CREATE TABLE table_name_6 (design_flow__lpm_ NUMBER, population_served VARCHAR2, partner VARCHAR2, construction_start VARCHAR2)

What is the total Design flow (LPM) with a Partner of app, a Construction Start of 2008 january, and a Population Served larger than 3500?
SELECT SUM(design_flow__lpm_) FROM table_name_6 WHERE partner = "app" AND construction_start = "2008 january" AND population_served > 3500
SELECT SUM("design_flow__lpm_") FROM "table_name_6" WHERE "2008 january" = "construction_start" AND "app" = "partner" AND "population_served" > 3500