Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before...

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Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner or operator thereof shall file with the department a bond… conditioned that the operator shall faithfully perform all of the drilling, water supply replacement, restoration and plugging requirements (4 pages) Chapter 78.301 Scope In addition to the requirements of section 215 of the act (58 P. S. § 601.215), this subchapter specifies certain requirements for surety bonds, collateral bonds, replacement of existing bonds, maintaining adequate bond and bond forfeiture.(9 pages)

Transcript of Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before...

Page 1: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Bonding

• ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before

continuing to operate any oil or gas well, the owner or operator thereof shall file with the department a bond… conditioned that the operator shall faithfully perform all of the drilling, water supply replacement, restoration and plugging requirements (4 pages)

Chapter 78.301 ScopeIn addition to the requirements of section 215 of the act (58 P. S. §  601.215), this subchapter specifies certain requirements for surety bonds, collateral bonds, replacement of existing bonds, maintaining adequate bond and bond forfeiture.(9 pages)

Page 2: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

More Bonding

• Guidelines for Submitting Oil and Gas Well Bonds- (64 pages) 77 pages of…

• single well bond $2,500…multiple bonded…blanket bond $25,000…acceptable bond -- surety or collateral… attorney-in-fact…Collateral…cash…certified check…bank check…treasurer’s check…money order…payable to the Commonwealth…letter of credit…certificate of deposit…negotiable securities…does not pay interest on cash held as collateral...collateral bond requirements…phased deposits of collateral…individuals…not to corporations, companies, or partnerships.

• Plan on 2 weeks to 3 months for Bond approvals

• A well will be released from bond coverage one year after it has been properly plugged and the site satisfactorily restored.

Page 3: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Permit Application For Drilling Or Altering A Well

• Act 223 - Sec.201(a) No person shall drill a well or alter any existing well…without having first obtained a well permit.

• § 78.11. Permit requirements. (a)  No person may drill or alter a well

unless that person has first obtained a permit from the Department.

(b)  No person may operate a well unless one of the following conditions has been met:

(1)  The person has obtained a permit under the act.

(2)  The person has registered the well under the act

(3)  The well was in operation on April 18, 1985, under a permit that was obtained under the Gas Operations Well-Drilling Petroleum and Coal Mining Act

Page 4: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.
Page 7: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Staff to handle paperwork- NWRO

7 Clerical for administration-logging, tracking,

issuing

7+ Technical staff for technical review

-plats, deviation surveys, environmental issues, notifications

1 Program Manager to sign every permit

Page 9: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

How do we keep track

• By adding Numbers to the application– To each application we add the following numbers:

OGO number Bond number

API number Authorization number Site number Client number APS number

Account number Primary Facility number Sub-facility number

Sometimes more numbers

Page 11: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Form 5500-PM-OG0001

• § 78.15. Application requirements

(a)  An application for a well permit shall be submitted on forms furnished by the Department and contain the information required by the Department to evaluate the application.

(b)  The permit application will not be considered complete until the applicant submits a complete and accurate plat, an approvable bond or other security, the fee, proof of notification, necessary requests for variance or waivers or other documents required to be furnished by law or the Department. The person named in the permit shall be the same person named in the bond or other security.

Page 12: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.
Page 13: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.
Page 14: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.
Page 15: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.
Page 16: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.
Page 17: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.
Page 18: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.
Page 19: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.
Page 20: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.
Page 21: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Completing the Drilling Application Form

Administration stuffName Address Phone Fax Well Name & Number County Muni

Was location ever permitted before? ###-#####Is this re-working an existing well not registered or permitted?Please provide all known information about the unregistered/ un-permitted well.

Pennsylvania Natural Diversity Inventory…any “hits” must be addressed and mitigation standards might be included as a Special Condition on the Permit.

Page 22: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Permit Types

Drill a new well

Deepen a well

Re-drill a well

Alter a well

Other

Page 23: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Drill a New Well

• A location where a well has never been drilled

location may have been permitted before

Page 24: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Deepen a Well

• To drill an existing well to lengthen the well bore

Page 25: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Re-drill a Well

• Drill through a well plug to put well in production

Plugged Well

Drill through

Page 26: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Alter a Well

• Changes the well bore or drills out well bore

Drill out well bore

Original well bore

Drilled out larger well bore

Page 27: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

…Alter a well…casing

• In coal areas…any work that effects the coal protective casing…requires a permit

• Work or replacement of casing that changes casing depth or diameter…requires a permit

• Work or replacement of casing of the same diameter to the same depth does not, by itself, require a permit.

