In planning for construction of all school facilities, a school district shall estimate capacity needs on the basis of the following:

(1) A three or five-year cohort survival enrollment projection for growth districts, whichever is greater;

(2) A three or five-year cohort survival enrollment projection for a declining district, whichever is lesser;

(3) Actual enrollment of preschool students with developmental disabilities; and

(4) Supplemental information regarding district growth factors which may include but not be limited to the following types of information:

(a) County live birth rates;

(b) New housing starts;

(c) Utility/telephone hookups; and

(d) Economic/industrial expansion.

(5) For the purposes of this section, kindergarten students and students with developmental disabilities shall be counted as provided under WAC 392-343-035 and all other October student headcount (kindergarten through grade twelve students) shall be based on enrollment reported on the October P-223 form reported on or before the October due date. The headcount shall exclude alternative learning experience (ALE) students who reside outside the school district, as reported on the office of superintendent of public instruction (OSPI) school apportionment and financial services October alternative learning experience monthly enrollment report on or before the November due date.

In accordance with chapter 28A.525 RCW, as an alternative to the above headcount a school district may request the OSPI to increase the headcount by the difference in the number of ALE students, residing outside the district who physically attend the school for more than one hour per day, three days or more per week, compared to the number of ALE students, residing inside the district, that did not physically attend the school for more than one hour per day, three days or more per week.

Any school district requesting the above alternative calculation must do so on an OSPI school facilities and organization alternative calculation for alternative learning students form on or before December 31st of that year. For purposes of this section (ALE) students shall be defined as in RCW 28A.150.325.