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, ~ <br /> � AR- Xrcherda|e c�oy ham/ V to 2 percent s|oPes. 7kis very decp/ w | ! droineiy on ceur�y ieve| |ow <br /> ° fan terrac.xs. It formed in alluvium f(om mixed rock sources. A few areas aro dissected by intermittent <br /> x[ou9hs that have been filied hecaue' of�iuod-|evel /n8. Elevation is 40 to 130 feet. The uvora3o annual � <br /> precipitation is ab out 14 inches, the average annual air temperature is about 60 degrees F and the average <br /> frost-free ppriod is about 270 days, / <br /> ` <br /> Typ.ca/ |y/ the uppc�r 8 inches of the qurface layer i- dark grayish brown clay loam, The lower 16 inches is <br /> grayish brown or br�wo clay. The subsoil is brown clay about 11 inches thick. The substratum to u depth <br /> of 84 inches is bro'wn clay. In some ar.euo the surface layer is clay or silty clay loam. <br /> Inc/uded in this unit are small areas of Co8na. Cupxy uod Vi3no|o soils on similar Positions. Also <br /> ioc/ud�d are sma| | ��cas ,f Archerd�|r soi |5 wit' hardpan below 40 inches oo sim� |ur positios and <br /> Archerdu|e soi |E 'o*\3 percent s|oyeE on s| i3ht|y hiSber positions Included � " <br /> of the total acreage. <br /> ' �'o�� ma e up a�ou� 15 percent � <br /> Permeam | ity of thi:- Archerdu|e soi | is slow. Available water capac�ty is Ngh. Shrink-swell pvtontia| is <br /> 4i9h, Effective ro')!tin8 depth is 60 inches or more. Runoff is slow and the hazard of water erosion is <br /> y| i8ht. The water iotake family for irrigation is 0.5. The soil is subject to rare flooding which occurs <br /> during years of abnormally high precipitution. <br /> Most areas of this uit ure used for irrigated crop|and and orchards. A few areas are used for honasite <br /> deve|opmeot. <br /> , <br /> This uoit is xuitod to irrigated row/ field and orchard crops. The main limitation is slow pprmeabi ! ity. <br /> Because of the slow ` prm»abi � ity of thi� soil, the application of water should he regulated so that water <br /> ` <br /> doe root stand on t surface and damage the crops. Furrow, border, corrugation and sprinkler irriptiw^ <br /> 5y5tom5 are suited to this soi | . 8eturnin3 crop residue to the soil or regularly adding other or8aoic <br /> Matter improves fert1 / ity. reduces crusting and increases the water intake rate. <br /> � <br /> If this unit is use r homesite development, the m ' <br /> Alain limitations are high shrink-swe| | 'otentia! , low [ <br /> strength and slow pe abifity. 8pncra[ mana3ement considerations include rare f|^odin3. If buildings are <br /> coastructed on this tr-i | , properly desi3nin8 foundations and footings and diverting runof11 away from <br /> buiNin3s he/p to pr�vent structural dam-age because of shrinking and swp| ! inS. BuiNinSs and roads should <br /> be deo <br /> igned � offset the limited ability of the soi | in this unit to support a load. If the soil is used <br /> for septic tank ubso�ption fields, the | imitatioo of slow permeabiHty can he overcome by }ncreasm8 the <br /> S!ze of the ahsorpti6n fie Id. Roads and streets shou|d be located above the expected flood �eve|. <br /> , <br /> The map unit ic' in �--�pabi | ity units 11-2' (MLRA'17>/ irrigated and IVs-3 (MLRA-17), non}rri3ated. This mop <br /> unit is vegetative s--�'i | group A. <br /> SAN'JOAQUIN COUNTY SOIL;SURVEY PRELIMINARY DRAF T IP:- SLIPiB7 TO CHA!4G�: <br /> ' <br /> " <br /> H ' i <br /> ' <br />