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groundwater were measured and recorded on the well sampling data sheet. After these <br /> parameters were measured, a sample was collected for laboratory analysis to test whether volatile <br /> organic compounds (VOCs) may be present in the groundwater. The groundwater sample was <br /> collected in laboratory-supplied sample containers that were filled completely, immediately capped, <br /> labeled, and placed in an ice-filled cooler.A completed chain-of-custody form identifying the sample <br /> name, date and time collected, and the analyses to be performed, accompanied the sample to Pace <br /> Analytical Environmental Services, a state of California certified laboratory located in Bakersfield, <br /> California.The analyses performed by Pace Analytical Environmental Services included VOCs by EPA <br /> Method 8260B. <br /> The laboratory report attached to this letter shows 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 to or greater than the MDL.A laboratory result followed <br /> by the letter']" is a "trace"concentration that falls between the MDL and PQL.This value is an <br /> estimate. A reported result greater than the PQL is an accurate (quantifiable)value. <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 /> RESULTS <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 20, 2023.An estimated trace <br /> concentration of tetrachloroethene was detected in the groundwater sample. As shown in the <br /> following table,the detected concentrations were below state and federal Maximum Contaminant <br /> Levels (MCLS)for drinking water. <br /> Analyte Units Results MCL <br /> 9/20/23 <br /> Tetrachloroethene pg/L 0.13j 5 pg/L <br /> Notes: j = Indicates an estimated value <br /> pg/L= micrograms per liter <br /> CONCLUSIONS AND RECOMMENDATIONS <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 /> Forward has been working cooperatively with the CVRWQCB on groundwater investigations in the <br /> 2 <br />