**CALIFORNIA RIGHTS-OF-WAY**

This scenario is intended to represent rights-of-way areas including
roads, power lines, and railroads in Central/Coastal California. Unlike
most of EFED existing scenarios, the scenario is conceptually different
in that it represents a linear surface that drains into an adjacent
water body (drainage ditch). However, for this exercise, EFED assumes
that while conceptually different, the scenario is for practicality
purposes developed in a similar manner as a standard scenario that
assumes a 172 hectare field draining into a 1 hectare static pond.

Crop cover parameters for this scenario were based on typical plants
found adjacent to state maintained highway right-of ways. In most cases
rights-of-way areas are generally bare ground kept clear of vegetation
(Darren Haver of UC Cooperative Extension & Frank Spurlock of CADPR,
personal communication). Pesticides are usually applied in rights-of-way
areas to control European weeds, mustard, and thistles. Most weeds are
eradicated when they are only a few inches tall.

Rights-of-way occur throughout the state. Soils were selected with the
intent of yielding "high-end" runoff for right of way areas. The area of
interest (AOI) was refined to include areas where the greatest amount of
pesticides are used on rights-of ways. Based on 2005 California
Pesticide Use reporting data (CalPIP, 2006) approximately 45% of all
pesticides applied to rights-of-ways are applied to Los Angeles, Kern,
Ventura, Fresno, Kings, Monterey, San Luis Obispo, Santa Barbara,
Tulare, and Kings Counties. In comparison, counties in the San Francisco
bay area (San Francisco, Contra Costa, Alameda, Santa Clara, and
Sacramento) comprise approximately 13% of the total pesticide usage
(CalPIP, 2006) likely due to aggressive pesticide stewardship programs
(D. Haver, personal communication). Table 5 presents a summary of the
most common soils in the AOI, including physical soil properties
obtained from USDA (2006a). Gaviota soils were initially selected
because they are in hydrologic group D, are among the highest for
erodibility, and are among the steepest sloped soils which include the
maximum slope on which rights-of-ways are located (D. Haver, personal
communication). To verify that these soils are located in
rights-of-ways, the spatial location of soils data were cross-checked
with available rights-of-ways layers, including major roads and railways
(locations of power lines were unavailable). Figure 1 shows the location
of Gaviota soils in the AOI and the overlap with major roads and
railways.

[]{.mark}

The Gaviota series was selected for this scenario because it is located
in rights-of-way areas based on preliminary analysis, and because it is
among the most vulnerable soils in drainage, erodibility, and slope.
Gaviota is a Hydrologic Group D soil with a USLE K factor of 0.24-0.55
which includes the 90^th^ percentile of these soils in erodibility
(Table 5). The relatively low organic matter content is also expected to
result in lower microbial activity and thus reduced potential for
pesticide degradation. Gaviota soils are extensive, found mostly in the
California Coast Ranges (MLRA 15, 20) (USDA, 2006b). They are located on
hills and mountains and have slopes of 2 to 100 percent (USDA, 2006b);
however slopes in the AOI range from 5 to 75% (Table 5). Gaviota soils
have an A horizon from 0 to 10 inches (0 to 25 cm) deep. Depth to a
lithic contact of hard rock is 6 to 20 inches (USDA, 2006b). Scenario
parameters were taken from Gaviota sandy loam, 5 to 15 percent slopes,
located in northern Santa Barbara County (USDA, 2006a).

Metfile W23234 (Santa Maria) is the meteorological data set used to
represent rights-of-ways. The station is located along the coast in
Santa Barbara County within MLRA 15, in the same county as the field
used to represent rights-of-ways. The Fresno station is also in the AOI,
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).

