Riverside County Integrated Project

Table 1 Noise Measurements within Riverside County
Location	Start Time	Leq (dBA)	Noise Sources	Remarks
1. 15' north of Temescal Canyon Rd. near lake	8:35 a.m.	65.8	Traffic on Temescal Canyon Rd.	Trucks made up for most of the noise; overall traffic was moderate; I-15 south of the monitoring site contributed to noise level as well
2. 20' southwest of Collier Rd.; At intersection of Central St. & Collier Rd.	9:20 a.m.	64.9	Busy traffic on Collier Road; moderate Traffic on Central Ave.	Traffic was continuous on Collier Road
3. 15' south of Bundy Canyon Rd.; At intersection of Bundy Canyon Rd. & Mission Trail	10:00 a.m.	61.8	Traffic on Bundy Canyon Rd.	Traffic was dense at times and non-existent at others
4. 15' east of Clinton Keith Rd., near intersection of Clinton Keith Rd. and Palomar/Washington St.	10:45 a.m.	67.6	Traffic on Clinton Keith Road and Palomar St.	Traffic was continuous on Clinton Keith and Palomar St.
5. 15' southeast of SR-79, near intersection of Clinton Keith Rd. and Margarita Rd..	11:40 a.m.	67.2	Traffic on SR-79 and Margarita Rd.; plane flying overhead	Traffic was heavy and continuous on SR-79; moderate traffic on Margarita Rd.
6. 15' east of Murrieta Rd., near intersection of Murrieta Rd. Bundy Canyon/Scott Rd.	12:40 p.m.	65.3	Traffic on Murrieta Rd.	Traffic was moderate on Murrieta Rd. and Scott Rd.
7. 15' west of SR-79, near intersection of SR-79 and Scott Rd.	1:25 p.m.	67.1	Busy traffic on SR-79; traffic on Scott Rd.	Traffic was busy and continuous on SR-79; moderate traffic on Scott Rd.
8. 15' south of McCall Blvd., near intersection of McCall Blvd and Murrieta Rd..	2:20 p.m.	65.1	Traffic on McCall Blvd and Murrieta Rd.; plane flying overhead	Traffic was moderate on both McCall Blvd. And Murrieta Rd.
9. 15' south of McWade Ave., near intersection of McWade Ave. and Olson Ave.	3:00 p.m.	65.3	Traffic on McWade Ave and Olson Ave.	Moderate traffic on Olson and McWade
10 15' east of Cornell St., between parallel streets of Mayberry Ave. and McDowell St.	3:50 p.m.	66.1	Traffic on Cornell St; traffic on Mayberry Ave; traffic on McDowell St.	Moderate traffic on all three streets.
11 15' south of Ellis Ave.; SH-74 to the North	2:40 p.m.	66.5	Traffic on Ellis Ave; traffic on SH-74	Moderate traffic level on Ellis Ave.
12 15' south of Reservoir Ave., near intersection of Reservoir Ave. and Davis Rd./Hansen Ave.; Ramona Express way to the north	3:25 p.m.	65.1	Traffic on Reservoir Ave.; traffic on Davis/Hansen; traffic on Ramona Express way	Moderate traffic levels on Davis Rd. and Reservoir Ave.
13 15' north of Cherry Valley Blvd., near intersection of Beaumont Ave. and Cherry Valley Blvd.	4:20 p.m.	65.5	Traffic on Cherry Valley Blvd. And Beaumont Ave.	Moderate traffic levels on Cherry Valley Blvd. And Beaumont Ave.
14 14' from the street in the southwest corner of Magnolia Ave. and McKinley St.	9:40 a.m.	71.3	Traffic on McKinley St. and Magnolia Ave.	Both streets are major streets with heavy traffic in each direction.
15 22' from the street in the southeast corner of Cajalco Rd. and Temescal Canyon Rd.	10:40 a.m.	70.9	Tractor trailer trucks on Cajalco Rd. and recycling equipment at Liston Aluminum Company	Intersection is all way stop; Liston Aluminum Co. is located in the northwest corner of the intersection.
