|
B. SURFACE AND SUBSURFACE SOIL CHARACTERISTICS
<br /> Information on the surface and subsurface soil characteristics of the soils under examination are
<br /> found in the USDA Natural Resources Conservation Service (MRCS) Soil Survey of San Joaquin
<br /> Co un . The soil survey map illustrating and delineating the referenced soil types is found in
<br /> Appendix 5. The following Table illustrates the soil types found on each of the three Ranches that
<br /> accept bovine nutrients from the de Snayer Dairy, along with Available Water Holding Capacity
<br /> and Field Capacity data. Soil physical characteristics of Permeability and Clay Content, as
<br /> described in the Soil Survey are also presented:
<br /> TABLE 2
<br /> MRCS SOIL SURVEY INFORMATION
<br /> HOME RANCH
<br /> �- Sailboat silt loam (#235). Found in the N '/s of this Ranch(57 Acres). Rate of irrigation water intake is 0.7 inch per
<br /> hour. Available Water Holding Capacity Average=0.17 in/in,Field Capacity Average=0.38 in/in.
<br /> Permeability is moderately slow. Clay Content= 15-27%(0-8"Depth), 18-35%(8-23"Depth).
<br /> Rioblancho clay loam(#226). Found in the remaining areas of this Ranch(118 Acres), including the areas of the
<br /> manure containment structures. Rate of irrigation water intake is 0.5 inch per hour.
<br /> Available Water Holding Capacity Average=0.17 in/in,Field Capacity Average=0.19 in/in.
<br /> Permeability is moderately slow. Clay Content=27-30%(0-16"),20-35%(16-28").
<br /> ACAMPO RANCH
<br /> Tujunga loamy sand(#259)Found in the SWC of this Ranch (70 Acres). Rate of irrigation water intake is 3.0 inches
<br /> per hour. Available Water Holding Capacity Average=0.08 in/in,Field Capacity Average=0.38 in/in.
<br /> Permeability is rapid.Clay Content=0-5%(0-22"),0-5%(22-67").
<br /> Tokay fine sandy loam(#256). Found on the remaining portion of this Ranch(90 Acres),including the areas of the
<br /> manure containment structures. Rate of irrigation water intake is 1.5 inches per hour.
<br /> Available Water Holding Capacity Average=0.14 in/in, Field Capacity Average=0.38 in/in.
<br /> ._ Permeability is moderately rapid. Clay Content= 10-15%(0-19"), 10-18%(19-45").
<br /> BLOSSOM RANCH
<br /> Devries sandy loam(#149)Found in the NEC and SWC of this Ranch(231 Acres). Rate of irrigation water intake is
<br /> 1.5 inches per hour. Available Water Holding Capacity Average=0.12 in/in,Field Capacity Average=0.28 in/in.
<br /> Permeability is moderately rapid. Clay Content=7-18%(0-13"),7-18%(13-28").
<br /> Guard clay loam(#169)Found in the middle portion of this Ranch(190 Acres). Rate of irrigation water intake is 0.5
<br /> inch per hour. Available Water Holding Capacity Average=0.15 in/in, Field Capacity Average=0.20 in/in.
<br /> Permeability is slow. Clay Content=27-35%(0-15"),20-35%(15-72").
<br /> r
<br /> From the soil data presented above, we find the following: The Home Ranch appears to have
<br /> comparatively equal soils between the two soil types found on this Ranch, which aids in the
<br /> uniform distribution of applied irrigation water. Since the rate of irrigation water intake, or
<br /> infiltration rate is relatively slow due to a comparatively high clay content, runoff would be
<br /> expected to be quicker than in soils with faster infiltration rates, and the ponding potential higher.
<br /> In accordance with Title 3, Division 2, Section 646.1, ponding within manured areas or with
<br /> manured water shall be prevented. Consequently, blended irrigation water is, and will continue to
<br /> be, managed carefully through direct observation during irrigations.