+-----------------+----------+-----------------------------------------+
| **Table 1. PRZM |          |                                         |
| 3.12 Climate    |          |                                         |
| and Time        |          |                                         |
| Parameters for  |          |                                         |
| Cental/Coastal, |          |                                         |
| CA.**           |          |                                         |
+-----------------+----------+-----------------------------------------+
| **Parameter**   | *        | **Source/Comments**                     |
|                 | *Value** |                                         |
+-----------------+----------+-----------------------------------------+
| Starting Date   | Jan. 1,  | Meteorological File from Santa Maria,   |
|                 | 1961     | CA (W 23273).                           |
+-----------------+----------+-----------------------------------------+
| Ending Date     | Dec. 31, | Meteorological File from Santa Maria,   |
|                 | 1990     | CA (W 23273).                           |
+-----------------+----------+-----------------------------------------+
| Pan Evaporation | 0.77     | PRZM Manual Figure 5.1 (EPA 1998).      |
| Factor (PFAC)   |          | Value represents much of CA coastline.  |
+-----------------+----------+-----------------------------------------+
| Snowmelt Factor | 0        | Snow is not expected to occur in        |
| (SFAC)          |          | Central/Coastal California.             |
+-----------------+----------+-----------------------------------------+
| Minimum Depth   | 17.5     | Mid point of range (15-20), PRZM        |
| of              |          | Manual, Figure 5.2 (EPA 1998).          |
|                 |          |                                         |
| Evaporation     |          |                                         |
| (ANETD)         |          |                                         |
+-----------------+----------+-----------------------------------------+

[]{.mark}

[]{.mark}

  ------------------ ----------- ------------------------------------------
  **Table 2. PRZM                
  3.12 Erosion and               
  Landscape                      
  Parameters for San             
  Francisco --                   
  rights-of-way.**               

  **Parameter**      **Value**   **Source/Comments**

  Method to          4 (MUSS)    Default value.
  Calculate Erosion              
  (ERFLAG)                       

  USLE K Factor      0.28 tons   Gaviota sandy loam, 5 to 15 percent
  (USLEK)            EI^-1^\*    slopes, N. Santa Barbara County, CA.
                                 Number range CHAPTERNRCS Soil Data Mart
                                 Database
                                 (<http://soildatamart.nrcs.usda.gov/>).

  USLE LS Factor     1.1         Calculated according to Haan and Barfield
  (USLELS)                       (1978) equation: LS =
                                 ((λ/72.6)^m^)((430x^2^ + 30x +
                                 0.43)/6.613), where λ = slope length, x =
                                 SLP/100 and m = constant. In this case, λ
                                 = 400 m (default value) and m = 0.5 (EPA
                                 2004).

  USLE P Factor      1           No contour plowing is expected (EPA 2004).
  (USLEP)                        

  Field Area         172 ha      Default drainage area for index reservoir
  (AFIELD)                       (EPA, 2004)

  NRCS Hyetograph    2           PRZM Manual, Figure 5.12 (EPA, 1998).
  (IREG)                         

  Slope (SLP)        5 %         Slopes in right of way areas are \< 5%. In
                                 rare cases they exceed 5%. D. Haver,
                                 Watershed Management Advisor, UCCE. (EPA
                                 2004).

  Hydraulic Length   600 m       Shipman Reservoir (EPA, 1999b)
  (HL)                           

  Irrigation Flag    0           Typically no irrigation in rights-of-way
  (IRFLAG)                       areas. (Darren Haver of UC Cooperative
                                 Extension & Frank Spurlock of CADPR)

  \* EI = 100                    
  ft-tons \* in/                 
  acre\*hr                       
  ------------------ ----------- ------------------------------------------