16 15' from the street in the southeast corner of Cajalco Rd. and El Sobrante Rd.	11:30 a.m.	70.0	Traffic on Cajalco Rd and El Sobrante Rd., including cars, pick up trucks, and tractor trailer trucks	Three way intersection with a stop sign on El Sobrante Rd.
17 12' from the street in the northwest corner of Archibald Ave. and Schleisman Rd.	12:20 p.m.	73.0	High volume of trucks on Archibald Ave.	Three legged signalized intersection; dairy farms located at northwest and southwest corners
18 15' from the street in the northeast corner of McAllister St. and El Sobrante Rd.	2:00 p.m.	71.9	Construction activity in the northwest corner of the intersection and traffic on El Sobrante Rd.	Three legged intersection; very little development nearby
19 15' from the street in the northwest corner of Washington St. and Van Buren Blvd.	2:35 p.m.	72.3	High volume of traffic entering a 7-11 market for gasoline; continuous barking dogs	7-11 market located in the northwest corner of intersection
20 15' from the street in the southeast corner of Jurupa Rd. and 10^th St.	3:35 p.m.	69.8	Heavy tractor trailer truck traffic on 10^th St. and high volume of traffic entering Circle K market	Across from Vanny’s Auto Service located at 10596 Jurupa Rd.; all way stop intersection
21 15' from the street in the northeast corner of Valley Rd and 34^th St.	4:10 p.m.	69.9	Construction activity approximately 300 yards to the north and traffic on Valley Rd.	Intersection is signalized
22 15' from the street in the southeast corner of Center Ave. and Mt. Vernon Ave.	5:40 p.m.	56.6	Light traffic on Center Ave. and Mt. Vernon Ave. and helicopter flyover a quarter mile away	Intersection has an all way stop sign
23 15' from the street in the southeast corner of Arrowhead Blvd. and 28^th St.	10:35 a.m.	65.2	Traffic on 28^th St. and Arrowhead Blvd. and agricultural equipment nearby	Intersection is a three legged intersection; free-flowing traffic on 28^th St.; Highway 78 is located to the east
24 15' from the street in the northwest corner of Highway 86 and 62^nd Ave.	1:05 p.m.	76.1	Heavy tractor trailer traffic on Highway 86 and agricultural tractors in the southwest direction	Intersection is a two way controlled stop; tractors in operations were about 70 yards from the meter
25 15' from the street in the northwest corner of Adams St. and 42^nd Ave.	2:15 p.m.	67.5	Traffic on Adams St. and 42^nd Ave. including cars, pick up trucks and vans	Intersection is an all way controlled stop; residential development in three corners
26 15' from the street in the southeast corner of Ramon Rd. and Via Las Palmas.	3:15 p.m.	70.5	Traffic on Ramon Rd. and Via Las Palmas	Three-way intersection; intersection; free-flowing traffic on Ramon Rd.; many residential developments to the north of the intersection
27 15' from the street in the northwest corner of Broadway Rd. and Bonita Ave.	4:30 p.m.	65.7	Traffic on Broadway Rd. and Bonita Ave.	Free flowing traffic on Broadway Rd.; residential developments in the southeast corner of the intersection
Source: LSA Associates 1999

