(March 27, 2018, 11:23 AM EDT) -- PHILADELPHIA — Two companies that own land on a Superfund site outside of Philadelphia on March 23 agreed to pay $1.8 million to reinforce protective caps on two quarries that were contaminated with waste ammonia liquor to use part of the site for residential development, according to a filing in Pennsylvania federal court (United States of America v. Renaissance Land Associates II LP, et al., No. 18-cv-1205, E.D. Pa.)....