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kn KLEINFELDER i PRESENT AND PAST USE OFTHE SITE Kleinfelder has .performed a Limited Phase.I Environmental Site Assessment (ESA) for the Cherry Glen Subdivision property (File No. 43-4476-01.201). The purpose of the assessment was to assist the client in recognizing environmental conditions at the site. Through literature interviews, the assessment concluded that in the early review, aerial photograph review and 1900's the site was used for ranching and a structure with cattle pins was constructed near the norteast corner of the site. Also, railroad tracks crossed the southeast corner of the site and h continued along the east boundary. Between 1937 and 1952, a pear orchard was planted in the western portion of the site. By 1963 the orchard had been removed and the site has been used for ranching till the present time. By 1975 the structure had been removed and in the early 1990's the railroad tracks were removed. According to a previous landowner, a septic system has never been located on-site. During our site reconnaissance, a concrete pad with steel well casing was he site approximately noted in the northeast portion oft pp Y 220 feet west of Fine Road and 50 feet south of the property boundary. HISTORICAL GROUNDWATER DEPTH In accordance with groundwater reports published by the San Joaquin County Flood Control and Water Conservation District (Spring 1990 to Spring 1998), high groundwater in the project area 1 has been recorded at depths in the range of about 120 below ground surface. At the time of our study, the depth to water in the well located near the northeast corner of the site was measure at about 131 feet. F FIELD EXPLORATIONS AND TESTING The subsurface conditions at the site were initially explored as part of a geotechnical investigation on July 28, 1999 by drilling three borings (B-1 through B-3) to depths ranging from about 15.5 to 16.5 feet below existing grade. The borings were drilled using a Simco 2400 truck- mounted drill rig equipped with 4-inch O.D. solid-stem auger. During the same time period, a percolation boring was drilled in the back-central portion of each of the 14 lots (P-1 through P- 14) at depths ranging from about 5 to 20 feet below site grade. Once the percolation tests were performed, Boring B-2 was converted to a percolation tests because of failing test results at Percolation P-9. On August 23, 2,000 one boring was drilled at both Lots 2 and 10 (P-15 and P- 16) for additional percolation testing because of previous failing tests. At the request of the San Joaquin County Department of Public Health Services (SJCPHS) Department, twelve additional percolation tests were performed on Lots 1, 3, 4, 5, 9 and 14 since the original percolation tests performed on these lots were not witnessed by a representative from i SJCDEH. In addition, four tests were requested in Lots 10 and 12 since the original percolation tests were not located in or near the area of the final proposed septic field. On October 4, 2001, eight of the 16 tests (one on each referenced lot) were installed at depths of about 3 feet below site grade in soils that are relatively dense and know to not exhibit adequate percolation 20-4476-01.G02/201 1 R 1242 Page 2 of 6 + © October 11,2001 2001 Kleinfelder,Inc. i ..