Waste and the pollution of ecosystems are direct consequences of the use of resources for the modern society development. Waste dumps are evident witnesses of former economic and industrial management without sustainable waste management planning. Particular attention in this article is paid to the research of two waste dumps in the capital city of Latvia – Riga, which are planned to be re-cultivated in the nearest future and one site, which is former toxic hazardous soil dump site, where the remediation of site is of priority need. Waste dumps, mentioned in the article below, were created without environmental planning and in many cases the location of waste dumps are very problematic for secondary use of dumped material, remediation and re-cultivation. The present study is giving a general overview of contamination level in two waste dumps in Riga, which were made in the period from 50-ties to 70-ties of the 20th century, also the case of hazardous soil dump site formed in a period of more than 100 years is described. Planned actions as well as direct remediational technologies to reduce the poisonous impact to the urban environment and the role of re- cultivation in the urban planning in general are proposed. The fate of contaminants, including heavy metals, macrocomponents, oil products, various chemicals and other chemical oxygen demand (COD) and biological oxygen demand (BOD) agents must be estimated in the process of re-cultivation. Special technologies can be applied such as: a) in-situ and ex-situ technologies – excavation with separation and concentration of valuable materials, stabilization/ solidification of some areas in site and out of site; b) in-situ technologies – soil as the infiltrate source flushing for groundwater contamination level diminishing, barriers/ treatment walls around the waste dump areas, chemical treatment and phytoremediation; c) ex-situ technologies – soil washing and bioremediation in some cases. Legislative aspects as well as the possible land remediation technologies for reduction of the waste dump generated contamination in Latvia are also discussed.