Twenty-eight years after swimming the English Channel at age 22, and twenty-four years after circumnavigating the water around Manhattan Island, Marty McMahon, a former president of the Windsor Chamber of Commerce in Connecticut, has his heart set on achieving the Triple Crown of Open Water Swimming by swimming the Catalina Channel in Southern California on July 17.¬†And, heart is truly what this swim is all about for McMahon. McMahon, who currently heads the WCC’s tourism committee, is taking on the athletic challenge to raise money and awareness for Autism Services and Resources Ct ASRC (www.ct-asrc.org); McMahon’s son Denis has Asperger ¬†syndrome, which is part of the autism spectrum. According to Open Water Source, the marathon swims in the Triple Crown of Open Water Swimming…