|
15 May 2019
<br />AGE Project No. 14-3002
<br />Page 11 of 17
<br />TPH-o was detected in 5 of 36 soil samples at concentrations ranging from
<br />56.2 mg/kg in B41-10 to 5,230 mg/kg in B40-17. TPH-d was detected in B40-13
<br />and B40-17 at concentrations above the ESL, but below the hazardous waste limit.
<br />(Table 4).
<br />• Dioxin/Furans were detected in samples B9-10, B18-10, and B20-15 at Toxic
<br />Equivalency (TEQ) concentrations of 0.0149 picograms per gram (pg/g), 0.000984
<br />pg/g, and 0.0304 pg/g, respectively. Dioxin/Furans were not detected above the
<br />laboratory reporting limit in samples B16-14 and B40-17. The dioxin/furans that
<br />were detected were significantly below the ESL and hazardous waste limit in the
<br />soil samples analyzed (Table 4). An explanation for the calculation of the
<br />dioxin/furan TEQ is provided in Appendix G.
<br />
<br />No additional analytes were reported above laboratory detection limits in the soil samples
<br />analyzed. Analytical results of soil samples are summarized in Tables 2 through 4. PCB,
<br />dioxin/furan, and TPH concentrations are depicted in Figures 3 through 5 and in cross-
<br />sectional view in Figures 6 through 9. The laboratory reports (ASC Laboratory Job Nos.
<br />AE903029, AE903033, AE903037, AE903043, AE903043A, and AE904009; and MAI
<br />Work Orders 1903592, 1903652, 1903705, 193706, 190775 and 1903803), quality
<br />assurance and quality control (QA/QC) reports, and chain of custody forms are included
<br />in Appendix H. Laboratory electronic deliverable format (EDF) files will be QA/QC
<br />checked and uploaded to the State Water Board GeoTracker site.
<br />
<br />
<br />5.4. ANALYTICAL RESULTS OF WASTE SAMPLES
<br />
<br />A total of twelve (12) waste samples (waste and mixed waste/soil) collected from borings
<br />B6, B9, B16, B18, B19, B20, B35, B36 and B40 were analyzed for one or more of the
<br />constituents listed in Section 3.3; all twelve (12) waste samples were analyzed for
<br />dioxin/furans.
<br />
<br />The following analytes were detected in the waste samples:
<br />• Arsenic, barium, chromium, cobalt, copper, lead, vanadium, and zinc were
<br />detected in all the waste samples analyzed at the following maximum
<br />concentrations: arsenic at 13.5 mg/kg, barium at 61.7 mg/kg, chromium at
<br />17.6 mg/kg, cobalt at 14 mg/kg, copper at 438 mg/kg, lead at 69.5 mg/kg,
<br />vanadium at 73.9 mg/kg and zinc at 219 mg/kg. Additionally, cadmium,
<br />molybdenum and nickel, were detected in up to three waste samples at maximum
<br />concentrations of 36 mg/kg, 2.9 mg/kg, and 306 mg/kg, respectively (Table 2).
<br />• Due to elevated TTLC concentrations, STLC analysis was performed for cadmium,
<br />copper, and lead in B16-5; for nickel in B16-10; and for lead in B18-5 and B20-5.
<br />All STLC concentrations were below their respective hazardous waste limits
<br />(Table 3).
|