**Number range CHAPTERCALIFORNIA ROW CROP**

This scenario is intended to represent general row crop production in
the Central California Coast/Coastal Valleys Range, primarily MLRAs 14 &
15, and parts of MLRA 20, hereafter referred to as area of interest
(AOI). Row crops include crops such as artichokes, carrots, beans,
asparagus, celery, peppers, and spinach. Based on 2002 USDA Census of
Agriculture data, approximately 230,480 acres of these crops was grown
in California (USDA, 2002). Within the AOI, approximately 46% of the row
crop acreage occurs in the counties of Monterey, Kern, Ventura, Santa
Barbara, and San Luis Obispo. Monterey and Kern are the top producing
counties in the state representing 35% of the total acreage (USDA,
2002).

[]{.mark}

Carrots are the most common row crop in the AOI, representing roughly
30% of the total acreage. Carrots are always direct seeded in a narrow
groove, and sown in 6 or 8 lines in beds 38 to 42 inches wide on residue
conditions (USDA 1999); Monterey County cooperative extension agent).
Carrots are irrigated by sprinklers during the entire season at a
maximum application rate of 0.63 cm/hr. (USDA 200a). Carrot plants have
a maximum root depth of 18 inches and prefer deep, well drained sandy
loams soils with a pH range of 5.5 and 7.0 (USDA 200a; Monterey County
cooperative extension agent). In the coastal regions, the carrots are
planted from December to August for harvest in April to January
(Monterey County Cooperative Extension Agent). Carrots are mechanically
harvested with self-propelled, multi-row harvesters.

Metfile W23234 (Santa Maria) is the meteorological data set used to
representative Central California Coast/Coastal Valleys Range Row crop
production. The station is located along the coast in Santa Barbara
County within MLRA 15. It is roughly 106 miles to the south of Monterey
County which contains the field used to represent this scenario. The
Fresno station is approximately 20 miles closer to the geographic center
of Monterey County, however the Santa Maria station was deemed more
representative for several reasons. First, this scenario is generally a
coastal scenario. Fresno is an inland station whereas the coastal Santa
Maria station is more representative of the Coastal Climate of this
scenario. In addition, the Santa Maria station receives approximately
three inches more annual rainfall than the Fresno station, increasing
the conservative nature of the scenario (NOAA, 2006).

[]{.mark}

The Mocho series is the most common row crop soil found in Central
California Coast/Coastal Valleys Range accounting for 13% of row crop
acreage acreage (USDA, 2002; Table 5). It is a fine-loamy, mixed,
superactive, thermic Fluventic Haploxerolls soil found on slopes of 0 to
9% (USDA, 2001), which includes the maximum slope on which row crops are
grown (R. Smith, Personal Communication). The soils are mostly irrigated
and intensively used for forage, field and truck crops, some fruit and
dry areas are sued for grain and range (USDA, 2001). Location and
metfile selections are often the most important developments affecting
scenario vulnerability and protectiveness. Metfile selection has been
discussed above. Soil selection is also an important protectiveness
factor. Based on USDA data, the majority (54%) of row crop bearing soils
in the region are hydrologic group B soils. Discussions with a local
expert indicates that row crops in the region are in limited to
hydrological soil group A and B soils, with the Mocho series being
representative of row crops in the region. The Mocho series was selected
for this scenario because it is both highly representative of row crop
bearing soils (R. Richards, personal communication) (Table 5), it
represents the 90^th^ percentile of vulnerability in erodibility, and it
includes the maximum slope on which row crops are grown (R. Richards,
personal communication) (Table 5). This scenario has been parameterized
based on Mocho silt loams, 0-2 % slopes.

[]{.mark}

Mocho is a Hydrologic Group B soil, which does not include the 90^th^
percentile of these soils in drainage based on soil survey data (USDA,
2006), however as noted above, local expert information indicated that
row crops are limited to groups A and B. Because exposure scenarios are
intended to represent the "high end" of what might occur in an actual
agricultural setting, local expert knowledge and soil survey data led to
the selection of Mocho soils. Mocho soils have a USLE K factor of 0.49,
which is common to 10% of row crop bearing soils and includes the 90^th^
percentile of these soils in erodibility. Approximately 77% of row crop
bearing soils have a pH lower than Mocho soils (7.9-8.2). However, soil
pH is not currently a PRZM input parameter and is not expected to often
affect chemical fate in the acidic range. Based on the official soil
series description (USDA, 2001), Mocho soils have an A horizon from 0 to
18 inches (0-46 cm) deep and a C horizon from 18 to 72 inches (46-183
cm) deep (USDA, 2001).

