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Performa Inc. May 7,2003 Page 4 2.2 Existing Septic System and Truck Wash Station A site visit to observe the septic system at the site was performed on March 14, 2003,by David Welch and Abigail Racco of Anderson &Associates, Inc. Two concrete caps labeled"sanitary sewer"were observed at the northwest corner of the existing office building. No odor of septic waste was present in the vicinity. Review of the site plans provided by Performa Inc. confirmed the above observation. The area labeled"sewage disposal area"is depicted directly to the west of the office building in a rectangle whose northern boundary is the two observed sewer caps. The area immediately to the north is labeled"100% expansion sewage disposal area." In the septic permit discussed below, the locations of the sewage disposal area and expansion area are reversed from their depiction in the site plan. An oil separator and water reuse system exists north of the truck repair shop (Plate 2). The oil ' separator is used for the truck washing. We understand from EHD that the system is not disposed into the septic system. The waste products are hauled off site as needed. The wash water is recycled and reused for washing. The installation permit obtained from EHD indicates ' the system was installed by Specialty Paving Systems of Lodi in October 1995. No other details are known about this system at this time. See the EHD permit attached in the Appendix B of this report. 3.0 GEOLOGY AND SOILS OF THE SITE Atwater(1982)mapped the area as Pleistocene-age Modesto Formation consisting of loose sand ' and silt. The Modesto Formation is chiefly fluvial. The site is located on the distal portion of the alluvial fan formed by the Stanislaus River near the boundary of flood plain deposits of the San Joaquin River Delta(Atwater, 1992). The site is located within an area neighboring loose eolian ' sand dune deposits. Soils on the subject property have been classified by the U.S. Department of Agriculture, Soil Conservation Service Soil Survey of San Joaquin County, California (1992) as Honcut sandy loam and Tinnin loamy coarse sand. Soils in the area of the site are Honcut sandy loam and Tinnin loamy coarse sand. The Soil Survey describes Honcut sandy loam, 0 to 2 percent slopes, as"very deep,well drained, nearly level soil ... on alluvial fans... Typically, the surface layer is brown sandy loam about 21 inches thick. The underlying material to a depth of 60 inches is brown and yellowish brown sandy loam. In some areas the surface layer is fine sandy loam, coarse sandy loam, or gravelly sandy loam... Permeability is moderately rapid in the Honcut soil." O•®A