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Jahant Lake . Grading activities and the location of home- sites could further disrupt the natural area. Additional information regarding the suitability of using Jahant Slough for terminal drainage is needed. Protective ease- ments or buffers should be required to further protect the Labitat around Jahant Slough. 13 . a. The proposed project has the potential to degrade the quality of the environment by introducing homesites into the undisturbed area of Jahant Slough. The release of drainage water from the subdivision into Jahant Slough, and ultimately Jahant Lake , could contain pollutants from roads and driveways . The Department of Fish and Game has indicated that besides possessing valley oaks, the Jahant Slough area has significant wetland habitat . It is possible that the area may support two species on the endangered list , the Swainson' s hawk and the giant garter snake. More information concerning the effect of using Jahant Slough for terminal drainage needs to be obtained. Mitigation measures to protect the riparian habitat , which could include an open-space buffer zone, appear warranted. 13 . d. There are several identified environmental impacts which could cause substantial , adverse effects on human beings. Lodi Linds Airport is immediately south of the proposed subdivision. The crosswinds runway' s Inner Approach/Climb- out zone passes over the subdivision. This poses a large safety concern. In addition, the noise contour for the crosswinds runway is not known. The 65 db CNEL contour for the main runway extends into the subdivision. Noise from State Route 99 is also an issue, as the current and pro- jected 65 db CNEL contours encompass the eastern lots of the subdivision. An acoustical study is needed to assess the extent of the noise impact . The Lodi Linds Airport is used by cropdusters who have used improper procedures in the past . The Department of Health Services discovered soil contamination at the air- port in 1981 . It has been scheduled for cleanup as a hazardous waste site. A complete study should be prepared to assess the level of soil contamination and possible groundwater contamination by the chemicals identified by the Department of Health Services. The proposed subdivision would result in additional traf- fic volumes . Caltrans has indicated that the traffic will impact State Route 99 and the Route 99 interchange at Jahant Road. Caltrans suggests that a traffic analysis be prepared. NOTE: On May 28 , 1987 , (under File No. SU-86-10) , the Board of Supervisors directed that a Limited Environmental Impact Report be prepared which would focus only on the issues of ( 1 ) toxics, ( 2 ) airport flight patterns regarding noise levels, and (3) egress/ingress. Though this Initial Study Environmental Impacts - 4 - (Tract No . 1742 )