Based on the information given in the sketch below,

$1-$ calculate the longitudinal Rate of Grade of Spring Garden St$.$ from $16$th St$.$ east to $15$th St$.,$ and

$2-$ calculate the proposed top of curb elevations to be set by the contractor at the PC$\text{'}$s and the full stations.

$3-$ calculate the proposed First Floor Elevation at the house line at station $4+00,$ if the cross grade of the sidewalk is $0\mathrm{.}025$