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23 September 2005 AGE-NC Project No. 05-1330 Page 3 of 18 The Modesto, Riverbank and Turlock Lake Formations and overlying Recent alluvium are the principal source of domestic ground water in the 13,500 square-mile San Joaquin Valley Ground Water Basin (Basin 5-22). This basin is drained primarily by the San Joaquin River. The nearest surface water feature was the Mormon Slough, approximately 3,000 feet to the south, and the Stockton Diverting Canal, approximately one mile to the northeast. The estimated depth to ground water at the subject property is approximately 50 to 60 feet below surface grade (bsg), based on the map titled Lines of Equal Depth to Groundwater, Spring 1999 published by the San Joaquin County Flood Control District and Water Conservation District (FCD&WCD).Itis inferred from the map titled Lines ofEqual Elevation of Groundwater, Fall 1999, also published by the FCD&WCD,that the local groundwater flow direction is unclear on the subject property. Ground water is considered to be of beneficial use and is utilized for domestic, industrial and commercial purposes. The prevailing ground water flow direction in Stockton generally ranges from northeast to east,but this may be greatly modified by local recharge and discharge patterns.Ground water monitoring data taken from the Morley Cooling Tower site approximately 3,000 feet to the north noted a ground water flow direction to the south, and monitoring data taken from Beacon 4474, 3440 East Main Street„ approximately 2,360 feet to the southwest noted a depth to ground water of approximately 60 feet bsg and a flow direction to the northeast to east. The EDR Report Overview and Detail Maps, provided on Pages 2 and 3 respectively, showed the subject property located in a 500-year Flood Zone. This data, available in select counties across the country,was obtained by EDR in 1999 from the Federal Emergency Management Agency(FEMA); the data depicts 100-year and 500-year flood zones as defined by FEMA. The EDR Report Overview and Detail Maps,provided on Pages 2 and 3 respectively, did not show ` the subject property listed in the National Wetlands Inventory. This data,available in select counties across the country, was obtained by EDR in 2002 from the U.S. Fish and Wildlife Service. 4.0. HISTORICAL USE The history of the subject site from as early as 1910 to present was researched by reviewing aerial photographs, topographic maps, San Joaquin County Assessor's Office records and a personal interview. Based on available information, subject property use appears to have been residential for at least at least 95 years. The Assessors Office notes that the property parcel formerly included two residences, one small house/cabin fronting on Adelbert Avenue(625 South Adelbert Avenue), was moved onto the property in approximately 1910 and demolished in 1993; one small house and ` shed/tool house fronting on Horner Avenue (4175 Horner Avenue), were constructed in Advanced GeoEnvironmental,Inc.