Technical Memorandum for 2011: Soil Sampling Former Robson-Lang Tannery Site, Oshawa, Ontario

Prepared by:

Terrestrial Assessment Unit Air Monitoring
Transboundary Air Sciences Section
Environmental Monitoring and Reporting Branch

Report No. S3047-2011(a)
September 2011

Introduction

The offices of the Central Lake Ontario Conservation Authority (CLOCA), located at 100 Whiting Avenue, Oshawa, Ontario, reside on lands that were formerly occupied by the Robson-Lang Leathers Limited (Robson-Lang) tannery. In the early 1860s, A.S. Whiting established a farm implement manufacturing facility on the property which was in operation until 1886 (Weymark, 2009). In 1899, a tannery, which was to become the Robson Leather Company Ltd., moved into the vacated buildings of the former farm implement manufacturing facility (Weymark, 2009). By 1905, the tannery had become one of the foremost tanneries in Canada. In 1963, the Robson Leather Company combined with the James Lang Leather Company Limited and the name was changed to Robson-Lang Leathers Limited. In 1977, the Oshawa tannery was closed and in 1980 the buildings were destroyed by fire. Soon after, most of the buildings were demolished however the main office building and former stables were converted into offices for CLOCA (Map 1).

In April 2010, the Ontario Ministry of the Environment’s (MOE or Ministry) York-Durham District Office requested the assistance of the Ministry’s Terrestrial Assessment Unit (TAU) to help delineate and document the extent of contamination associated with past industrial activities on the former Robson-Lang property, with particular emphasis on the walking trail and the forested northeast area of the property.

Methods

On November 10^th and 24^th, 2010, TAU staff sampled soil at 20 sites on the former Robson-Lang property (Map 1). The Universal Transverse Mercator (UTM) coordinates for the sampling sites are given in Table A1. At each site, duplicate composite soil samples were collected at four depth ranges (0-5 cm, 5-10 cm, 10-15 cm and 15-30 cm) using a stainless steel soil corer (2.5 cm internal diameter). To collect the soil, the soil corer was inserted vertically into the soil to a depth greater than 30 cm or to refusal and extracted. The resulting soil plug was divided into the four depth ranges and the soil core from each depth range was placed in a new polyethylene bag. This process was repeated until a composite sample comprised of nine cores was collected for each depth range. The composite samples were collected over a 10 m × 10 m area using in a 3 × 3 grid sampling pattern. In total, eight bags of soil (nine plugs of soil from each of four depths × two replicates) were collected at each sampling site. The soil corer was washed with a solution of laboratory detergent and rinsed with distilled/de-ionized water prior to sampling at each site

Following collection, the soil samples were taken to the TAU sample processing laboratory at 125 Resources Road in Toronto, where they were processed (air-dried, homogenized, and sieved, first through a 2 mm sieve and then ground and passed through a 355µm sieve). The processed samples were submitted to the Ministry’s Laboratory Services Branch where they were analyzed for metals (laboratory-accredited method E3470), mercury (laboratory-accredited method E3059) and antimony, arsenic and selenium (laboratory-accredited method E3245).

Concentration contour maps for the chromium (all depths) and lead (0-5 cm only) were produced using the Kriging gridding method via the grid-based graphics software program Surfer® 7 (Golden Software, Inc.).

Map 1: Aerial image of former site of Robson-Lang tannery property with sampling site numbers, CLOCA head office, trail and Oshawa Creek labels superimposed on the image Source: Google Earth.

Results and Discussion

Historic contamination of the former Robson-Lang tannery site has been documented by various investigations and sampling programs in the past (PGL, 2007). The current survey was not designed to determine whether contamination existed at this site, but rather to delineate and document the extent of contamination in the vicinity of the walking trail and in the forested northeast area of the property.

Soil samples were collected over an area of approximately 200 m × 450 m (Map 1). Composite soil samples were collected over a 10 × 10 m grid at each of the 20 sampling sites to provide an estimate of the average soil contaminant concentrations at each sampling site. Sampling sites were established along more or less parallel lines; one line transecting the south-southwestern flood plain of the Oshawa Creek, two lines running along on either side of the walking tail and two lines transecting the forested area northeast of Oshawa Creek as shown in Map 1. The former Robson-Lang property is part of the Oshawa Valleylands and the Oshawa Creek flows through the property in a southeasterly direction (Map 1). Old building foundations were evident throughout the area sampled and slag-like material was evident on the creek bank close to Site 9 (Photo 1).

Photo 1: Slag-like material on bank of the Oshawa Creek bank east of Site 9.

Photo 2: View looking south to Site 14 from the walking trail.

The ash, willow and other hardwood trees in the vicinity of the walking trail and along the Creek tended to be small (Photo 2) with larger trees found generally in the areas of Sites 1 to 6. No visible symptoms of chromium phytotoxicity, which can include stunted growth, purple-green leaves, curled leaves, purpling of leaf basal tissues, and brownish-red leaves containing small necrotic areas (Pratt, 1966) were observed on the vegetation during the collection of the soil samples. This was not unexpected, since chromium phytotoxicity is considered nonexistent under field conditions, except possibly in soils derived from ultrabasic or serpentine rocks (Adriano, 2001). Chromium [both Chromium (III) and Chromium (VI)], is relatively unavailable for plant uptake and tends to accumulate in the roots and not be translocated to plant shoots (Adriano, 2001). Although the trees in the survey area tended to be small and scrubby, this was not attributed to metal toxicity, but rather to the relatively short period of time since the tannery was demolished and the less than ideal substrate (rubble, concrete foundations, old road beds) in which the trees are growing.

At most sampling sites, collecting soil cores to a depth of 30 cm was a challenge due to the shallow soils and buried debris associated with the former industrial facilities that once occupied this site. Consequently, it was not possible to collect soil samples at depth from Sites 10 and 16 and no data is reported for the 15-30 cm depth interval for these sites (Table D).

In general, there were no obvious signs of soil contamination, such as staining, discolouration, chemical/petroleum odours, apart from debris, such as bricks, concrete and glass, from the demolition of the tannery. However, in one soil core, collected at Site 11, there was obvious blue-green staining (Photo 3).

Photo 3: Soil core collected at Site 11 showing blue-green staining.

Chrome tanneries are known to be sources of chromium, lead, copper and zinc contamination, with chromium (III) being by far the most abundant and potentially hazardous constituent of tannery waste (Conrad et. al., 1976). In the current soil survey, chromium concentrations exceeded the MOE Table 9 background-based and Table 3 effects-based standards at all sites sampled except Sites 1 and 2, with concentrations ranging up to 56,000 ug/g (Site 19, Table D). Antimony, arsenic, barium, cadmium, copper, lead, mercury, molybdenum, nickel, thallium and zinc soil concentrations also exceeded these standards (see Tables A to D) at these sites although not to the same degree as chromium. Exceedences for numerous metals were detected at Sites 4, 6, 9, 11, and 19 (see Tables A to D). The high concentrations of metals reported at sites where chromium concentrations were also highly elevated suggesting that the former Robson-Lang tannery was a contributing source of metal contamination.

The reported chromium concentrations are considered "total" concentrations, however, chromium is difficult to extract from soil with the aqua regia digest method used by the Ministry’s analytical laboratory. Therefore, it is possible that the actual chromium concentrations found in the soil are potentially higher than those reported. No metals speciation work was conducted as part of this survey however it is likely that most of the chromium is chromium (III), since only chromium (III) is used in the production of leather (Conrad et. al., 1976).

In this report, the element concentrations are compared to the Ministry’s Ontario Regulation 153/04 Table 9 and Table 3 soil quality standards. Table 9 standards (Generic Site Condition Standards for Use within 30 m of a Water Body in a Non-Potable Ground Water Condition) were applied as the Oshawa Creek runs along the western and southern areas of this property. The Non-Potable Ground Water Condition (Table 3) standards were also applied since this area is serviced by a Municipal water supply. The Table 9 standards are based on the upper limits of typical Ontario-wide background concentrations of element/compounds in soils that are not contaminated by point sources of pollution. The Ministry’s Table 3 standards (Full Depth Generic Site Condition Standards in a Non-Potable Ground Water Condition) are effects-based standards that are derived from effects-based data reported in the scientific literature. The "Parkland" land-use category was applied in comparing the results to these standards since a walking trail, which is used by the public, runs through the southern part of the property.

