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2 <br /> <br /> <br /> <br /> <br />compounds (VOCs) may be present in the groundwater. The groundwater sample was collected in <br />laboratory-supplied sample containers, filled completely, immediately capped, labeled, and placed in <br />an ice-filled cooler. A completed chain-of-custody form identifying the sample name, date and time <br />collected, and the analyses to be performed, accompanied the sample to Pace Analytical <br />Environmental Services, a state of California certified laboratory located in Bakersfield, California. <br />The analyses performed by Pace Analytical Environmental Services included VOCs by EPA Method <br />8260B. <br /> <br />The laboratory report attached to this letter show three values for each chemical compound that <br />was analyzed: the method detection limit (MDL), the practical quantitation limit (PQL), and the result <br />of the analysis. The MDL is the lowest concentration the laboratory can measure and the PQL is the <br />lowest concentration that can be accurately quantified. A laboratory result of ND means the VOC <br />was not detected at a concentration equal or greater than the MDL. A laboratory result followed by <br />the letter “J” is a “trace” concentration that falls between the MDL and PQL. This value is an estimate. <br />A reported result greater than the PQL is an accurate (quantifiable) value. <br /> <br />The laboratory reports also include the results of internal laboratory quality control tests that are <br />performed to verify the laboratory instruments are operating within the tolerances required by the <br />analytical method and that the sample(s) being tested are not affected by laboratory contamination. <br />Review of the quality control test results for the samples collected from your well in September <br />2023, shows that the laboratory equipment was operating within its specified tolerances and that <br />the samples were not affected by laboratory contamination. <br /> <br />RESULTS <br /> <br />As shown on the attached laboratory report and summarized in the following table, one VOC was <br />detected in the groundwater sample collected on September 12, 2023. Tetrachloroethene was <br />measured at a quantifiable concentration of 1.6 micrograms per liter (µg/L) in the groundwater <br />sample. As shown in the following table, the detected concentration was below state and federal <br />Maximum Contaminant Levels (MCLs) for drinking water. <br /> <br />Analyte Units Results <br />9/12/23 <br />MCL <br />Tetrachloroethene µg/L 1.6 5 µg/L <br />Notes: µg/L = micrograms per liter <br /> <br /> <br />CONCLUSIONS AND RECOMMENDATIONS <br /> <br />The analytical results indicate that no MCLs for drinking water were exceeded in the groundwater <br />sample collected. MCLs are standards set by the United States Environmental Protection Agency <br />(EPA) and the State of California for drinking water quality. An MCL is the legal threshold limit on the <br />amount of a substance that is allowed in public water systems under the Safe Drinking Water Act. <br /> <br />Forward has been working cooperatively with the CVRWQCB on groundwater investigations in the <br />area. In addition, the Landfill has been working with the CVRWQCB to control and reduce any <br />identified VOCs which include a variety of man-made chemicals commonly associated with certain