Northeast Utilities System Robert E. Carberry, P.E. Project ...taken with an EMDEX II meter manufactured by Enertech Consultants, Campbell, CA. This meter and its accessories meet

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December 19, 2013 Robert Stein, Chairman Connecticut Siting Council Ten Franklin Square New Britain, CT 06051 RE: Dockets 370A and 370A-MR Post-construction EMF Monitoring Report Greater Springfield Reliability Project (“GSRP” and Manchester to Meekville Junction Project (“MMP”) Dear Chairman Stein:

In accordance with condition 3(i) in the March 16, 2010 Decision and Order of the Connecticut Siting Council (“Council”) in Docket 370A, condition 2(i) in the July 20, 2010 Decision and Order of the Council in Docket 370A-MR, and the Council’s subsequent D&M Plan approvals in each Docket, The Connecticut Light and Power Company (“Company”) submitted a Post-construction EMF Monitoring Plan (“Plan”) on July 21, 2011, which the Council approved on August 11, 2011. The planned electric and magnetic field (“EMF”) measurements have since been completed, and this letter provides a report per Section V of the Plan.

The GSRP 345-kV line (circuit # 3216) entered service on March 5, 2013 and the new MMP 345-kV line (circuit # 3557) entered service on September 28, 2012. The post-construction field measurements were performed on dates in August, November and December, 2013 by Mr. Christopher Soderman, a Senior Engineer at the Northeast Utilities Service Company. Mr. Soderman’s measurements of electric and magnetic fields were taken in accordance with IEEE Standard 644-1994 (R2008), Standard Procedures for Measurement of Power Frequency Electric and Magnetic Fields from AC Power Lines. The measurements were taken with an EMDEX II meter manufactured by Enertech Consultants, Campbell, CA. This meter and its accessories meet the associated instrumentation standards. The meter was last calibrated on December 28, 2012 by the manufacturer using methods like those described in IEEE Standard 644- 1994(R2008).

Northeast Utilities System

107 Selden St, Berlin, CT 06037 Robert E. Carberry, P.E. Project Manager NEEWS Projects Northeast Utilities Service Company P.O. Box 270 Hartford, CT 06141-0270 (860)-665-5000

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The EMF monitoring locations specified in the Plan are shown below in Table 1, and

aerial photographs are attached to this report marking each measurement location.1

Table 1

SiteCross Section

#Municipality

Project Portion

Location

1 1 Bloomfield GSRPOff of Tunxis Ave, CT Route 189

2 1 East Granby GSRP South of Holcomb St3 2 East Granby GSRP South of Turkey Hills Rd

4 2 Split-Phase East Granby GSRPBeyond the End of Copper Hill Terrace

5 2 Suffield GSRP Field East of Ratley Rd6 23 Manchester MMP South of Tolland 7 24 Manchester MMP Meekville Jct Location

At each of the seven sites, field measurements were made beneath and to each side of the transmission line on the right-of-way. In some locations, however, vegetation made measurements away from the transmission line not practical. In addition to taking EF and MF measurements twice at each of the seven sites, magnetic fields were also measured once around the perimeter of the North Bloomfield Substation.

RESULTS FOR GSRP Electric and/or magnetic fields were measured at the GSRP sites 1 through 5 on August

22, 2013, November 26, 2013 and on December 12, 2013. The current flows over each transmission line when magnetic fields were measured at each of the five sites, as recorded by the CONVEX SCADA system, are listed in Table 2 for August 22, 2013 and Table 3 for November 26, 2013. In these tables circuit 3216 is the new 345-kV line, and circuit 1768 is the modified 115-kV line north of Granby Junction.

1 Note on the aerial photographs that Site 1 off of Tunxis Avenue, Bloomfield was relocated to a structure work pad as the side slope at the planned location would make measurements not representative of level terrain as shown to the Council in previous calculations. Also, Site 2 south of Holcomb Street, East Granby was found to have interfering vegetation growth at the time of the measurements, so this site was moved to a location to the north of Holcomb Street.