Table 2 Measured Traffic Noise Level
Roadway Segment	ADT	Centerline to 70 Ldn, feet	Centerline to 65 Ldn, feet	Centerline to 60 Ldn, feet	Ldn (dBA) 50' from outermost lane
La Sierra Ave at El Sobrante Rd.	12,200	< 50¹	81	171	66.2
Van Buren Blvd. at Mockingbird Canyon Rd.	24,540	61	127	271	69.2
Alessandro Blvd. at West Frontage Rd.	21,126	56	115	246	68.6
Felspar St. at Galena St.	21,256	56	116	247	68.6
Iowa Ave. at Center St.	15,200	< 50	93	197	67.2
Market St. at Via Cerro	13,400	< 50	86	182	66.6
Mission Blvd. at Etiwanda Ave.	27,000	65	135	289	69.7
N. Main St. at Placentia Ln.	15,500	< 50	94	200	67.2
Riverview Dr. at Mission Blvd.	12,618	< 50	83	175	66.4
Sierra Ave. at Armstrong Rd.	11,700	< 50	79	166	66.0
Van Buren Blvd. at Jurupa Rd.	22,714	58	121	258	68.9
McCall Blvd. at Sun City Blvd.	10,500	< 50	74	155	65.6
Newport Rd. at Murrieta Rd.	24,200	61	126	269	69.2
Palm Dr. at Dillon Rd.	17,600	< 50	102	218	67.8
Murrieta Hot Springs Rd. at Margarita Rd.	11,528	< 50	78	165	66.0
McCall Blvd. at Sherman Ave.	10,252	< 50	73	152	65.5
Ramon Rd. at Bob Hope Dr	20,266	54	112	239	68.4
Van Buren Blvd. at I-215	24,900	62	128	274	69.3
Van Buren Blvd. at Suttles Dr.	29,500	68	143	306	70.0
Green River Rd. at Fresno Rd.	13,000	<50	84	178	66.5
Serfas Club Dr. at Pinecrest Dr.	10,800	< 50	75	158	65.7
Grand Ave at Baldwin Blvd.	12,500	< 50	82	174	66.3
Limonite Ave. at Etiwanda Ave	17,300	< 50	101	215	67.7
Stetson Ave. at Dartmouth St.	19,284	< 50	109	231	68.2
Washington St. at Fred Waring Dr.	23,610	60	124	264	69.1
Indian Ave. at Dillon Rd.	11,890	< 50	80	168	66.1
La Sierra Ave. at Cleveland Ave.	10,190	< 50	72	152	65.4
Van Buren Blvd. at Ridgeway Ave.	34,864	76	160	342	70.8
Palm Dr. at Varner Rd.	13,168	< 50	85	180	66.5
Van Buren Blvd. at Canyonview Dr.	26,248	64	133	284	69.5
Cajalco Rd. at Haines St.	27,448	65	137	292	69.7
Rubidoux Blvd. at 30^th St.	20,840	55	114	243	68.5
Newport Rd at Avenida De Cortez	14,176	< 50	89	189	66.9
Cajalco Rd. at Brown St.	13,124	< 50	85	179	66.5
Mission Blvd. at Rubidoux Blvd.	25,420	62	130	278	69.4
Van Buren Blvd. at Clay St.	46,690	91	194	416	72.0
Grand Ave. at Stoneman St.	10,166	< 50	72	151	65.4
Magnolia Ave. at McKinley St.	16,548	< 50	98	209	67.5
Mission Blvd. at Valley Wy.	16,708	< 50	99	210	67.6
