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CENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD INSPECTION DATE: 5 December 2018 REPORT DATE: 13 December 2018 FACILITY: Harvest-Lathrop Composting Facility DISCHARGER: Harvest Power California, LLC FACILITY LOCATION: 916 Frewert Road, Lathrop FACILITY CONTACT(S): Adam Pescatore, Regulatory Compliance Manager, Harvest Power California, LLC 209 229-6667 INSPECTED BY: Vinoo Jain, P.E., Title 27 Permitting and Mining Unit, RWQCB Matthew Chan, Scientific Aide, Title 27 Permitting and Mining Unit, RWQC Adam Pescatore, Regulatory Compliance Manager, Harvest Power ACCOMPANIED BY: California, LLC George Azevedo, Site Manager, Harvest Power California, LLC 1. BACKGROUND: On 7 February 2018, the Central Valley Regional Water Quality Control Board (Central Valley Water Board) Executive Officer issued a Notice of Applicability (NOA) to Harvest Power California, LLC (the Discharger)for the Harvest-Lathrop Composting Facility (Facility) for coverage under Water Quality Order 2015-0121-DWQ, General Waste Discharge Requirements for Composting Operations (General Order). The NOA required the Discharger by 1 November 2018 to make improvements such as construction/reconstruction of Wastewater Detention Ponds 1 and 2, associated pan lysimeters, and enough of the working pad area, access roads, and drainage ditches that feed the detention ponds to allow the Discharger to operate through the 2018-2019 wet season, including piezometers for groundwater separation monitoring. On 30 April 2018 the Discharger met with Central Valley Water Board staff to discuss a proposed change to their NOA. Due to a potential future expansion of the facility the Discharger proposed moving its Detention Pond #2 from the approved location along the western edge of the facility to the southern end of the facility. On 28 November 2018, the Central Valley Water Board Executive Officer issued an amended Notice of Applicability (NOA) which addressed the relocation of Detention Pond #2. The amended NOA did not change any compliance dates specified in the 7 February 2018 NOA. On 29 November 2018, a conditional approval letter was sent to the Discharger for facility improvements documented in final plans, specifications, and a Construction Quality Assurance Plan. On 5 December 2018, Central Valley Water Board staff performed a site visit of Harvest-Lathrop Composting Facility (TMRTS)to observe current site conditions at the onset of the 2018-2019 wet season and to observe any site improvements the Discharger may have made to meet the 1 November 2018 compliance deadline stated in the 7 February 2018 NOA. 2. OBSERVATIONS AND COMMENTS: On 5 December 2018, Central Valley Water Board staff arrived at the facility at approximately 12:45 PM. The weather was partly cloudy. Photographs were taken at locations shown in Attachment 1. Attachment 2 includes some photographs that were taken. Photo 1 shows rutting of the existing compost working surface due to equipment traffic. The existing compacted soil is unable to provide an all-weather working surface as required by the General Order. The Discharger proposes to make improvements to the working surface by adding a one-foot thick compacted Class II aggregate base Approved: CIWQS Inspection ID# 34673717 Reg Meas ID#408152