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**Local conditions will determine depth of seal. Seal to 50 feet if 50 feet or less from a domestic well or from sources of contamination such as septic tanks , sewage disposal fields , livestock corrals , etc . All sealing shall be permanent. b. Sealing Material 1. Neat Cement - 1 bag (94 lbs . ) Portland Cement to 5 to 10 gallons of clean water. 2. Cement Grout - Not more than two (2 ) parts by weight of sand and one (1) part of cement (per bag of cement ) to 5 to 7 gallons of clean water. 3. Quick setting cemen't, retardants to setting and other additives , including; hydrated lime , up to 10% of the volume of cement and bentonite up to 5% may be used. 4. Bentonite clay may be used as sealing material. C. In grouting the annular space, the grout shall be applied in one continuous process , to the initial set when less than 100 sacks are required. The annular seal shall have a nominal thickness of two (2 ) inches . 2. SEALING OFF STRATA • a. Aquifers penetrated that contain poor quality water shall be sealed to prevent contamination. These methods shall be reviewed by the District Health Officer. Sealing shall be done by one of the three methods approved by the Health Department. 3. SURFACE SEAL a. A monolithically poured concrete platform shall be constructed around the top of the well on thoroughly compacted earth , whether the pump is mounted over the well , offset, or is a submersible type. b. On new wells the casing; shall extend a minimum of twelve (12 ) inches above the ground surface or floor. . Upon completion of drilling or until the pump is installeU , a seal or cover shall be provided on top of the casing. 4. SANITARY SEAL: a. ?^Then the pump is mounted directly over the casing, a grout or mastic seal shall be provided to make a water tight ,point between the pump and the base. b. All holes in the base of the pump which open directly into the well shall be sealed. If the pump is offset or submersible a sanitary seal shall be provided between the pipe .column or or other pipes or cables and the casing. c. The seal shall be shaped to prevent retention of water or other foreign materials. (41)