Concentration contour maps (Figures 1 to 4) were produced for the chromium data based on the four sampling depths (0-5 cm, 5-10 cm, 10-15 cm and 15-30 cm). Overall, chromium concentrations exceeded both the MOE Table 9 and Table 3 soil standards over most of the area sampled. As can be seen in Figure 1, surface soil chromium concentrations tended to be highest in the vicinity of Sites 4 and 6 in the eastern part of the property and lowest in the vicinity of the walking trail. The contamination in the vicinity of Sites 4 to 6 did not extend to Site 1 and 2 which suggests that the contamination may not extend to Wentworth Avenue. Also, the contamination in this area tended to decrease with increasing sampling depth. However, at Sites 9 and 19, the extent of contamination tended to increase with sampling depth (Figures 1 to 4). These concentration contour maps provide statistical approximations of the spatial distribution of chromium concentrations. It should be noted that these concentration contour maps cannot be used to determine actual concentrations of a contaminant at a location where a sample was not taken.

Figure 1: Chromium concentration (ug/g) contours based on the analytical results from soil samples collected at a depth of 0-5 cm. Contour lines are superimposed on an aerial image of the former Robson-Lang tannery site. Source: Google Earth

Figure 2: Chromium concentration (ug/g) contours based on the analytical results from soil samples collected at a depth of 5-10 cm. Contour lines are superimposed on an aerial image of the former Robson-Lang tannery site. Source: Google Earth

Figure 3: Chromium concentration (ug/g) contours based on the analytical results from soil samples collected at a depth of 10-15 cm. Contour lines are superimposed on an aerial image of the former Robson-Lang tannery site. Source: Google Earth

Figure 4: Chromium concentration (ug/g) contours based on the analytical results from soil samples collected at a depth of 15-30 cm. Contour lines are superimposed on an aerial image of the former Robson-Lang tannery site. Source: Google Earth

In addition, a concentration contour map was constructed from surface lead (0-5 cm) (Figure 5). Surface soil lead concentrations were highest in the wooded areas around Sites 3, 4 and 6 and at background concentrations along some sections of the walking trail (between Site 12 and 14).

Figure 5: Lead concentration (ug/g) contours based on the analytical results from soil samples collected at a depth of 0-5 cm. Contour lines are superimposed on an aerial image of the former Robson-Lang tannery site. Source: Google Earth

Conclusion

High levels of chromium, barium, lead and zinc contamination, well above the MOE Table 3 effects-based standards, were detected at most sites sampled on the former Robson-Lang tannery lands. In addition, concentrations of antimony, arsenic, cadmium, copper, mercury, molybdenum, nickel and silver consistently exceeded the MOE Table 9 background-based standards at most sites.

Contour maps of surface soil concentrations (0-5 cm) of chromium and lead showed that contamination was greatest in the wooded northeastern area of the property but did not extend to Wentworth Avenue. In this area, contaminant concentrations tended to decrease with increasing soil depth. However, at Sites 9 and 19, chromium concentrations were high in surface soil but tended to increase with sampling depth. The highest chromium concentration detected (56,000 ug/g chromium) was reported at Site 19 at a depth of 15-30 cm. Overall, the soil samples collected from the former Robson-Lang property were found to be highly contaminated with metals which are primarily attributable to tannery wastes from the former Robson-Lang tannery.

Table A: Element concentrations (ug/g) in surface soil (0-5 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Aluminum	Antimony	Arsenic	Barium	Beryllium	Boron
1	A	4300	0.5 <T	4.2	120	0.33	11
1	B	4400	0.4 <T	3.1	120	0.33	9.5
2	A	13000	0.2 ≤W	1.9	120	0.58	11
2	B	11000	0.2 ≤W	2.2	110	0.5	8.8
3	A	9500	0.5 <T	3.3	140	0.65	15
3	B	9200	0.5 <T	2.6	110	0.5	16
4	A	4400	7.2*	17	160	0.43	15
4	B	5400	8.3**	15	170	0.53	13
5	A	7200	1.6*	2.3	93	0.38	12
5	B	8600	1.1	2.1	100	0.45	15
6	A	6600	8.3**	32**	1000**	0.83	19
6	B	6800	6.8**	21**	650**	0.98	19
7	A	8100	0.3 <T	4.5	82	0.43	10
7	B	9300	0.4 <T	4.8	90	0.5	12
8	A	6900	0.2 ≤W	1.8	49	0.38	9.5
8	B	7800	0.2 ≤W	2	57	0.38	9.8
9	A	7200	1.2	2.7	680**	0.33	16
9	B	6800	1.8*	2.4	710**	0.33	14
10	A	9800	0.5 <T	2	110	0.43	10
10	B	10000	0.5 <T	1.9	110	0.48	12
11	A	9500	4.6*	4.4	1900**	0.35	18
11	B	10000	4.4*	4	1900**	0.33	18
12	A	9800	0.5 <T	2	87	0.33	9.8
12	B	11000	0.5 <T	2.8	91	0.35	10
13	A	5700	1	7.9	120	0.28	22
13	B	4700	0.7 <T	6.1	140	0.2	14
14	A	9500	0.4 <T	2.4	71	0.3	9
14	B	9200	0.3 <T	2.1	69	0.25	8
15	A	5800	0.7 <T	3.1	180	0.23	13
15	B	5300	0.6 <T	2.5	170	0.23	12
16	A	9700	0.3 <T	2.2	62	0.4	7.3
16	B	10000	0.3 <T	2.1	63	0.43	7.5
17	A	6100	1.2	4.9	320	0.43	18
17	B	6900	1.2	6.2	390	0.48	20
18	A	9400	1	6.9	350	0.58	15
18	B	11000	1.2	8.3	460**	0.68	19
19	A	10000	1.4	6.7	320	0.63	13
19	B	9200	1.3	8.1	210	0.58	12
20	A	10000	0.7 <T	4.8	230*	0.58	19
20	B	11000	0.9 <T	4.4	200	0.55	18
Maximum		13000	8.3	32	1900	0.98	22
MOE Table 9		NV	1.3	18	220	2.5	36
MOE Table 3		NV	7.5	18	390	4	120

Table A continued: Element concentrations (ug/g) in surface soil (0-5 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Cadmium	Calcium	Chromium	Cobalt	Copper	Iron
1	A	0.4	240000	43	2.4	30	6900
1	B	0.4	290000	44	2.4	17	6000
2	A	0.1 <MDL	120000	46	5.6	22	15000
2	B	0.2	99000	48	4.7	20	13000
3	A	0.4	74000	1400**	5.6	35	16000
3	B	0.4	79000	950**	5	31	15000
4	A	0.8	82000	35000**	7.8	48	65000
4	B	0.9	84000	29000**	7.8	44	60000
5	A	0.3	95000	1400**	3.9	19	15000
5	B	0.4	100000	1700**	4.9	22	14000
6	A	4.9**	89000	31000**	7.8	76	50000
6	B	4.1**	88000	27000**	8.5	65	45000
7	A	0.2	110000	440**	4.8	16	16000
7	B	0.2	110000	470**	5.4	17	17000
8	A	0.1 <MDL	110000	150*	4.1	11	13000
8	B	0.1 <MDL	110000	180**	4.2	13	14000
9	A	0.6	77000	1200**	3.5	56	17000
9	B	0.8	81000	1600**	3.2	55	15000
10	A	0.3	87000	260**	4.8	18	16000
10	B	0.4	96000	300**	5.2	19	17000
11	A	1.9**	81000	2500**	4.9	130*	23000
11	B	2.6**	80000	2700**	4.7	150**	22000
12	A	0.2	77000	160*	4.7	18	15000
12	B	0.3	72000	200**	5.2	19	15000
13	A	0.9	43000	1600**	4.5	80	49000
13	B	0.8	55000	2000**	3.5	48	33000
14	A	0.3	38000	510**	3.8	15	16000
14	B	0.3	37000	530**	3.6	13	15000
15	A	0.8	79000	2000**	3.2	25	12000
15	B	0.8	84000	1800**	3	22	11000
16	A	0.3	49000	170**	4.2	15	16000
16	B	0.2	50000	170**	4.5	16	17000
17	A	3.3**	64000	3600**	3.8	40	14000
17	B	3.4**	56000	3700**	4.3	47	15000
18	A	2**	76000	3500**	4.8	38	18000
18	B	2.6**	81000	4500**	5.5	46	19000
19	A	1	45000	2100**	5.7	37	20000
19	B	1	50000	2300**	5.2	32	19000
20	A	1.8**	66000	2200**	6.3	34	19000
20	B	1.5**	65000	2200**	6	34	19000
Maximum		4.9	290000	35000	8.5	150	65000
MOE Table 9		1.2	NV	70	22	92	NV
MOE Table 3		1.2	NV	160	22	140	NV