[]{.mark}

[]{.mark}

+-----------------+----------+-----------------------------------------+
| **Table 1. PRZM |          |                                         |
| 3.12 Climate    |          |                                         |
| and Time        |          |                                         |
| Parameters for  |          |                                         |
| Monterey,       |          |                                         |
| California --   |          |                                         |
| Row Crop.**     |          |                                         |
+-----------------+----------+-----------------------------------------+
| **Parameter**   | *        | **Source/Comments**                     |
|                 | *Value** |                                         |
+-----------------+----------+-----------------------------------------+
| Starting Date   | Jan. 1,  | Meteorological File from Monterey       |
|                 | 1961     | County, California (Santa Maria)        |
|                 |          | (W23234) NOAA, 2006                     |
+-----------------+----------+-----------------------------------------+
| Ending Date     | Dec. 31, | Meteorological File from Monterey       |
|                 | 1991     | County, California (Santa Maria)        |
|                 |          | (W23234) NOAA, 2006                     |
+-----------------+----------+-----------------------------------------+
| Pan Evaporation | 0.75     | PRZM Manual Figure 5.1. Value           |
| Factor (PFAC)   |          | represents the central coast region.    |
+-----------------+----------+-----------------------------------------+
| Snowmelt Factor | 0        | The Weather Channel Interactive, Inc.   |
| (SFAC)          |          | (TWCII, 2006)                           |
+-----------------+----------+-----------------------------------------+
| Minimum Depth   | 17.5 cm  | PRZM Manual (EPA 1998)                  |
| of              |          |                                         |
|                 |          |                                         |
| Evaporation     |          |                                         |
| (ANETD)         |          |                                         |
+-----------------+----------+-----------------------------------------+

