ML11166A265

Environmental Engineering Procedure - Storm Water Management

ML11166A265
Person / Time
Site:	Diablo Canyon
Issue date:	10/21/2008
From:	Pacific Gas & Electric Co
To:	Office of Nuclear Reactor Regulation
References
DCL-10-083 ENV.SW1, Rev. 0
Download: ML11166A265 (19)

Text

I,

• • • ISSUED FOR USE BY:

DATE:

EXPIRES:

DIABLO CANYON POWER PLANT 1 &2 ENV.SW1 ENVIRONMENTAL ENGINEERING PROCEDURE U

Rev. 0 Page 1 of 19 Storm Water Management 10/21/08 Effective Date QUALITY RELATED REFERENCE USE Table of Contents

1.

S C O P E....................................................................................................

.. 1

2.

D IS C U S S IO N...........................................................................................

.. 2

3.

R ES PO N S IBILITIES.................................................................................

3

4.

P R E R EQ U IS IT ES......................................................................................

3

5.

PRECAUTIONS AND LIMITATIONS..........................................................

3

6.

A P PA R A T U S...........................................................................................

.. 4

7.

R EA G E N T S.............................................................................................

.. 4

8.

IN ST R U C T IO N S........................................................................................

5 8.1 Contract Lab Analysis Requirements..........................................................

5 8.2 Sample Container Management..................................................................

5 8.3 Conducting Quarterly Observations..........................................................

5 8.4 Conducting Annual Site Inspection.............................................................

5 8.5 Conducting Storm Water Visual Observations............................................

6 8.6 Conducting Storm Water Sampling.............................................................

7 8.7 Performing Storm Water Sampling and Visual Observations...................... 8 8.8 C ontrol of Data Sheets.............................................................................

12

9.

ACCEPTANCE CRITERIA........................................................................

13

10.

R E FE R E N C E S......................................................................................

.. 13

11.

R E C O R D S.............................................................................................

.. 13 ATTACHMENTS:

1.

40 CFR Part 136 Sample Container and Preservation Requirements.....

14

2.

Diablo Canyon Site Map with Sampling Points.........................................

15

3.

Identification of Storm Water Discharge....................................................

17

1.

SCOPE 1.1 This procedure implements the requirements contained in the DCPP SWPPP (Storm Water Pollution Prevention Plan), to include:

Sampling requirements Storm water visual observations Non-storm water observations Annual compliance inspections ENV!SWlu3r00.DOC 1007.1432

Storm Water Management ENV.SW1 RO Page 2 of 19 UNITS 1&2

2.

DISCUSSION 2.1 This procedure is intended for sectional use.

2.2 Implementation of the DCPP Industrial SWPPP was agreed upon with the Central Coast Regional Water Quality Control Board (CCRWQCB) by letter of agreement DCL-2006-556 (DCPP Storm Water Management Program - SWPPP Implementation Agreement).

2.3 This procedure does not supersede any other NPDES sampling or procedural requirement.

2.4 Minimum sample container, preservation, and storage requirements are listed in, "40 CFR Part 136 Sample Container and Preservation Requirements."

Chemistry supervision may direct using a better container based on Standard Methods or other sources.

2.5 Samples collected under this procedure are analyzed by a contract laboratory.

2.6 A site map indicating sample stream locations outside the power block (yard and storm drains) is included in Attachment 2.

2.7 Sections of this procedure providing sampling point directions are Continuous use; others are Reference use.

2.8 provides a description of all storm water discharge paths.

2.9 Experience has shown the following in regards to storm water discharge:

2.9.1 Greater than 0.07 inches of steady rainfall is needed to produce discharge.

2.9.2 Intake areas run off first. Areas above Shorecliff Road lag intake areas in runoff by 30 minutes or more, depending on rain intensity. Sampling instructions have been optimized to reflect runoff rates.

2.10 The following definitions are applicable to this procedure:

2.10.1 Authorized Non-Storm Water Discharge: Waters other than storm water which are authorized by the Diablo Canyon NPDES permit or SWPPP.

a.

Authorized non-storm water discharge may include fire hydrant flushing, potable water systems, drinking fountain water, atmospheric condensates, irrigation, landscape watering, springs, ground water, seawater infiltration.