Page 28: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Other type ?

• If not a new, deepen, re-drill or alteration…it is an “other” well…and must be specified

Change use from production to storage Rehabilitate an Orphan well for production

Replacement of casing.No re-drill of borehole.

No re-drill of borehole.

DEP is nolonger ableto register wells

Page 35: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Oil & Gas Conservation Law

• If well is 3800’ or deeper & penetrates the Onondaga…then Conservation Well.

Depth

Onondaga5000 -

6000-

Depth

3000-

4000-

3800-

Onondaga

Page 36: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

What about these?

DEP policy: Proposed vertical wells with a non-vertical lateral, where the vertical portion penetrates the Onondaga by 200’ or less, and the intent of that portion is only for logging purposes, can be considered non-conservation wells.

Onondaga6000-

6200<200’

>200’

For production purposes

Page 37: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

In areas with no spacing application or order, the borehole, at Conservation depth, must be at least 330’

from outside lease boundary.

Onondaga6000-

6100

330’ 330’ 330’ 330’

Page 39: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Workable Coal Seams by underground methods

• Coal 28” thick with sufficient quality• At least 100’ overburden• …………………………….for at least 1 sq mi aerial extent

28”

Surface

100’28” sufficient quality100’ overburdenAerial extent at least 1 mile

Page 40: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

If determined a workable coal seam and well is not exempted from the Act and not a Conservation Well

Distance restrictions:At least 1000’ from any other well that

-penetrates a workable coal seam-has not been plugged-is non-producing wells abandoned after 11/30/55

1000’1000’

Proposedlocation

workable coal seam

Plugged well

Non producers abandoned

After 11/30/55Before 11/30/55

Conservation well

Non-Conservation well

Page 41: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

House Bill 265

• House Bill 265 looks to amend the Coal and Gas Resource Coordination Act.

• Allowing Non-Conservation well clusters, on the same pad, to be located less than 1000’ feet from each other…among other things.

Page 44: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Coordination with gas storage operations

• Proposing to drill within 2000’ of a gas storage reservoir. Storage operator must be notified with the casing and cementing plan.

The storage operator can object

DEP will mediate a conference between the 2 parties to work out an agreement

Page 46: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Distance restrictions

• The proposed site must be > 100’ from any stream, spring, body of water, or a wetland > 1 acre, unless approved through a waiver.

Well pad/site

100’

100’

100’

Page 47: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Waiver request – Form 5500-FM-OG0057

• Requesting to waive the 100’ distance restriction from any wetland > 1 acre, spring, stream or body of water

Describe the waiver request in detail……water bodies, classifications, distances, etc..

…addressing all of the following:(1) Fluid containment measures (drilling, stimulation, formation & production)(2) Handling large volume of top-hole water(3) Site chemical storage & handling…spill clean-up(4) Disposal methods for wastes and waste fluids (cuttings & muds)(5) When polluting substances will be removed from site after well completion(6) Waste removal during inclement weather(7) Submittal of an E & S Control Plan per Chapter 102

Page 49: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

…more distance restrictions• A new well may not be drilled within 200’ of existing buildings

(where someone normally works or lives), or a water well…

>200’

…without prior written consent from the owner…

…or an approved request for variance Form 5500-FM-OG0058

Page 50: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Request for Variance From Distance RestrictionFrom Existing Building or Water Supply (5500-FM-OG0058)

Explain the variance request:

-distances from the proposed well location to buildings and / or water supply;-uses of buildings and water supplies, and frequency of use;-proof of notification-type of insurance coverage for the project-explain how adherance to the 200-ft requirement would deprive the oil and gas owner of the opportunity to produce or share in the production of oil and gas underlying the surface tract-evidence that no location more than 200 feet from all buildings or water supplies is available

where the well could be drilled.• Plan Description. Describe measures, facilities, or practices to be employed during well site construction, drilling, and

well operation to insure safety and protect persons and property, and to protect waters of the Commonwealth. Use additional blank sheets for narrative or sketches as needed