[]{.mark}

+-----------------+----------+-----------------------------------------+
| **Table 2. PRZM |          |                                         |
| 3.12 Erosion    |          |                                         |
| and Landscape   |          |                                         |
| Parameters for  |          |                                         |
| Monterey,       |          |                                         |
| California --   |          |                                         |
| Row Crop.**     |          |                                         |
+=================+==========+=========================================+
| **Parameter**   | *        | **Source/Comments**                     |
|                 | *Value** |                                         |
+-----------------+----------+-----------------------------------------+
| Method to       | 4 (MUSS) | PRZM Manual (EPA, 1998)                 |
| Calculate       |          |                                         |
| Erosion         |          |                                         |
| (ERFLAG)        |          |                                         |
+-----------------+----------+-----------------------------------------+
| USLE K Factor   | 0.49     | USDA NRCS Soil Data Mart                |
| (USLEK)         | tons     | (http://soildatamart.nrcs.usda.gov/)    |
|                 | EI^-1\*^ |                                         |
|                 |          | Value listed for the soil series Mocho. |
+-----------------+----------+-----------------------------------------+
| USLE LS Factor  | 0.2      | LS value for 1% slope and 400' slope    |
| (USLELS)        |          | length                                  |
|                 |          |                                         |
|                 |          | PRZM Manual (EPA, 1998)                 |
+-----------------+----------+-----------------------------------------+
| USLE P Factor   | 0.6      | Set to default 0.6 for row crops on     |
| (USLEP)         |          | 0-2% slopes with no contour plowing.    |
|                 |          | Contour plowing is not common (R.       |
|                 |          | Smith, Vegetable Crop and Weed Science  |
|                 |          | Farm Advisor, University of California  |
|                 |          | Cooperative Extension; Monterey, Santa  |
|                 |          | Cruz and San Benito Counties)           |
+-----------------+----------+-----------------------------------------+
| Field Area      | 172 ha   | Area of Shipman Reservoir watershed     |
| (AFIELD)        |          | (EPA, 1999)                             |
+-----------------+----------+-----------------------------------------+
| NRCS Hyetograph | 1        | PRZM Manual Figure 5.12 (EPA, 1998)     |
| (IREG)          |          |                                         |
|                 |          | Type I, IREG=1                          |
+-----------------+----------+-----------------------------------------+
| Slope (SLP)     | 1%       | Slopes range from 0 to 2%. Set to the   |
|                 |          | midpoint of the reported range. Richard |
|                 |          | Smith, Vegetable Crop and Weed Science  |
|                 |          | Farm Advisor, University of California  |
|                 |          | Cooperative Extension; Monterey, Santa  |
|                 |          | Cruz and San Benito Counties            |
+-----------------+----------+-----------------------------------------+
| Hydraulic       | 600 m    | Shipman Reservoir (EPA, 1999)           |
| Length (HL)     |          |                                         |
+-----------------+----------+-----------------------------------------+
| Irrigation Flag | 2        | Fields are sprinkler-irrigated during   |
| (IRFLAG)        |          | the entire growing season. (USDA, 200a) |
+-----------------+----------+-----------------------------------------+
| Number range    | 3        | Fields are sprinkler-irrigated during   |
| CH              | (sp      | the entire growing season. (USDA, 200a) |
| APTERIrrigation | rinkler) |                                         |
| Type (IRTYP)    |          |                                         |
+-----------------+----------+-----------------------------------------+
| Leaching Factor | 0.1      | Irrigation Guidance for developing PRZM |
| (FLEACH)        |          | Scenario, Table 3; (June 15, 2005).     |
+-----------------+----------+-----------------------------------------+
| Fraction of     | 0.5      | Set to default as per Irrigation        |
| Water Capacity  |          | Guidance for developing PRZM Scenario,  |
| when Irrigation |          | Table 3; (EPA 2005).                    |
| is Applied      |          |                                         |
| (PCDEPL)        |          |                                         |
+-----------------+----------+-----------------------------------------+
| Maximum Rate at | 0.1 cm   | Set to default as per Irrigation        |
| which           | hr^-1^   | Guidance for developing PRZM Scenario,  |
| Irrigation is   |          | Table 3; (EPA 2005).                    |
| Applied         |          |                                         |
| (RATEAP)        |          |                                         |
+-----------------+----------+-----------------------------------------+
| \* EI = 100     |          |                                         |
| ft-tons \* in/  |          |                                         |
| acre\*hr        |          |                                         |
+-----------------+----------+-----------------------------------------+
| []{.mark}       |          |                                         |
+-----------------+----------+-----------------------------------------+