Table A continued: Element concentrations (ug/g) in surface soil (0-5 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Lead	Magnesium	Manganese	Mercury	Molybdenum	Nickel
1	A	42	2200	180	0.03 <T	0.5 <MDL	14
1	B	39	2200	160	0.06	0.5	12
2	A	48	5100	280	0.04 <T	0.5 <MDL	17
2	B	56	4300	260	0.04 <T	0.5 <MDL	16
3	A	300**	4400	500	0.06	1	19
3	B	1300**	4500	500	0.08	0.5	17
4	A	790**	4900	440	1.1**	18**	180**
4	B	540**	5100	460	1.3**	16**	140**
5	A	130**	5100	290	0.05	1	18
5	B	90	5400	350	0.06	1	17
6	A	750**	5100	440	1.1**	16**	150**
6	B	620**	5400	450	1.2**	14**	150**
7	A	27	5800	310	0.02 <T	0.5 <MDL	14
7	B	33	5900	320	0.04 <T	0.5 <MDL	16
8	A	23	6700	290	0.04 <T	0.5 <MDL	29
8	B	23	7100	320	0.04 <T	0.5 <MDL	29
9	A	120**	4000	290	0.07	2.5*	25
9	B	120**	4000	260	0.08	2	22
10	A	52	5900	320	0.04 <T	0.5 <MDL	13
10	B	62	6200	350	0.04 <T	0.5 <MDL	15
11	A	390**	4200	290	0.26	6.5*	28
11	B	420**	4300	300	0.32**	6.5*	30
12	A	53	6000	390	0.03 <T	0.5 <MDL	19
12	B	56	5600	380	0.03 <T	0.5 <MDL	19
13	A	50	3100	970	0.04 <T	8.5**	36
13	B	43	3200	590	0.05	4.5*	22
14	A	37	4100	290	0.06	0.5 <MDL	13
14	B	36	4000	280	0.06	0.5 <MDL	13
15	A	80	4000	250	0.07	0.5 <MDL	13
15	B	75	4000	240	0.08	0.5 <MDL	12
16	A	35	3900	340	0.04 <T	0.5 <MDL	12
16	B	34	4100	340	0.05	0.5 <MDL	13
17	A	130**	3600	240	0.18	1	21
17	B	140**	3500	250	0.21	1	24
18	A	130**	4700	260	0.1	1.5	21
18	B	160**	5100	280	0.12	1	25
19	A	210**	4400	290	0.18	1.5	20
19	B	150**	4300	260	0.22	1	18
20	A	120	5600	330	0.1	1	32
20	B	110	5300	310	0.1	0.5	30
Maximum		1300	7100	970	1.3	18	180
MOE Table 9		120	NV	NV	0.27	2	82
MOE Table 3		120	NV	NV	0.27	6.9	100

Table A continued: Element concentrations (ug/g) in surface soil (0-5 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Phosphorus	Potassium	Selenium	Silver	Sodium	Strontium
1	A	850	750	0.7 <T	0.2 <MDL	100	100
1	B	950	700	0.6 <T	0.2 <MDL	100	110
2	A	850	2300	1	0.2 <MDL	750	110
2	B	900	1800	1	0.2 <MDL	800	92
3	A	1300	1900	0.3 <T	0.2 <MDL	250	87
3	B	1100	1800	0.3 <T	0.2 <MDL	250	87
4	A	2000	1100	0.6 <T	1.6*	100	120
4	B	1300	1300	0.5 <T	1.4*	150	120
5	A	1300	1500	0.2 ≤W	0.2 <MDL	200	110
5	B	1200	1800	0.2 ≤W	0.2 <MDL	250	110
6	A	1100	1400	0.9 <T	1.6*	200	160
6	B	100	1500	0.9 <T	0.4	150	150
7	A	1100	2300	0.2 ≤W	0.2 <MDL	250	140
7	B	1100	2500	0.2 ≥W	0.2 <MDL	250	140
8	A	900	1800	0.2 ≤W	0.2 <MDL	250	150
8	B	800	2000	0.2 ≤W	0.2 <MDL	250	150
9	A	1300	1300	0.2 ≤W	0.4	300	110
9	B	1100	1200	0.2 ≤W	0.4	300	120
10	A	950	2500	0.2 ≤W	0.2 <MDL	250	120
10	B	950	2800	0.2 ≤W	0.2 <MDL	250	120
11	A	1100	1400	0.2 ≤W	0.4	350	150
11	B	1200	1400	0.2 ≤W	0.2 <MDL	400	150
12	A	950	2200	0.2 ≤W	0.2 <MDL	250	110
12	B	1100	2300	0.2 ≤W	0.2 <MDL	250	100
13	A	750	750	0.3 <T	0.2 <MDL	200	170
13	B	750	750	0.3 <T	0.2 <T	200	140
14	A	1100	1500	0.2 ≤W	0.2 <MDL	150	58
14	B	850	1300	0.2 ≤W	0.2 <MDL	150	56
15	A	1000	1100	0.3 <T	0.2 <MDL	200	110
15	B	1200	1000	0.2 ≤W	0.2 <MDL	200	130
16	A	950	1700	0.2 ≤W	0.2 <MDL	200	69
16	B	1000	1700	0.2 ≤W	0.2 <MDL	200	69
17	A	1100	1100	0.4 <T	0.2 <MDL	200	110
17	B	1200	1200	0.5 <T	0.2 <MDL	200	110
18	A	1300	2000	0.3 <T	0.2 <MDL	200	130
18	B	1400	2400	0.4 <T	0.2 <MDL	200	140
19	A	1200	2200	0.3 <T	0.2 <MDL	200	85
19	B	1300	1900	0.4 <T	0.2 <MDL	200	89
20	A	1400	2400	0.4 <T	0.2 <MDL	250	99
20	B	1100	2200	0.3 <T	0.2 <MDL	250	98
Maximum		2000	2800	1	1.6	800	170
MOE Table 9		NV	NV	1.5	0.5	NA	NV
MOE Table 3		NV	NV	2.4	20	NA	NV

Table A continued: Element concentrations (ug/g) in surface soil (0-5 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Sulphur	Thallium	Tin	Titanium	Vanadium	Zinc
1	A	50	10**	2.5 <MDL	130	12	81
1	B	50	10**	5	140	9.8	67
2	A	700	5 <MDL	2.5 <MDL	610	27	51
2	B	1200	5 <MDL	2.5 <MDL	450	23	48
3	A	400	5 <MDL	2.5 <MDL	580	27	140
3	B	450	5 <MDL	2.5 <MDL	550	25	110
4	A	3900	30**	2.5 <MDL	240	26	250
4	B	2700	30**	5	290	28	240
5	A	150	5 <MDL	2.5 <MDL	480	22	130
5	B	350	5 <MDL	5	540	25	110
6	A	2400	35**	5	380	29	660**
6	B	1400	30**	2.5 <MDL	350	27	560**
7	A	500	5 <MDL	2.5 <MDL	550	25	64
7	B	50	5 <MDL	2.5 <MDL	630	28	71
8	A	500	5 <MDL	2.5 <MDL	520	23	67
8	B	50	5 <MDL	2.5 <MDL	570	25	68
9	A	250	5 <MDL	7.5	490	27	410**
9	B	150	5 <MDL	5	480	24	360**
10	A	450	5 <MDL	2.5 <MDL	710	29	79
10	B	500	5 <MDL	2.5 <MDL	730	30	84
11	A	850	5 <MDL	15	450	26	900**
11	B	800	5 <MDL	18	420	27	980**
12	A	50	5 <MDL	2.5 <MDL	610	27	110
12	B	500	5 <MDL	2.5 <MDL	660	29	110
13	A	450	5 <MDL	5	340	17	160
13	B	300	5 <MDL	2.5 <MDL	360	16	120
14	A	100	5 <MDL	2.5 <MDL	580	29	84
14	B	500	5 <MDL	2.5 <MDL	570	28	79
15	A	50	5 <MDL	2.5 <MDL	410	19	140
15	B	200	5 <MDL	2.5 <MDL	380	18	130
16	A	400	5 <MDL	2.5 <MDL	560	27	71
16	B	450	5 <MDL	2.5 <MDL	610	30	72
17	A	650	5 <MDL	5	350	21	320*
17	B	900	5 <MDL	5	340	21	400**
18	A	450	5 <MDL	5	470	25	260
18	B	700	5 <MDL	7.5	460	28	340*
19	A	500	5 <MDL	63	550	33	430**
19	B	350	5 <MDL	35	540	31	280
20	A	450	5 <MDL	5	630	34	220
20	B	350	5 <MDL	5	600	32	190
Maximum		3900	35	63	730	34	980
MOE Table 9		NV	1	NV	NV	86	290
MOE Table 3		NV	1	NV	NV	86	340

