Imperial County Air Pollution Control District Rule 806 

806-1

RULE 806 CONSERVATION MANAGEMENT PRACTICES

(Adopted 11/08/2005; Revised 10/16/2012)

A. Purpose

The purpose of this regulation is to reduce the amount of coarse Particulate 

Matter (PM-10) entrained in the ambient air as a result of emissions generated 

from Agricultural Operation Sites by requiring Conservation Management 

Practices to prevent, reduce, or mitigate PM-10 emissions.

B. Applicability

This rule applies to Agricultural Operation Sites located within Imperial County. 

Effective on and after January 1, 2013, an owner/operator shall implement the 

applicable CMPs selected for each Agricultural Operation Site. The provisions of 

this rule adopted on November 8, 2005 shall remain in effect until January 1, 

2013 at which time the amendments adopted on October 16, 2012 shall take 

effect.

C. Definitions

In addition to the definitions of terms in Rule 800 (General Requirements for 

Control of Fine Particulate Matter (PM-10), the following definitions shall govern 

the implementation of this rule:

C.1 AGRICULTURAL OPERATIONS: The growing and harvesting of crops for 

the primary purpose of earning a living.

C.2 AGRICULTURAL OPERATION SITE: One or more agricultural parcels 

that meet the following:

C.2.a Are under the same or common ownership or operation, or which 

are owned or operated by entities which are under common control; 

and

C.2.b Are located on one or more contiguous or adjacent properties 

wholly within Imperial County.

C.3 AGRICULTURAL PARCEL: A portion of real property used by an owner 

or operator for carrying out a specific agricultural operation. Roads, 

vehicle/equipment traffic areas, and facilities, on or adjacent to the 

cropland are part of the agricultural parcel.

C.4 ALTERNATIVE TILLING: Till alternative rows for weed management, 

reducing approximately 50% of field activity related to tilling, in addition to 

stabilizing soil surface and reducing soil compaction.
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C.5 APPLICATION EFFICIENCIES: Use more efficient application equipment 

so as to reduce a minimum of one ground operation. Examples include: 

compact or low volume spray equipment; aerial applications; micro-heads 

or infrared spot sprayers; electrostatic sprayers. Reduces soil 

compaction, passes and chemical usage.

C.6 BALING/LARGE BALES: Reduce a minimum of one pass through the field 

per acre by using large balers to harvest crops.

C.7 BED/ROW SIZE OR SPACING: Reduce a minimum of one tillage 

operation by Increasing or decreasing the size of the planting bed area 

(can be done for field and permanent crops) or adjusting spacing. 

Spacing adjustments reduce the number of passes and soil disturbance 

by increasing plant density/canopy through reduction of row width to 

contain PM within the canopy.

C.8 BULK MATERIALS CONTROL: Minimize visible dust emissions from bulk 

materials by using dust suppressant or water to form a stabilized surface, 

or using a tarp to fully cover the pile or truckbed, or using a wind barrier or 

3-sided structure to reduce entrainment of fugitive dust.

C.9 CHEMIGATION/FERTIGATION: Reduce a minimum of one ground 

operation by applying chemicals through an irrigation system. This

reduces the need to travel in the field for application purposes, thus 

reducing operations and soil disturbance while increasing the efficiency of 

the application.

C.10 CHIPS/MULCHES, ORGANIC MATERIALS, POLYMERS, ROAD OIL & 

SAND: Application of any nontoxic chemical or organic dust suppressant 

that meets all specification required by any federal, state, or local water 

agency and is not prohibited for use by any applicable regulations.

Chips/Mulches and organic materials should meet the specifications in the 

mulches definition below. Polymers, road oil and sand should create a 

stabilized surface during high traffic times such as harvest.

C.11 COMBINED OPERATION: Combine equipment to perform several 

operations during one pass, thereby reducing a minimum of one tillage 

operation. Examples include: use of one-pass till equipment in ground 

preparation or crop tillage; and cultivation and fertilization of a field crop in 

a single pass. Other benefits are reduction of soil compaction and time to 

prepare fields, both of which can be precursors to additional tillage 

requirements. If a combined operation is accomplished through equipment 

change/technological improvement, that action is considered one CMP, 

and either Equipment Changes/Technological Improvements CMP or 

Combined Operations CMP may be selected in a CMP Plan, but not both.
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C.12 CONSERVATION IRRIGATION: Reduce a minimum of one tillage 

operation related to weeding by conserving the amount of water used by 

using either drip, sprinkler, or buried/underground line irrigation. 

