CHICOPEE, Mass. (WWLP) - New changes at the United States Postal Service (USPS) are set to begin on Tuesday. Karen Read’s murder case retrial begins amid jury selection issues The cost-saving measures aim to save $36 billion in the next decade, however the USPS says they'll be able to preserve delivery times and give people more information on when they can expect their packages. This comes as part of the “Delivering for America” 10-year plan to modernize the postal network, achieve financial sustainability, and improve service quality across all mail and shipping categories. The USPS says they're streamlining networks, cutting work hours, and closing unnecessary facilities.  The Postal Regulatory Commission says the service is downplaying the effects these cuts could have, and they jeopardize the reliability of the USPS especially in rural communities like western Massachusetts. They cite that 49.5% of zip code pairs will experience downgraded services for single-piece first-class mail, because the postal service “currently lacks a system” to accurately measure service performance at the five-digit level, as current standards are based on three-digit zip code pairs. However, the USPS has stated “the majority of mail and package volume, including those destined to rural communities, originates in zip codes that are within 50 miles of a regional processing and distribution center”, and therefore can be processed more quickly. Customers are asked to consult USPS resources in understanding expected delivery times for their mail. Local News Headlines DPU penalizes National Grid for billing errors that impacted thousands USPS changes begin Tuesday: How could your mail be affected Karen Read’s murder case retrial begins amid jury selection issues Cycling class kicks off Springfield Jewish Community Center’s Journey Across America: Coast to Coast fitness challenge WWLP-22News, an NBC affiliate, began broadcasting in March 1953 to provide local news, network, syndicated, and local programming to western Massachusetts. Watch the 22News Digital Edition weekdays at 4 p.m. on WWLP.com. ...read more read less