[]{.mark}

+-----------------+----------+-----------------------------------------+
| **Table 3. PRZM |          |                                         |
| 3.12 Crop       |          |                                         |
| Parameters for  |          |                                         |
| Monterey,       |          |                                         |
| California --   |          |                                         |
| Row Crop.**     |          |                                         |
+=================+==========+=========================================+
| **Parameter**   | *        | **Source/Comments**                     |
|                 | *Value** |                                         |
+-----------------+----------+-----------------------------------------+
| Initial Crop    | 1        | Set to one for all crops (EPA, 2004).   |
| (INICRP)        |          |                                         |
+-----------------+----------+-----------------------------------------+
| Initial Surface | 3        | 3 = residue. Plant residue is left on   |
| Condition       |          | the ground from previous crop. Richard  |
|                 |          | Smith, Vegetable Crop and Weed Science  |
| (ISCOND)        |          | Farm Advisor, University of California  |
|                 |          | Cooperative Extension                   |
|                 |          |                                         |
|                 |          | Monterey, Santa Cruz and San Benito     |
|                 |          | Counties                                |
+-----------------+----------+-----------------------------------------+
| Number of       | 1        | Set to number of crops in simulation.   |
| Different Crops |          |                                         |
| (NDC)           |          |                                         |
+-----------------+----------+-----------------------------------------+
| Number of       | 30       | Set to weather data in meteorological   |
| Cropping        |          | file: Fresno, CA (W93193).              |
| Periods (NCPDS) |          |                                         |
+-----------------+----------+-----------------------------------------+
| Maximum         | 0.25     | PRZM manual Table 5-4 (EPA, 1998).      |
| rainfall        |          | Recommended value for soybeans (EPA,    |
| interception    |          | 2004).                                  |
| storage of crop |          |                                         |
| (CINTCP)        |          |                                         |
+-----------------+----------+-----------------------------------------+
| Maximum Active  | 46 cm    | Maximum rooting depth is 18 inches (46  |
| Root Depth      |          | cm). Richard Smith, Vegetable Crop and  |
| (AMXDR)         |          | Weed Science Farm Advisor, University   |
|                 |          | of California Cooperative Extension;    |
|                 |          | Monterey, Santa Cruz and San Benito     |
|                 |          | Counties                                |
+-----------------+----------+-----------------------------------------+
| Maximum Canopy  | 100      | Richard Smith, Vegetable Crop and Weed  |
| Coverage        |          | Science Farm Advisor, University of     |
| (COVMAX)        |          | California Cooperative Extension;       |
|                 |          | Monterey, Santa Cruz and San Benito     |
|                 |          | Counties                                |
+-----------------+----------+-----------------------------------------+
| Soil Surface    | 3        | 3 = residue. Plant residue is left on   |
| Condition After |          | the ground from previous crop. Richard  |
| Harvest (ICNAH) |          | Smith, Vegetable Crop and Weed Science  |
|                 |          | Farm Advisor, University of California  |
|                 |          | Cooperative Extension; Monterey, Santa  |
|                 |          | Cruz and San Benito Counties            |
+-----------------+----------+-----------------------------------------+
| Date of Crop    | 01/01    | Emergence occurs from December thru     |
| Emergence       |          | July. Set to the first crop of the      |
|                 |          | year. (R. Smith, Vegetable Crop and     |
| (EMD, EMM,      |          | Weed Science Farm Advisor)              |
| IYREM)          |          |                                         |
+-----------------+----------+-----------------------------------------+
| Date of Crop    | 01/04    | Crops are harvested at maturity. Set to |
| Maturity        |          | one week prior to harvest. (R. Smith,   |
|                 |          | Vegetable Crop and Weed Science Farm    |
| (MAD, MAM,      |          | Advisor)                                |
| IYRMAT)         |          |                                         |
+-----------------+----------+-----------------------------------------+
| Date of Crop    | 08/04    | Harvest occurs from April thru          |
| Harvest (HAD,   |          | December. Set to the first crop. (R.    |
| HAM, IYRHAR)    |          | Smith, Vegetable Crop and Weed Science  |
|                 |          | Farm Advisor)                           |
+-----------------+----------+-----------------------------------------+
| Maximum Dry     | 0.0      | Not used in scenario                    |
| Weight (WFMAX)  |          |                                         |
+-----------------+----------+-----------------------------------------+
| Maximum         | 38       | Maximum crop height is 15 inches (38).  |
| CropHeight      |          | Richard Smith, Vegetable Crop and Weed  |
| (HTMAX)         |          | Science Farm Advisor, University of     |
|                 |          | California Cooperative Extension;       |
|                 |          | Monterey, Santa Cruz and San Benito     |
|                 |          | Counties                                |
+-----------------+----------+-----------------------------------------+
| SCS Curve       | 86, 78,  | Gleams Manual Table H-4 (USDA, 1990);   |
| Number (CN)     | 82       | fallow = SR/hydrologic group C;         |
|                 |          | cropping and residue = SR+CT, poor      |
|                 |          | condition. CT is used to grow row       |
|                 |          | crops.                                  |
+-----------------+----------+-----------------------------------------+
| Manning's N     | 0.011    | RUSLE Project; C24BGBGC for California  |
| Value (MNGN)    |          | Green Beans with conventional till      |
|                 |          | (USDA, 200b). Data are from San         |
|                 |          | Francisco, which is the closest RUSLE   |
|                 |          | file with similar crop practices and    |
|                 |          | coastal CA climate.                     |
+-----------------+----------+-----------------------------------------+
| USLE C Factor   | 0.083 -  | RUSLE Project; C24BGBGC for California  |
| (USLEC)         | 0.795    | Green Beans with conventional till      |
|                 |          | (USDA, 200b). Data are from San         |
|                 |          | Francisco, which is the closest RUSLE   |
|                 |          | file with similar crop practices and    |
|                 |          | coastal CA climate.                     |
+-----------------+----------+-----------------------------------------+

