COMPLIANCE INFO_2023 DOMESTIC WELL SAMPLING - 9852 MARIPOSA ROAD

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2 groundwater were measured and recorded on the well sampling data sheet. After these parameters were measured, a sample was collected for laboratory analysis to test whether volatile organic compounds (VOCs) may be present in the groundwater. The groundwater sample was collected in laboratory-supplied sample containers that were filled completely, immediately capped, labeled, and placed in an ice-filled cooler. A completed chain-of-custody form identifying the sample name, date and time collected, and the analyses to be performed, accompanied the sample to Pace Analytical Environmental Services, a state of California certified laboratory located in Bakersfield, California. The analyses performed by Pace Analytical Environmental Services included VOCs by EPA Method 8260B. The laboratory report attached to this letter shows three values for each chemical compound that was analyzed: the method detection limit (MDL), the practical quantitation limit (PQL), and the result of the analysis. The MDL is the lowest concentration the laboratory can measure and the PQL is the lowest concentration that can be accurately quantified. A laboratory result of ND means the VOC was not detected at a concentration equal to or greater than the MDL. A laboratory result followed by the letter “J” is a “trace” concentration that falls between the MDL and PQL. This value is an estimate. A reported result greater than the PQL is an accurate (quantifiable) value. The laboratory reports also include the results internal laboratory quality control tests that are performed to verify the laboratory instruments are operating within the tolerances required by the analytical method and that the sample(s) being tested are not affected by laboratory contamination. Review of the quality control test results for the samples collected from your well in September 2023 shows that the laboratory equipment was operating within its specified tolerances and that the samples were not affected by laboratory contamination. RESULTS As shown on the attached laboratory report, no VOCs were detected in the groundwater sample collected on September 18, 2023. RECOMMENDATIONS Forward has been working cooperatively with the CVRWQCB on groundwater investigations in the area. In addition, the Landfill has been working with the CVRWQCB to control and reduce any identified VOCs which include a variety of man-made chemicals commonly associated with certain kinds of household waste. Forward continues to proactively monitor and sample groundwater wells at a number of residential properties near the Landfill.