Rubidoux Blvd. at 34^th St.	25,434	62	130	278	69.4
Limonite Ave. at Clay St.	15,642	< 50	95	201	67.3
Mission Blvd. at Glen St.	10,470	< 50	73	154	65.5
McCall Blvd. at Bradley Rd.	11,112	< 50	76	161	65.8
Limonite Ave. at Collins St.	15,746	< 50	95	202	67.3
Van Buren Blvd. at Studio Pl.	34,218	75	158	338	70.7
Bundy Canyon Rd. at Sellers Rd.	10,092	< 50	72	151	65.4
Magnolia Ave. at Byron St.	15,856	< 50	96	203	67.3
Limonite Ave. at Downey Ave.	24,068	60	125	268	69.0
Mission Blvd. at Avalon St.	26,022	63	132	282	69.5
Mission Blvd. at Twining St.	15,528	< 50	94	200	67.3
Stetson Ave. at Yale St.	12,702	< 50	83	175	66.4
Etiwanda Ave. at Iberia St.	18,206	< 50	105	223	67.9
El Sobrante Rd. at Cajalco Rd.	6,112	< 50	< 50	108.6	63.2
Wood Rd. at Gentian Ave.	7,004	< 50	57.4	118.7	63.8
Corydon St. at Grand Ave.	9,600	< 50	69.6	145.9	65.2
Scott Rd. at Murrieta Rd.	7,300	< 50	58.8	121.9	64.0
Archibald Ave. at River Rd.	6,500	< 50	54.8	113	63.5
Archibald Ave. at Cloverdale Rd.	9,100	< 50	67.3	140.8	64.9
Center St. at Commercial St.	8,100	< 50	62.6	130.5	64.4
Center St. at Stephen Ave.	7,100	< 50	57.8	119.7	63.8
Iowa Ave. at La Cadena Dr. E	9,400	< 50	68.7	143.9	65.1
Mission Blvd. at Pyrite St.	7,344	< 50	59	122.4	64.0
Mission Blvd. at Conning St.	9,070	< 50	67.2	140.5	64.9
Mission Blvd. at Milliken Ave.	8,200	< 50	63.1	130.5	64.5
Pedley Rd. at Jurupa Dr.	7,100	< 50	57.8	119.7	63.8
Bradley Rd. at Cherry Hills Blvd.	6,420	< 50	54.4	112.1	63.4
Mc Call Blvd. at Hillpointe Dr.	6,466	< 50	54.7	112.7	63.4
Gilman Springs Rd. at SH-79	6,726	< 50	56	115.6	63.6
Simpson Rd. at Patterson Ave.	8,000	< 50	62.2	129.4	64.4
Beaumont Ave. at Cherry Valley Blvd.	8,500	< 50	64.5	134.7	64.6
Highland Spring Ave. at Brookside Ave.	6,700	< 50	55.8	115.3	63.6
Redlands Blvd. at San Timoteo Canyon Rd.	6,162	< 50	53.1	109.2	63.2
Dillon Rd. at Long Canyon Rd.	9,800	< 50	70.5	147.8	65.3
Jefferson St. at Fred Waring Dr.	8,864	< 50	66.2	138.4	64.8
Central Ave. at Sycamore Canyon Blvd.	9,842	< 50	70.7	148.3	65.3
Murrieta Rd. at Garboni Rd.	7,966	< 50	62	129.1	64.3
Reche Canyon Rd. at Keissel Rd.	7,606	< 50	60.3	125.2	64.1
Cajalco Rd. at Gustin Rd.	8,912	< 50	66.4	138.9	64.8
Wood Rd. at Van Buren Blvd.	8,500	< 50	64.5	134.7	64.6
Central St. at Palomar St.	7,000	< 50	57.3	118.6	63.8