2.10.2 Field Data Sheet: Data sheets on which data is recorded in the field. Each data sheet is unique by date as described in this procedure. Data collection will occur under adverse conditions and will not remain legible enough for long-term storage or submission to regulatory agencies. The field data sheets are not the final quality document.

ENV!SW1u3roo.DOC 1007.1432

Storm Water Management ENV.SW1 RO Page 3 of 19 UNITS 1&2 2.10.3 Final Quality Record: The final output version of the field data, verified with the field data sheet, and signed and dated by an appropriate reviewer. The final quality record allows maintaining integrity and retrievability of the record for the required period of time.

2.10.4 Forms: The California State Water Board directed forms for documenting and submitting annual reports associated with storm water.

2.10.5 Non-Authorized Storm Water Discharge: Waters other than storm water which discharge.

a.

Non-authorized storm water discharge includes rinse and/or wash water from vehicles, buildings, or pavement which are not authorized by another NPDES permit.

b.

Materials improperly disposed of, dumped, spilled, or leaked which reach waters of the State are a non-authorized storm water discharge.

2.10.6 Non-Storm Water Discharge: Any discharge to storm drainage systems that is not composed entirely of storm water.

2.10.7 Storm Water: Storm water is any storm water runoff, snow melt runoff, storm water surface runoff, and drainage.

2.10.8 Wet Season: As described by the General Storm Water Permit 97-03-DWQ, the wet season is from October 1 through May 30.

3.

RESPONSIBILITIES 3.1 Environmental Operations is responsible for coordinating and implementing this procedure.

4.

PREREQUISITES None

5.

PRECAUTIONS AND LIMITATIONS 5.1 Do NOT attempt to implement sampling or visual observations during thunderstorm activity.

5.2 Certain sampling locations described in this procedure are hazardous due to rocky or steep terrain, or deep ditches which may be slippery, especially in rainy weather. Cautions are listed before the most hazardous sample locations; however, all locations should be sampled with personal safety in mind.

5.3 IF sampling at a.hazardous location at night OR in bad weather, THEN notify a co-worker before leaving and provide an approximate return time.

ENVISW1u3rOO.DOC 1007.1432

Storm Water Management ENV.SW1 RO Page 4 of 19 UNITS 1 &2

6.

APPARATUS 6.1 REFER TO instructions for the discharge being sampled. One or more of the following may be necessary:

Sample bottle reach rod Sample pump with tubing (tubing should be new and/or cleaned appropriately for the sample to be collected)

Highly reflective rain-gear

7.

REAGENTS Nitric acid, ultrapure, concentrated Hydrochloric acid, ultrapure, concentrated Hydrochloric acid, reagent grade or ultrapure, diluted 1:1 with DI water (for O&G sample preservation)

ENV!SW1u3r00.DOC 1007.1432

Storm Water Management ENV.SW1 RO Page 5 of 19 UNITS 1 &2

8.

INSTRUCTIONS 8.1 Contract Lab Analysis Requirements 8.1.1 WHEN sending samples to an off-site laboratory, THEN complete a chain of custody form, including names, dates, and times of transfers of custody.

8.2 Sample Container Management 8.2.1 Sample containers for storm water analysis are pre-staged in storm water kits as follows:

pH, Conductivity, Dissolved Solids: non-acidified polyethylene container

" TOC: pre-acidified (HCI) glass VOC vials

" Metals: pre-acidified (nitric acid) polyethylene containers 8.2.2 IF using containers that are not pre-staged in kits, THEN follow guidance in Attachment 1, including preservation requirements.

8.3 Conducting Quarterly Observations 8.3.1 Required quarterly, with no more than 16 weeks between each observation.

8.3.2 Perform the observations only if preceded by 3 days of no discharge.

8.3.3 Perform the observations only during daylight hours.

8.3.4 Observe all storm water discharge pathways for the presence of both authorized and non-authorized discharge.

a.

REFER TO definitions in Section 2 for determining authorized and non-authorized discharge.

