The first of two open houses is scheduled Tuesday on a major pipeline project that could impact residents and businesses in La Mesa and Spring Valley. The $28.6 million project will reline 4.3 miles of pipeline from Lake Murray to the Sweetwater Reservoir, according to the San Diego County Water Authority. Early stages of the work, scheduled to begin later this month, could affect busy Baltimore Drive and Spring Street. The Water Authority said the project could take until summer next year to complete.