The Purpose Of The Contract Consists Of The Drafting Of The Structural And Detailed Management Of The General Planning Plan (Hereinafter Pgo) Of San Cristóbal De La Laguna With Adaptation To Current Regulations, Especially Law 4/2017, Of July 13, Of The Soil And Protected Natural Spaces Of The Canary Islands (Hereinafter Lsenpc), Law 21/2013, Dated December 9, Environmental Evaluation