Conserving water reduces weed population, which in turn reduces the 

need for tillage and reduces soil compaction.

C.13 CONSERVATION MANAGEMENT PRACTICE (CMP): An activity or 

procedure that prevents, reduces, or mitigates PM-10 normally emitted by, 

or associated with, an agricultural activity.

C.14 CONSERVATION MANAGEMENT PRACTICES PLAN (CMP PLAN): A 

document prepared by the owner or operator of an Agricultural Operation 

site that lists the selected CMPs for implementation. The CMP Plan also 

contains, but is not limited to, contact information for the owner or 

operator, a description of the Agricultural Operation Site and locations of 

Agricultural Parcels, and other information describing the extent and 

duration of CMP implementation.

C.15 CONSERVATION TILLAGE (e.g.: no tillage, minimum tillage): A tillage 

system that reduces a minimum of three tillage operations. This system 

reduces soil and water loss by reducing the number of passes and by 

leaving crop residue on the field after harvest as well as managing the 

residue so that it remains intact during the planting season. It reduces the 

number of passes and amount of soil disturbance. It improves soil 

because it retains plant residue and increases organic matter.

C.16 COVER CROPS: Establish cover crops that maintain a minimum of 60 

percent ground cover, as determined by the Line Transect Test Method. 

Native or volunteer vegetation that meets the minimum ground cover 

requirement is acceptable. 

C.17 CROP RESIDUE MANAGEMENT: Maintain crop residue from previous 

crops until tilling for the next crop. Crop residues must maintain a 

minimum of 60 percent ground cover as determined by Line Transect Test 

Method. Implements such as undercuters or sweeps can maintain crop 

residues without burying or destroying residues.

C.18 CROPLAND - OTHER: This CMP category includes CMPs to reduce 

windblown emissions.

C.19 CROSS WIND STRIPCROPING: Establish crops in parallel strips across 

the prevailing wind erosion direction and arranged so that strips 

susceptible to wind erosion are alternated with strips having a protective 

cover that is resistant to wind erosion. The strips with the protective cover 

should be at least as wide as the strips susceptible to wind erosion.
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C.20 EQUIPMENT CHANGES/TECHNOLOGICAL IMPROVEMENTS: Reduce 

a minimum of one tillage operation by modifying equipment or making 

technological improvements. Examples include flame cultivation or 

equipment that combines discing, chiseling and ring rolling. If an 

equipment change/technological improvement is made in order to 

combine operations, that action is considered one CMP; either Equipment 

Changes/Technological Improvements CMP or Combined Operations 

CMP may be selected in the CMP plan, but not both.

C.21 FALLOW LAND: Temporary or permanent removal from production. 

Eliminates entire operation/passes or reduces activities.

C.22 FIELD WINDBREAKS: Plant or maintain a single or multiple row of trees 

or shrubs adjacent to windward edge of the field as close to perpendicular 

as practical with the direction of erosive winds. Windbreaks such as trees 

or shrubs should be established at a right angle to the prevailing wind 

direction. Sites downwind of the windbreak are considered protected if 

they fall within an area that is less than or equal to 10 times the height of 

the windbreak. The windbreak should have a porosity of 50 %.

C.23 GRAVEL: Placing a layer of Gravel at least 3 inches in depth to minimize 

dust generated from vehicle movement and to dislodge any excess debris 

which can become entrained. Gravel should conform to the grading 

defined in Rule 800.

C.24 GREEN CHOP: Reduce a minimum of one ground operation by 

harvesting a forage crop without allowing it to dry in the field. This 

practice reduces soil disturbance and soil compaction.

C.25 GRINDING/CHIPPING/SHREDDING: Grinding pruning’s and orchard 

removals instead of burning; incorporate to soil. Reduces PM from burning 

crop residues.

C.26 GROUND OPERATION: An agricultural operation that is not a tillage 

operation that involves equipment passing across the field, such as a 

chemical spray application. A pass through the field may be a subset of a 

ground operation.

C.27 HAND HARVESTING: Reduce a minimum of one ground operation by 

harvesting a crop by hand. It reduces soil disturbance due to machinery 

passes.

