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Table 4 <br />First Semiannual 2025 Leachate Area 1 Monitoring Results <br />Foothill Sanitary Landfill <br />Sampling Designation L-1 L-2A L-2B <br />Sampling Date 01/14/25 01/14/25 01/14/25 <br />Volatile Organic Compounds (8260B) (μg/L) <br />Benzene 7 8.9 2.9 <br />Chlorobenzene 0.49 J 0.36 J <0.093 <br />Chloroethane <0.14 0.93 0.47 J <br />1,4-Dichlorobenzene 4.0 1.3 0.13 J <br />1,1-Dichloroethane <0.11 0.12 J <0.11 <br />1,2-Dichloroethane 1.1 0.71 0.78 <br />cis-1,2-Dichloroethene 1.1 0.85 0.35 J <br />trans-1,2-Dichloroethene <0.15 0.27 J <0.15 <br />1,2-Dichloropropane 0.54 2.5 0.34 J <br />Ethylbenzene 2.7 2.8 1.1 <br />Methyl t-butyl ether 0.75 0.55 0.71 <br />Naphthalene 1.8 8.0 3.4 <br />Toluene 0.23 J 1.1 0.81 <br />Trichloroethene 0.14 J <0.085 <0.085 <br />Vinyl Chloride <0.12 2.2 0.74 <br />Total Xylenes <0.36 12 9.8 <br />t-Butyl Alcohol 1000 7,200 960 <br />Ethyl t-butyl ether <0.18 0.32 J 0.51 <br />All Other VOCs ND ND ND <br />ND = Not Detected <br />NS = Not Sampled <br />NT = Not Tested <br />μg/L = micrograms per liter <br />mg/L = milligrams per liter <br />< = Not detected at or above indicated method detection limit <br />µmho/cm = micromhos per centimeter <br />NTU = nephelometric turbidity unit <br />oC = degrees Celcius <br />J = Trace concentration (estimated value) <br />Bolded values indicate VOC detections <br />2 of 2