[]{.mark}

[]{.mark}

+-----------------+-------+--------------------------------------------+
| **Table 3. PRZM |       |                                            |
| 3.12 Crop       |       |                                            |
| Parameters for  |       |                                            |
| CA --           |       |                                            |
| r               |       |                                            |
| ights-of-way.** |       |                                            |
+-----------------+-------+--------------------------------------------+
| **Parameter**   | **Va  | **Source/Comments**                        |
|                 | lue** |                                            |
+-----------------+-------+--------------------------------------------+
| Initial Crop    | 1     | Default value                              |
| (INICRP)        |       |                                            |
+-----------------+-------+--------------------------------------------+
| Initial Surface | 1     | 1= Fallow. Rights-of-way areas are usually |
| Condition       |       | bare ground and are kept clear of          |
|                 |       | vegetation. (F. Spurlock, CADPR).          |
| (ISCOND)        |       |                                            |
+-----------------+-------+--------------------------------------------+
| Number of       | 1     | Set to number of crops in simulation.      |
| Different Crops |       | Default value.                             |
| (NDC)           |       |                                            |
+-----------------+-------+--------------------------------------------+
| Number of       | 30    | Set to weather data in meteorological      |
| Cropping        |       | file: Santa Maria, CA (W 23273).           |
| Periods (NCPDS) |       |                                            |
+-----------------+-------+--------------------------------------------+
| Maximum         | 0.1   | Value is representative of light density   |
| rainfall        |       | crops (EPA, 1998). Little interception is  |
| interception    |       | expected because R.O.W areas are kept      |
| storage of crop |       | clear of vegetation. (Darren Haver of UC   |
| (CINTCP)        |       | Cooperative Extension & Frank Spurlock of  |
|                 |       | CADPR, personal communication).            |
+-----------------+-------+--------------------------------------------+
| Maximum Active  | 15 cm | Vegetation includes European weeds,        |
| Root Depth      |       | mustard, thistles, etc with root depths    |
| (AMXDR)         |       | \<6 inches. However, weeds are eradicated  |
|                 |       | at an early stage and interaction with the |
|                 |       | root zone is minimal. (Darren Haver of UC  |
|                 |       | Cooperative Extension & Frank Spurlock of  |
|                 |       | CADPR, personal communication).            |
+-----------------+-------+--------------------------------------------+
| Maximum Canopy  | 10%   | Vegetation in rights-of-way areas is       |
| Coverage        |       | eradicated at an early stage. Canopy cover |
| (COVMAX)        |       | is at most 10%. (Darren Haver of UC        |
|                 |       | Cooperative Extension)                     |
+-----------------+-------+--------------------------------------------+
| Soil Surface    | 3     | 1= Fallow. Rights-of-way areas are usually |
| Condition After |       | bare ground and are kept clear of          |
| Harvest (ICNAH) |       | vegetation. (F. Spurlock, CADPR).          |
+-----------------+-------+--------------------------------------------+