C.28 INTEGRATED PEST MANAGEMENT: Reduce a minimum of one ground 

operation by using a combination of techniques including organic, 

conventional and biological farming concepts to suppress pest problems. 
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It creates beneficial insect habitat that reduces the use of 

herbicides/pesticides thereby reducing number of passes for spraying. It 

also reduces soil compaction and the need for additional tillage. If 

integrated pest management CMP uses the same practices described in 

the Organic Practices CMP, this action is considered one CMP, and either 

Integrated Pest Management CMP or Organic Practices CMP may be 

selected in a CMP plan, but not both.

C.29 IRRIGATION POWER UNITS: Use cleaner burning engines, electric 

motors (CMP only applicable if engines are cleaner than otherwise 

required by current local, state and federal requirements).

C.30 MULCHING: Reducing PM10 emissions and wind erosion and preserving 

soil moisture by uniformly applying a protective layer of plant residue or 

other material to a soil surface prior to disturbing the site to reduce soil 

movement. Mulching material shall be evenly applied, and if necessary, 

anchored to the soil. Mulch should achieve a minimum 70% cover, and a 

minimum of 2 inch height above the surface. Inorganic material used for 

mulching should consist of pieces of .75 to 2 inches in diameter.

C.31 NIGHT FARMING: Operate at night when moisture levels are higher and 

winds are lighter. It decreases the concentration of PM emissions during 

daytime and the increased ambient humidity reduces PM emissions during 

the night. Night farming should take place between sundown and sunrise.

C.32 NIGHT HARVESTING: Implementing harvesting practices at night when 

moisture levels are higher and winds are lighter. It reduces PM by 

operating when ambient air is moist, thereby reducing PM emissions.

Night harvesting should take place between sundown and sunrise.

C.33 NO BURNING: Switching to a crop/system that would not require waste 

burning. It reduces emissions associated with burning.

C.34 NON TILLAGE/CHEMICAL TILLAGE: Reduce a minimum of one tillage

operation by, for example, using a flail mower or low volume sprayers. It 

reduces soil compaction and stabilizes soil.

C.35 ORGANIC PRACTICES: Reduce a minimum of one ground or tillage 

operation by using biological control methods or non-chemical control 

methods. Examples include: organic certification, biological controls, 

mulches and humus. If an organic practice CMP uses the same practice 

as described in the integrated pest management CMP, this action is 

considered one CMP, and either Organic Practices CMP or Integrated 

Pest Management CMP may be selected in a CMP plan, but not both.

C.36 PAVING: To pave currently Unpaved Roads.
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C.37 PERMANENT CROPS: Having an established permanent crop that is not 

replanted annually.

C.38 PRECISION FARMING (GPS): Reduce a minimum of one pass through 

the field per acre by using satellite navigation to calculate position in the 

field, therefore manage/treat the selective area. It reduces overlap and 

allows operations to occur during inclement weather conditions and at 

night thereby generating less PM.

C.39 PRE-HARVEST SOIL PREPARATION: Applying a water or stabilizing 

material to soil prior to harvest to form a visible crust. It reduces PM 

emissions at harvest.

C.40 REDUCED PRUNING: Reduce a minimum of one ground operation by 

reducing the frequency of pruning (e.g. one time per year, or every other 

year).

C.41 RESTRICTED ACCESS: To restrict or eliminate public access to unpaved 

private roads with signs or physical obstructions. At each access point, 

install signs or physical barriers such as gates, fencing, posts, signs, 

shrubs, trees that block or effectively control access to the area. It reduces 

vehicle traffic and thus reduces associated fugitive dust.

C.42 RIDGE ROUGHNESS: Establish stabilized ridges by normal tillage and 

planting equipment as close to perpendicular as practical with the direction 

of erosive winds (not appropriate for unstable soils such as sands or 

loamy sands). After establishment, ridges shall be maintained through 

those periods when wind erosion is expected to occur, or until growing 

crops provide enough cover to protect the soil from wind erosion. Ridge 

spacing should be no greater than 4 times the ridge height.

C.43 ROAD MIX: A mixture of tank bottoms from crude oil storage tanks, 

material from crude oil spills, or other crude-oil-containing soil mixed with 

aggregates and soils, that are used as a base cover materials for roads, 

parking lots, berms, tank and well locations, or similar applications.

C.44 SHED PACKING: Reducing a minimum of one pass through the field per 

acre by packing commodities in a covered or closed area, rather than 

field-pack. It reduces field traffic, thereby reducing PM emissions.