[]{.mark}

[]{.mark}

+---------------+-------------------+---------------------------------+
| **Table 4.    |                   |                                 |
| PRZM 3.12     |                   |                                 |
| Mocho Silt    |                   |                                 |
| Loam, 0 To 2  |                   |                                 |
| Percent       |                   |                                 |
| Slopes Soil   |                   |                                 |
| Parameters    |                   |                                 |
| for Monterey, |                   |                                 |
| California -- |                   |                                 |
| Row Crop.**   |                   |                                 |
+---------------+-------------------+---------------------------------+
| **Parameter** | **Value**         | **Source/Comments**             |
+---------------+-------------------+---------------------------------+
| Total Soil    | 173 cm            | NRCS Soil Data Mart (SDM)       |
| Depth (CORED) |                   | (htt                            |
|               |                   | p://soildatamart.nrcs.usda.gov) |
+---------------+-------------------+---------------------------------+
| Number of     | 2                 | NRCS Soil Data Mart (SDM)       |
| Horizons      |                   | ([http://soi                    |
| (NHORIZ)      |                   | ldatamart.nrcs.usda.gov](http:/ |
|               |                   | /soildatamart.nrcs.usda.gov/)). |
|               |                   | Horizon A spans scenario        |
|               |                   | horizons 1 and 2 in order to    |
|               |                   | conform to PRZM input           |
|               |                   | requirements.                   |
+---------------+-------------------+---------------------------------+
| Horizon       | 10 cm (HORIZN =   | NRCS Soil Data Mart (SDM)       |
| Thickness     | 1)                | (htt                            |
| (THKNS)       |                   | p://soildatamart.nrcs.usda.gov) |
|               | 163 cm (HORIZN =  |                                 |
|               | 2)                |                                 |
+---------------+-------------------+---------------------------------+
| Bulk Density  | 1.35 g/cm^3^      | NRCS Soil Data Mart (SDM)       |
| (BD)          | (HORIZN = 1)      | ([http://soi                    |
|               |                   | ldatamart.nrcs.usda.gov](http:/ |
|               | 1.35 g/cm^3^      | /soildatamart.nrcs.usda.gov/)); |
|               | (HORIZN = 2)      | values are mean 1/3-bar moist   |
|               |                   | bulk densities of a soil        |
|               |                   | sampled as a Mocho soil.        |
+---------------+-------------------+---------------------------------+
| Initial Water | 0.283 cm^3^/cm^3^ | NRCS Soil Data Mart (SDM)       |
| Content       | (HORIZN =1)       | ([http://soi                    |
| (THETO)       |                   | ldatamart.nrcs.usda.gov](http:/ |
|               | 0.283 cm^3^/cm^3^ | /soildatamart.nrcs.usda.gov/)); |
|               | (HORIZN =2)       | values are mean 1/3-bar water   |
|               |                   | contents of a soil sampled as a |
|               |                   | Mocho soil.                     |
+---------------+-------------------+---------------------------------+
| Compartment   | 0.1 cm (HORIZN =  | NRCS Soil Data Mart (SDM)       |
| Thickness     | 1)                | ([http://soi                    |
| (DPN)         |                   | ldatamart.nrcs.usda.gov](http:/ |
|               | 1.0 cm (HORIZN =  | /soildatamart.nrcs.usda.gov/)); |
|               | 2)                |                                 |
+---------------+-------------------+---------------------------------+
| Field         | 0.283 cm^3^/cm^3^ | NRCS Soil Data Mart (SDM)       |
| Capacity      | (HORIZN =1)       | ([http://soi                    |
| (THEFC)       |                   | ldatamart.nrcs.usda.gov](http:/ |
|               | 0.283 cm^3^/cm^3^ | /soildatamart.nrcs.usda.gov/)); |
|               | (HORIZN =2)       | values are mean 1/3-bar water   |
|               |                   | contents of a soil sampled as a |
|               |                   | Mocho soil.                     |
+---------------+-------------------+---------------------------------+
| Wilting Point | 0.148 cm^3^/cm^3^ | NRCS Soil Data Mart (SDM)       |
| (THEWP)       | (HORIZN =1)       | ([http://soi                    |
|               |                   | ldatamart.nrcs.usda.gov](http:/ |
|               | 0.148 cm^3^/cm^3^ | /soildatamart.nrcs.usda.gov/)); |
|               | (HORIZN =2)       | values are mean 15-bar water    |
|               |                   | contents of a soil sampled as a |
|               |                   | Mocho soil.                     |
+---------------+-------------------+---------------------------------+
| Organic       | 1.74% (HORIZN =   | NRCS SDM; values = mean %OM /   |
| Carbon        | 1)                | 1.724.                          |
| Content (OC)  |                   |                                 |
|               | 1.74% (HORIZN =   |                                 |
|               | 2)                |                                 |
+---------------+-------------------+---------------------------------+

