EXPLAIN ANALYZE
  SELECT g.gap_sts AS gap_sts
  FROM usgovt g, risk r
  WHERE
    ST_Intersects(g.geom, r.geom);

Nested Loop  (cost=4.39..64.15 rows=48 width=2) (actual time=164.231..380784.381 rows=48456 loops=1)
   ->  Seq Scan on risk r  (cost=0.00..1.01 rows=1 width=32) (actual time=0.005..0.006 rows=1 loops=1)
   ->  Bitmap Heap Scan on usgovt g  (cost=4.39..63.09 rows=5 width=34) (actual time=164.223..380718.542 rows=48456 loops=1)
         Recheck Cond: (geom && r.geom)
         Filter: _st_intersects(geom, r.geom)
         Rows Removed by Filter: 71027
         Heap Blocks: exact=23099
         ->  Bitmap Index Scan on usgovt_geom_idx  (cost=0.00..4.39 rows=14 width=0) (actual time=24.500..24.500 rows=119483 loops=1)
               Index Cond: (geom && r.geom)
 Planning time: 0.328 ms
 Execution time: 380855.965 ms