blanks were collected during the 2023 First Semiannual sampling event(one blank in First Quarter 2023 and two blanks in Second Quarter 2023).1 Concentrations of constituents detected in field blanks are shown in Table D-1. Sodium and Total Dissolved Solids (TDS) were detected in the field blank collected on 1 February 2023, at concentrations of 19 milligrams per liter (mg/L) and 40 mg/L, respectively. The field blanks collected on 24 March 2023 and 4 April 2023 had no detections. 1 Field blanks were collected by pumping deionized water through the sample pump and a length of tubing. Sample bottles were filled, preserved, stored, and transported using the same procedures as used for the well water samples. Field blanks for total coliform analysis were collected by filling a new disposable bailer with deionized water and then filling the sample bottle from the bailer. In order to minimize potential contamination between wells,a clean pump is used for each sample.