▁gas ▁well s ▁were ▁c apped , ▁and ▁the ▁land ▁that ▁had ▁been ▁stri pped ▁was ▁covered ▁again ▁with ▁back ▁fill , ▁and ▁grad ed ▁to ▁res emble ▁its ▁former ▁condition . ▁The ▁soil ▁was ▁spe cially ▁treated ▁with ▁fert il izer ▁to ▁allow ▁for ▁the ▁growth ▁of ▁thousands ▁of ▁trees , ▁shr ubs ▁and ▁grass es . ▁Lake ▁Arthur ▁was ▁completed ▁in ▁ 1 9 7 0 ▁with ▁the ▁opening ▁of ▁M ora ine ▁State ▁Park ▁on ▁May ▁ 2 3 , ▁ 1 9 7 0 . ▁ ▁Leg acy ▁Frank ▁W . ▁Pr eston ▁continued ▁to ▁work ▁in ▁e col ogy ▁and ▁conservation ▁in ▁his ▁adopted ▁home ▁state ▁of ▁Pennsylvania . ▁He ▁worked ▁hand ▁in ▁hand ▁with ▁Maurice ▁K . ▁God d ard ▁and ▁Otto ▁Em ery ▁Jenn ings ▁in ▁creating ▁state ▁par ks ▁in ▁Western ▁Pennsylvania ▁including , ▁Mc Con n ells ▁Mill ▁State ▁Park , ▁Maurice ▁K . ▁God d ard ▁State ▁Park ▁and ▁the ▁Jenn ings ▁Environment al ▁Education ▁Center ▁which ▁borders ▁M ora ine ▁State ▁Park ▁to ▁the ▁north . ▁Frank ▁W . ▁Pr eston ▁died ▁on ▁March ▁ 1 , ▁ 1 9 8 9 ▁in ▁Butler , ▁Pennsylvania . ▁His ▁Mer id ian ▁property ▁has ▁since ▁become ▁a ▁park ▁owned ▁and ▁maintained ▁by ▁Butler ▁Township ▁following ▁the ▁death ▁of ▁his ▁wife , ▁Jane , ▁in ▁ 2 0 0 8 . ▁The ▁property ▁was ▁w illed ▁to ▁the ▁town ship ▁on ▁the ▁grounds ▁that ▁it ▁never ▁be ▁tim ber ed , ▁m ined ,