C.45 SHUTTLE SYSTEM/LARGE CARRIER: Reduce a minimum of one pass 

through the field per acre by hauling multiple or larger trailers/bins per trip.

C.46 SOIL AMENDMENTS: Organic or chemical materials uniformly applied to 

the soil for improvement (e.g: gypsum, lime, polyacrylamide).
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C.47 SPEED LIMITS: Control speed limits to 15 mph on unpaved roads through 

worker behavior modifications, signage, or any other necessary means.

C.48 SULFUR REDUCTION OR ELIMINATION: Reduce a minimum of one 

ground operation by reducing or eliminating sulfur dusting, an organic 

chemical used to control disease in crop, ornamental and home and 

gardens.

C.49 SURFACE ROUGHENING: Produce and maintain stable clods or 

aggregates on the land surface by bedding, rough disking, or tillage that 

leaves the surface covered by stable clods. Soil clods prevent wind 

erosion because they resist the forces of the wind and because they 

shelter other erodible materials. This CMP should be implemented 

consistent with NRCS Code 609 – Surface Roughening.

C.50 TILLAGE OPERATION: An agricultural operation that mechanically 

manipulates the soil for the enhancement of crop production. Examples 

include discing, weeding, or bedding. A pass through the field may be a 

subset of a tillage operation.

C.51 TRACK-OUT CONTROL: Minimize any and all material that adheres to 

and agglomerates on all vehicle and equipment from unpaved roads and 

falls onto a paved public road or the paved shoulder of a paved public 

road. Install one of the following devices: a grizzly, a gravel pad or a 

wheelwash system at all intersections of unpaved roads and public roads.

C.52 TRANSGENIC CROPS: Use of GMO or Transgenic crops such as 

“herbicide-ready” to reduce a minimum of one tillage operation. It reduces 

the need for tillage or cultivation operations, as well as reduces soil 

disturbance. It can also reduce the number of chemical applications.

C.53 WATER APPLICATION: Application of water to unpaved roads and traffic 

areas to create a visibly moist surface.

C.54 WIND BARRIER: Reduce wind erosion by planting or maintaining 

perennial or annual plants established in rows or narrow strips 

interspersed throughout a crop field as close to perpendicular as practical 

with the direction of erosive winds. To be effective, the selected plant(s) 

must create a stand at least three feet tall, with a porosity of 50%.

D. Requirements for Agricultural Operation Sites:

D.1 All Persons who own or operate an Agricultural Operation Site of forty (40) 

acres or more in size shall implement in each Agricultural Parcel at least 

one of the Conservation Management Practices from each of D.1.a 

through D.1.f. unless they implement the Conservation Tillage CMP. On 
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acres implementing the Conservation Tillage CMP, persons do not need 

to select additional measures for D.1.a, D.1.b or D.1.e, but do need to 

implement at least one CMP each from D.1.c, D.1.d and D.1.f. Persons 

may choose the same CMP for D.1.c and D.1.d since they apply to 

different land, but must choose a unique and individual CMP for each of 

D.1.a, D.1.b, D.1.e and D.1.f (unless using Conservation Tillage CMP) 

since they apply to the same land.

D.1.a Land preparation and cultivation, CMPs in Section E.1;

D.1.b Harvest activities, CMPs in section E.2;

D.1.c Unpaved Roads, CMPs in Section E.3;

D.1.d Unpaved Traffic Areas, CMPs in Section E.4;

D.1.e Cropland-Other, CMPs in Section E.5; and

D.1.f Windblown Dust Control, CMPs in Section E.6.

D.2 Agricultural unpaved roads with greater than fifty (50) or more vehicle daily 

trips (VDT), or twenty (20) or more VDT with three (3) or more axle 

vehicles, must meet the stabilization and opacity requirements in Section 

E.3.

D.3 Agricultural unpaved equipment or traffic areas with fifty (50) or more VDT, 

or twenty (20) or more VDT with 3 or more axle vehicles, must meet the 

stabilization and opacity requirements in Section E.4.

D.4 The owner or operator of an Agricultural Operation Site may implement 

more than one Conservation Management Practices for one or more of 

the categories.

D.5 The owner or operator of an Agricultural Operation Site shall ensure that 

the implementation of each selected Conservation Management Practices 

does not violate any other local, state, or federal law.

