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Water Quality Monitoring Report <br />First Quarter 2024 <br />www.arcadis.com <br />Forward Landfill 1Q24 Water Quality Mon Report_05012024 17 <br />For unsaturated zone monitoring stations, one suction lysimeter (LY-W-2) contained sufficient liquid for analyses <br />of VOCs. 2-Butanone, acetone, and TBA were detected in the lysimeter sample. The sample did not contain <br />sufficient liquid for analysis of inorganic parameters. <br />3.2 Austin Road Unit <br />In general, there has been little change in the distribution of VOCs during recent quarters, which suggests that the <br />groundwater plumes are stable or decreasing. For the CAP/EMP wells, 32 wells reported one or more VOCs at <br />concentrations exceeding a PQL, with CAP well AMW-58M exhibiting the greatest total number of VOCs detected <br />and AMW-22S exhibiting the highest VOC concentrations. DMP wells AMW-6 and AMW-12 will be resampled <br />during the second quarter 2024 monitoring period to evaluate CNSDAM and CL exceedances. For the inorganic <br />monitoring parameters, CLs were exceeded in AMW-5R during first quarter 2024. In a letter dated April 23, 2024, <br />the RWQCB was notified of these exceedances (Forward 2024b). <br />Surface water samples were collected from the upstream and downstream surface water monitoring stations <br />during the first quarter 2024 monitoring period. No VOCs were detected at ASW-1 and ASW-2. For the inorganic <br />monitoring parameters, no CLs were exceeded during the first quarter 2024 monitoring period. <br />For unsaturated zone monitoring stations, three suction lysimeters (FU-04W-B, FU-06-B, and LY-POND-N) <br />contained sufficient liquid for analyses of VOCs. TBA was measured in FU-04W-B and benzene was measured in <br />FU-06-B. These samples did not contain sufficient liquid for analysis of inorganic parameters. <br />The GWTS pumped 55.9 million gallons of groundwater and removed an estimated 0.91 pound of VOCs in first <br />quarter 2024. <br />4 Certification <br />This document was prepared under the supervision of and reviewed by the undersigned California Professional <br />Geologist.* <br />______________________________________________________________________ May 1, 2024 <br />Steve Beadle, P.G., C.E.G. <br />California Professional Geologist 6129 <br />California Certified Engineering Geologist 2098 <br />* A professional geologist’s certification of conditions comprises a declaration of his or her professional judgment. It does not <br />constitute a warranty or guarantee, expressed or implied, nor does it relieve any other party of its responsibility to abide by <br />contract documents, applicable codes, standards, regulations, and ordinances.