Table B: Element concentrations (ug/g) in surface soil (5-10 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Aluminum	Antimony	Arsenic	Barium	Beryllium	Boron
1	A	6000	0.5	4.2	140	0.43	14
1	B	5000	0.4	3.9	120	0.38	9.8
2	A	12000	0.2	2	120	0.53	10
2	B	19000	0.2	3.5	190	0.85	13
3	A	9400	0.3	2.8	110	0.5	8
3	B	9800	3.8*	3.3	140	0.6	13
4	A	3500	7.6**	15	140	0.53	7.5
4	B	3900	6.2*	16	130	0.35	9.5
5	A	7400	1.6*	2.4	110	0.4	11
5	B	8200	1	2.2	110	0.43	12
6	A	5900	6.2*	23**	610**	0.93	18
6	B	7000	10**	30**	1100**	0.88	18
7	A	9300	0.3	5.9	89	0.5	11
7	B	10000	0.3	7.3	110	0.58	12
8	A	7400	0.2	1.9	51	0.35	8.8
8	B	8000	0.2	2.1	55	0.4	9.5
9	A	17000	3.7*	4.6	2800**	0.53	28
9	B	18000	22**	5.8	2900**	0.45	29
10	A	10000	0.4	2.3	140	0.45	9.8
10	B	10000	0.4	2.1	130	0.45	10
11	A	12000	8**	6.5	3100**	0.43	18
11	B	16000	8.2**	4.7	3200**	0.35	23
12	A	11000	0.7	2.1	82	0.35	9.3
12	B	11000	0.4	2.7	100	0.38	9.5
13	A	5800	1.1	10	120	0.25	22
13	B	5900	1	9.9	180	0.3	20
14	A	8800	0.4	2.2	73	0.28	7
14	B	9000	0.4	2.2	68	0.25	6.8
15	A	5200	0.7	2.9	190	0.2	10
15	B	5100	0.7	3	160	0.2	9.8
16	A	11000	0.3	2.4	63	0.45	7.3
16	B	9700	0.3	2.1	59	0.38	6.3
17	A	5900	1.4*	5.5	310**	0.4	12
17	B	6900	2*	7.6	420**	0.48	15
18	A	11000	1.4*	9.9	510**	0.68	17
18	B	9300	1.7*	11	620**	0.65	14
19	A	9100	1.5*	9.2	430**	0.7	11
19	B	8100	1.4*	7.5	450**	0.53	10
20	A	10000	0.6	3.4	160	0.5	13
20	B	9800	0.7	4.9	180	0.55	14
Maximum		19000	22	30	3200	0.93	29
MOE Table 9		NV	1.3	18	220	2.5	36
MOE Table 3		NV	7.5	18	390	4	120

Table B continued: Element concentrations (ug/g) in surface soil (5-10 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Cadmium	Calcium	Chromium	Cobalt	Copper	Iron
1	A	0.6	250000	59	3.1	21	8600
1	B	0.5	260000	41	2.7	20	7700
2	A	0.2	98000	48	4.9	21	13000
2	B	0.2	210000	59	8.9	28	26000
3	A	0.2	68000	620**	5	26	17000
3	B	0.5	78000	1300**	5.4	30	17000
4	A	0.2	92000	33000**	7.6	41	68000
4	B	1.2	82000	34000**	7.9	40	67000
5	A	0.3	98000	2700**	4.1	20	19000
5	B	0.3	92000	1700**	4.5	20	14000
6	A	5.9**	94000	38000**	8.6	66	61000
6	B	6.2**	100000	34000**	8.8	83	49000
7	A	0.2	110000	650**	5.3	19	17000
7	B	0.2	110000	690**	6.1	19	19000
8	A	0.1 <MDL	110000	150*	4	11	13000
8	B	0.1 <MDL	120000	200**	4.3	12	14000
9	A	2.4**	77000	7700**	5	290**	26000
9	B	3.4**	70000	2800**	5.1	410**	31000
10	A	0.5	100000	430**	5.3	22	18000
10	B	0.5	98000	310**	5.4	21	17000
11	A	4.4**	69000	3100**	5.4	210**	32000
11	B	3.6**	64000	4400**	4.8	230**	28000
12	A	0.3	73000	110*	5.1	18	16000
12	B	0.4	73000	190**	5.6	21	17000
13	A	0.6	34000	1100**	4.7	97*	67000
13	B	1.3**	48000	2500**	4.8	82	53000
14	A	0.3	37000	520**	3.5	14	16000
14	B	0.3	36000	390**	3.5	13	15000
15	A	0.9	79000	2100**	2.9	26	11000
15	B	0.9	79000	1900**	2.9	22	11000
16	A	0.2	53000	130*	4.7	15	17000
16	B	0.2	55000	130*	4.2	13	17000
17	A	3.4**	70000	4100**	3.7	41	15000
17	B	3.2**	60000	3800**	4.4	42	15000
18	A	3**	88000	5100**	5.4	48	21000
18	B	3.2**	91000	5600**	5	56	20000
19	A	2.4**	72000	8100**	5.7	56	21000
19	B	3.1**	78000	8000**	4.4	46	17000
20	A	0.7	76000	970**	5.7	25	19000
20	B	1.1	68000	1200**	6.2	34	20000
Maximum		6.2	260000	38000	8.9	410	68000
MOE Table 9		1.2	NV	70	22	92	NV
MOE Table 3		1.2	NV	160	22	140	NV

Table B continued: Element concentrations (ug/g) in surface soil (5-10 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Lead	Magnesium	Manganese	Mercury	Molybdenum	Nickel
1	A	51	2400	220	0.06	0.5 <MDL	16
1	B	43	2300	190	0.07	0.5 <MDL	14
2	A	38	4400	260	0.02 <T	0.5 <MDL	16
2	B	27	8600	520	0.03 <T	0.5 <MDL	25
3	A	640**	4300	430	0.06	0.5 <MDL	14
3	B	97	4500	480	0.07	0.5 <MDL	17
4	A	570**	4300	380	1.5**	20**	190**
4	B	570**	4300	420	1.6**	19**	180**
5	A	120	5600	300	0.06	1.5	28
5	B	85	5100	350	0.06	1	15
6	A	790**	5000	440	1.2**	24**	200**
6	B	770**	5600	460	1.5**	17**	160**
7	A	32	5800	310	0.04 <T	0.5 <MDL	15
7	B	34	5900	320	0.04 <T	0.5 <MDL	16
8	A	21	7200	290	0.03 <T	0.5 <MDL	20
8	B	23	7500	310	0.04 <T	0.5 <MDL	24
9	A	420**	3800	340	0.13	8.5**	40
9	B	780**	3800	360	0.14	12**	61
10	A	88	6300	350	0.04 <T	0.5 <MDL	15
10	B	54	6300	340	0.05	0.5 <MDL	15
11	A	710**	3700	280	0.35**	8**	32
11	B	780**	3700	300	0.44**	8.5**	33
12	A	47	5700	390	0.02 <T	0.5 <MDL	19
12	B	54	5900	430	0.03 <T	0.5 <MDL	24
13	A	36	2900	1300	0.04 <T	13**	37
13	B	54	3200	930	0.04 <T	8.5**	34
14	A	36	4200	280	0.04 <T	0.5 <MDL	12
14	B	36	4300	310	0.05	0.5 <MDL	11
15	A	80	3800	240	0.08	0.5 <MDL	11
15	B	76	3900	240	0.08	0.5 <MDL	11
16	A	52	4200	350	0.04 <T	0.5 <MDL	13
16	B	33	4000	340	0.05	0.5 <MDL	12
17	A	150**	3500	220	0.17	1	17
17	B	160**	3300	220	0.24	1.5	21
18	A	170**	5100	280	0.11	1	24
18	B	180**	4900	260	0.12	1	24
19	A	270**	4700	310	0.19	2	21
19	B	270**	4300	260	0.23	1	16
20	A	75	5800	340	0.11	0.5	27
20	B	100	5400	310	0.13	1	30
Maximum		790	8600	1300	1.6	24	200
MOE Table 9		120	NV	NV	0.27	2	82
MOE Table 3		120	NV	NV	0.27	6.9	100