Stanford St. at Mayberry Ave.	9,300	< 50	68.2	142.8	65.0
Temescal Canyon Rd. at Minnesota Rd.	8,400	< 50	64.1	133.6	64.6
Jurupa Rd. at Van Buren Blvd.	9,534	< 50	69.3	145.2	65.1
Mission Blvd. at Soto Ave.	8,600	< 50	65	135.7	64.7
Menifee Rd. at SH-74	6,300	< 50	53.8	110.8	63.3
Simpson Rd. at Lindenberger Rd.	7,400	< 50	59.3	123	64.0
Ramona Express Way at Warren Rd.	9,172	< 50	67.6	141.6	65.0
Cajalco Rd. at Gavilin Rd.	9,416	< 50	68.7	144	65.1
Ontario Ave. at El Cerrito Rd.	7,114	< 50	57.9	119.9	63.9
Dillon Rd. at Mountain View Rd.	8,176	< 50	63	131.3	64.5
Ontario Ave. at Piute Creek	7,146	< 50	58.1	120.2	63.9
Mission Blvd. at Lindsay St.	8,526	< 50	64.6	134.9	64.6
Jurupa Rd. at Rigel WY.	7,682	< 50	60.6	126	64.2
Valley WY. at Jurupa Rd.	9,732	< 50	70.2	147.2	65.2
Murrieta Rd. at E Winchester Rd.	8,588	< 50	64.9	135.6	64.7
Murrieta Rd. at Ridgemoor Rd.	9,850	< 50	70.7	148.3	65.3
Cajalco Rd. at Clark St.	7,736	< 50	60.9	126.6	64.2
Rubidoux Blvd. at 28^th St.	9,408	< 50	68.7	143.9	65.1
Reche Canyon Rd. at Reche Vista Dr.	7,800	< 50	61.2	127.3	64.3
Archibald Ave. at Schleisman Rd.	7,278	< 50	58.7	121.7	64.0
Stetson Ave. at Columbia Ave.	9,662	< 50	69.8	146.5	65.2
Mission Blvd. at Glen St.	8,830	< 50	66.1	138.1	64.8
Mc Call Blvd. at Aspel Rd.	7,888	< 50	61.6	128.2	64.3
Wood Rd. at Mariposa Ave.	9,730	< 50	70.1	147.1	65.2
Pyrite St. at Mission Blvd.	8,648	< 50	64.4	134.3	64.6
Reche Canyon rd. at Mercadante Ln.	7,562	< 50	60.1	124.8	64.1
Mission Blvd. at Pedley Rd.	9,258	< 50	68	142.4	65.0
Stetson Ave. at Stanford St.	7,502	< 50	59.8	124.1	64.1
Market St. at Agua Mansa Rd.	9,796	< 50	70.4	147.8	65.2
Hamner Ave. at Mission Blvd.	8,286	< 50	63.5	132.4	64.5
SH-243 at Pinecrest Ave.	6,500	< 50	100.7	209.2	66.7
SH-79 at Auld Rd.	9,734	65.6	129.3	272.5	68.4
SH-60 at I-15	139,000	345	741	1595	80.0
SH-60 at Market St.	80,000	240	513	1104	77.6
I-215 at Fair Isle Dr.	143,000	352	755	1625	80.1
SH-60 at Jack Rabbit Tr.	30,500	129	271	581	73.4
I-10 at San Timoteo Canyon Rd.	48,000	172	357	785	75.4
I-10 at Washington St.	44,500	164	348	747	75.0
I-15 at Magnolia Ave.	87,000	253	542	1167	78.0
SH-74 at Briggs Rd.	17,612	92	189	403	71.0
Source: LSA Associates, Inc. 1999. Traffic Noise within 50 feet of roadways requires a site specific analysis.

