TABLE 4-12 Metals in Soil Near a Hazardous-Waste Incinerator Compared with Background

Element

Upper Limit of Background (mg/kg)

Number of Samples

Range of Concentrations (mg/kg)

Arsenic

10

21

3.6-6.2

Cadmium

3

21

0.3-2.3

Chromium

50

21

15-39

Lead

150

21

16-28

Mercury

0.15

5

0.03-0.10

Sources: Adapted from MOEE 1989; Ecologistics 1994.

vicinity of the facility. Fruin et al. (1994) presented the results of a multimedia monitoring study (ambient air, soils, and sediment) in the vicinity around a hazardous-waste incinerator operated by 3M (Minnesota Mining and Manufacturing) in Minnesota. The incinerator is a rotary kiln with a secondary combustion chamber, heat-recovery equipment, and five pollution-control devices. The study focused on particulate matter in ambient air and metals in soils. The study found that the incinerator contributed less than 1% of the total suspended particulates and the respirable particulates (PM10) to the total concentration in the ambient environment. A total of 180 soil samples in the potential impact zone of the incinerator were also analyzed for 21 metals. The results for the metals of greatest potential toxicological significance in nearby agricultural land, along with ranges for background presented by the authors, are included in Table 4-14. On the basis of the particulate and metals data, the authors concluded that there were negligible contributions of those combustion products from the incinerator to local concentrations.

In one of the largest studies of its kind, the Texas Natural Resource Conservation Commission (TNRCC 1995) evaluated environmental media (air, soil,

TABLE 4-13 Metals in Soil Near the Greater Vancouver Incinerator

Element

Preoperational (ppm)

Postoperational (ppm)

Arsenic

0.11

0.09-0.12

Cadmium

1.48

0.67-1.17

Nickel

2.47

1.14-1.57

Lead

1.79

1.74-3.13

Selenium

0.08

0.05

Fluorine

3.58

2.52-4.67

Sulfur

0.19

0.16-0.21

Source: Adapted from Stubbs and Knizek 1993.



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