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not be permitted. Dispersing agents (such as phosphates) or acids shall not <br /> be used. There shall be no attempt made to chemically disinfect the well. <br /> The rigs, drill tools, and associated equipment shall be cleaned with steam <br /> and washed and rinsed with a decontaminating liquid prior to commencement of <br /> drilling at each well and boring location. It is expressly required that <br /> toxic and/or contaminating substances shall not be used during any part of the <br /> drilling, well installation or well development processes. All drilling ac- <br /> tivities and methods shall be sufficient to positively prohibit the introduc- <br /> tion of contaminants from one water bearing stratum to another via the well <br /> bore. <br /> 9.3.3 Well Design. <br /> 9.3.3.1 Boring Diameter. The boring shall be of sufficient diameter to <br /> permit at least two (2) inches of annular space between the boring wall and <br /> all sides of the centered riser and screen. <br /> 9.3.3.2 Well Riser and Screen. <br /> 9.3.3.2.1 Riser. Well riser shall consist of new threaded, flush joint, <br /> Schedule 40 Poly Vinyl Chloride (PVC) pipe with at least a nominal four (4) <br /> inch diameter. Well risers shall, as a minimum, conform to the requirements <br /> of ASTM-D 1785 Schedule 40 pipe and shall bear marking that will identify the <br /> material as that .:.iich is specified. <br /> 9.3.3.2.2 Screen. The well screen shall be a minimum of ten (10) feet <br /> in length and shall be constructed of PVC material similar to the well riser. <br /> The screen shall be noncontaminating, factory constructed and of "continuous <br /> wrap" or "mill-slot" design. Field slotted or cut screen is not permitted. <br /> The slot size shall be determined by the AE and designed to be compatible <br /> with aquifer and gravel pack material. The AE shall provide a sieve analysis <br /> of one or more representative samples of the aquifer material in which the <br /> screen is placed and which demonstrates that the screen is compatible with the <br /> aquifer material. The sieve analysis shall be conducted in accordance with <br /> ASTM C 117 and C 136 and results shall be submitted to the CO with the field <br /> boring logs. <br /> 9.3.3.2.3 Screen Location. The AE shall have the responsibility of <br /> placing the well screen in the appropriate location in the bore hole to accom- <br /> modate fluctuation in the water table, so that the completed injection well <br /> functions satisfactorily. <br /> AA-28 <br />