| Date of Crop    | 01/   | Vegetation emerges in late fall, beginning |
| Emergence       | 09/61 | in September. Weeds are eradicated within  |
|                 |       | a few months post-emergence. Any weeds     |
| (EMD, EMM,      |       | that are not eradicated through management |
| IYREM)          |       | die-off in mid-summer (June/July). (Darren |
|                 |       | Haver of UC Cooperative Extension).        |
+-----------------+-------+--------------------------------------------+
| Date of Crop    | 01/   |                                            |
| Maturity        | 11/61 |                                            |
|                 |       |                                            |
| (MAD, MAM,      |       |                                            |
| IYRMAT)         |       |                                            |
+-----------------+-------+--------------------------------------------+
| Date of Crop    | 02/   |                                            |
| Harvest         | 11/61 |                                            |
|                 |       |                                            |
| (HAD, HAM,      |       |                                            |
| IYRHAR)         |       |                                            |
+-----------------+-------+--------------------------------------------+
| Maximum Dry     | 0.0   | Not used in scenario.                      |
| Weight (WFMAX)  |       |                                            |
+-----------------+-------+--------------------------------------------+
| Maximum Canopy  | 15 cm | Vegetation includes European weeds,        |
| Height (HTMAX)  |       | mustard, thistles, etc with but is         |
|                 |       | generally eradicated before plants reach 6 |
|                 |       | inches in height. (Darren Haver of UC      |
|                 |       | Cooperative Extension & Frank Spurlock of  |
|                 |       | CADPR, personal communication).            |
+-----------------+-------+--------------------------------------------+
| SCS Curve       | 92,   | TR-55 (Table 2-2a). CN for paved; open     |
| Number (CN)     | 92,   | ditches (including rights-of-way).         |
|                 | 92    |                                            |
+-----------------+-------+--------------------------------------------+
| Manning\'s N    | 0.110 | Fresno Pasture, warm season (C23PWPWN).    |
| Value (MNGN)    |       | Rights-of-way were not simulated in the    |
|                 |       | RUSLE EPA Pesticide Project (USDA, 2000).  |
|                 |       | This file incorporates no tillage and has  |
|                 |       | a cover code representing first year       |
|                 |       | grass, pasture or hay crops (2). Similar   |
|                 |       | to TR-55 (Table 3-3) for short grass       |
|                 |       | surface condition.                         |
+-----------------+-------+--------------------------------------------+
| USLE C Factor   | 0.004 | Fresno Pasture, warm season (C23PWPWN).    |
| (USLEC)         |       | Rights-of-way were not simulated in the    |
|                 |       | RUSLE EPA Pesticide Project (USDA, 2000).  |
|                 |       | This file incorporates no tillage and has  |
|                 |       | a cover code representing first year       |
|                 |       | grass, pasture or hay crops (2). Similar   |
|                 |       | to TR-55 (Table 3-3) for short grass       |
|                 |       | surface condition.                         |
+-----------------+-------+--------------------------------------------+

