When using cement grout as the sealing material in a well, it must meet the following requirements:

1. (1) Cement grout used to seal a well shall be composed of a uniformly mixed slurry of Portland cement or High Early Strength Type III Portland cement and potable water, or High-alumina cement and potable water, mixed in the following proportions (Type of Cement — Gallons of Water Per Sack of Dry Cement, respectively):

   1. (a) Portland Cement — 4-1/2 to 6;
   2. (b) High Early Strength Type III Portland Cement — 5-1/2 to 6-1/2;
   3. (c) High-alumina Cement — 4-1/2 to 6.
2. (2) Additives to increase fluidity, reduce shrinkage, or control time of set may be used in a cement grout mixture. Expanding agents such as aluminum powder may be used at a rate not exceeding 0.075 ounce (one level teaspoonful) per sack of dry cement. The powder shall not contain polishing agents. The addition of bentonite clay to a cement grout mixture is permissible but shall not in any case exceed five percent (5%) by weight of dry cement. Calcium chloride may be added to a Portland cement grout to accelerate the set but shall not exceed two pounds per sack of dry cement. High-alumina cement and Portland cement of any type shall not be mixed together for use in a well.
3. (3) Cement types other than those set forth herein shall not be used as a sealing material in a well except upon written approval of the Director of the Water Resources Department.
4. (4) In no case shall sand or aggregate be added to cement grout seal mixtures.
5. (5) The volume of sealing material required shall be calculated prior to seal installation. The calculated volume and actual volume used shall be reported on the water supply well report.

Statutory/Other Authority

ORS 183, 536, 537 & 540

History

WRD 3-2014, f. & cert. ef. 11-25-14
WRD 7-2001, f. & cert. ef. 11-15-01
WRD 13-1986, f. 10-7-86, ef. 11-1-86, Renumbered from 690-061-0086
WRD 9-1978, f. 12-12-78, ef. 1-1-79