SR0084573 (2) - Laserfiche WebLink

Home Browse Search

USA Waste of California , Inc . WCentral Valley Compost WASTE MANAGEMENT ° 920 W . Frewert Road Lathrop , CA 95330 3 /22/2021 Howard Hold , P . G . Compliance & Enforcement Program Central Valley Regional Water Quality Control Board 11020 Sun Center Drive # 200 Rancho Cordova, CA 95670 Subject : USA Waste of California , Central Valley Compost Facility Request to Abandon the on - site Piezometer Dear Mr . Hold : Central Valley Compost ( CVC ) requests to abandon the on- site piezometer located at the north end of the CVC facility near the office building in order to accommodate the installation of an upgraded septic system to be located adjacent to this area . Local permitting officials require the removal of this piezometer prior to installing the new septic system . This piezometer has been used to monitor water levels at the Site . However , with the completion of the two new on- site compost water ponds , the piezometer is no longer required as each pond was designed to include an underdrain system that has two monitoring locations to assess groundwater levels beneath the ponds . The underdrains allow for monitoring the presence of groundwater through 18 - inch diameter high density polyethylene (HDPE) riser pipes located at both the eastern and western ends of the ponds (total of four monitoring locations ) . The underdrains were constructed approximately three feet below the elevation of the pond liner systems . Groundwater can therefore be detected in the underdrains prior to rising to an elevation of two feet below the pond liners . Since we do not anticipate that groundwater will be detected in the underdrains , CVC will utilize these monitoring points to demonstrate compliance with maintaining two feet of separation between the pond liner systems and groundwater . The results of this monitoring will be reported annually in the Annual Monitoring and Maintenance Report , which will be submitted by 1 April of each year as long as the Notice of Applicability (NOA) is in effect . If at any time , the 246ot separation is not maintained , CVC will notify the Regional Water Quality Control Board in accordance with the NOA and submit a work plan describing how CVC will address the elevated groundwater levels .