8.3.5 Document quarterly observations on Forms 2 and 3 of the Annual Storm Water Report.

8.4 Conducting Annual Site Inspection 8.4.1 Required annually, and within 8 to 16 months of last inspection.

8.4.2 Perform a comprehensive site inspection and record review.

8.4.3 REFER TO the DCPP SWPPP for specific requirements of this inspection and records review.

8.4.4 Document annual inspection in the Annual Storm Water Report.

ENV!SW1u3rOO.DOC 1007.1432

Storm Water Management ENV.SW1 RO Page 6 of 19 UNITS 1 &2 8.5 Conducting Storm Water Visual Observations NOTE:

Experience has shown that greater than 0.07 inches of steady rain is needed to produce discharge. Intake areas run off first. Areas of higher elevation lag intake areas by 30 minutes or more.

8.5.1 Required monthly during the wet season (Oct 1 through May 30).

8.5.2 Perform the observations only if preceded by 3 days of no discharge.

8.5.3 Perform the observations only during daylight hours.

NOTE: describes each storm water discharge location.

8.5.4 Observe all storm water discharge points within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> of discharge for the presence of pollutant characteristics:

" Odor Color

" Turbidity

" Floatables Sheen 8.5.5 IF unable to perform observation within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, THEN note reason in remarks section of data sheet.

8.5.6 Document visual observations on Form 4 of the Annual Storm Water Report.

a.

Field data sheets may be used.

ENV!SW1u3r00.DOC 1007.1432

Storm Water Management ENV.SWl RO Page 7 of 19 UNITS 1&2 8.6 Conducting Storm Water Sampling 8.6.1 Required twice during the wet season:

a.

Perform only if preceded by 3 days of no discharge.

b.

Sample the first qualifying storm event (e.g., significant runoff produced).

c.

Sample a second storm event of the wet season.

d.

IF unable to sample the first storm event of the season, THEN sample two storm events during the wet season and document reason why unable to sample the first storm event.

EXAMPLE: Based on experience, it is not uncommon for an unpredicted storm to produce 0.20 inches of rainfall or more in the middle of the night. In this case, document and sample two additional storm events.

8.6.2 All samples are required to be collected within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> of discharge.

8.6.3 IF unable to perform sample within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, THEN note reason in remarks section of data sheet.

8.6.4 Document sample collection on Form 1 of the Annual Storm Water Report.

a.

Field data sheets may be used.

ENVISW1u3rOO.DOC 1007.1432

Storm Water Management ENV.SW1 RO Page 8 of 19 UNITS 1 &2 8.7 Performinq Storm Water Samplinci and Visual Observations 8.7.1 Discharge 003 - Yard Storm Drain - (Sample and observe)

a.

Go to path 003 (north of Intake Maintenance Shop building).

b.

Perform visual observations of path.

c.

Collect required sample(s).

8.7.2 Discharge 020 - Intake Deck Areas - (Observe only)

a.

Go to 020 discharge where storm water drains to forebays through open grating.

b.

Perform visual observations of path.

8.7.3 Discharge 021 - Yard Storm Drain - (Observe only)

a.

Go to 021 discharge (east of traveling screen deck).

b.

Perform visual observations of path.

8.7.4 Discharge 018 - Yard Storm Drain - (Observe only)

a.

Go to 018 discharge, normally shut parking lot drain.

b.

Perform visual observations of path.

c.

IF drain valve is shut (normal condition),

THEN record point as no flow observed.

8.7.5 Discharge 023 - Yard Storm Drain - (Sample and observe)

__CAUTION:

Great caution is needed while observing and sampling this point on the intake road.I

a.

Go to 023 drain inlet (on intake road).

b.

Carefully remove the 023 grate.

c.

Perform visual observations of path.

d.

Collect required sample(s).

e.

Replace 023 grating.

ENV!SW1u3r00.DOC 1007.1432

Storm Water Management ENV.SW1 RO Page 9 of 19 UNITS 1 &2 8.7.6 Discharge Boat Dock - Marine Refueling Area - (Sample and observe)

a.

Perform visual observations.

b.

Before proceeding, verify there are no pollutants.

c.

Open berm drain valve.

d.

Collect required sample(s).

e.

Close berm drain valve.

8.7.7 Discharge 004 - Yard Storm Drain to Retention Basin - (Sample and observe)

NOTE 1: Unless environmental staff directs otherwise, the sample point for 004 is the inlet to 004 retention basin at concrete culvert.

NOTE 2: Depending on retention basin volume, this sample may be collected as a pre-release sample.

a.

