_id	Variable	Variable Description
1	SampleID	Anonymous Sample Identifier (Each Sample ID represents a soil sample from a unique residential property in Detroit metropolitan area)
2	FillStatus	Description of the type of soil sampled
3	FillType	Numerical classification of the type of soil sampled
4	TotalPb	Total soil lead concentration (mg/kg) of soils µm size extracted following US EPA Method 3051a and quantified by inductively couple mass spectrometry
5	IVBAmgkg	Concentration (mg/kg) of In vitro bioaccessible lead of soils µm size extracted according to a modified (pH = 2) version of the Physiologically Based Extraction Test (PBET) (Ruby et al. 1996) and quantified by inductively couple-mass spectrometry
6	IVBAperc	Percentage (%) of IVBA lead (IVBA/TotalPb∑100)
7	Pppm	Concentration of phosphorus (mg/kg) of (Mehlich 1984) and quantified using inductively coupled plasma optical emission spectroscopy (ICP-OES). For soils with a pH less than than 7.3, the Bray 1 equivalent P concentration is reported.
8	pH	Soil pH measured in 1:1 soil water slurry by Dairyland Laboratories (Arcadia, WI) on soil
9	OM	Soil organic matter content (%) measured by loss on ignition (Davies 1974) by Dairyland Laboratories (Arcadia, WI) on soil
10	CEC	Cation exhange capacity (cmol+/kg) is the summ of Ca, Mg, K, and the acidity of soil as measured by Dairyland Laboratories (Arcadia, WI) on soil
11	Cappm	Concentration of calcium (mg/kg) of (Mehlich 1984) and quantified using inductively coupled plasma optical emission spectroscopy (ICP-OES)
12	Kppm	Concentration of potassium (mg/kg) of (Mehlich 1984) and quantified using inductively coupled plasma optical emission spectroscopy (ICP-OES)
13	Mgppm	Concentration of magnesium (mg/kg) of (Mehlich 1984) and quantified using inductively coupled plasma optical emission spectroscopy (ICP-OES)
14	Sppm	Concentration of sulfur (mg/kg) of (Mehlich 1984) and quantified using inductively coupled plasma optical emission spectroscopy (ICP-OES)
15	Nappm	Concentration of sodium (mg/kg) of (Mehlich 1984) and quantified using inductively coupled plasma optical emission spectroscopy (ICP-OES)
16	SoilTexture	Soil texture classification determeined by feel as per an NRCS method (Burt 2014) for soils sieved DLsand: Percentage (%) sand based on particle size analysis via gravimetric hydration (Burt 2014) perfomed at Dairyland Laboratories (Arcadia, WI)
17	DLsilt	Percentage (%) silt based on particle size analysis via gravimetric hydration (Burt 2014) perfomed at Dairyland Laboratories (Arcadia, WI)
18	DLclay	Percentage (%) clay based on particle size analysis via gravimetric hydration (Burt 2014) perfomed at Dairyland Laboratories (Arcadia, WI)
19	DLtexture	Soil texture classificaiton based on particle size analysis via gravimetric hydration (Burt 2014) perfomed at Dairyland Laboratories (Arcadia, WI)
20	DistSmelt	Minimum distance (km) to 1 of 19 historical smelters in the Detroit metroplitan area
21	DWSmelter	Code identifying soil sample locations that were downwind (within 45∞ of predominate wind direction) of 1 or more of 19 historical smelters in the Detroit metropolitan area. 1 - soil was downwind of smelter, 0 - soil was not downwind of smelter.
22	DWSmelterSum	Total number of smelters that soil sample locations were downwind from (within 45∞ of predominate wind direction), maximum number of 19 smelters
23	CompZmax	The maximum compound z-score of the proximity soil have to the historical locations of smelters. First, a z-score is calculated for the inverse distance to each of the 19 historical locations of smelters in the Detroit metroplitan area. Second, a z-score is calculated for inverse angle that is produced by the location of the soil sample and the vector productred by the predominate wind direction fom the histrical location of smelters. Finally, these two values are multipled eachother for each of the 19 smelters locations to create a compound z-score. The higher compound z-score, the closer the soil sample is to being proximate and downwind the historical location of a smelter. This value is the maximum compound z-score of the 19 values.
24	CompZmean	The mean compound z-score of the proximity soil have to the historical locations of smelters. First, a z-score is calculated for the inverse distance to each of the 19 historical locations of smelters in the Detroit metroplitan area. Second, a z-score is calculated for inverse angle that is produced by the location of the soil sample and the vector productred by the predominate wind direction fom the histrical location of smelters. Finally, these two values are multipled eachother for each of the 19 smelters locations to create a compound z-score. The higher compound z-score, the closer the soil sample is to being proximate and downwind the historical location of a smelter. This value is the mean compound z-score of the 19 values.