Table B continued: Element concentrations (ug/g) in surface soil (5-10 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Phosphorus	Potassium	Selenium	Silver	Sodium	Strontium
1	A	1200	750	0.8 <T	0.2 <MDL	150	100
1	B	1200	750	0.9 <T	0.2 <MDL	100	110
2	A	900	2000	1.1	0.2 <MDL	800	94
2	B	1400	3600	1.2	0.2 <MDL	1100	200
3	A	850	1600	0.2 ≤W	0.2 <MDL	250	93
3	B	1100	1700	0.2 ≤W	0.2 <MDL	250	94
4	A	3700	700	0.4 <T	1.6*	150	120
4	B	3600	750	0.5 <T	1*	100	110
5	A	1400	1300	0.2 ≤W	0.2 <MDL	250	110
5	B	1200	1500	0.2 ≤W	0.2 <MDL	250	110
6	A	1000	1200	0.8 <T	1.4*	150	160
6	B	1200	1300	1.1	0.2 <MDL	200	170
7	A	950	2400	0.2 ≤W	0.2 <MDL	250	150
7	B	950	2400	0.2 ≤W	0.2 <MDL	250	150
8	A	900	1800	0.2 ≤W	0.2 <MDL	250	150
8	B	1000	2000	0.2 ≤W	0.2 <MDL	250	160
9	A	1400	1200	0.2 ≤W	8.8*	900	150
9	B	1500	1100	0.2 ≤W	11*	1100	140
10	A	1000	2400	0.2 ≤W	0.2 <MDL	300	130
10	B	1100	2500	0.2 ≤W	0.2 <MDL	250	130
11	A	1100	1100	0.2 ≤W	0.4	550	170
11	B	1300	1200	0.2 ≤W	0.6	750	160
12	A	1000	2200	0.2 ≤W	0.2 <MDL	250	100
12	B	1100	2300	0.2 ≤W	0.2 <MDL	250	100
13	A	500	550	0.3 <T	0.2 <MDL	200	180
13	B	800	700	0.3 <T	0.2 <MDL	200	170
14	A	900	1100	0.2 ≤W	0.2 <MDL	150	57
14	B	950	1100	0.3 <T	0.2 <MDL	150	51
15	A	1100	850	0.2 ≤W	0.2 <MDL	200	120
15	B	1100	850	0.2 ≤W	0.2 <MDL	200	120
16	A	800	1700	0.2 ≤W	0.2 <MDL	200	74
16	B	850	1400	0.2 ≤W	0.2 <MDL	200	74
17	A	1000	950	0.3 <T	0.2 <MDL	200	120
17	B	1100	1000	0.5 <T	0.2 <MDL	200	110
18	A	1500	2200	0.4 <T	0.2 <MDL	250	140
18	B	1000	1800	0.4 <T	0.2 <MDL	200	160
19	A	1500	1800	0.3 <T	0.2 <MDL	200	120
19	B	1200	1600	0.4 <T	0.2 <MDL	250	120
20	A	950	2100	0.3 <T	0.2 <MDL	250	100
20	B	1200	1900	0.4 <T	0.2 <MDL	250	110
Maximum		3700	3600	1.2	11	1100	200
MOE Table 9		NV	NV	1.5	0.5	NA	NV
MOE Table 3		NV	NV	2.4	20	NA	NV

Table B continued: Element concentrations (ug/g) in surface soil (5-10 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Sulphur	Thallium	Tin	Titanium	Vanadium	Zinc
1	A	50	10**	2.5 <MDL	160	15	100
1	B	50	10**	2.5 <MDL	120	13	78
2	A	1300	5 <MDL	2.5 <MDL	490	24	50
2	B	1400	10**	2.5 <MDL	770	40	75
3	A	400	5 <MDL	2.5 <MDL	650	28	88
3	B	200	5 <MDL	7.5	660	29	110
4	A	3400	35**	2.5 <MDL	250	29	190
4	B	3200	30**	2.5 <MDL	270	27	210
5	A	150	5 <MDL	2.5 <MDL	480	25	180
5	B	100	5 <MDL	2.5 <MDL	500	24	99
6	A	3100	35**	2.5 <MDL	360	27	480**
6	B	2100	35**	2.5 <MDL	370	29	840**
7	A	450	5 <MDL	2.5 <MDL	660	28	71
7	B	500	5 <MDL	2.5 <MDL	720	30	72
8	A	400	5 <MDL	2.5 <MDL	610	25	52
8	B	450	5 <MDL	2.5 <MDL	660	26	58
9	A	1200	5 <MDL	23	490	37	1100**
9	B	700	5 <MDL	40	560	42	1100**
10	A	400	5 <MDL	2.5 <MDL	740	30	95
10	B	450	5 <MDL	2.5 <MDL	690	30	88
11	A	950	5 <MDL	25	490	30	1500**
11	B	1200	5 <MDL	25	540	34	1600**
12	A	400	5 <MDL	2.5 <MDL	660	28	100
12	B	450	5 <MDL	2.5 <MDL	690	29	130
13	A	400	5 <MDL	5	380	17	100
13	B	400	5 <MDL	5	380	19	140
14	A	450	5 <MDL	2.5 <MDL	530	29	76
14	B	450	5 <MDL	2.5 <MDL	450	27	77
15	A	50	5 <MDL	2.5 <MDL	400	18	140
15	B	50	5 <MDL	5	390	18	120
16	A	350	5 <MDL	2.5 <MDL	670	32	71
16	B	300	5 <MDL	2.5 <MDL	570	28	66
17	A	250	5 <MDL	5	440	21	230
17	B	400	5 <MDL	5	390	23	320**
18	A	550	5 <MDL	7.5	520	29	360**
18	B	350	10**	7.5	460	27	370**
19	A	600	10**	53	520	31	470**
19	B	800	10**	58	460	27	490**
20	A	50	5 <MDL	2.5 <MDL	620	31	150
20	B	200	5 <MDL	5	580	32	170
Maximum		3400	35	58	770	42	1600
MOE Table 9		NV	1	NV	NV	86	290
MOE Table 3		NV	1	NV	NV	86	340

Table C: Element concentrations (ug/g) in surface soil (10-15 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Aluminum	Antimony	Arsenic	Barium	Beryllium	Boron
1	A	5100	0.4 <T	4.3	130	0.38	11
1	B	6300	0.3 <T	3.4	130	0.43	12
2	A	10000	0.2 ≤W	1.5	89	0.45	8
2	B	16000	0.2 ≤W	1.6	120	0.68	12
3	A	10000	0.5 <T	3.3	150	0.63	13
3	B	9200	0.6 <T	3.6	140	0.58	9.8
4	A	3900	8.5**	15	150	0.55	8.3
4	B	3900	8.2**	15	110	0.5	6.8
5	A	7100	1.5*	1.9	97	0.35	8.3
5	B	8000	1	2	110	0.4	8.5
6	A	7000	7.6**	23**	1300**	1	17
6	B	7100	7.4*	28**	1000**	1.1	10
7	A	9400	0.2 ≤W	2.4	88	0.45	9.3
7	B	9800	0.2 ≤W	4.3	89	0.5	8
8	A	6100	0.2 ≤W	1.7	49	0.33	6.3
8	B	7000	0.2 ≤W	1.8	52	0.35	7.8
9	A	13000	13**	18	1500**	1.2	30
9	B	9400	8.3**	20**	1400**	0.58	16
10	A	11000	0.5 <T	2.1	160	0.38	8.8
10	B	9600	0.6 <T	2.8	130	0.43	8.5
11	A	14000	6.5*	5.8	3300**	0.53	20
11	B	12000	7.3*	6.6	1600**	0.43	22
12	A	11000	0.4 <T	2.2	88	0.33	7.8
12	B	11000	0.4 <T	2.2	90	0.35	7.3
13	A	5000	0.8 <T	7.2	170	0.18	18
13	B	5200	1	7.8	160	0.23	16
14	A	10000	0.3 <T	2.3	56	0.28	6
14	B	10000	0.3 <T	2.4	59	0.3	5.8
15	A	5100	0.6 <T	2.5	190	0.3	9
15	B	4800	0.6 <T	2.8	180	0.28	8.5
16	A	9100	0.2 ≤W	1.7	52	0.38	5.3
16	B	8800	0.3 <T	2.2	52	0.35	4.8
17	A	5600	1.7*	4.8	220	0.38	10
17	B	6200	2.3*	6.4	630**	0.43	14
18	A	19000	6.3*	11	1000**	1.3	25
18	B	9900	2.3*	26**	1100**	0.68	13
19	A	7100	9.2**	11	540**	0.58	12
19	B	7400	8.8**	14	450**	0.53	8.8
20	A	11000	0.7 <T	6.6	450**	0.65	13
20	B	9200	1.3	8.5	240*	0.58	10
Maximum		19000	13	28	3300	1.3	30
MOE Table 9		NV	1.3	18	220	2.5	36
MOE Table 3		NV	7.5	18	390	4	120