Perform visual observations.

b.

Collect required sample(s).

8.7.8 Discharge 009 - Yard Storm Drains - (Sample and observe)

NOTE 1: Sample point 009 is under a cover in the road north of the Ul transformers that leads up to the 115' back yard. This point samples from a 20k+ gallon passive oil/water separator that is underground.

NOTE 2: The 009 sample point cover weighs -30 lbs.

a.

b.

C.

d.

e.

Perform visual observations of surrounding area.

Carefully remove the sample point cover.

Secure the sample bottle in the reach rod holder.

Collect required sample(s).

Carefully replace sample point cover.

ENV!SW1u3rOO.DOC 1007.1432

Storm Water Management ENV.SW1 RO Page 10 of 19 UNITS 1 &2 8.7.9 Discharge 005 - Yard Storm Drains - (Sample and observe)

CAUTION 1:

The culvert that feeds 005 drains a large area, including part of the ISFSI. High flows through the 10' wide by 5' high culvert are possible.

CAUTION 2:

Great caution is needed while accessing this point and sampling.

a.

Go to 005 path downstream of sediment weir.

b.

Perform visual observations.

c.

Collect required sample(s).

8.7.10 Discharge 006 - Yard Storm Drain - (Sample and observe)

CAUTION:

Great caution is needed while accessing this sample point due to slippery CAUTON:

surfaces, brush, and cliff edge.

a.

Go to 006 drainage culvert.

b.

Perform visual observations of path.

c.

Collect required sample(s).

8.7.11 Discharge 006 - Shooting Range Effluent - (Sample and observe)

a.

Go to 006 range effluent pipe (north of warehouse "B").

b.

Perform visual observations of path.

c.

Collect required sample(s).

8.7.12 Discharge 010 - Yard Storm Drain - (Observe only)

a.

Go to 010 discharge (northeast corner of Ionics makeup water facility).

b.

Perform visual observations of path.

8.7.13 Discharge 013 - Yard Storm Drains - (Sample and observe)

a.

Go to 013 sample point (south of 230 kV yard gate).

b.

Perform visual observations of path.

c.

Collect required sample(s) using a sample reach rod, if necessary ENV!SW1u3rOO.DOC 1007.1432

Storm Water Management ENV.SW1 RO Page 11 of 19 UNITS 1&2 8.7.14 Discharge 014 -.Storm Water Runoff - (Observe only)

a.

Go to 014 drainage path (adjacent to old steam generator storage building).

b.

Perform visual observations of path.

8.7.15 Discharge 015 - Yard Storm Drains - (Sample and observe)

a.

Go to 015 path (northeast corner of Building 604 adjacent to the NPG garage).

b.

Perform visual observations of path.

c.

Collect required sample(s).

8.7.16 Discharge 011 - Yard Storm Drain - (Sample and observe)

CAUTION:

Great caution is needed while parking on Diablo Creek Road and accessing this roadside drop-in culvert.

I

a.

Use emergency vehicle flashers and the 2 minute rule. Don highly reflective clothing.

b.

Go to 011 discharge path (on Diablo Creek Road).

c.

Perform visual observations of path.

d.

Collect required sample(s).

8.7.17 Discharge 008 - Yard Storm Drains - (Sample and observe)

NOTE:

Unless environmental directs otherwise, the sample point for 008 receives storm water from the northwest part of the plant outside the PA, adjacent roadways, and watersheds. The sample point is at a pipe drain off the west side of the road where Wayside Drive intersects Shorecliff Road above Diablo Creek.

a.

Notify security (x3330) before accessing this point.

b.

Go to 008 path.

c.

Perform visual observations of path.

d.

Collect required sample(s).

e.

Notify security (x3330) after sampling has been completed.

ENV!SW1u3r00.DOC 1007,1432

Storm Water Management ENV.SW1 RO Page 12 of 19 UNITS 1 &2 8.7.18 Discharge 012 - Yard Storm Drain - (Observe only)

CAUTION:

Tri-Bar flats may be extremely muddy and difficult for vehicle traffic.

a.

Carefully assess the road conditions before proceeding into Tri-Bar flats.

b.

Perform visual observations of path leading to 012 vertical drain pipe to Diablo Creek.

c.