***Sensitive Parameter Uncertainties***

[]{.mark}

[]{.mark}

[Soil Data]{.underline}

Data sets on the Mocho series were used when possible, such as horizon
depth and organic matter content values from the USDA NRCS Soil Data
Mart (SDM) and Official Soil Series Descriptions (OSD). In general, the
selection of a hydrological soil group C or D soil is preferred to yield
"high end" runoff and erosion. In this case, a hydrologic group B soil
has been justified for use based on discussions with local agricultural
experts in the region, which indicated that row crops are limited to
hydrological group A and B soils. Additional information would be
required to reject the selection of hydrologic group B soil as a
representative soil for this scenario.

[]{.mark}

  ------------------------------------------------------------------------ ----------- -------- -------------- ----------------- ---------- --------- ------- ----------- ----------- ---------- ----------------- ------------- ------------ --------- ---------
  **Table 5. General Row Crop Bearing Soils of Kern, Monterey, San Luis                                                                                                                                                                                 
  Obispo, Santa Barbara, and Ventura Counties (California) Ranked by                                                                                                                                                                                    
  Area.**                                                                                                                                                                                                                                               

  **Soil**                                                                 **Total     **%\     **Drainage**   **Erodibility**   **Slopes   **pH**    **OM    **% Sand**  **% Silt**  **% Clay** **Yield**                                              
                                                                           Acreage**   Area**                                    (%)**                (%)**                                                                                             

                                                                                                                                                                                                 **Arti-chokes**   **Carrots**   **Celery**   **Dry     **Dry
                                                                                                                                                                                                                                              beans**   lima
                                                                                                                                                                                                                                                        beans**

  [MOCHO](http://ortho.ftw.nrcs.usda.gov/osd/dat/M/MOCHO.html)             65,338      12.78%   B              0.17-0.49         0-9        7.9-8.2   3       18.1-68.8   16.2-53.5   15-31      160               \--           900          \--       \--

  [SORRENTO](http://ortho.ftw.nrcs.usda.gov/osd/dat/S/SORRENTO.html)       48,150      9.42%    B              0.15-0.32         0-9        7.3-7.5   3       18.1-65.9   19.1-50.9   15-31      \--               1100          950          \--       \--

  [SALINAS](http://ortho.ftw.nrcs.usda.gov/osd/dat/S/SALINAS.html)         47,008      9.20%    C/B            0.2-0.37          0-9        7-8.2     2.5     18.1-41.6   33.6-50.9   21-31      160               \--           1000         \--       \--

  [CROPLEY](http://ortho.ftw.nrcs.usda.gov/osd/dat/C/CROPLEY.html)         46,171      9.03%    D/C            0.15-0.28         0-9        7-8.2     2       5.3-22.1    27.9-44.7   50         \--               \--           860          \--       45

  [CHUALAR](http://ortho.ftw.nrcs.usda.gov/osd/dat/C/CHUALAR.html)         44,295      8.67%    B              0.32              0-9        7         2.5     44.8        41.2        14         \--               1120          \--          \--       \--

  [LOS OSOS](http://ortho.ftw.nrcs.usda.gov/osd/dat/L/LOS_OSOS.html)       42,586      8.33%    C              0.17-0.32         5-30       6.1-6.7   2.5-3   35.4-39.2   33.6-37.3   23.5-31    \--               \--           \--          \--       \--

  [DIABLO](http://ortho.ftw.nrcs.usda.gov/osd/dat/D/DIABLO.html)           37,969      7.43%    D              0.15-0.24         5-30       7.3-7.5   2.5     22.1-23.3   27.9-29.2   47.5-50    \--               \--           830-920      \--       18-20

