Memorandum

GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERS

2269 Massachusetts Avenue

Cambridge, Massachusetts 02140

(617) 868-1420

Page 1 of 1

Date:

September 2, 2020

Recipient: Town of Arlington

HMFH Architects, Inc. Attention:

Ms. Lori Cowles

Sender: William J. Burns, L.S.P.

Project: Arlington High School, Arlington (Project site)

Project No: 6531.9.T18

Subject:

Summary of Dust Monitoring

(June 3 through August 31, 2020)

In order to prevent exposures to the general public, on-site monitoring of dust levels in the

ambient air during construction has been performed by McPhail Associates, LLC. The

environmental monitoring is being performed in accordance with the Release Abatement

Measure (RAM) Plan that was prepared for the project site and submitted to the DEP on

June 2, 2020. The RAM Plan has established levels for dust at which mitigation measures

will be necessary to prevent off-site exposure risks. The action level for dust that has been

established for the project site is 0.15 mg/m3 sustained over a 15-minute duration.

From June 3 through August 21, 2020, the monitoring for airborne dust particulates was

performed utilizing two pod mounted Aeroqual Dust Sentry dust monitors that were

installed along the perimeter of the site. The dust monitors were situated at the eastern

and western portions of the site perimeter located within the work area. A plan showing the

approximate locations of each dust monitor is enclosed with this memorandum.

In general, the results of dust monitoring did not indicate concentrations of airborne dust

particulates in excess of the action level established in the RAM Plan. However, on August

8th and 12th, two isolated exceedances of the action level were recorded which were

considered attributable to equipment working in close proximity to the dust monitor located

along the western perimeter of the project site. Each exceedance was followed by dust

level measurements that were below the above referenced action level. Charts which depict

the results of each 15-minute dust measurement from both Aeroqual Dust Sentry dust

monitors are enclosed with this memorandum.

N:\Working Documents\Jobs\6531 - Arlington High\Dust Monitoring\6531_AHS-Dust Mont. Memo No.1_090120.docx WJB

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PHASE 1 BLDG FF=76.0

D

CB1GT=78.00INV (OUT)=75.00

AREA DRAIN 3GT=75.50INV.=72.67

SSS

M

T

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S

M

M

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MODULAR BLOCK RETAINING WALL(BIG BLOCK GRAVITY WALL)

PORTION OF EXIST. BUILDING TO REMAIN ANDBE PROTECTED THROUGHOUT PHASE 1

CONSTRUCTION

GC TO VERIFYLOCATION OF

PIPE ANDCONNECT IF LINE

IS LIVE

17' 8" HDPE, S=0.005

150 LF OF 6" HDPES=0.005

C

D D D D D D D D

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DD

DMH AR=76.95

INV (IN-CB1)=72.37INV (IN-CB2)=73.74INV (IN-AD3)=72.37

INV (OUT)=72.37

TEMP. CONNECTIONINV (IN)=65.5

22' 8" HDPE, S=0.20

DMH BR (PH1)=73.00R (PH3)=76.00

INV (IN-DMH X)=70.00INV (OUT)=70.00

DD

AREA DRAIN 1GT=75.85INV.=73.00

AREA DRAIN 2GT=75.85INV.=72.91

48' 8" HDPE, S=0.005

60' 8" HDPE, S=0.005

6' 12" HDPE,S=0.01

G

(2) 8" DIFIRE PROTECTIONCOLD WATER SERVICE

8" x 8" x 4" TEEAND 4" GATEVALVE (DRY TAP)

APPROX.LIMIT OF WORK

LIMITS OF PHASE I BUILDING

SMH-4RIM = 75.8

INV. (SMH-3) = 67.84INV. (IN EX.) = 62.20

INV. (OUT EX.) = 62.1± VIF

GAS LINE PER GASCOMPANY REQS.

WATER CONNECTION(GC PICK UP ALL WATERSERVICES WITHIN THEBUILDING) (SEEPLUMBING PLAN P1.1 )

GAS METER (SEE MEPPLANS BY OTHERS)

RELOCATED 8"CLDI WATER LINE

69 LF OF 6"SDR-35 PVCS = 0.010

GC TO VERIFYWASTE LINEEXITS BLDG INTHIS LOCATION

8" TEE AND GATEVALVE (DRY TAP)

WET TAP WATERCONNECTION (SEE FIREPROTECTION PLAN FP 1.0.1)