IF light rain conditions, THEN no flow may be present; record point as no flow observed.

8.7.19 Discharge 007 - Storm Water Runoff - (Observe only)

NOTE:

Discharge 007 drains watershed east of the owner controlled area. Path 007 will only flow under very heavy rain conditions. Observation point for 007 is located in culvert directly north of outdoor abrasive blast apron.

a.

Perform visual observation of path.

b.

IF no flow (highly likely),

THEN record point as no flow observed.

8.7.20 Non-Routine Discharges

a.

Non-routine discharges generally occur in one of two types:

Discharges that occur through pathways other than those listed previously.

Discharges that occur from a listed pathway, but must be analyzed for a different parameter or a different chemical matrix than expected.

b.

Contact environmental staff to request guidance on collection and preparation of non-routine samples for analysis.

8.8 Control of Data Sheets 8.8.1 The final quality record for storm water data is the State Water Board directed format for each individual year. The State Forms may change annually and the reporting facility is obligated to complete forms as provided.

8.8.2 Field data sheets shall be controlled in a manner to protect their integrity until data is transcribed, verified, and signed as the final quality record.

ENV!SWlu3r00.DOC 1007.1432

Storm Water Management ENV.SW1 RO Page 13 of 19 UNITS 1 &2

9.

ACCEPTANCE CRITERIA None

10.

REFERENCES 10.1 CAP E-7, "NPDES Sampling" 10.2 CAP Q-1, "Chemical Laboratory Quality Control" 10.3 CYI.DC1, "Analytical Data Processing Responsibilities" 10.4 OPI.DC23, "Control of Posted Plant Signs and Information" 10.5 State Water Resources Control Board, Water Quality Order No. 97-03-DWQ, National Pollutant Discharge Elimination System (NPDES) General Permit No. CAS000001. Waste Discharge Requirements for Discharges of Storm Water Associated with Industrial Activities Excluding Construction Activities.

10.6 Amended Order No. 90-09, NPDES No. CA0003751, Waste Discharge Requirements for Pacific Gas and Electric Company, Diablo Canyon Power Plant, Units 1 and 2, San Luis Obispo County, May 11, 1990 10.7 Company Letter DCL-2006-556, Agreement with Central Coast Regional Water Quality Control Board for implementation of General Permit associated with discharge of storm water

11.

RECORDS 11.1 Submit records to the Records Management System (RMS) PER CY1.DC1.

ENV!SW1 u3r00.DOC 1007.1432

ENV.SWl RO Page 14 of 19 U 1 &2 Attachment 1: Page 1 of 1 40 CFR Part 136 Sample Container and Preservation Requirements PARAMETER CONTAINER (N1)

PRESERVATIVE (N2)

MAXIMUM (N3) HOLDING TIME Ammonia as N P, G Cool, 0-6"C, 28 days H 2SO 4 to pH<2 Boron P, G HNO 3 to pH<2 6 months Cyanide P, G Cool, 0-6C, 14 days (N5)

NaOH to pH>12, 0.6g ascorbic acid (N4)

Fecal enterococcus and P, G Cool, 0-6"C, 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> total coliform 0.008% Na2S20 3 (N4)

Grease and Oil (TOC)

G Cool, 0-61C, 28 days 1:1 HCI to pH<2 (N8)

Hydrazine P, G Cool, 0-6"C, HCI to pH<2 28 days Kjeldahl Nitrogen P, G Cool, 0-6"C, 28 days H 2SO4 to pH<2 Mercury P, G HNO 3 to pH<2 90 days (N10)

Metals (N6)

P, G HNO 3 to pH<2 (N9) 6 months or at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to analysis Nitrate as N P, G Cool, 0-6'C, 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> pH P, G None required 15 minutes Phenolic Cpds., Chlorinated G, Teflon-lined cap Cool, 0-61C, 7 days until extraction, or Nonchlorinated 0.008% Na2S20 3 (N4) 40 days after extraction Phosphorus (Total)

P, G Cool, 0-61C, 28 days H2 SO 4 to pH < 2 Polychlorinated Biphenyls G, Teflon-lined cap Cool, 0-6"C 7 days until extraction, 40 days after extraction Settleable Solid P, G Cool, 0-6C 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> Suspended Solids P, G Cool, 0-6C (N11) 15 minutes without refrigeration, 7 days with refrigeration Total Residual Chlorine P, G (dark)

Not required 15 minutes Toxicity, acute (N7)

P Cool, 0-6C 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Toxicity, chronic (N7)

P Cool, 0-61C 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> NOTE 1:

P= Polyethylene G= Glass NOTE 2:

Sample preservation should be performed immediately upon sample collection. For composite chemical samples, each aliquot should be preserved at the time of collection. Chemical samples may be preserved by maintaining at 0-61C until composting and sample splitting is completed.