[]{.mark}

[]{.mark}

+---------+-----------------------+------------------------------------+
| **Table |                       |                                    |
| 4. PRZM |                       |                                    |
| 3.12    |                       |                                    |
| "       |                       |                                    |
| Gaviota |                       |                                    |
| sandy   |                       |                                    |
| loam, 5 |                       |                                    |
| to 15   |                       |                                    |
| percent |                       |                                    |
| slopes" |                       |                                    |
| Soil    |                       |                                    |
| Para    |                       |                                    |
| meters, |                       |                                    |
| N.      |                       |                                    |
| Santa   |                       |                                    |
| Barbara |                       |                                    |
| County, |                       |                                    |
| CA--    |                       |                                    |
| ri      |                       |                                    |
| ghts-of |                       |                                    |
| -way.** |                       |                                    |
+---------+-----------------------+------------------------------------+
| **Para  | **Value**             | **Source/Comments**                |
| meter** |                       |                                    |
+---------+-----------------------+------------------------------------+
| Total   | 51 cm                 | Gaviota sandy loam, 5 to 15        |
| Soil    |                       | percent slopes, N. Santa Barbara   |
| Depth   |                       | County. Number range CHAPTERNRCS   |
| (CORED) |                       | Soil Data Mart Database            |
|         |                       | (<htt                              |
|         |                       | p://soildatamart.nrcs.usda.gov/>). |
|         |                       |                                    |
|         |                       | Additional data were listed for a  |
|         |                       | 4^th^ HORIZN. However, these were  |
|         |                       | not included in this soil profile  |
|         |                       | since the lower HORIZN is composed |
|         |                       | of sandstone (USDA, 2006b).        |
|         |                       |                                    |
|         |                       | []{.mark}                          |
|         |                       |                                    |
|         |                       | []{.mark}                          |
|         |                       |                                    |
|         |                       | []{.mark}                          |
|         |                       |                                    |
|         |                       | []{.mark}                          |
|         |                       |                                    |
|         |                       | Number range CHAPTERPRZM Scenario  |
|         |                       | Guidance (2004).                   |
|         |                       |                                    |
|         |                       | Adjusted using the relationship %  |
|         |                       | OC = % Organic Matter/1.724        |
|         |                       | (Doucette 2000).                   |
+---------+-----------------------+------------------------------------+
| Number  | 3                     |                                    |
| of      |                       |                                    |
| H       |                       |                                    |
| orizons |                       |                                    |
| (       |                       |                                    |
| NHORIZ) |                       |                                    |
+---------+-----------------------+------------------------------------+
| Horizon | 10 cm (HORIZN =1)     |                                    |
| Th      |                       |                                    |
| ickness | 23 cm (HORIZN =2)     |                                    |
| (THKNS) |                       |                                    |
|         | 18 cm (HORIZN =3)     |                                    |
+---------+-----------------------+------------------------------------+
| Bulk    | 1.55 g/cm3 (HORIZN    |                                    |
| Density | =1)                   |                                    |
| (BD)    |                       |                                    |
|         | 1.55 g/cm3 (HORIZN    |                                    |
|         | =2)                   |                                    |
|         |                       |                                    |
|         | 1.55 g/cm3 (HORIZN    |                                    |
|         | =3)                   |                                    |
+---------+-----------------------+------------------------------------+
| Initial | 0.173 cm3/cm3 (HORIZN |                                    |
| Water   | =1)                   |                                    |
| Content |                       |                                    |
| (THETO) | 0.173 cm3/cm3 (HORIZN |                                    |
|         | =2)                   |                                    |
|         |                       |                                    |
|         | 0.136 cm3/cm3 (HORIZN |                                    |
|         | =3)                   |                                    |
+---------+-----------------------+------------------------------------+
| Comp    | 0.1 cm (HORIZN = 1)   |                                    |
| artment |                       |                                    |
| Th      | 1 cm (HORIZN = 2)     |                                    |
| ickness |                       |                                    |
| (DPN)   | 3 cm (HORIZN = 3)     |                                    |
+---------+-----------------------+------------------------------------+
| Field   | 0.173 cm3/cm3 (HORIZN |                                    |
| C       | =1)                   |                                    |
| apacity |                       |                                    |
| (THEFC) | 0.173 cm3/cm3 (HORIZN |                                    |
|         | =2)                   |                                    |
|         |                       |                                    |
|         | 0.136 cm3/cm3 (HORIZN |                                    |
|         | =3)                   |                                    |
+---------+-----------------------+------------------------------------+
| Wilting | 0.087 cm3/cm3 (HORIZN |                                    |
| Point   | =1)                   |                                    |
| (THEWP) |                       |                                    |
|         | 0.087 cm3/cm3 (HORIZN |                                    |
|         | =2)                   |                                    |
|         |                       |                                    |
|         | 0.066 cm3/cm3 (HORIZN |                                    |
|         | =3)                   |                                    |
+---------+-----------------------+------------------------------------+
| Organic | 0.44 % (HORIZN =1)    |                                    |
| Carbon  |                       |                                    |
| Content | 0.44 % (HORIZN =2)    |                                    |
| (OC)    |                       |                                    |
|         | 0.15 % (HORIZN =3)    |                                    |
+---------+-----------------------+------------------------------------+

