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Addendum to Surface and Subsurface Contamination Report �ECF0 V U DD for 19730 N. Windwood Drive, Woodbridge, California JAN 0 6 2005 SAN COUNTY 3.0 SITE DESCRIPTION ENV RONMENQTAL HEALTH DEPT, • Site background and historical From reviewing the aerial photographs from 1993 the site was in agricultural production. According to the current owner(Norman)the site was purchased by her grandfather in 1910 and has been in agricultural production for over 90 years prior to development in the area. Residential development to the south and east of the site has been happening for the past several years. Most of the adjacent parcels to the north and west of the site are in the Williamson Act which is a property tax reduction program for agricultural preservation. The ASTM Standard only requires a ownership search back for 50 years. • Physical characteristics of the site The site consists of a proposed eleven(11)acre re-zoned portion of a 19.670 acre undeveloped agricultural parcel (APN: 015-020-61). The parcel has been in vineyard until after 1993. The land is level at an elevation of about 35 feet. The remaining portion will be separated as a parcel and used by the sewer district under the current lease. The location of the sewer district percolation ponds to the direct north of the proposed subdivision was accomplished to remove the potential for flooding of the ponds from the Mokelume River. The common practice of having such ponds along river edges in the past has posed problems for many small cities and sewer districts in the San Joaquin and Stanislaus Counties. The relocation to a higher level has reduced that potential. • Current site conditions including compliance with applicable regulations as they pertain to the presence or absence of: Asbestos-containing materials (ACM) Urea formaldehyde foam insulation Lead paint Radon gas Facility storage tanks (above or below ground) Transformers or other electrical equipment that uses dielectric fluid