(2) 6" DIDOMESTICWATER SERVICE

FDC CONNECTION

SMH-1RIM=75.6INV.(IN) = 69.9INV.(OUT)= 69.8

8" CLDIWATERSERVICE

6" CLDIDOMESTIC 8" CLDI FIRE

PROTECTION

20 LF OF 4" CIS=0.029

4" INV. =69.25

177' 12" HDPES=0.015

4" INV. =70.32

20 LF OF 4"CIS=0.061

20 LF OF 4" CIS=0.021

6" INV. =70.32

SMH-2RIM=75.6INV.(IN) = 69.1INV. (OUT)= 69.0

SMH-3RIM=75.6

INV.(IN) = 68.37INV.(OUT)=68.27

33 LF OF 6"SDR-35 PVC

S = 0.010

43 LF OF 6"SDR-35 PVC

S = 0.010

8" TEE AND GATEVALVES

(TYP.)(DRY TAPS)

LIMITS OF BUILDINGEXPANSION

BUILDING EXPANSIONFOOTINGS PER S2.2D

PHASE 1 BUILDINGFOOTINGS PER S2.2D

BEND W/THRUSTBLOCK

BEND W/THRUSTBLOCK

TEMP. 4" CLDIDOMESTIC SERVICEWATER SERVICE

8" TEE AND GATEVALVE (DRY TAP)

GAS LINECONNECTION PER

GAS COMPANY REQS.

BEND W/THRUSTBLOCK(TYP.)

45° BEND W/THRUSTBLOCK

8" CROSS ANDGATE VALVE

8"x6" REDUCER

8"GATE VALVE

CONNECTIONTO EX. 8"

WATER MAIN

BEND W/THRUSTBLOCK

(TYP.)

GAS METER (SEEPLUMBING PLAN P1.0.1)

TEMPORARY FDC

46' 12" HDPES=0.01

ELEC. MANHOLE (SEEELECTRICAL PHASING SITEPLAN EBP E1.0.1)

TEMP. UTILITY POLE (SEEELECTRICAL PHASING SITEPLAN E1.1) (TYP.)

GAS GATE

GAS LINE PER GASCOMPANY REQS.

TEMP. FDCCONNECTION(SEE PLUMBINGPLAN FP 1.1)

6" INV. = 67.30 TIE INTOEXISTING

DRAIN LINE

4" x 6" PVCWYE

INV.=68.67

73 LF OF 6"SDR-35 PVC

S = 0.010

6" INV. = 67.30

22 LF OF 6" PVC, S= 0.036

E E

BEND W/THRUSTBLOCK

D

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99.0

'

CM TO DETERMINE IFHYDRANT IS ACTIVE . IF IT ISNOT ACTIVE PROVIDE A NEW6" DI WATER SERVICE VIA TAPAND SLEEVE FROM EXISTING8" MAIN TO THE EX. HYDRANT

75

72

73

74

75

76

75

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72

72

72

72

73

73

73

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AD-1HDPE AREA DRAINGT=71.50INV.(OUT)= 69.85

AD-2HDPE AREA DRAINGT=71.50INV (IN)=69.10INV (OUT)= 69.10

36 LF OF 6"HDPE S=0.005

INV.=68.90

CONC. PAD FOR NEWGAS METER (SIZE ASREQ'D BY GAS COMPANY)

CB2GT=76.80

INV (OUT)=73.80

10" GEOTHERMALSUPPLY LINE (SEEPLANS BY OTHERS)

(2) 10" GEOTHERMALSUPPLY LINE (SEE

PLANS BY OTHERS)

1

1

1

1

1

1

71

6" x 8"

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COMMUNICATIONS MANHOLE(SEE ELECTRICAL PHASING SITEPLAN EBP E1.0.1)

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COMM. CONDUIT(SEE ELECTRICALPLANS)

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DMH ERIM (PHASE 1)=69.30RIM (PHASE 3)=76.00

INV. (IN)=66.50INV. (OUT)=66.50

RELOCATED CULVERT 203'-48" CLDI, S=0.033

RELOCATED CULVERT221'-36" CLDI, 0.033 160 LF OF 12"

HDPE S=0.01

20 LF OF 12" CI S= 0.023

DMH CR (PHASE 1)=72.00

(4.55' COVER)R (PHASE 3)=76.00

(7.6' COVER)INV.=67.45

PR. ACCESSPOINT 1

RIM=75.00INV.(IN)=59.00

INV. (OUT)=59.00

RELOCATED CULVERT179'-36" CLDI -MJ,S=0.075

PR. ACCESS POINT #3R (PHASE 1)=46.00 (4.7' COVER)

