Results of Third Quarter 2015 System Operation and Monitoring, Operable Unit 3 (Former Grumman Settling Ponds) Bethpage Park Soil Gas Containment System, Bethpage, New York NYSDEC ID# 1-30-003A. This report provides NYSDEC with the results of Operable Unit 3 Bethpage Park Soil Gas Containment System (OU3 BPSGCS) operation and monitoring, performed in accordance with the NYSDEC-approved OU3 Soil Gas IRM OM&M Manual (ARCADIS 2009) and the NYSDEC-approved Sampling and Analysis Plan (SAP; ARCADIS 2008). Figure 1 shows the site plan with depressurization and vacuum monitoring well induced vacuum measurements. Tables 1 and 2 summarize OU3 BPSGCS remedial system performance operational data. Tables 3 and 4 provide the validated analytical results of monitoring for this period. Tables 5 and 6 summarize the SCREEN3 model and the maximum allowable stack concentration calculations.