SSc1 Path 4 Heat Island Effect- Nonroof

To clarify: 1.) Can I use a combination of underground parking stalls AND light colored pavement (SRI - 35 typical new gray concrete) AND landscape (tree) shading to achieve this point? 2.) It looks like I cannot use the underground if I go with the option of Shading of Nonroof Impervious Surfaces 3.) The underground parking option requires 50% of all parking stalls for the site, HOWEVER, the other option states 30% of all impervious surfaces area. Please clarify. Ideally, I would like to use the underground parking in combination with the landscape shading and SRI 29 rated hardscape for a total of 30%, but it seems to good to be true!