R (PHASE 3)=49.75 (8.45' COVER)INV.(IN)=38.30

INV. (OUT)=38.30

PR. ACCESSPOINT 2R=75.25INV.(IN)=45.50INV. (OUT)=45.50

47 LF OF 12" HDPE, S = 0.24

12" INV. =67.90

12" INV. = 69.05

62 LF OF 12" HDPE,S = 0.015

DMH-12RIM (PHASE 1)=58.00 (3' COVER)RIM (PHASE 3)=62.00 (73' COVER)INV. (IN)=55.00INV. (OUT)=55.00

82 LF OF 12"HDPES = 0.13

DS-1(12' DIA. MH)

R=75.60INV.(IN-EX.)=65.60

INV.(OUT-EX.)=65.60INV. (OUT-PR)=65.60

(V.I.F)

20'-48" CLDI-PUSH ON

20'-48" CLDI-PUSH ON

20'-48" CLDI-PUSH ON

20'-48" CLDI-PUSH ON

20'-48" CLDI-PUSH ON

20'-48" CLDI-PUSH ON

20'-48" CLDI-PUSH ON

8'-48"CLDI-MJ

20'-48" CLDI-MJ20'-48" CLDI-PUSH ON

48" 11.25° CLDI6'-48" CLDI-MJ

48" 22.5° CLDI

36" 22.5° CLDI48" x 36" CLDIREDUCER-MJ

8'-36" CLDI-MJ

36" 22.5° CLDI

12'-36" CLDI-MJ

36" 22.5° CLDI

12'-36" CLDI-MJ

36" 22.5° CLDI

20'-3

6" C

LDI

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20'-3

6" C

LDI

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20'-3

6" C

LDI

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20'-3

6" C

LDI

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20'-3

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LDI

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20'-3

6" C

LDI

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36" 22.5° CLDI

36" 22.5° CLDI12'-3

6" C

LDI -

MJ

36" x 36" x36"CLDI TEE

48" x 48" x36"CLDI TEE

36" 22.5° CLDI

20'-36" CLDI -M

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20'-36" CLDI -M

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20'-36" CLDI -M

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20'-36" CLDI -M

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20'-36" CLDI -M

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20'-36" CLDI -M

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36" 22.50° CLDI

36"X36"X36" CLDI TEE

2.5'-36" CLDI-MJ36" 22.50° CLDI

GC TO COORD. W/ UTILITYCOMPANY ON TEMP.RELOCATION OF GUY WIRE

12'-36" CLDI-MJ

12'-36" CLDI-MJ

12'-36" CLDI-MJ

10'-36" CLDI -MJ

TEMPORARY 6" FIREPROTECTION SERVICE PER

FP DRAWING FP 1.0.1

8"x8"x6" TEE AND6" GATE VALVE

(DRY TAP)

UTIL

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LEGEND:

PROPOSED STORM DRAINAGE LINE

PROPOSED WATER LINE

PROPOSED FIRE PROTECTION LINE

PROPOSED SANITARY SEWER LINE

PROPOSED GAS LINE (BY OTHERS)

PROPOSED UNDERGROUND ELECTRIC LINE

PROPOSED SANITARY SEWER MANHOLE

PROPOSED STORM DRAINAGE MANHOLE

PROPOSED CATCH BASIN

PROPOSED HYDRANT

PROPOSED GAS GATE VALVE

PROPOSED WATER GATE VALVE

PROPOSED TAP AND SLEEVE VALVE

CB

APPROX. LOCATION OF ENGINEERED SOIL BARRIER

1 PVMT. TO BE DISTURBED BYCONSTRUCTION. GC TO RETURN TO EX.CONDITIONS AFTER UTILITY WORK ISCOMPLETE

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KEYPLAN

1 02/28/2020

2 03/12/2020

Approximatelocation ofAeroqual DustSentry Monitor(East)

McPhail Associates LLC

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

6/26/2020 7/1/2020 7/6/2020 7/11/2020 7/16/2020 7/21/2020 7/26/2020 7/31/2020 8/5/2020 8/10/2020 8/15/2020 8/20/2020 8/25/2020 8/30/2020

Arlington High School - Dust Monitoring Report

Aeroqual Dust Sentry Monitor (West) - 06/26/2020 thru 08/31/2020

Concentration PM10 (µg/m³)

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

6/3/2020 6/8/2020 6/13/2020 6/18/2020 6/23/2020 6/28/2020 7/3/2020 7/8/2020 7/13/2020 7/18/2020 7/23/2020 7/28/2020 8/2/2020 8/7/2020 8/12/2020 8/17/2020 8/22/2020 8/27/2020

Arlington High School - Dust Monitoring Report

Aeroqual Dust Sentry Monitor (East) - 06/03/2020 thru 08/31/2020

Concentration PM10 (ug/m3)