Table C continued: Element concentrations (ug/g) in surface soil (10-15 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Cadmium	Calcium	Chromium	Cobalt	Copper	Iron
1	A	0.5	270000	42	2.7	19	7200
1	B	0.5	260000	47	3	19	8600
2	A	0.1 <MDL	110000	32	4.6	14	13000
2	B	0.1 <MDL	140000	49	6.1	22	16000
3	A	0.4	70000	1400**	5.6	34	16000
3	B	0.4	74000	1100**	5	27	16000
4	A	1.7**	94000	34000**	8.2	50	74000
4	B	0.6	100000	27000**	7.3	33	55000
5	A	0.2	100000	2500**	3.9	15	19000
5	B	0.4	87000	2500**	4.2	17	15000
6	A	7**	120000	38000**	8.9	81	59000
6	B	5.3**	120000	31000**	10	73	59000
7	A	0.1 <MDL	120000	210**	5.3	14	16000
7	B	0.1 <MDL	120000	300**	5.9	15	18000
8	A	0.1 <MDL	110000	110*	3.6	9	12000
8	B	0.1 <MDL	120000	140*	4	14	13000
9	A	2**	80000	32000**	6.9	660**	34000
9	B	1	83000	11000**	6.6	110*	26000
10	A	0.4	100000	480**	5.5	24	18000
10	B	0.4	91000	210**	4.7	17	16000
11	A	4	66000	4900**	6.8	230**	33000
11	B	5.2**	63000	8400**	6.7	240**	32000
12	A	0.2	74000	72*	5.3	18	16000
12	B	0.3	68000	100*	5.2	17	17000
13	A	0.5	32000	1400**	4.2	82	55000
13	B	0.9	56000	2400**	4.1	64	40000
14	A	0.2	32000	210**	3.8	11	17000
14	B	0.2	28000	190**	3.8	10	17000
15	A	0.7	85000	2500**	2.8	32	11000
15	B	1.8**	82000	2100**	2.6	28	11000
16	A	0.2	56000	55	3.9	31	16000
16	B	0.1 <MDL	58000	44	3.9	11	16000
17	A	4.8**	81000	5100**	3.5	40	13000
17	B	5.1**	75000	7600**	3.5	67	17000
18	A	5.7**	180000	9500**	11	110*	39000
18	B	4.2**	98000	7400**	5.4	65	23000
19	A	9**	140000	39000**	3	130*	12000
19	B	5.3**	110000	25000**	3.8	81	15000
20	A	4**	72000	7000**	6.6	43	21000
20	B	0.9	68000	1200**	6.1	29	21000
Maximum		9	270000	39000	11	660	74000
MOE Table 9		1.2	NV	70	22	92	NV
MOE Table 3		1.2	NV	160	22	140	NV

Table C continued: Element concentrations (ug/g) in surface soil (10-15 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Lead	Magnesium	Manganese	Mercury	Molybdenum	Nickel
1	A	40	2200	200	0.05	0.5 <MDL	13
1	B	45	2400	210	0.07	0.5 <MDL	14
2	A	8.5	4600	220	0.02 <T	0.5 <MDL	12
2	B	7.5	5900	240	0.03 <T	0.5 <MDL	18
3	A	68	4300	470	0.07	1	18
3	B	55	4600	450	0.08	0.5 <MDL	15
4	A	590**	4400	460	1**	23**	210**
4	B	480**	4800	410	1.3**	18**	140**
5	A	110	5700	310	0.05	1	24
5	B	94	5500	350	0.05	1	12
6	A	880**	5500	460	1.3**	24**	200**
6	B	710**	6000	490	1.3**	22**	240**
7	A	23	6100	330	0.03 <T	0.5 <MDL	14
7	B	42	5800	330	0.04 <T	0.5 <MDL	15
8	A	18	6800	270	0.02 <T	0.5 <MDL	12
8	B	23	6800	280	0.03 <T	0.5 <MDL	21
9	A	250**	3000	340	0.08	17**	28
9	B	180**	4200	310	0.09	6**	35
10	A	89	6700	360	0.04 <T	0.5 <MDL	15
10	B	62	6000	330	0.05	0.5 <MDL	13
11	A	1100**	3800	300	0.46**	11**	35
11	B	790**	3700	300	0.64**	11**	35
12	A	74	5700	390	0.02 <T	0.5 <MDL	20
12	B	85	5500	380	0.03 <T	0.5 <MDL	19
13	A	37	2300	1000	0.03 <T	8.5**	36
13	B	40	3200	750	0.04 <T	6*	28
14	A	31	3700	290	0.04 <T	0.5 <MDL	11
14	B	31	3500	310	0.05	1	14
15	A	79	3800	230	0.07	0.5 <MDL	10
15	B	75	3800	220	0.09	0.5 <MDL	10
16	A	32	3800	370	0.04 <T	0.5 <MDL	12
16	B	27	3900	350	0.05	0.5 <MDL	10
17	A	150**	4000	210	0.08	0.5 <MDL	14
17	B	220**	3800	230	0.52**	1.5	18
18	A	340**	9700	530	0.13	2.5*	49
18	B	260**	5000	280	0.14	1	26
19	A	370**	4100	350	0.1	3*	12
19	B	290**	4600	280	0.13	1.5	13
20	A	150**	5600	340	0.09	1.5	30
20	B	110	4700	270	0.13	0.5	25
Maximum		1100	9700	1000	1.3	24	240
MOE Table 9		120	NV	NV	0.27	2	82
MOE Table 3		120	NV	NV	0.27	6.9	100

Table C continued: Element concentrations (ug/g) in surface soil (10-15 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Phosphorus	Potassium	Selenium	Silver	Sodium	Strontium
1	A	1100	650	0.7 <T	0.2 <MDL	100	110
1	B	1100	850	0.9 <T	0.4	150	100
2	A	850	2100	0.6 <T	0.2 <MDL	550	110
2	B	1100	3100	0.7 <T	0.2 <MDL	600	130
3	A	900	1800	0.2 ≤W	0.2 <MDL	250	89
3	B	900	1500	0.2 <W	0.2 <MDL	250	95
4	A	2700	750	0.3 <T	1.6*	150	120
4	B	750	650	0.4 <T	0.4	150	120
5	A	1100	1200	0.2 ≤W	0.2 <MDL	200	120
5	B	1200	1300	0.2 ≤W	0.2 <MDL	200	110
6	A	3300	1200	0.7 <T	1*	250	200
6	B	50	1300	0.7 <T	1*	250	190
7	A	1000	2300	0.2 ≤W	0.2 <MDL	250	160
7	B	900	2200	0.2 ≤W	0.2 <MDL	250	160
8	A	1000	1500	0.2 ≤W	0.2 <MDL	250	150
8	B	750	1600	0.2 ≤W	0.2 <MDL	250	150
9	A	50	850	0.2 ≤W	4.6*	700	210
9	B	800	850	0.2 ≤W	0.8*	500	180
10	A	950	2200	0.2 ≤W	0.2 <MDL	300	140
10	B	950	2200	0.2 ≤W	0.2 <MDL	300	130
11	A	1200	1000	0.2 ≤W	0.6*	700	180
11	B	1400	1000	0.2 ≤W	0.6*	700	170
12	A	850	2100	0.2 ≤W	0.2 <MDL	250	110
12	B	1000	2000	0.2 ≤W	0.2 <MDL	250	96
13	A	450	450	0.2 ≤W	0.2 <MDL	200	150
13	B	650	650	0.2 ≤W	0.2 <MDL	200	150
14	A	850	1100	0.2 ≤W	0.2 <MDL	150	48
14	B	750	1100	0.3 <T	0.2 <MDL	150	43
15	A	850	800	0.2 ≤W	0.2 <MDL	200	120
15	B	1000	750	0.2 ≤W	0.2 <MDL	200	120
16	A	850	1300	0.2 ≤W	0.2 <MDL	200	78
16	B	800	1200	0.2 ≤W	0.2 <MDL	200	77
17	A	1100	800	0.2 ≤W	0.2 <MDL	200	130
17	B	1300	900	0.2 ≤W	0.2 <MDL	200	140
18	A	2300	3500	0.3 <T	0.2 <MDL	450	360
18	B	1200	1700	0.7 <T	0.2 <MDL	250	180
19	A	1200	1000	0.2 ≤W	0.2 <MDL	350	190
19	B	2300	1200	0.2 ≤W	0.4	300	150
20	A	1200	1800	0.3 <T	0.2 <MDL	250	110
20	B	950	1500	0.3 <T	0.2 <MDL	200	120
Maximum		3300	3500	0.9	4.6	700	360
MOE Table 9		NV	NV	1.5	0.5	NA	NV
MOE Table 3		NV	NV	2.4	20	NA	NV