Figure 1: Projected Traffic Noise Contours-Freeway (10 Lanes)

Figure 2: Projected Traffic Noise Contours-Freeway (6 Lanes)

Figure 3: Projected Traffic Noise Contours-Expressway (6 Lanes)

Figure 4: Projected Traffic Noise Contours-Urban Arterial (6Lanes)

Figure 5: Projected Traffic Noise Contours-Arterial Highway (4 Lanes)

Figure 6: Projected Traffic Noise Contours-Major Highway (4 Lanes)

Figure 7: Projected Traffic Noise Contours-Mountain Arterial (4 Lanes)

Figure 8: Projected Traffic Noise Contours-Secondary Highway (4 Lanes)

Figure 9: Projected Traffic Noise Contours-Collector Street (2 Lanes)

Figure 10: Existing Railroad Noise Contours-Coronita Area

Figure 11: Existing Railroad Noise Contours-Near Van Buren and Limonite

Figure 12: Existing Railroad Noise Contours-North of Palm Desert

MEMO: Requirements for Determining and Mitigating Non-transportation Noise Source Impacts to Residential Properties.

APPLICATION:

This document is intended to provide guidelines for the determination of community noise impact due to non-transportation (hereafter known as "stationary") noise sources. Noise sources covered by this standard include, but are not limited to: industrial facilities, mining activities, loading dock activities, loud speakers operation, sporting events, musical performances, well pumps, equipment, vehicles operated off the public roadways, or any noise producing activities associated with a permanent fixed base of operation (hereafter referred to as the "facility"). Temporary construction activities are not covered by the standard.

NOISE STANDARDS FOR STATIONARY NOISE SOURCES:

Facility-related noise, as projected to any portion of any surrounding property containing a "habitable dwelling, hospital, school, library or nursing home", must not exceed the following worst-case noise levels.

A) 45 dB(A) - 10 minute noise equivalent level ("leq"), between the hours of 10:00 p.m. to 7:00 a.m. (nighttime standard).

B) 65 dB(A) - 10 minute leq, between 7:00 a.m. and 10:00 p.m. (daytime standard).

REQUIREMENTS FOR DETERMINATION OF COMMUNITY NOISE IMPACT:

1. Noise originating from operations within the facility grounds shall be treated as "stationary" noise sources for which this standard will apply.

2. Noise Modeling Methodology: Noise predictions are to be made by an engineer, acoustical consultant, or other similar professional with experience in predicting community noise exposure using standard methods and practices of the noise consulting industry.

3. Required Modeling Parameters for Stationary Sources:

i. Stationary sources are to be modeled as "point" sources.

ii. Mobile point sources are to be modeled as emanating from the acoustical centroid of the activity, or at its closest approach to potentially impacted residential property lines, which ever yields the worst-case results.

iii. Noise modeling for each piece of acoustically significant equipment, process or activity must be based on Reference Noise Levels (RNL). RNL may be obtained directly from the manufacturer (in the case of equipment) or generated from field studies. Regardless, the data must be representative of worst-case conditions. Directionality of the noise source must be taken into consideration if applicable.

iv. Predicted noise levels are to be expressed in germs of worst-case "equivalent continuous sound levels" [or, Leq] averaged over a ten minute period.

v. For modeling purposes, receivers are assumed to be positioned at the property line boundary at an elevation of five feet off the ground.

vi. Terrain conditions for modeling noise propagation: Assumptions regarding ground effects, atmospheric absorption and other forms of noise attenuation must be fully justified.

NOISE REPORT FORMAT AND REQUIRED SUBMITTALS:

The noise Consultant's findings and recommendations must be submitted for review, and receive approval from, the Office of Industrial Hygiene. The resulting report must incorporate the requirements above and, at a minimum, contain the following information:

a) an adequate and accurate characterization of the current ambient noise environment;

b) a clear description of the proposed facility and its activities including a step-by-step flow chart of manufacturing processes if applicable;

c) the identity and characterization of all acoustically significant equipment and/or activities;

d) a discussion of analytical methodology and parameters used for noise modeling;

e) a table containing reference noise data accompanied by a detailed description of how it was obtained;

f) the facilities hours of operation;

g) a discussion of anticipated production volume, how it is expected to change over time and how such change will effect community noise;

h) a discussion of worst-case unmitigated noise impact;

i) a discussion of mitigation (if necessary);

j) a printed copy of computer input/output (if available) or manual calculations clearly illustrating the rationale for the Consultant's conclusions.

In addition, the final noise report must contain a scaled map(s) defining the acoustical contours surrounding the facility. Minimally, this map(s) must show:

a) The facility relative to the residential properties surrounding it. Include both unincorporated and incorporated (any adjoining Cities) area surrounding the project and potentially affected by project-related noise.

b) The 65 dB(A) 10 minute Leq noise contour reflecting the anticipated "worst-case" conditions between the hours of 7AM - 10 PM (daytime hours).

c) The 45 dB(A) 10 minute Leq noise contour reflecting the anticipated "worst-case" conditions between the hours of 10 PM - 7AM (nighttime hours).

d) The location and number of residential structures located within these contours.