[]{.mark}

[]{.mark}

[]{.mark}

  ---------------------------------------------------------------------------------------------------------------------------
  **Table 5.                                                                                                      
  Most common                                                                                                     
  soils located                                                                                                   
  in the AOI                                                                                                      
  based on USDA                                                                                                   
  2006 soils                                                                                                      
  data.                                                                                                           
  Includes                                                                                                        
  soils greater                                                                                                   
  than 0.5% of                                                                                                    
  the total                                                                                                       
  soil area in                                                                                                    
  the AOI.**                                                                                                      
  ------------- --------- ------- ---------- ------------- -------- --------- ----------- ----------- ----------- -----------
  Soil          Total     \% Area Drainage   Erodibility   Slopes   pH        OM (%)      \% Sand     \% Silt     \% Clay
                Acreage                                    (%)                                                    

  CAJON         320,500   2.71%   A          0.15-0.28     0-15     7.9-8.2   0-0.75      67.4-96     1.5-19.6    2.5-13

  SANTA LUCIA   317,848   2.69%   C          0.1-0.49      2-75     5.8-6.1   1.5-10      17.4-35.4   33.6-52.6   30-31

  NACIMIENTO    290,396   2.46%   C          0.24-0.43     9-75     8.2       2-3.5       18.1-39.2   33.6-50.9   23.5-31

  KIMBERLINA    282,393   2.39%   C/B        0.24-0.43     0-9      7.5-8.2   0.4-0.75    68.3-71.3   16.7-19.7   12

  CIENEBA       281,315   2.38%   C          0.24-0.37     15-85    6.1-6.7   0.5-0.75    45.7-68.3   19.2-41.8   8-12.5

  ROCK OUTCROP  237,955   2.01%   D/         \-            15-100   \-        \-          \-          \-          \-

  PANOCHE       224,969   1.90%   B          0.28-0.43     0-9      7.9-8.5   0.25-0.75   35.4-66     15-37.7     19-31

  HANFORD       180,590   1.53%   B          0.2-0.37      0-9      6.3-7     0.75-1.5    45.7-71     16.5-41.8   12.5

  LOS OSOS      172,555   1.46%   C          0.17-0.32     5-75     6.1-6.7   2.5-3       35.4-39.2   33.6-37.3   23.5-31

  VISTA         161,940   1.37%   C          0.28-0.37     3-75     6.5-6.7   0.75        65.4-67     22-23.6     11

  NORD          151,063   1.28%   B          0.28-0.37     0-2      7.5-8.8   1.5-2.5     45-70       16-41       14

  AUBERRY       149,370   1.26%   B          0.28          3-70     5.8-6.1   2           65.7-67     21.5-22.8   11.5

  SHEDD         149,334   1.26%   C          0.2-0.43      9-75     8.2       2.5-3       6.7-9.1     62.1-64.9   26-31

  BLASINGAME    147,130   1.24%   C          0.24-0.37     3-70     6.7       1.25-1.5    34-65.1     18.9-38.5   16-28.5

  LINNE         144,639   1.22%   C          0.2-0.32      5-75     8.2       2.5-3.5     18.1-35.4   33.6-50.9   31

  HESPERIA      142,962   1.21%   B          0.2-0.32      0-9      7-8.5     0.25-0.75   67.4-68     19.5-19.6   12.5-13

  WASCO         139,578   1.18%   A/B        0.24-0.37     0-5      7-7.2     0.25-0.8    60-70.5     16.5-28     12-13

  GAVIOTA       137,277   1.16%   D          0.24-0.55     5-75     6.3-7.3   0.5-1.5     44.8-70     16.4-41.2   11-14

  SAN JOAQUIN   130,299   1.10%   D          0.32-0.37     0-9      6.1-7.2   0.75-1.5    42-66       19-38       15-20

  WALONG        130,158   1.10%   B          0.2-0.24      15-75    7.2       1.5         67.9-68     19.5-19.6   12.5

  EXETER        128,019   1.08%   C          0.24-0.37     0-9      6.7-7.3   0.5-1.5     44-66       19-41       15

  BALCOM        124,600   1.05%   B          0.32          9-75     8.2       0.75        39.8        37.7        22.5

  TULARE        118,377   1.00%   D          0.28          0-1      8.2       2.5         22.1        27.9        50