Table C continued: Element concentrations (ug/g) in surface soil (10-15 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Sulphur	Thallium	Tin	Titanium	Vanadium	Zinc
1	A	50	10**	2.5 <MDL	120	12	77
1	B	50	10**	2.5 <MDL	190	15	83
2	A	50	5 <MDL	2.5 <MDL	540	24	34
2	B	300	5 <MDL	2.5 <MDL	740	30	49
3	A	150	5 <MDL	2.5 <MDL	640	29	130
3	B	50	5 <MDL	2.5 <MDL	520	26	96
4	A	2700	35**	2.5 <MDL	250	25	210
4	B	1300	25**	2.5 <MDL	310	23	170
5	A	50	5 <MDL	2.5 <MDL	550	24	110
5	B	50	5 <MDL	2.5 <MDL	570	26	88
6	A	3200	35**	2.5 <MDL	380	24	910**
6	B	2500	35**	5	350	28	850**
7	A	300	5 <MDL	2.5 <MDL	690	28	56
7	B	250	5 <MDL	2.5 <MDL	640	28	50
8	A	250	5 <MDL	2.5 <MDL	570	24	36
8	B	300	5 <MDL	2.5 <MDL	590	26	52
9	A	2200	35**	7.5	500	34	880**
9	B	250	25**	2.5 <MDL	600	29	660**
10	A	350	5 <MDL	5	720	28	110
10	B	350	5 <MDL	2.5 <MDL	680	29	86
11	A	1200	5 <MDL	30	530	31	1800**
11	B	2700	5 <MDL	28	650	29	2000**
12	A	300	5 <MDL	2.5 <MDL	670	28	110
12	B	350	5 <MDL	2.5 <MDL	710	29	110
13	A	300	5 <MDL	5	330	15	96
13	B	300	5 <MDL	2.5 <MDL	380	16	100
14	A	350	5 <MDL	2.5 <MDL	650	31	64
14	B	350	5 <MDL	2.5 <MDL	670	32	63
15	A	50	5 <MDL	2.5 <MDL	410	18	140
15	B	50	5 <MDL	2.5 <MDL	390	18	130
16	A	200	5 <MDL	2.5 <MDL	590	28	97
16	B	200	5 <MDL	2.5 <MDL	550	26	57
17	A	50	5 <MDL	5	380	20	200
17	B	300	5 <MDL	7.5	380	20	450**
18	A	1400	10**	15	750	50	660**
18	B	650	10**	15	460	26	470**
19	A	750	35**	2.5 <MDL	340	24	510**
19	B	50	30**	28	470	24	420**
20	A	150	5 <MDL	2.5 <MDL	410	31	260
20	B	50	5 <MDL	2.5 <MDL	550	31	130
Maximum		3200	35	30	750	50	2000
MOE Table 9		NV	1	NV	NV	86	290
MOE Table 3		NV	1	NV	NV	86	340

Table D: Element concentrations (ug/g) in surface soil (15-30 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Aluminum	Antimony	Arsenic	Barium	Beryllium	Boron
1	A	3400	0.2 ≤W	1.7	110	0.28	6.5
1	B	4100	0.2 ≤W	2.1	110	0.3	7.5
2	A	11000	0.2 ≤W	1.4	90	0.5	8.3
2	B	12000	0.2 ≤W	1.3	93	0.55	8
3	A	20000	0.4 <T	2	130	0.93	18
3	B	10000	0.6 <T	4	64	0.45	9.3
4	A	4800	2.8*	4.2	87	0.35	7.3
4	B	5100	3.7*	4.5	62	0.33	6.3
5	A	5500	1	1.6	70	0.28	6
5	B	7700	0.9 <T	1.9	120	0.38	8.8
6	A	7400	6.8*	31	1300**	1.6	15
6	B	750	4.2*	43	130	0.15	1.5
7	A	8500	0.2 ≤W	2.3	65	0.43	7.5
7	B	11000	0.2 ≤W	3.7	85	0.5	9
8	A	7000	0.2 ≤W	1.7	57	0.35	7
8	B	6800	0.2 ≤W	1.9	58	0.35	6.8
9	A	6800	7.4*	37	810**	1.1	30
9	B	7500	6.9*	45	700**	1.6	24
11	A	16000	12**	5.6	2300**	0.38	24
11	B	14000	12**	5.8	930**	0.5	19
12	A	10000	0.5 <T	1.9	140	0.35	7.5
12	B	12000	0.3 <T	2	110	0.4	8.3
13	A	4200	0.8 <T	3.8	130	0.15	15
13	B	4400	0.8 <T	4.6	140	0.18	10
14	A	11000	0.2 ≤W	2.2	55	0.33	6.3
14	B	12000	0.3 <T	3.2	66	0.35	6.3
15	A	5300	0.6 <T	2.6	380*	0.3	9.5
15	B	4500	0.7 <T	3.2	330*	0.28	9.5
17	A	4000	0.6 <T	2	120	0.25	5.5
17	B	5200	1.3	3.8	1000**	0.33	10
18	A	9500	1.4*	20	470**	2	18
18	B	10000	1.4*	99	550**	0.95	11
19	A	5400	8.1**	12	520**	0.6	12
19	B	5800	8.3**	14	770**	0.58	17
20	A	12000	0.8 <T	2.2	590**	0.65	16
20	B	8500	0.6 <T	5.8	89	0.4	8.5
Maximum		20000	12	99	2300	2	30
MOE Table 9		NV	1.3	18	220	2.5	36
MOE Table 3		NV	7.5	18	390	4	120

Table D continued: Element concentrations (ug/g) in surface soil (15-30 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Cadmium	Calcium	Chromium	Cobalt	Copper	Iron
1	A	0.2	330000	26	1.9	11	4300
1	B	0.2	300000	31	2.2	13	5200
2	A	0.1 <MDL	130000	42	4.4	19	13000
2	B	0.1 <MDL	110000	36	5.6	17	16000
3	A	0.3	140000	610**	10	39	34000
3	B	0.2	76000	370**	5.3	19	17000
4	A	0.2	110000	11000**	4.8	46	27000
4	B	0.1 <MDL	100000	7300**	4.3	23	26000
5	A	0.1<MDL	110000	190**	3	9.6	12000
5	B	0.2	87000	4600**	4	17	14000
6	A	5.7**	120000	29000**	9.3	83	50000
6	B	1.4**	12000	2900**	1	9	4900
7	A	0.1 <MDL	130000	170**	5.5	17	16000
7	B	0.1 <MDL	110000	140*	6.1	14	17000
8	A	0.1 <MDL	130000	130*	4	11	14000
8	B	0.1 <MDL	120000	120*	3.8	11	15000
9	A	1.2	99000	31000**	6.3	160**	29000
9	B	0.2	96000	31000**	7.6	170**	34000
11	A	4.7**	68000	12000**	5.2	260**	35000
11	B	3**	81000	7100**	6.6	240**	31000
12	A	0.4	91000	45	5.3	17	16000
12	B	0.2	97000	51	5.7	15	17000
13	A	3.1**	60000	6200**	3.4	63	32000
13	B	1.1	70000	3000**	3.3	34	21000
14	A	0.2	36000	69	4.3	11	18000
14	B	0.2	29000	42	5	13	18000
15	A	0.7	96000	2800**	2.8	24	12000
15	B	0.7	99000	3100**	2.5	21	11000
17	A	2.6**	80000	3100**	2.3	17	9400
17	B	5.6**	89000	8000**	2.3	44	12000
18	A	1.7**	44000	2800**	8.5	50	31000
18	B	2.7**	99000	5300**	6.7	62	27000
19	A	12**	160000	48000**	1.7	150**	8400
19	B	11**	190000	56000**	1.9	170**	7400
20	A	1.1	62000	2100**	7.2	30	22000
20	B	0.5	92000	680**	4.6	24	16000
Maximum		12	330000	56000	10	260	50000
MOE Table 9		1.2	NV	70	22	92	NV
MOE Table 3		1.2	NV	160	22	140	NV

