Half of a $3.2 million fine levied against San Diego for city construction inspectors’ past failure to require efforts to keep construction sediment out of storm drains will go to restoration efforts at Los Peñasquitos, Chollas Creek and San Diego River, according to settlement documents. The water board investigation arose out of a private citizen’s report in May 2015 that a city inspector was allowing a city contractor to let mud run down Trumbull Street in Point Loma — with the mud ending up in a storm drain. The contractor was replacing concrete pavement on the hill above Shelter Island.