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Table 2

Site # Town Circuit # Current Circuit # Current

1 East Granby 3216 458 ‐‐ ‐‐

2 East Granby 3216 340 ‐‐ ‐‐

3 East Granby 3216 477 1768 84

4 East Granby 3216 466 1768 68

5 Suffield 3216 503 1768 106 Current Flows on GSRP Transmission Circuits on August 22, 2013

Table 3

Site # Town Circuit # Current Circuit # Current

1 East Granby 3216 147 ‐‐ ‐‐

2 East Granby 3216 206 ‐‐ ‐‐

3 East Granby 3216 161 1768 95

4 East Granby 3216 238 1768 88

5 Suffield 3216 239 1768 89 Current Flows in GSRP Transmission Circuits on November 26, 2013

Graphs of the measured electric and magnetic fields can be found in Figures 1 through 20

included with this report. Figures 1 through 8 and 13 through 16 also include a graph of calculated field values for sites 1, 2 and 4. These sites were selected as the “true-up locations, so the calculated values reflect not-only the recorded line currents at the time of the measurements but also actual conductor heights at the measurement location. The recorded line currents on August 22 and August 26, 2013 were all less than the currents used for the Annual Average Load case modeling in the Docket 370A record, and the conductor heights at each site were higher as compared to those assumed for the modeling in the Docket 370A record.

Figure 21 provides a record of the measured magnetic fields on August 22, 2013 around

the perimeter fence of North Bloomfield Substation. As expected, the fields at the substation fenceline were highest underneath the transmission and distribution lines as they exit the substation.

RESULTS FOR MMP

Electric and/or magnetic fields were measured at sites 6 and 7 on November 23, 2013, November 26, 2013 and on December 12, 2013. The current flows over each transmission line when magnetic fields were measured at each of the two sites, as recorded by the CONVEX SCADA system, are listed in Table 4 for November 23, 2013 and Table 5 for November 26, 2013. Circuits 3642 and 3557 are the pre-existing and the new 345-kV lines respectively, and circuits 1763, 1310 and 1448 are the pre-existing 115-kV lines.

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Table 4 Site # Town Ckt # Current Ckt # Current Ckt # Current Ckt # Current Ckt # Current

6 Manchester 3642 127 3557 408 1763 157 1310 120 1448 190

7 Manchester 3642 138 3557 297 1763 149 1310 111 1448 182 Current in MMP Transmission Circuits on November 23, 2013

Table 5 Site # Town Ckt # Current Ckt # Current Ckt # Current Ckt # Current Ckt # Current

6 Manchester 3642 556 3557 367 1763 166 1310 136 1448 289

7 Manchester 3642 559 3557 376 1763 169 1310 137 1448 263 Current Flows in MMP Transmission Circuits on November 26, 2013

Graphs of the measured electric and magnetic fields can be found in Figures 22 through 29. The recorded line currents on November 23 and 26, 2013 were all less than the currents used for the Annual Average Load case modeling in the Docket 370A record, and the conductor heights at each site were higher as compared to those assumed for the modeling in the Docket 370A record.

The following Table 6 lists the conductor sizes for the GSRP and MMP transmission circuits at each measurement site.

Table 4

Circuit Sites Conductor Size Conductor Type

3216 1, 2, 3, 5 2‐1590 kcmil ACSS

3216 4 4‐1590 kcmil† ACSS

1768 3, 4, 5 2‐556 kcmil ACSS

3462 6 2156 kcmil ACSR

3462 7 4‐1590 kcmil† ACSR

3557 6, 7 2‐1590 kcmil ACSS

1310 6, 7 795 kcmil ACSR

1763 6, 7 795 kcmil ACSR

1448 6, 7 1272 kcmil ACSR

† Split Phase Sections

Should any Council or staff member have any questions about this report, please contact me at (860) 665-6774.

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Figure1–MagneticFieldMeasurementsatSite#1onAugust22,2013

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Figure2–ElectricFieldMeasurementsatSite#1onAugust22,2013

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Figure3–MagneticFieldMeasurementsatSite#1onNovember26,2013

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Figure4–ElectricFieldMeasurementsatSite#1onDecember12,2013

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Figure21–MagneticFieldMeasurementsAlongtheFenceatNorthBloomfieldSubstationonAugust22,2013

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Manchester to Meekville Junction Project

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EMF Monitoring MapsOctober 17, 2011

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Sheet 1 of 1.

Documents

Northeast Utilities System Robert E. Carberry, P.E. Project ...taken with an EMDEX II meter manufactured by Enertech Consultants, Campbell, CA. This meter and its accessories meet