112,415 93,953 106,571 154,527 104,556 148,828 184,804 136,702 Month January February March April May June July August September October November December 22 1,479 3,019 5,702 6,842 5,032 59,671 86,125 73,379 68,199 121,313 113,403 96,657 99,663 109,036 130,907 184,585 152,995 169,965 143,371 145,598 126,493 141,747 131,573 TABLE 3: ANNUAL LEACHATE FLOW Year 2014 2015 2016 2017 2018 Total Leachate Flow 28,450,308 28,921,038 16,661,417 49,740,120 54,445,356 Daily Average Leachate Flow (gal/day) 77,867 79,027 45,349 136,049 149,086 The total sewage/leachate discharged to the Ossining Wastewater Treatment Facility for the 5-year reporting period was 178,218,239 gallons, which results in a monthly average flow of 2,970,304 gallons, or a daily average flow rate of 97,600 gallons/day. 3.10 PUMPING STATION SERVICE AND MAINTENANCE Unanticipated service and maintenance at the pump stations has been minimal during the reporting period. However, some specific tasks were performed as detailed previously in Section 3.4 of this Report. Observations were made by WCDEF personnel on a daily basis to confirm operating performance of the pump stations. X:\PROJECTS\WCDEF\190446 - Croton LF Periodic Review Report\2019 PPR Report\2019 PRR rpt 2019-06-14.docx 15 3.11 RECOMMENDATIONS AND CONCLUSIONS The following overall PRR recommendations and conclusions result from the information contained in the above referenced reports. Compliance with Site Management Plans Based on Cornerstone’s review of documentation available and the information provided, the requirements set forth in the SM plan for the Site have been met during the reporting period of this PRR. Recommendations and Future Periodic Review Report Submittals The recommendations for the site are to continue the current maintenance and monitoring programs in accordance with the governing SM plan, and maintain the existing IC/EC. Environmental monitoring data will continue to be evaluated as it is received and if additional remedial actions are deemed appropriate, separate recommendations will be prepared for submittal in the next 5-year PRR to the NYSDEC. The certification of Institutional Controls and Engineering Controls is included in Appendix A of this Report. X:\PROJECTS\WCDEF\190446 - Croton LF Periodic Review Report\2019 PPR Report\2019 PRR rpt 2019-06-14.docx 16 LIMITATIONS The work product included in the attached was undertaken in full conformity with generally accepted professional consulting principles and practices and to the fullest extent as allowed by law we expressly disclaim all warranties, express or implied, including warranties of merchantability or fitness for a particular purpose. The work product was completed in full conformity with the contract with our client and this document is solely for the use and reliance of our client (unless previously agreed upon that a third party could rely on the work product) and any reliance on this work product by an unapproved outside party is at such party's risk. The work product herein (including opinions, conclusions, suggestions, etc.) was prepared based on the situations and circumstances as found at the time, location, scope and goal of our performance and thus should be relied upon and used by our client recognizing these considerations and limitations. Cornerstone shall not be liable for the consequences of any change in environmental standards, practices, or regulations following the completion of our work and there is no warrant to the veracity of information provided by third parties, or the partial utilization of this work product. X:\PROJECTS\WCDEF\190446 - Croton LF Periodic Review Report\2019 PPR Report\2019 PRR rpt 2019-06-14.docx 17 FIGURES X:\PROJECTS\WCDEF\190446 - Croton LF Periodic Review Report\2019 PPR Report\2019 PRR rpt 2019-06-14.docx 18 SITE 1 PLLC VICINITY MAP HAVERSTRAW BAY 2 PLLC EXISTING SITE PLAN APPENDIX A NYSDEC LETTER WITH INSTITUTIONAL CONTROLS AND ENGINEERING CONTROLS (IC/EC) CERTIFICATION X:\PROJECTS\WCDEF\190446 - Croton LF Periodic Review Report\2019 PPR Report\2019 PRR rpt 2019-06-14.docx 19 APPENDIX B WORK AND ACTIVITY PERFORMED X:\PROJECTS\WCDEF\190446 - Croton LF Periodic Review Report\2019 PPR Report\2019 PRR rpt 2019-06-14.docx 20 2014 Work and Activity Performed January 7, 2014 • January 9, 2014 January 27-30, 2014 February 4, 2014 • • • February 7, 2014 • February 26, 2014 • March 5, 2014 • • March 14-19, 2014 March 20, 2014 • • March 24-27, 2014 April 1, 2014 • • • • • • • April 2, 2014 April 8, 2014 April 17, 2014 April 21, 2014 • • April 22, 2014 • • April 25, 2014 May 6,2014 May 12, 2014 • • • • Flare shut down due to power failure; resumed Flare at 7am on auto mode. Personnel monitored flare start up. Collected data for CLF and RR1. Collected data for CLF and RR1. Flare shut down at 10:45am to 1:15pm. While Flare was shut down the flow meter was replaced. Flare shut down to install new PLC by Pat Cullen and Pat Doresy. The Flare was shut down from 9:45am to 11:45am. Meeting with Mario and Lou to discuss mowing at CLF and RR1. Collected data for CLF and RR1. Turned Flare off at 9:50am to Grease blowers and exercised valves. Also changed 2032