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Finding E. cont'd L . No quarry truck traffic is permitted to use that portion Koster adjacent to the residence. There are three quarry operations that have been approved in the vicinity of the proposed residence: Teichert (Triangle), DSS,and Cemex. Conditions of approval for these three quarries preclude the use of that portion of Koster Road south of the bridge over the Delta Mendota Canal. The Cemex haul route may only use a portion of Koster Road at a point at least 1,600 feet north of. the proposed house, and then continues north to Blewett Road.- The DSS quarry utilizes an access road to Blewett Road. The Teichert (Vernalis East Project) is subject to Conditions of Approval 2.c and 2.d. Condition(2.c)restricts the haul route to Bird Road and Condition 2.d use of conveyors or private haul roads for raw product. 2. Analysis of the existing and projected noise environment covering the subject property is contained in the EIRs prepared for the quarries referenced in paragraph A. above. (RMC Pacific Vernalis Quarry—now CEMEX SCH#2002122122; DSS Engineering Contractors proposed Koster Road Quarry Excavation SCH#96112069 and Environmental Noise Assessment DSS Reschedule of Hours of Operation, Bollard and Brennan, April 2002;Vernalis West and East Project SCH#2006022089) None of these documents suggest that the noise standards adopted by the County would not be met at the location of the proposed residence. The DSS processing plant noise is barely distinguishable from other background noise with a predicted Leq in the mid 40 decibels range (see Environmental Noise Assessment, Bollard &Brennan, April 2002). The proposed CEMEX processing plant is closer and the projected Leq is about 54 decibels, well within the maximum 65 dB Ldn allowed by San Joaquin County Code (9-1025.9). Bollard&Brennan also measured the noise generated by."belly » e of tenial at 65 dB Le at a distance scrapers used to excavate/remove the raw ma q 100 feet. Since the proposed home would be about 600' from the closest CEMEX excavation, based on a generally accepted worst case noise level reduction of 6db for every doubling of distance (see Bollard and Brennan),noise levels from CEMEX excavation operations would result in maximum Ldn of about 51 db. The DSS site excavation, although closer, is well below original grade and is separated by an earth berm planted with oleander. The presence of the berm alone would reduce the Ldn by 5 dB (See Bollard&Brennan) 3. Dust control is regulated by the San Joaquin Valley Air Pollution Control District (SJVAPCD). Specifically, quarry operations are subject to SJVAPCD Regulation VIII; are subject to dust control plans and monitoring. The adopted finding for the Cemex quarry concluded that the only significant and unavoidable cumulative impacts related to the existing and proposed quarries related to air quality and noise for residences located along the haul route. 4. Vibrations- Chapter 9-1025 of the San Joaquin County Development Title regulates vibrations as follows: °19-1025.5(a) Perceptible Displacement. No use shall cause any perceptible displacement at any lot line abutting any zone except an I-G Zane." 4