MEMO: Requirements for Determining and Mitigating Traffic Noise Impacts to Residential Structures.

NOISE STANDARDS:

1. The Noise Element of the General Plan indicates that to avoid future noise hazard, the maximum capacity design standard for highways and major roads will be used for determining the maximum future noise level or, in the case of freeways and airports, the estimated conditions 20 years in the future.

2. The interior noise levels in residential dwellings shall not exceed 45 Ldn/CNEL.

3. The exterior noise level shall not exceed 65 Ldn/CNEL.

4. Required Noise Prediction Model – Traffic Noise: FHWA RD 77-108 Highway Traffic Prediction Model, Sound 32 or the equivalent.

REQUIRED TRAFFIC NOISE MODELING PARAMETERS:

1. Roadway Classification: All roadways must be classified into one of the following categories as defined in the General Plan: Secondary, Major, Arterial, Urban Arterial, Expressway, Freeway, and Specific Plan Road.

2. Roadway Traffic Volume: All roadways must be modeled using Average Daily Trip (ADT) Level of Service “C” design capacities. For roadways classified by the General Plan as variable, future build-out traffic volumes must be obtained from the County’s Transportation Department

3. or in the case of freeways, from Caltrans.

4. Required vehicle mix.

• Freeways: Vehicle mix information must be obtained from Caltrans.

• Roadways designated as major, arterial highways, or expressways:

VEHICLE	OVERALL %	DAY (7AM-7PM) %	EVENING (7PM-10PM) %	NIGHT (10PM-7AM) %
Auto	92	69.5	12.9	9.6
Medium Truck	3	1.44	0.06	1.5
Heavy Truck	5	2.4	0.1	2.5

• Roadways designated as secondary, collectors, or smaller:

VEHICLE	OVERALL %	DAY (7AM-7PM) %	EVENING (7PM-10PM) %	NIGHT (10PM-7AM) %
Auto	97.4	73.6	13.6	10.22
Medium Truck	1.84	0.9	0.04	0.9
Heavy Truck	0.74	0.35	0.04	0.35

5. Traffic Speed: For County roads assume an average traffic speed of 40 MPH. For freeways, contact CALTRANS and use what speed they recommend.

6. Terrain conditions for modeling noise propagation: Assume “hard site” conditions in determining noise propagation (no more than 3 dB of attenuation per doubling of distance between source and receiver).

7. Noise attenuation attributed to standard residential architecture: It is assumed that standard residential design (with windows closed) will provide no more than 20 dB (A) of attenuation. Additional mitigation must be demonstrated via modeling.

8. Receiver placement for modeling exterior noise levels (unmitigated): Noise levels must be estimated at the exterior face of the nearest residence at an elevation of five feet above the finished pad.

• Receiver placement for noise barrier design: Set back: Barrier calculations shall be based on a hypothetical outdoor receiver located ten (10) feet behind the intervening noise barrier.

• Receiver height: Initial calculations shall be based on a receiver height of five (5) feet above the ground. If these calculations result in a barrier less than or equal to six (6) feet in height, no further barrier calculations are necessary and this shall be selected as the required wall height.

9. However, if the resulting barrier height is calculated to be greater than six feet, it shall be re-calculated using a receiver height of three (3) feet. The resulting re-calculated wall height shall be then selected as the required wall height.

10. Receiver placement for architectural-based (indoor) noise mitigation – first floor: First floor interior noise level predictions are to be calculated assuming a hypothetical receiver is located in the center of the room nearest the noise source and elevated 5 feet above the pad (finished floor).