NOTE 3:

Samples should be analyzed as soon as possible after collection. The times listed are the maximum times that samples may be held before analysis and still be considered valid.

NOTE 4:

Should only be used in the presence of residual chlorine.

NOTE 5:

Maximum holding time is 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> when sulfide is present. Optionally, samples may be tested with lead acetate paper before pH adjustments in order to determine if sulfide is present. If sulfide is present, it can be removed by the addition of cadmium nitrate powder until a negative spot test is obtained. The sample is filtered and then NaOH is added to pH 12.

NOTE 6:

This category includes the following metals: Al, Sb, As, Ba, Be, B, Cd, Ca, Cr (Total), Co, Cu, Au, Ir, Fe, Pb, Li, Mg, Mn, Mo, Ni, Os, Pd, Pt, K, Rh, Ru, Se, Ag, Na, TI, Sn, Ti, V, and Zn.

NOTE 7:

Toxicity sample requirements have been transcribed from EPA/600/R-95/136; "Short-Term Methods for Estimating the Chronic Toxicity of Effluent and Receiving Waters to West Coast Marine and Estuarine Organisms." They are included in Attachment 1 for convenience.

NOTE 8:

6N hydrochloric acid is equivalent to 1:1 hydrochloric acid.

NOTE 9:

Diablo Canyon has received site-specific approval to use microwave digestion for preparation of samples for ICP silver analysis. Terms of this approval requires use of 4+1 HNO3/HCI for the digestion.

NOTE 10: Site-specific permission for 90-day maximum hold time of samples for mercury has been granted by CCRWQCB.

NOTE 11: TSS sample refrigeration is required if analysis is not begun at or within 15 minutes of collection.

ENV!SW1u3r00.DOC 1007.1432

ENV.SW1 RO Page 15 of 19 U1 &2 Attachment 2: Page 1 of 2 Diablo Canyon Site Map with Sampling Points a

DIABLO COVE ENV!SWlu3rOO.DOC 1007.1432

ENV.SW1 RO Page 16 of 19 Diablo Canyon Site Map with Sampling Points U 1 &2 Attachment 2: Page 2 of 2 TRANSMIS' ION LINES AND TOWERS SITE OVERLOOK ENV!SWlu3rOO.DOC 1007.1432

ENV.SW1 RO Page 17 of 19 Identification of Storm Water Discharge U 1 &2 Attachment 3: Page 1 of 3

1.

Boat - Marine Refueling Facility Runoff

a.

==

Description:==

Storm water generated near and around the marine refueling facility.

b.

Sampled: Yes

2.

003 - Yard Storm Drain

a.

==

Description:==

Storm water runoff from areas surrounding the seawater intake structure building.

b.

Sampled: Yes

3.

004 - Yard Storm Drain to Retention Basin

a.

==

Description:==

Storm water drains to discharge 004 from the following areas on site:

Southeast side of the Unit 2 Turbine Building Administration Building Security Building Training and Maintenance Shop Buildings Parking lots 4 and 5 Meteorological tower area A small area to the west side of the west plant access road Hazardous Waste Storage Unit Firewater storage tank Truck bay Firewater pump building

b.

Sampled: Yes

4.

005 - Yard Storm Drain

a.

==

Description:==

Storm Water drains to discharge 005 from the following areas on site:

Plant yard on the Unit 2 side of Radioactive Waste Building West side of the Turbine Building Hazardous Materials Warehouse Construction Offices Parking lots 2, 3, 6, 7, and 8 Cold Machine Shop Seawater Reverse Osmosis Facility Biological Laboratory (not in service) o Fabrication Shop

b.