D.6 The owner or operator of an Agricultural Operation Site may develop 

alternative CMPs. The owner or operator shall submit to the APCD a 

technical evaluation of the alternative CMPs, demonstrating that the 

alternative CMP achieves PM-10 emission reductions that are at least 

equivalent to the most effective CMPs available for the applicable 

operation (e.g., by eliminated equivalent passes or operations). The 

APCD will review the technical evaluation, and the alternative CMP must 

receive approval by the APCD before being included in the CMP Plan.
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D.7 The owner or operator shall prepare a CMP Plan for each Agricultural 

Operation Site. The CMP Plan shall be made available to the APCD upon 

request. The CMP Plan shall be provided to the APCD within 72 hours of 

notice to the owner or operator.

E. Conservation Management Practices for Fugitive Dust (PM-10)

E.1 The owner or operator of an Agricultural Operation Site shall implement at 

least one of the following CMPs in each Agricultural Parcel to reduce 

PM10 emissions from land preparation and cultivation (CMP Category 

D.1.a). If the owner or operator selects “Fallow Land” as its CMP, the 

owner/operator must comply with section E.6 of this rule.

E.1.a Alternative Tilling,

E.1.b Bed/Row Size Spacing,

E.1.c Chemigation/Fertigation,

E.1.d Combined Operations,

E.1.e Conservation Irrigation,

E.1.f Cover Crops,

E.1.g Equipment Changes/Technological Improvements,

E.1.h Fallow Land,

E.1.i Integrated Pest Control,

E.1.j Mulching,

E.1.k Night Farming,

E.1.l Non Tillage /Chemical Tillage,

E.1.m Organic Pesticides,

E.1.n Precision Farming (GPS), or

E.1.o Transgenic Crops

E.2 The owner or operator of an Agricultural Operation Site shall implement at 

least one of the following CMPs in each Agricultural Parcel to reduce 

PM10 emissions from harvest activities (CMP Category D.1.b). If the 

owner or operator selects “Fallow Land” as its CMP, the owner/operator 

must comply with Section E.6 of this rule.

E.2.a Baling /Large Bales

E.2.b Combined Operations

E.2.c Equipment Changes/Technological Improvements

E.2.d Green Chop

E.2.e Hand Harvesting

E.2.f Fallow Land

E.2.g Night Harvesting

E.2.h No Burning

E.2.i Pre-Harvesting Soil Preparation

E.2.j Shed Packing

E.2.k Shuttle System/Large Carrier
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E.3 The owner or operator of an Agricultural Operation Site shall implement at 

least one of the following CMPs for each unpaved road (CMP Category 

D.1.c) to reduce PM10 emissions at all times:

E.3.a Chips/Mulches, Organic Materials, polymers, road oil and sand,

E.3.b Gravel

E.3.c Paving,

E.3.d Restricted access

E.3.e Speed limit

E.3.f Track-out control

E.3.g Water Application

E.3.h Field windbreak

On each day that high traffic accounts for 50 or more vehicle daily trips 

(VDT), or 20 or more VDT with 3 or more axles, on an unpaved road 

segment, the owner/operator of an Agricultural Operation Site shall 

comply with the requirements of a stabilized unpaved road and limit VDE 

to 20% opacity by implementing or maintaining one or more of the 

following CMPs:

E.3.i Pave.

E.3.j Apply Chemical Stabilization as directed by product manufacturer 

to control dust on Unpaved Roads.

E.3.k Apply and maintain Gravel, recrushed/recycled asphalt or other 

material of low Silt (<5%) content to a depth of three or more 

inches.

E.3.l Water Application.

E.3.m Permanent road closure.

E.3.n Restrict unauthorized vehicle access.

E.4 The owner or operator of an agricultural operation site shall implement at 

least one of the following CMPs for each unpaved traffic area (CMP 

Category D.1.d) to reduce PM10 emissions at all times:

E.4.a Chips/Mulches, Organic Materials, Polymers, Road Oil and Sand,

E.4.b Gravel

E.4.c Paving

E.4.d Restricted Access

E.4.e Speed Limit

E.4.f Track-Out Control

E.4.g Water Application

E.4.h Field windbreak

On each day that high traffic accounts for 50 or more vehicle daily trips 

(VDT), or 20 or more VDT with 3 or more axles, on an Unpaved Traffic 
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Area larger than one (1) acre, the owner/operator of an Agricultural 

Operation Site shall comply with the requirements of a stabilized unpaved 

road and limit VDE to 20% opacity by implementing or maintaining one or 

more of the following CMPs:

E.4.i Pave.