Table D continued: Element concentrations (ug/g) in surface soil (15-30 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Lead	Magnesium	Manganese	Mercury	Molybdenum	Nickel
1	A	14	2000	120	0.03 <T	0.5 <MDL	7.1
1	B	18	2000	140	0.03 <T	0.5 <MDL	8
2	A	3.5	4900	200	0.02 <T	0.5 <MDL	14
2	B	2	5800	260	0.02 <T	0.5 <MDL	15
3	A	120	9500	920	0.05	2	29
3	B	140**	4800	480	0.06	1	14
4	A	310**	5500	350	0.29**	8**	65
4	B	260**	5200	350	0.35**	5.5*	46
5	A	60	5400	280	0.03 <T	0.5 <MDL	8.2
5	B	120	6000	360	0.06	1.5	13
6	A	630**	5300	400	0.61	12	180**
6	B	63	550	43	0.73	1.5	22
7	A	20	5800	340	0.03 <T	0.5 <MDL	15
7	B	31	5600	340	0.04 <T	0.5 <MDL	14
8	A	26	7500	300	0.02 <T	0.5 <MDL	12
8	B	25	7200	290	0.03 <T	0.5 <MDL	13
9	A	110	2900	250	0.08	10**	22
9	B	110	3300	250	0.35**	9**	23
11	A	870**	3300	320	0.44**	16**	34
11	B	720**	3500	330	0.63**	9.5**	35
12	A	180**	8300	490	0.01 ≤W	0.5 <MDL	19
12	B	160**	6800	400	0.01 ≤W	0.5 <MDL	17
13	A	89	2900	640	0.03 <T	4.5*	26
13	B	50	3600	390	0.04 <T	2	19
14	A	27	3500	320	0.06	0.5 <MDL	13
14	B	31	3700	350	0.08	0.5 <MDL	15
15	A	83	4100	250	0.05	0.5 <MDL	10
15	B	79	3900	220	0.08	0.5 <MDL	8.5
17	A	86	4000	200	0.05	0.5 <MDL	12
17	B	200**	3900	210	0.21	0.5 <MDL	16
18	A	100	2200	240	0.11	4.5*	31
18	B	200**	5200	280	0.23	2.5*	26
19	A	440**	3700	260	0.08	1.5	7.9
19	B	490**	3600	220	0.08	4	8.2
20	A	72	6400	350	0.06	1	32
20	B	75	5600	310	0.09	0.5 <MDL	21
Maximum		870	9500	920	0.73	16	180
MOE Table 9		120	NV	NV	0.27	2	82
MOE Table 3		120	NV	NV	0.27	6.9	100

Table D continued: Element concentrations (ug/g) in surface soil (15-30 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Phosphorus	Potassium	Selenium		Silver	Sodium	Strontium
1	A	400	500	0.4	<T	0.2 <MDL	100	110
1	B	450	550	0.5	<T	0.2 <MDL	100	110
2	A	800	2100	0.3	<T	0.2 <MDL	550	130
2	B	850	2500	0.6	<T	0.2 <MDL	500	130
3	A	1800	3500	0.2	≤W	0.2 <MDL	550	170
3	B	950	1700	0.2	≤W	0.2 <MDL	250	96
4	A	1400	950	0.2	≤W	0.2<MDL	200	130
4	B	1000	1100	0.2	≤W	0.2 <MDL	200	130
5	A	900	1100	0.2	≤W	0.2 <MDL	200	130
5	B	1200	1200	0.2	≤W	0.2 <MDL	200	110
6	A	800	1200	0.6	<T	0.4 <MDL	300	190
6	B	200	100	0.8	<T	0.2 <MDL	50	21
7	A	1000	1900	0.2	≤W	0.2 <MDL	250	160
7	B	750	2200	0.2	≤W	0.2 <MDL	250	150
8	A	950	1600	0.2	≤W	0.2 <MDL	300	160
8	B	850	1600	0.2	≤W	0.2 <MDL	300	150
9	A	50	750	0.5	<T	2*	450	220
9	B	50	800	0.6	<T	0.6*	400	210
11	A	1600	850	0.2	≤W	1.2*	1000	190
11	B	1400	950	0.2	≤W	0.6*	800	180
12	A	950	2000	0.2	≤W	0.2	300	120
12	B	1000	2500	0.2	≤W	0.2 <MDL	300	130
13	A	750	550	0.2	≤W	0.2 <MDL	200	140
13	B	650	650	0.2	≤W	0.2 <MDL	200	130
14	A	750	1300	0.2	≤W	0.2 <MDL	150	55
14	B	800	1500	0.2	≤W	0.2 <MDL	200	48
15	A	1000	850	0.2	≤W	0.2 <MDL	250	140
15	B	950	700	0.2	≤W	0.2 <MDL	250	140
17	A	850	650	0.2	≤W	0.2 <MDL	150	110
17	B	1300	800	0.2	≤W	0.2 <MDL	250	140
18	A	800	1400	0.4	<T	0.2 <MDL	200	220
18	B	1200	1500	0.9	<T	0.2 <MDL	400	190
19	A	1700	550	0.2	≤W	0.4	400	180
19	B	3500	550	0.2	≤W	0.8	400	180
20	A	950	2300	0.2	≤W	0.2 <MDL	300	110
20	B	950	1500	0.3	<T	0.2 <MDL	200	120
Maximum		3500	3500	0.9		2	1000	220
MOE Table 9		NV	NV	1.5		0.5	NA	NV
MOE Table 3		NV	NV	2.4		20	NA	NV

Table D continued: Element concentrations (ug/g) in surface soil (15-30 cm) collected from 20 sites on the property of the former Robson-Lang tannery, Oshawa, Ontario

Site	Replicate	Sulphur	Thallium	Tin	Titanium	Vanadium	Zinc
1	A	50	10**	2.5 <MDL	120	6.8	43
1	B	50	10**	2.5 <MDL	100	8	49
2	A	50	5 <MDL	2.5 <MDL	590	23	35
2	B	350	5 <MDL	2.5 <MDL	770	28	39
3	A	50	5 <MDL	5	1400	56	130
3	B	400	5 <MDL	2.5 <MDL	780	29	66
4	A	950	10**	5	400	24	140
4	B	300	5 <MDL	10	490	21	120
5	A	250	5 <MDL	2.5 <MDL	550	21	41
5	B	50	5 <MDL	2.5 <MDL	440	25	93
6	A	100	40**	10	430	28	810**
6	B	450	5 <MDL	2.5 <MDL	41	2.5	84
7	A	200	5 <MDL	2.5 <MDL	610	27	45
7	B	150	5 <MDL	2.5 <MDL	790	31	49
8	A	250	5 <MDL	2.5 <MDL	680	27	46
8	B	250	5 <MDL	2.5 <MDL	690	26	43
9	A	450	30**	2.5 <MDL	420	26	270
9	B	750	35**	2.5 <MDL	450	24	220
11	A	1800	5 <MDL	33	480	30	2000**
11	B	3500	5 <MDL	43	520	32	1400**
12	A	250	5 <MDL	2.5 <MDL	660	28	120
12	B	200	5 <MDL	2.5 <MDL	760	29	81
13	A	150	5 <MDL	2.5 <MDL	400	14	110
13	B	50	5 <MDL	2.5 <MDL	460	17	85
14	A	300	5 <MDL	2.5 <MDL	670	33	69
14	B	250	5 <MDL	2.5 <MDL	770	34	72
15	A	50	5 <MDL	5	470	19	180
15	B	50	5 <MDL	2.5 <MDL	420	17	160
17	A	50	5 <MDL	2.5 <MDL	370	18	120
17	B	600	10**	5	360	18	570*
18	A	600	10**	5	570	35	250
18	B	150	10**	7.5	540	32	330*
19	A	1500	40**	2.5 <MDL	200	17	530**
19	B	2300	45**	2.5 <MDL	180	14	600**
20	A	250	5 <MDL	5	720	34	230
20	B	350	5 <MDL	2.5 <MDL	590	27	91
Maximum		3500	45	43	1400	56	2000
MOE Table 9		NV	1	NV	NV	86	290
MOE Table 3		NV	1	NV	NV	86	340

References

Adriano, D.C., 2001. Trace Elements in Terrestrial Environments: Biogeochemistry, Bioavailability, and Risk of Metals. Springer, New York, pp. 867.

Conrad, E.T., G.L. Mitchell, and D.H. Bauer. 1976. Leather Tanning and Finishing Industry: Assessment of Industrial Hazardous Waste Practices. Contract No. 6801-3261. U.S. Environmental Protection Agency, 1976.

PGL, 2007. Surface and Groundwater Sampling 100 Whiting Avenue, Oshawa, Ontario. PGL File:3174-01.01. Prepared for: Central Lake Ontario Conservation Authority by Pottinger Gaherty Environmental Consultants Ltd., December 2007.

Pratt, P.F., 1966. Chromium. In H.D. Chapman ed., Diagnostic Criteria for Plants and Soils. Quality Printing Company Inc., Abilene, Texas.

Weymark, J., 2009. The Village of Cedar Dale. The Oshawa Express, March 4, 2009

Appendix A

Table A1: Site numbers and Universal Transverse Mercator coordinates (UTMs) for MOE soil sampling sites on the former Robson-Lang tannery property

Site	Zone	Easting	Northing
1	17	672909	4859968
2	17	672921	4860002
3	17	672835	4860002
4	17	672831	4860042
5	17	672784	4860027
6	17	672779	4860053
7	17	672713	4860066
8	17	672751	4860111
9	17	672720	4859982
10	17	672683	4860025
11	17	672712	4859965
12	17	672670	4859993
13	17	672662	4859963
14	17	672620	4860038
15	17	672589	4860009
16	17	672631	4860049
17	17	672527	4860047
18	17	672550	4860078
19	17	672557	4860086
20	17	672530	4860125

PIBS 8680e