Define:Insurancecoverage

How you’redeprived

Project

Safetymeasures

Page 51: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Coordination with Public Resources• “Section 205(c) of the Oil and Gas Act requires the Department to consider the

impact of the proposed well on public resources, including: publicly owned parks, forest, gamelands and wildlife areas; national or state scenic rivers; national natural landmarks; habitats of rare and endangered flora and fauna and other critical communities; historical and archaeological sites listed on the federal or state list of historic places”

ParksGamelands

ForestsWildlife Areas

We treat different public resources differently…

Endangered species

The operator must fill out form 5500-PM-OG0076 if on or near public resources.

Page 52: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Coordination of a well Location with Public Resources - form 5500-PM-OG0076

• Is proposed location in or within 200’ of a publicly owned park/forest/etc., Natural National Landmarks or historical/archaeological sites?

• Within a corridor of a scenic river?

• Has a PA Natural Diversity Inventory search been run & issues resolved?

• What add’l measures to be taken to protect public resource.

Page 53: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Public Resource’s common issues…• Allegheny National Forest (ANF) and DCNR. DEP’s consideration is elevated

when the ANF or DCNR objects to a drilling application. DEP will hold the application until a site visit by DEP field personnel. DEP will consider the objections raised by the agency and make a determination.

ANF/DCNR objection

DEP holdsApplication until…

objection consideration, through field personnel,

make a determination

DEP continuesApplication review

Page 54: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

…more other Public Resource common issues…

• Policy for Pennsylvania Natural Diversity Index (PNDI) coordination during permit review & Evaluation: Form 400-0200-001

• The application needs to include the PNDI Project Environmental Review Receipt, obtained from www.naturalheritage.state.pa.us, with the application. There are 4 types of results:

No Impact

Potential Impact

Avoidance Measures

Conservation Measures

Page 55: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

PNDI – “Potential Impacts”• If there is a potential impact a clearance letter is required from the jurisdictional

agency, which may include measures the applicant must take to minimize impacts, DEP will include them in the permit as a Special Condition.

Measures to take

Included in permit

Page 56: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

PNDI- “Avoidance Measures”• If avoidance measures are generated the applicant needs to initial that they will

abide by the measures during the project. DEP will include these measures as Special Conditions.

Avoidance measures

Initials adherenceto…

…avoidance measures

Included in permit

Page 58: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Special Protection Watersheds• Applicant identifies if proposed application is in a HQ or EV

watershed. DEP will stamp permits and plats accordingly, if applicant does not identify watershed appropriately.

Listings for specific stream identification can be found in PA Code Chapter 93

Page 60: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Page 2 - Notifications• The applicant shall notify…:

-The surface landowner-Surface landowners whose water supplies are within 1000’ of the proposed location-Water purveyor’s whose water supplies are within 1000’ of the proposed location-Gas storage operations, with storage fields, within 2000’-Coal owner and lessee, of all underlying seams, in workable coal areas-Underground coal mine operators with mine operations within 1000’

…of their intentions to drill a well…and list them on page 2.

surface landowner

l

2000’ 1000’

ProposedGas well

Workable coal (owner/lessee)

Gas storage

Water supply

Page 61: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Notification details• The applicant shall notify appropriate parties by certified mail, with proof of notification

or, show proof of notification with appropriate signature on page 2.

The notification shall include the complete application and form 5500-FM-OG0052 Landowner Notification Of A Well Drilling Or Alterations, if applicable

Rights under the law

Certified mail

Signature on page 2

Signature also waives the 15 day objection period

Page 62: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Notification- Water Supply Protection

• Form OG0052 Landowner Notification Of Well Drilling Or Alterations informs the water supply of their rights under Section 208 of the Act.

Operators who pollute or diminish a water supply shall restore or replace the supply, adequate in quality/quantity for purposes served.

Operators are presumed responsible for polluting or diminishing affected water supplies within 1000’ of the drilling, if the supply became affected during drilling or within 6 months of completion of the drilling or alteration.