  MILHAM        117,470   0.99%   D/B        0.32          0-9      7.4-7.9   0.5-0.75    59-67.9     19.1-22     12.5-19

  GARCES        108,362   0.92%   D          0.49          0-2      7.8-8.5   0.25-0.75   30.4-44.8   41.2-55.6   14

  ARBUCKLE      101,800   0.86%   B          0.37          0-75     6.5-7     0.75        43-68.8     16.2-38.5   13-18.5

  ARNOLD        100,455   0.85%   B/A        0.15-0.28     5-75     5.6-6.7   0.75        78.5-96     1.5-16.5    2.5-5

  SUR           97,675    0.83%   B          0.32          50-85    6.5       1.5         65.9        19.1        15

  LOPEZ         94,331    0.80%   D          0.15-0.37     9-99     5.6-6.5   1.5-6       34.7-39.2   33.5-37.8   23.5-31

  SHERIDAN      92,620    0.78%   B          0.37          5-75     6.5       3           68.1        18.9        13

  KETTLEMAN     91,206    0.77%   B          0.32-0.37     5-75     7.5-8.2   0.25-0.75   39.8-68.8   16.2-37.7   15-22.5

  GRANGEVILLE   88,358    0.75%   A/B        0.32-0.37     0-2      7.2-9.8   1.5-3.5     30.4-70.5   16.5-55.6   13-14

  COLPIEN       87,886    0.74%   B          0.37          0-2      7.5       2           39.8-39.8   37.7        22.5

  DIABLO        86,192    0.73%   D          0.15-0.28     2-60     7.3-7.6   1.5-2.5     5.3-23.3    27.9-44.7   47.5-50

  CHAMISE       83,162    0.70%   B/D        0.15-0.37     2-75     5.8-6.2   3.5-4.5     35.4-67.2   15.3-37.7   15-31

  NAHRUB        79,920    0.68%   D          0.37-0.43     0-2      8.7-9.5   0.5-0.75    21.7-26.1   28.9-54.8   23.5-45

  MOCHO         79,711    0.67%   B          0.17-0.49     0-9      7.9-8.2   3           18.1-68.8   16.2-53.5   15-31

  LETHENT       74,555    0.63%   D          0.37-0.43     0-2      8-9.5     0.25-2      21.7-69.6   16.4-54.8   14-31

  GAZOS         71,093    0.60%   C          0.17-0.49     9-75     6.1-6.7   2-3         18.1-42.4   37.3-57.6   19.5-31

  CENTERVILLE   66,825    0.57%   D          0.2-0.24      0-30     7.3-7.5   1.5         22-22.1     27.9-28     50

  METZ          65,770    0.56%   A/B        0.15-0.32     0-9      7.2-8.2   0.75        63.5-79.2   15.8-26.5   5-10

  CIBO          65,114    0.55%   D          0.2-0.37      2-75     6.7-7.5   1.5         26-28.1     28.9-29.4   42.5-45

  GEPFORD       64,074    0.54%   D          0.28          0-1      7.9-8.2   1.5         3-17.1      27.9-42     55

  LOCKWOOD      61,210    0.52%   B          0.28-0.49     0-15     6.5-6.7   3.5         39.8-39.8   37.7        22.5

  MILLSHOLM     60,849    0.51%   D          0.24-0.49     15-75    6.1-6.7   0.75-2      34.2-39.2   37.3-37.3   23.5-28.5

  LODO          60,696    0.51%   D          0.17-0.24     5-75     6.5-7.6   2.5-3.5     35.2-39.8   33.6-38.3   22.5-31
  ---------------------------------------------------------------------------------------------------------------------------

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![](media/image1.png){width="4.872222222222222in"
height="5.936111111111111in"}![](media/image2.png){width="3.7354166666666666in"
height="5.9625in"}

**Figure 1. Locations of Rights-of-way used for scenario development
including NRCS spatial soils data availability (left) and Red-legged
frog critical habitat designations (right) from the USFWS.**

**Contacts**

**Frank Spurlock, Ph.D.**

Frank Spurlock, Ph.D.

Research Scientist III

Environmental Monitoring

CA Department of Pesticide Regulation

1001 I Street, P.O. Box 4015

Sacramento CA 95812-4015

Phone (916) 324-4124

**Darren L. Haver, Ph.D.**

Watershed Management Advisor

Orange County

1045 Arlington Drive, Gate 4

Costa Mesa, CA 92626

Phone: (714) 708-1613

Fax: (714) 708-2754

http://ceorange.ucdavis.edu

Email: <dlhaver@ucdavis.edu>

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**References**

CalPIP. 2006. 2005 Pesticide Usage Reporting. California Pesticide
Information Portal, CA Department of Pesticide Regulation. Accessed
December 4, 2006. Online at:
<http://calpip.cdpr.ca.gov/cfdocs/calpip/prod/main.cfm>

Number range CHAPTEREPA. 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.

Number range CHAPTEREPA. 2004. Pesticide Root Zone Model (PRZM) Field
and Orchard Crop Scenarios: Guidance for Selecting Field Crop and
Orchard Scenario Input Parameters. November 15, 2001; Revisions July
2004.

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, Kentucky
40506. pp. 286.

USDA. 2006a. Soil Survey Areas of Central/Coastal California. U.S.
Department of Agriculture, Natural Resources Conservation Service
(NRCS), Soil Data Mart. March 1, 2006. Online at:
[http://soildatamart.nrcs.usda.gov](http://soildatamart.nrcs.usda.gov/).

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