It is necessary to control the fresh input sources of these OCPs in the shallow groundwater and to carry out valid shallow groundwater remediation. Cancer risk from each pollutant in the shallow groundwater of TLR was in the order of aldrin N dieldrin N heptachlor epoxide N heptachlor N α- HCH N HCB N β-HCH N p, p′-DDE N γ-HCH N p, p′-DDT N p, p′-DDD,
the predominance of aldrin and dieldrin suggested that the two OCPs were the main cancer risk factor in the shallow groundwater of TLR.