NOISE REPORT FORMAT AND REQUIRED SUBMITTALS:

The noise Consultants findings and recommendations must be submitted for review, and receive approval from, the Office of Industrial Hygiene. The resulting report must incorporate the requirements above and, at a minimum, contain the following information: a) a clear description of the proposed project; b) the identity and characterization of all acoustically significant roadways; c) a discussion of analytical methodology and parameters used for noise modeling; d) information obtained from applying requirements 6-10 (above); e) a discussion of mitigation (if necessary) including a clear diagram illustrating noise barrier placement; f) a printed copy of computer input/output (if available).

In addition to the report, Industrial Hygiene must be provided with the following depending on the design stage of the project. The first item that must be provided is a scaled map (blue-line) of the project. This map must clearly illustrate lot boundaries and the relative location of all acoustically significant roadways. Topographical elevations for lots and roadway centerlines must be included. Second, if architectural-based mitigation is necessary, and if the project has progressed to the point where plans for the homes have been drawn, copies must be provided (floor plans and exterior elevation drawings). Additionally, an updated blue-line showing exact pad location and finished floor elevation must be included.

MEMO: Potential Studies Requiring Input from Department of Public Health

I. STUDIES

Except for WECS (Wind Energy Conversion Systems) Noise, Department of Public Health input is discretionary as determined by the Planning Department. Regularly, the Planning Department requests Department of Public Health reviews concerning the acoustical issues associated with a project. Less frequently, the Department may be requested to comment on ground vibration from trains (may apply to noise sensitive receptor within 1,000 feet of a rail corridor) and release of silica dust from sand and gravel pit operations. In addition, in response to community and planning commissioners comments, the Planning Department may request Department reviews of projects having the following associated issues: nuisance dust, cement dust, electromagnetic fields from power lines, and asbestos dust.

A. Noise Appraisals

Noise appraisals fall into three groups each with distinct criteria; Transportation noise receptors, e.g. tracts receiving noise from highways and airports; stationary noise sources, e.g. projects emitting significant noise impacting neighboring communities; and Wind Energy Conversion Systems noise (WECS or Windturbine Farms). An applicant should be aware that a given project may fall into more than one group. The following outlines the minimum criteria associated with each group.

1. Transportation noise receptors:

(a) Interior noise levels in residential dwellings shall not exceed 45 Ldn (or CNEL).

(b) Exterior noise levels shall not exceed 65 Ldn (or CNEL).

2. Stationary noise sources:

During hours of 7 A.M. to 10 p.m. and 10 p.m. to 7 A.M., the noise levels shall not exceed 65 and 45 dB,A weighted ten minute Leq, respectively, as projected to any portion of a lot with occupied residence.

3. WECS Noise.:

WECS shall comply with criteria established by Ordinance No. 348.258 and Resolution No. 93-378.

4. Consultants Expertise:

The acoustical study demonstrating compliance with these categories shall be performed by a noise consultant with at least two years experience in acoustical design and mitigation. The consultant shall be able to utilize FHWA Highway Traffic Noise Prediction Model and Sound 32. Preferably the consultant shall be a member of the Institute of Noise Control Engineering or a Certified Industrial Hygienist.

B. Other Studies

For other studies requiring our input, the applicant shall contact Industrial Hygiene for guidelines in providing a study prior to conducting the assessment or study.

II. FEES

Our current man-hour fee (subject to change by ordinance) is $95 per hour devoted to the project including review and comment, verbally and in writing. Any time consumed by traveling to and attending meetings (including public hearings) on behalf of the project is also included. In addition, incidental expenses such as mileage at .29/mile, meals, lodging, and miscellaneous transportation expenses may be incurred. Note, the incidental expenses other than mileage are rarely utilized.

III. DEPOSITS

For WECS, a $500 deposit is required. Frequently, expenses exceed this deposit and additional deposits are requested prior to completion of reviews and participation at public hearings. For all others, a $1,500 deposit is requested. This is generally sufficient, unless the project is complex and/or controversial, involving many revisions, and/or attendance at meetings.