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v II. INTRODUCTION On April 1, 1988 the Sunboro De elopment Corporation, 1307 S, Mary Ave. #208, Sunnyvale, California was processing a subdivision map through the City of Tracy' s Planning and Public Works Departments. On that date, petroleum hydrocarbon contamination was discovered near the northeast corner of the Sunboro Development Company' s Tracy property. Several weeks later, additional petroleum hydrocarbon contamination was discovered approximately 800 feet northwest of the intersection of Corral Hollow and Byron - Roads in the City of Tracy, California. For the most part, the contamination plume is thought to lie under the Southern Pacific Railroad and Byron Road right-of-way. Previous work in the area indicated a minor plume intrusion onto the Sunboro Development property. Based upon this discovery, the Sunboro Development Subdivision project was put on hold by the City of Tracy staff until the extent of the petroleum hydrocarbon plume could be identified. The Sunboro Development Subdivision is made up of two separate, but adjacent parcels of land, both Iocated south of Byron Road and west of Corral Hollow Road as indicated below: A portion of the Southeast one-quarter of Section 19, Township 2 South, Range 5 East, Mount Diablo Base and Meridian, described r as follows: Parcel A As shown upon the map filed for record May 9, 1988 in Book 15 of Parcel Maps at page 151, San Joaquin County records, containing 22.5 acres more or less; Assessor's Parcel No. 237-170-45. (See r Map, Exhibit II-A, page iii ) Parcel B A portion of the southeast one-quiarter of Section 19, Township e , 2 South, Range 5 East, Mount Diabl& Base and Meridian, described as follows: As shown upon the map filed for record May 9, 1988 in Book 15 of Parcel Maps at page 151, San Joaquin County records, containing 22.6 acres more or less; Assessors Parcel No. 237-170-44. (See Map, Exhibit II-A, page iii ) The above two parcels, A and B, a e adjacent along an east-west line that separates these two parcels. As seen on the map, Parcel F B lies adjacent to and south of yron Road. The known slight intrusion of the petroleum h.ydroca�rbon plume is along the north boundary of Parcel B at Byron Road. It is thought that Parcel F A is free of petroleum hydriocarbon contamination. The contamination probably originates from the Southern Pacific Railroad right-of-way north of Byron Road. r TI-1