NEHRP Site Classes for Census Tracts in Manhattan,New York City: Figures

A	Largely bedrock outcrops with lowlands near Bakersfield stadium (1&2). Minimal hazards loss.
B	Inwood lowlands. 20-60 ft bedrock depth (3), which according to (5) could be either C or D class soils. This area has considerable amounts of fill and sediment, so it was designated as a softer class D type. (1). This area contains bedrock of South East sloping gradient, so it could have been considered as a transition C-soil. With a higher resolution depth to bedrock map overlayed on the census tract, instead of just bedrock contour data a different judgement could have been applied [1,2,3].
C	Major outcrops in this area. All pertinent facilities and population located predominately on bedrock. [1,2].
D	Located between 155 to 158 st, there is an indentation in the bedrock sloping towards the Hudson River [1,2,3]. There are B soil areas down to 145 st. - 148 st. Area is almost entirely made up of Manhattan Schist. Substantial bedrock info combined with MTA Boreholes and generalized by sources [1,2,3].
E	City College highlands. Predominately rocky soils with outcroppings [1,2]
F	Bronx portion of Manhattan. High lying hills with most facilities located in low lying areas. Previously East River channel, so mostly built on fill. This justifies a D class soil definition. [1&2].
G	Inwood lowlands. 20-60 ft bedrock depth [3], which according to [5] could be either C or D class soils. This area has considerable amounts of fill and sediment, so it was designated as a softer class D type. [11
H	Inwood lowlands. 20-60 ft bedrock depth [3], which according to [5] could be either C or D class soils. This area has considerable amounts of fill and sediment, so it was designated as a softer class D type [1]. This tract also contains a considerable amount of filled swamp land [2].
I	Inwood Marble and Elevating Manhattan Schist with flat lying bedrock plateau, 140-200 ft. [1,2].
J	Harlem Lowlands. Deep silty soils [1 2].
Figure 3a: Site classes for Manhattan by census tracts

All Figures