Sampled: Yes ENVISW1u3r00.DOC 1007.1432

ENV.SW1 RO Page 18 of 19 Identification of Storm Water Discharge U 1 &2 Attachment 3: Page 2 of 3

5.

006 - Yard Storm Drain

a.

==

Description:==

Storm water drains to discharge 006 from the following areas on site:

Pacific Ocean side of the ridge southeast of the power plant Warehouse B Shooting Range Outdoor Abrasive Blast Facility Fleet Vehicle Fueling Facility Parking Lot #1

b.

Sampled: Yes

6.

007-Storm Water Runoff

a.

==

Description:==

Storm water from watershed south and east of the facility. There are no industrial activities present in this path. Water discharges to an inaccessible rip-rap field west of the facility.

b.

Sampled: No, this point is not sampled. This point is not downstream of industrial activity and the underground conduit discharge location is not safely accessible.

7.

008 - Storm Water Runoff

a.

==

Description:==

Storm water yard drains from the following areas:

Northwest side of the Turbine Building Technical Maintenance Building Watershed on the north side of Diablo Creek to the northwest of the power plant

b.

Sampled: Yes

8.

009 - Yard Storm Drain

a.

==

Description:==

Storm water from the north and northeast side of the Unit 1 Auxiliary, Containment, Fuel Handling, and Turbine Buildings drains to the north side of the yard to discharge.

b.

Sampled: Yes

9.

010 - Yard Storm Drain

a.

==

Description:==

Runoff from the hillside between DCPP and the Raw Water Reservoirs drains into a concrete culvert that is routed to the north along steep inaccessible terrain prior to discharge.

b.

Sampled: No, this point is not sampled. Storm water collected from discharge 013 is substantially identical to this discharge point.

10. 011 - Yard Storm Drain

a.

==

Description:==

Runoff from Diablo Creek Road and the north sides of the 230 kV and 500 kV switch yards.

b.

Sampled: Yes ENV!SW1 u3r00.DOC 1007.1432

ENV.SW1 RO Page 19 of 19 Identification of Storm Water Discharge U 1 &2 Attachment 3: Page 3 of 3

11. 012 - Yard Storm Drain

a.

==

Description:==

Runoff from the area between the 230 kV switchyard and the 500 kV switchyard drains to a vertical shaft leading to an underground culvert and discharge.

b.

Sampled: No, this point is not sampled. Storm water sampled from discharge 011 and 013 are substantially identical to this discharge point.

12. 013 - Yard Storm Drain

a.

==

Description:==

Storm water drains to 013 from the following areas:

Raw Water Reservoirs Makeup Water Treatment Facility 230 kV switchyard

b.

Sampled: Yes

13. 014 - Storm Water Runoff

a.

==

Description:==

Storm water runoff from lay down areas and the hillside south and east of the 500 kV switchyard is collected in a drainage ditch and routed to discharge.

b.

Sampled: No, this point is not sampled. Storm water sampled from discharge points 013 and 015 are substantially identical to this discharge point.

14. 015 - Yard Storm Drain

a.

==

Description:==

Storm water runoff from the area around the temporary auto facilities and adjacent roadway is collected in a drainage ditch and discharged.

b.

Sampled: Yes.

15. 018 - Yard Storm Drain

a.

==

Description:==

Storm water runoff from the east side of the Intake Structure Building.

b.

Sampled: No, this point is not sampled. Storm water sampled from discharge points 003 and 023 are substantially identical to this discharge point.

16. 020 - Intake Deck Storm Drain

a.

==

Description:==

Storm water collected directly in front of the seawater traveling screen housings drains to the circulating water pump fore bays through open gratings.

b.

Sampled: No, this point is not sampled. Storm water sampled from discharge points 003 and 023 are substantially identical to this discharge point.

17. 021 - Yard Storm Drain

a.

==

Description:==

Screen wash over spray drains and storm water from the east side of the traveling screen deck.

b.

Sampled: No, this point is not sampled. Storm water sampled from discharge points 003 and 023 are substantially identical to this discharge point.

18. 023 - Yard Storm Drain

a.

==

Description:==

Storm water generated on the north and east sides of Intake Structure Building and intake roadways is drained through discharge point 023.

b.

Sampled: Yes ENV!SW1u3rOO.DOC 1007.1432