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Surface and Subsurface Contamination Repolt'APN: 251-050-03`Parcel Nos.'?-,&Designated Remainder Soils of the Ambrose series consist of a dark brown or dark grayish brown, strongly developed secondary material from sandstone, shales, and other sedimentary rocks. The soil occupies low terrace positions having smooth to gently undulating relief. The surface soil is noncalcareous but the subsoil contains appreciable quantities of lime. Two types clay loam and clay, are mapped in the county. The clay is frequently saline, and areas have been designated in which they are slight, medium, and strong concentrations of alkali salts. To a depth of about 21 inches, Ambrose Clay consists of a dark brown noncalcareous clay having a pH of 7.6 and a moisture equivalent of 21.87 percent. The surface is very hard when dry, and breaks into large blocks or clods. When moist the soil is readily workable. This horizon contains 24.31% sand, 28.19% silt, and 49.6 Ip clay. Over 54 % of the clay consists of particles less than I micron in diameter. In depths ranging from 15 to 30 inches, the upper subsoil grades into a dark brown, or brownish gray calcareous material,becoming lighter colored at the lower limits of this horizon. At depths ranging from 24 to 42 inches, the lower subsoil is permeated with streaks of darker colored material. These are apparently caused by darker colored surface soil falling into the cracks when the soil is dry. This horizon is a compact, dense layer having a prismatic structure with colloidal stains on the faces of the blocks, and containing considerable aggregated lime. The moisture equivalent is 33.29%. Below the compact clay layer is a substratum of yellowish brown, calcareous, stratified sediments having lighter texture. In this layer the pH is 7.7 and the lime content is 4%. Surface drainage and runoff are moderate but subsoil drainage is slow, being restricted by the density of the soil. Alkali salts occur in varying concentrations from slight to strong. The native vegetation is grass. Where irrigation is used,Ambrose soils produce alfalfa, and flax. Without irrigation, grain and grain hay are the primary crops. Alfalfa is not long lived, lasting only two to three years. Ambrose clay has a Storie rating of 55 %and the clay when free from alkali, a rating of 39%. The University of California publication entitled"Soils of San Joaquin County, California,United States Department of Agricultural Soil Conservation Service", issued October 1992, lists Capay Clay as the main soil classification that will be encountered on the subject property with a small quantity of Zacharious Clay Loam in the southwest portion. Sam and Marie Tnsn 77169 gnnth 1.ArnmPrG Rnad Tram Califnmia Q5176 !9091 R; - 9Q70 5