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MOUNTAIN HOUSE NEIGHBORHOOD"F"PROJECT INITIAL STUDY Table I11-1 SUMMARY OF MITIGATION MEASURES Level of Significance Mitigation Measures With Mitigation Transportation/Traffic TRAFFIC-1: The project sponsor shall fund the preparation of a Project Study Report(PSR)for the I-205 interchange at Mountain House Parkway prior LTS to the approval of the first final map.The determination of the level of service within the interchange shall be evaluated as part of the project's annual monitoring program. The monitored level of service shall be consistent with the procedures established in the Highway Capacity Manual. LOS D is the adopted threshold for the acceptable operation of the interchange. In the event that project-related traffic causes the levels of service to reach the LOS D threshold before reaching LOS E,issuance of building permits shall cease until necessary improvements to maintain the level of seryice are implemented. TRAFFIC-2:A 250-to 500-foot four-lane section,as adequate to accommodate traffic volumes,shall be provided on both the northbound and LTS southbound approaches of Mountain House Parkway at Grant Line Road and Mascot Boulevard. The implementation of these improvements shall be evaluated annually as part of the project's annual monitoring program. The monitored levels of service shall be consistent with the procedures for capacity analysis as established in the Highway Capacity Manual. However,once the intersection level of service reaches the LOS D threshold before reaching LUS E,these improvements shall_be_constructedprior to the issuance of any additional residential building permits_ _ TRAFFIC-3:The intersection of Mascot Boulevard and Mountain House Parkway shall be improved to provide two northbound,left-turn lanes on LTS Mountain House Parkway. In addition,the free-right turn recommended on the eastbound approach shall be constructed such that the traffic using this lane merges into southbound Mountain House Parkway traffic into a separate travel lane. Therefore,a southbound acceleration lane located south of Mascot Boulevard shall be provided to insure a smooth and unrestricted transition onto Mountain House Parkway. To accommodate the northbound dual left-turn lanes,Mascot Boulevard shall be constructed as a four-lane facility between Mountain House Parkway and the first residential access point to the west of DeAnza Boulevard. _ TRAFFIC-4:Tracy Boulevard(north of Lammers Road)shall be widened,as necessary,from two to four travel lanes to accommodate cumulative, LTS regional traffic volume increases.The County shall initiate discussion and coordinate with the City of Tracy regarding the improvements. This widening project shall be added to the San Joaquin County TIMF once improvement designs and cost estimates are completed,then development within Mountain House shallpay_its fair share of the improvements through participation in the TIMF by paying_TIMF-fees at issuance of building permits. TRAFFIC-5:One of the following options shall be implemented for New Grant Line Road when constructed east of Byron Road:Option 1:Widen Grant LTS Line Road from four to six lanes,as necessary,to accommodate cumulative,regional traffic volume increases.The County shall initiate discussion and coordinate with the City of Tracy regarding financing the improvements should the City of Tracy adopt the widening project in the future. Development within Mountain House will then pay its fair share of the improvements through participation in any County financing,such as the TIMF,by paying any such fees at issuance of building permits.Option 2:Change the level of service standard for the segment similar to Mitigation Measure M4.125(e)in the Master Plan EIR. This allows the use of LOS D rather than LOS C as the threshold of s�i6cance. -------- ----- Noise ----- — -- - ---— --- NOISE-l: Soundwalls shall be included at the locations shown in Figure 5 to reduce the outdoor noise level to an Lm,of 60 dB unless the planning LTS authorities deem that the maximum wall height is to be 7 feet. If this is the case,the residents shall be notified that the outdoor sound level has not been mitigated to the design goal of an L&of 60 dB. Alternatively,an exterior noise level standard of an Ldn of 65 dB(as permitted in the Master Plan) would allow the recommended noise wall along DeAnza Boulevard to be reduced to 7 feet in height and the wall along Mascot Boulevard to be 7 feet or less. The final wall heights and locations shall be determined prior to the issuance of building permits and after the grading and house location plans have been developed. As an alternative to constructing taller walls,the homes could be set back farther from DeAnza Boulevard and Mascot Boulevard. Increasing the setback would allow a lower height noise wall to achieve the desired exterior noise environment. However,such setbacks could reduce overall project density if lot sizes were not reduced,and thus impact the project's goals for affordable housing,non-auto related transportation and associated benefits regarding air-quality and noise. NOISE-2:Mechanical ventilation in homes shall be supplied for the two rows of lots on the east side of Central Parkway,two rows west of DeAnza LTS Boulevard and north Mascot Boulevard and to the first row of homes south of Mountain House Boulevard. C.VOBS\SJO1NrnAL SIUDYWINALJNMAL9MY-PARTI DOC(7171,00) 19 III. SUMMARY OF MITIGATION MEASURES