  [LOCKWOOD](http://ortho.ftw.nrcs.usda.gov/osd/dat/L/LOCKWOOD.html)       37,430      7.32%    B              0.43-0.49         0-9        6.5       3.5     39.8        37.7        22.5       \--               1200          \--          \--       65

  [ARROYO SECO](http://ortho.ftw.nrcs.usda.gov/osd/dat/A/ARROYO_SECO.html) 22,040      4.31%    B              0.37              0-9        7.3       2       45.4-67.4   19.6-41.6   13         \--               1060          770-800      \--       \--

  [PACHECO](http://ortho.ftw.nrcs.usda.gov/osd/dat/P/PACHECO.html)         15,835      3.10%    C              0.32              0-2        7.3-7.9   3       18.1-35.4   33.6-50.9   31         \--               \--           825          \--       \--

  [HUENEME](http://ortho.ftw.nrcs.usda.gov/osd/dat/H/HUENEME.html)         11,869      2.32%    C              0.24              0-2        7.9       1.25    67.9-83.5   9-19.6      7.5-12.5   \--               \--           800          \--       40

  [LEWKALB](http://ortho.ftw.nrcs.usda.gov/osd/dat/L/LEWKALB.html)         11,580      2.27%    C              0.32              0-2        8.2       0.25    68.3        19.7        12         \--               525           \--          \--       \--

  [BOTELLA](http://ortho.ftw.nrcs.usda.gov/osd/dat/B/BOTELLA.html)         11,429      2.24%    B              0.2-0.28          0-9        6.5       3-4     34.2-41.6   33.6-37.4   21-31      \--               \--           1000         \--       \--

  [DOCAS](http://ortho.ftw.nrcs.usda.gov/osd/dat/D/DOCAS.html)             10,930      2.14%    B              0.43              0-9        8.2       2       6.9         62.1        31         \--               1160          \--          \--       \--

  [MARINA](http://ortho.ftw.nrcs.usda.gov/osd/dat/M/MARINA.html)           10,843      2.12%    B              0.24              0-9        5.8       0.75    96          1.5         2.5        \--               \--           600-680      \--       \--

  [ANACAPA](http://ortho.ftw.nrcs.usda.gov/osd/dat/A/ANACAPA.html)         8,355       1.63%    B              0.28              0-9        7.2       2       67.9        19.6        12.5       \--               \--           875          \--       \--

  [ELKHORN](http://ortho.ftw.nrcs.usda.gov/osd/dat/E/ELKHORN.html)         8,120       1.59%    B/C            0.32              2-30       6.3-6.5   2-4     65.4-67.3   19.6-20.2   12.5-15    90-120            1120-1160     870-900      \--       \--

  [DANVILLE](http://ortho.ftw.nrcs.usda.gov/osd/dat/D/DANVILLE.html)       8,025       1.57%    C              0.37              0-9        7         2.5     57          18          25         \--               1000          925          \--       \--

  [GLORIA](http://ortho.ftw.nrcs.usda.gov/osd/dat/G/GLORIA.html)           6,635       1.30%    D              0.37              2-15       6.2       1.25    65.9        19.1        15         \--               1040          \--          \--       \--

  [MARIMEL](http://ortho.ftw.nrcs.usda.gov/osd/dat/M/MARIMEL.html)         5,300       1.04%    D/C            0.15-0.28         0-2        7.5       3       18.1-55.1   17.4-50.9   27.5-31    \--               \--           700-1000     \--       \--

  [TUJUNGA](http://ortho.ftw.nrcs.usda.gov/osd/dat/T/TUJUNGA.html)         4,943       0.97%    A              0.24-0.28         0-5        7-7.2     0.75    80.5-96.8   0.7-17      2.5        \--               \--           \--          42        \--

  [MOCHO                                                                   1,845       0.36%    A              0.24              0-2        7.9       1.5     70.5        16.5        13         \--               \--           900          20        \--
  VARIANT](http://ortho.ftw.nrcs.usda.gov/osd/dat/M/MOCHO_VARIANT.html)                                                                                                                                                                                 

  [SAN BENITO](http://ortho.ftw.nrcs.usda.gov/osd/dat/S/SAN_BENITO.html)   1,654       0.32%    B              0.2               9-15       7.2       2.5     35.4        33.6        31         \--               \--           \--          \--       \--