<br /> s
<br /> -3-
<br /> .. The Acampo Ranch is a loam type soil with infiltration rates that are variable for the two types of
<br /> soil on the ranch. Runoff should be slower with these soil types because the rate of water intake is
<br /> faster. Clay content is low in the southwest corner of the irrigated cropland, but exceeds 10%
<br /> over the remaining portion of the ranch, which includes the areas of the containment structures
<br /> and water conveyance ditches.
<br /> The on-site soil types for the Blossom Ranch are referenced as a sandy and clay loam. Therefore, a
<br /> faster rate of irrigation water intake will occur for the sandy loam, and a slower rate of water intake
<br /> will occur for the clay loam. As referenced, Mr. de Snayer will not be farming or managing
<br /> irrigation at the Blossom Ranch. As described in the Manure Management Plan (Section V),
<br /> manure solids from the Home Ranch will be incorporated into row crop fields as quickly as possible
<br /> to obtain maximum nutritional benefit, prevent manure solids runoff and reduce odors.
<br /> Based on the field capacity for the three Ranches, the following calculations determine the volume
<br /> of water each soil type can hold throughout the rooting depth of 60 inches, for the respective soil
<br /> type. The field capacity is the amount of water remaining within the soil pores after the influence
<br /> of gravity has drained from the larger pore spaces, and is retained within the smaller spaces. The
<br /> soil reservoir is full, but no longer saturated. Consequently, a safety factor is incorporated by
<br /> using the field capacity and not total soil porosity, which would be complete soil saturation.
<br /> Home Ranch Sailboat soil=0.38 in/in x 60 in. =23 in. x 27,154 gals/ac-in.x 57 ac. =3.53 x 10'gals.
<br /> Home Ranch Rioblancho soil=0.19 in/in x 60 in.= 11 in. x 27,154 gals/ac-in. x 118 ac.=3.65 x 10'gals.
<br /> Acampo Ranch Tujunga soil =0.38 in/in x 60 in. =23 in. x 27,154 gals/ac-in. x 70 ac. =4.37 x 10'gals.
<br /> -- Acampo Ranch Tokay soil=0.38 in/in x 60 in. =23 in. x 27,154 gals/ac-in. x 90 ac. =5.62 x 10'gals.
<br /> Blossom Ranch Devries soil=0.28 in/in x 60 in. =23 in. x 27,154 gals/ac-in. x 231 ac. = 1.066 x 108 gals.
<br /> Blossom Ranch Guard soil =0.20 in/in x 60 in. = 12 in. x 27,154 gals/ac-in. x 190 ac. =6.19 x 10'gals.
<br /> .� C. GROUNDWATER INFORMATION
<br /> Groundwater under the de Snayer Dairy is located in the San Joaquin Valley Groundwater Basin,
<br /> between the Tracy Subbasin (Number 5-22.15) and the Cosumnes Subbasin(Number 5-22.16).
<br /> These subbasins consist of unconsolidated and semiconsolidated sedimentary deposits, with
<br /> aquifer systems consisting of continental deposits of Late Tertiary and Quaternary Age. Deposits
<br /> '- include Younger Alluvium, Old Alluvium and Miocene/Pliocene Volcanics. Thickness of these
<br /> deposits ranges from a couple hundred feet near the Sierra Nevada foothills to more than 2,500
<br /> feet along the western margin of the subbasin, where the dairy is located.
<br /> Groundwater quality for these subbasins is generally characterized by calcium-magnesium and
<br /> calcium-sodium bicarbonate water types. Groundwater from wells in the San Joaquin portion of
<br /> the subbasin typically test for Ec values of less than 500µmhos/cm. Water quality data from
<br /> DWR indicates that in 20 public supply wells tested in the Cosumnes Subbasin, no wells had a
<br /> nitrate concentration over the MCL.
<br /> -4-
<br /> ,. Chesney Consulting
<br />
|