< 6 months< 1000’ Bad Water

Page 63: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Operator is presumed guilty, unless…

• He rebuts the presumption by proving either:

– 1) Pollution was pre-existing (pre-drilling survey)

– 2) The water supply refused access for pre-drilling survey

– 3) The water supply is > 1000’ from the drilling

– 4) The water supply became affect >6 months after well completion

– 5) The water supply became affected by some other cause

Page 65: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

DEP responds to objections from surface landowners whose water supplies are within 1000’- even if it is not

afforded to them in law or regulation.

• DEP responds to written objections with a letter stating receipt of the objection and that DEP will contact them, during the review, if the application comes in.

DEP sends acknowledgementletter

Application arrives

DEP calls objecting party

Page 66: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

DEP’s objection responseMost objections are from water supplies that are not the surface

landowner of where the well is being drilled.

DEP re-informs the objecting party that there are casing standards in regulation for groundwater protection, as well as remedies afforded water supplies that are affected by drilling.

DEP will inform the objecting party of the applicant’s rights to a permit within 45 days as long as:1) The well site is not in violation, or be in violation when permit is issued2) The application is complete and accurate3) There are no unresolved objections by coal mine owner/operator4) Bonding requirements have been met5) The applicant is not under a legal document from DEP which restricts it’s issuance

Page 68: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Plat requirements• Prepared by registered professional Engineer or Surveyor with seal (4 copies)

• Show:

Municipality & County

Surface Landowner

Surface landowner water supplies of water supplies within 1000’ of proposed location.

Owner of workable coal seams

Tract Acreage

Proposed location surveyed from at least 2 permanent points on tract boundary

Proposed well angle and direction

Well number

Workable coal seams cased off

Latitude and longitude of surface location-10 meter accuracy (NAD 83)

All buildings and water supplies within 200’ of proposed location

Water supplies within 1000’ of proposed location

Wetlands within 100’ of proposed location

Every spring, stream or body of water within 100’ of disturbed area

USGS topographic map name & section number with topographic mark and offsets

Applicable metadata- 10 meter accuracy

Target formation

Well name, number, type, permit number & project number if applicable

Well Deviations and distances with total vertical depth and total measured depth

Well graphic display from plan view

Page 69: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Typical plat – top half

Page 70: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Typical plat

Typical Plat- bottom half

Page 71: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Deviation Survey

Page 72: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

“The Department

shallissue

apermitwithin

45days”

Page 73: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Chapter 78 update. 78.52(d) requires the submittal of all predrill data to be used by an Operator to preserve their defense under section 208(d)(1) within 10 business days of

receipt of such data. DEP is requesting your assistance and cooperation. We ask that you please submit your pre-drill data in the following method and format to:

Please submit all data electronically on a CD with a cover letter to the appropriate regional office:

Predrill Data, Oil and Gas Management ProgramNorthwest Regional Office230 Chestnut St.Meadville, PA 16335 or

NCRO Predrill DataOil and Gas Management ProgramNorthcentral Regional Office208 West Third Street, Suite 101Williamsport, PA 17701 or

Predrill Data, Oil and Gas Management ProgramSouthwest Regional Office400 Waterfront DrivePittsburgh, PA 15222-4024

Page 74: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

2.) All data should be submitted in .pdf form.

3.) The CD cover should clearly list the following:Company NameWell Farm Name (Pad) and Permit Number(s) (if available)County of Well Pad(s), Municipality of Well Pad(s)

4.) Folders should be created within the CD using the following file structure:Well Farm Name/Pad IDCounty of Sampling Location, Municipality of Sampling LocationSample ID

Example (each line is a separate folder)Smith Well PadClairon CountyKnox TownshipJohn Smith Residence

please include latitude/longitude of water sample location somewhere on the data sheet

Page 76: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Special Condition on Permit

• For shale formations with a significant horizontal well bore through the formation…

• “The permittee shall not withdraw or use water from water sources within the Commonwealth of Pennsylvania, for well fracing activities, unless the permittee does so in accordance with a Water Management plan approved by the Department.”

Page 77: Bonding ACT 223 - Sec. 215 Bonding (a)(1)…upon filing an application for a well permit and before continuing to operate any oil or gas well, the owner.

Water Management Plan

An Oil & Gas operator’s plans to withdraw from a source. The plan includes calculations and analysis of the environmental impacts associated with the withdrawal.

DEP will review the plan’s analysis of the environmental impact and, if in agreement, send an approval letter stating concurrence with the conclusions determined by the operator.