  [BAYSHORE](http://ortho.ftw.nrcs.usda.gov/osd/dat/B/BAYSHORE.html)       1,435       0.28%    B              0.28              0-2        8.2       2.5     18.1        50.9        31         140                 \--           \--          \--     \--

  [CHESTERTON](http://ortho.ftw.nrcs.usda.gov/osd/dat/C/CHESTERTON.html)   1,318       0.26%    D              0.37              5-15       6.1       0.75    67.8        22.2        10           \--              \--          740            \--     \--
  ------------------------------------------------------------------------ ----------- -------- -------------- ----------------- ---------- --------- ------- ----------- ----------- ---------- ----------------- ------------- ------------ --------- ---------

[]{.mark}

[]{.mark}

**Contacts**

**Richard Smith**

Vegetable Crop and Weed Science Farm Advisor

University of California Cooperative Extension

Monterey, Santa Cruz and San Benito Counties

1432 Abbott Street, Salinas, CA  93901

Phone: 831-759-7357

Fax 831-758-3018

***Works Cited***

EPA. 1998. Carsel, R.F., J.C. Imhoff, P.R. Hummel, J.M. Cheplick, and
A.S. Donigian, Jr. PRZM-3, A Model for Predicting Pesticide and Nitrogen
Fate in the Crop Root and Unsaturated Soil Zones: Users Manual for
Release 3.0. National Exposure Research Laboratory, Office of Research
and Development, U.S. Environmental Protection Agency, Athens, GA.

EPA. 1999. Jones, R.D., J. Breithaupt, J. Carleton, L. Libelo, J. Lin,
R. Matzner, and R. Parker. Guidance for Use of the Index Reservoir in
Drinking Water Exposure Assessments. Environmental Fate and Effects
Division, Office of Pesticide Programs, U.S. Environmental Protection
Agency, Washington, DC.

EPA. 2004. Abel, S.A. Procedure for Conducting Quality Assurance and
Quality Control of Existing and New PRZM Field and Orchard Crop Standard
Scenarios. Environmental Fate and Effects Division, Office of Pesticide
Programs, U.S. Environmental Protection Agency, Washington, DC.

Haan, C.T. and B.J. Barfield. 1978. Hydrology and Sedimentology of
Surface Mined Lands. Office of Continuing Education and Extension,
College of Engineering, University of Kentucky, Lexington KY 40506. pp
286.

TWCII. 2006. Averages and Records for Monterey, CA. The Weather Channel
Interactive, Inc. Online at:
[http://www.weather.com/outlook/recreation/outdoors/wxclimatology/monthly/graph/\
USCA0406](http://www.weather.com/outlook/recreation/outdoors/wxclimatology/monthly/graph/%0BUSCA0406)

USDA. 1990. Davis, F.M., R.A. Leonard, W.G. Knisel. GLEAMS User Manual,
Version 1.8.55. U.S. Department of Agriculture, Agricultural Research
Service (ARS), Southeast Watershed Research Laboratory, Tifton, GA.
SEWRL-030190FMD.

USDA. 2000a. Crop Profile for Carrots in California. U.S. Department of
Agriculture, Pest Management Centers. January 2000. Online at:
http://www.ipmcenters.org/CropProfiles/docs/cacarrots.html.

USDA. 2000b. Revised Universal Soil Loss Equation (RUSLE) EPA Pesticide
Project. U.S. Department of Agriculture, National Resources Conservation
Service (NRCS) and Agricultural Research Service (ARS).

USDA. 2001. Official Series Description -- MOCHO Series. U.S. Department
of Agriculture, Natural Resources Conservation Service (NRCS). Dec.
2006. Online at:
http://ortho.ftw.nrcs.usda.gov/cgi-bin/osd/osdname.cgi?-P.

USDA. 2002. 2002 Census of Agriculture. U.S. Department of Agriculture,
National Agricultural Statistics Service (NASS). Online at:
http://www.nass.usda.gov/census/census02/preliminary/2002censusdates.htm.

USDA. 2006. Soil Survey Areas of Kern, Monterey, San Luis Obispo, Santa
Barbara, and Ventura Counties. U.S. Department of Agriculture, Natural
Resources Conservation Service (NRCS), Soil Data Mart. Dec. 28, 2006.
Online at: http://soildatamart.nrcs.usda.gov.