SITE INFORMATION AND CORRESPONDENCE

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5.7 NOISE Control facility to the south. The project site is on land owned and incorporated by the City of Lodi, and is approximately 6 miles west of the Lodi city center. The city of Stockton is approximately 2 miles to the south. The project site is currently undeveloped and is used for equipment storage during upgrades to the WPCF. The area is developed primarily into agricultural land uses with rural residences, I-5 and local roadways, and irrigation canals in the vicinity. There are three residences located approximately 0.75 mile to the north of the power plant site on the opposite side of I-5; these are the closest residences. Other rural residences are located over 1 mile away. 5.7.2.2 Ambient Noise Survey LEC conducted continuous ambient noise monitoring to determine the level of noise in the project area. The monitoring was conducted at the four locations shown in Figure 5.7-1. Locations M1 through M3 are existing residences-M1 is the closest residence, approximately 0.75 mile north of the LEC. Location M4 was located north of the residential development on golf course property. Larson Davis 824 and 820 ANSI Type 1 (precision),statistical sound level meters were used to conduct the continuous measurements. The sound level meters was field calibrated before and after the measurement with a Larson Davis CAL200 and was factory calibrated within the previous 12 months. The hourly results are summarized in Table 5.7-3 through 5.7-6. The existing STIG project was operating at base load throughout the ambient monitoring period except between approximately 1 AM and 6 AM the morning of July 8,2008.The primary noise source at each of the monitoring locations was traffic from 1-5 and local road. The existing STIG operations were not audible at any of the monitoring locations during the day or nighttime hours. Location M4 also reflects operational and maintenance activities at the golf course which includes watering,mowing and other equipment. The lowest four hour average L90 levels at M1 through M4 were 55,43,40 and 38 dBA respectively. As expected,the existing noise levels generally decrease as distance to I-5 increases. Conditions throughout the survey were clear to hazy/smoky given wildfire activity. Humidity was low during the day and increased through the night,ranging between 20 percent and 60 percent. The temperature ranged from approximately about 70° F at night to 105°F during the day. Wind speeds were observed to be generally calm or less than 10 mph throughout the monitoring period.Wind was not observed to result in excessive noise on the microphone. 5.7-4 SAC/371322/08234009(LEC_5.7_NOISE.DOC)