E.4.j Apply Chemical Stabilization as directed by product manufacturer 

to control dust on Unpaved Roads.

E.4.k Apply and maintain Gravel, recrushed/recycled asphalt or other 

material of low Silt (<5%) content to a depth of three or more 

inches.

E.4.l Water Application.

E.5 The owner or operator of an Agricultural Operation Site shall implement at 

least one of the following CMPs in each Agricultural Parcel to reduce 

PM10 emissions from cropland-others (Category D.1.e). If the owner or 

operator selects “Fallow Land” as its CMP, the owner/operator must 

comply with Section E.6 of this rule.

E.5.a Alternate Tilling

E.5.b Application Efficiencies

E.5.c Bailing/Large Bales

E.5.d Bulk Materials Control

E.5.e Chemigation/Fertigation

E.5.f Conservation Irrigation

E.5.g Fallow Land

E.5.h Grinding/Chipping/Shredding

E.5.i Integrated Pest Management

E.5.j Irrigation Power Units

E.5.k Mulching

E.5.l Night Farming

E.5.m No Burning

E.5.n Non Tillage/Chemical Tillage

E.5.o Organic Practices

E.5.p Permanent Crops

E.5.q Reduced Pruning

E.5.r Soil Amendments

E.5.s Soil Incorporation

E.5.t Sulfur: Reduction or Elimination of Dusting

E.5.u Surface Roughening

E.5.v Transgenic Crops

E.5.w Wind Barrier

E.6 For windblown dust control (CMP Category D.1.f), the owner or operator 

of an agricultural operation site shall implement E.6.1. In addition to 

following E.6.1, if the owner or operator of an Agricultural Operation Site 
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has fields that are in between crops or more permanently fallow, the 

owner or operator shall implement at least one of the CMPs in E.6.2.

E.6.1 When preparing a field for planting, minimize the time that newly 

tilled soil is smooth and dry by leaving the field surface with large 

clods for as long as possible and bedding and planting the field as 

soon as possible once it no longer has large clods.

E.6.2 For fields that are in between crops or are permanently fallow, the 

owner shall implement at least one of the CMPs below:

E.6.2a Cover Crop

E.6.2b Conservation Tillage

E.6.2c Crop Residue Management

E.6.2d Cross Wind Stripcropping

E.6.2e Field Windbreaks

E.6.2f Ridge Roughness

E.6.2g Surface Roughening

E.6.2h Wind Barrier

F. CMP Plan Preparation

An owner or operator shall prepare a CMP Plan for each Agricultural Operation 

Site. An owner or operator must maintain a CMP Plan that corresponds to the 

current crops being grown in the field and the corresponding CMPs for those 

crops. Each CMP Plan shall include, but is not limited to, the following 

information:

F.1 The name, business address, and telephone number of the owner or 

operator responsible for the preparation and implementation of the CMP 

Plan.

F.2 The signature of the owner or operator and the date that the CPM Plan 

was signed.

F.3 The location of the Agricultural Operation Site: cross roads; canal and 

gate number.

F.4 The crop grown at each location covered by the CMP Plan, total acreage 

for each crop, the length (miles) of unpaved roads, and the total area 

(acres or square feet) of the unpaved equipment and traffic areas to be 

covered by the CMP Plan

F.5 The CMPs being implemented for each crop, unpaved road, unpaved 

equipment and traffic area, and windblown dust control. The CMPs 

implemented should be described to verify that implementation is 
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consistent with the CMP definitions in this rule.

F.6 Other relevant information as determined by the APCD.

G. Violations

Failure to comply with any provisions of this rule shall constitute a violation of 

Regulation VIII. Failure to comply with the provisions of a CMP Plan shall also 

constitute a violation of Regulation VIII.

H. Record of Control Implementation

Any Person subject to the requirements of this rule shall maintain a copy of the 

CMP Plan and any supporting documentation necessary to confirm 

implementation of the CMPs. An owner or operator implementing alterative 

CMPs shall maintain a copy of technical evaluation for alternative CMPs and

documentation of APCD approval of alternative CMPs. Records shall be 

maintained for two years after the date of each entry and shall be provided to the 

APCD upon request.