at ▁of ▁an ▁ancient , ▁ext inct ▁vol cano ▁which ▁was ▁active ▁at ▁the ▁end ▁of ▁the ▁Ta con ic ▁O ro gen y ▁approximately ▁ 4 2 0 ▁million ▁years ▁ago . ▁This ▁n ond es cript ▁hill ▁in ▁the ▁Be emer ville ▁section ▁of ▁W antage ▁Township , ▁is ▁the ▁surface ▁expression ▁of ▁a ▁ ▁l am pro phy ric ▁di atre me ▁that ▁is ▁the ▁northern ▁part ▁of ▁the ▁Late ▁Ord ov ician ▁Be emer ville ▁Al kal ine ▁Complex ▁that ▁also ▁includes ▁two ▁large ▁ne ph eline ▁sy en ite ▁plut ons ; ▁and ▁several ▁other ▁nearby ▁and ▁much ▁smaller ▁d ikes , ▁s ills , ▁and ▁di at rem es . ▁ ▁H ydro log y ▁and ▁poll ution ▁ ▁In ▁ 2 0 0 4 , ▁the ▁New ▁Jersey ▁Department ▁of ▁Environment al ▁Prote ction ▁designated ▁a ▁ ▁segment ▁of ▁Pap ak ating ▁Creek ▁in ▁the ▁vic inity ▁of ▁Sus sex ▁Bor ough ▁and ▁Clo ve ▁Creek ▁( including ▁Clo ve ▁Ac res ▁Lake ) ▁to ▁be ▁imp a ired ▁by ▁ph osph orus ▁loading . ▁N J DE P ▁estimates ▁a ▁ph osph orus ▁concentration ▁of ▁ 0 . 0 7 9 1   m g / L ▁and ▁a ▁dis charge ▁of ▁ ▁of ▁ph osph orus ▁each ▁year . ▁The ▁source ▁of ▁most ▁of ▁its ▁presence ▁is ▁derived ▁from ▁the ▁run off ▁of ▁fert il izer ▁applications ▁on ▁resident ial ▁la wn s ▁and ▁agricult ural ▁operations . ▁N J DE P ▁ident ifies