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April 13, 2000 Job Number: LG00-114;)' ' Page 5- loam. loam. The next 9 inches is.a.claypan of brown clay. The,lower part to a depth of 60 inches is a . brown:and-lighf brow9 induratedhardpan: In,some areas'the surface Jaye"r is a fine sandy loam:or , sand loam. Permeability is very slow.and the shrink-swell otential is hi Runoff is onded in• -� Y tY rY P g p. small.pools, is very slow or porided in level areas, and is slow on the convex slopes. The hazard of water.erosion is'slight."3.. The following is an excerpt of the engineering properties for the following-soil. _ f Table of Selected Sod Properties of the Sanjioaquin-Urban.land Complex 3 Soil Name and' Deptb.(W) Unified Soil Salinity soil Septic tank. Map Symbol .1 Class cation m' In Reaction absorption 1 ��,-- pH fields _ San Joaquin 0712:Loam CL-N4L,ML _<2 5.6-6:5 " Severe: _ loam,0 to 2. 12-26: Sandy clay loam, -52 6.1-7.3 cemented pan, f percent slopes.. fine sandy,loam SC': = peres'slowly. 240 26-35'. Clay loam, clay CL <.2 6.1-.7.8' �+ 35-66: lnduratcd. -- -- ' Note:_ The table descriptions do,not necessarily reflect site-specific soil properties. ~ Examination of a water well drilling-log located at 12159 E. Brandt Road (enclosed in the permit.section located in the'appendix) indicates generally alternating layers,of sandy clay and sand,with occasional gravel layers to a total well depth of.280 feet. The sandy clay layers (if continuous)would act as confining layer restricting the vertical mixing of ground water located' within the more permeable layers composed of sand and gravel. This in not uncommon for _ sediments located'rn the Sacramento'San' Joaquin Valley especially near large river.drainages. Three soil:borings were drilled by Neil 0.�Anderson& Associates, Inc. to characterize the � subsurface and locate,,a surtable'site for the proposed septic field. Boring'B-1 was somewhat different in composition when compared.to borings B-'2 and B-3.. Boring B-1 was composed of a { sandy clay, clayey sand, sandy clay a.hd clay with sand to'a maximum depth of 15 feet (Plate 8):. A l zone between 10.5 and 11 was found to be moist. Na hardpan layer was,found to exist at B-1.'' �l` .. ," 1, . .. .' - - . • � 3 USDA Soil Conservation Service,Soil Survey of San Joaquin County, California, Sheet 7.