- A. Geologic and hydrologic conditions in Maryland require varying well construction standards. For the purposes of this chapter, the State has been divided into five hydrogeologic areas. A map of the approximate hydrogeologic area boundaries is in Regulation .39 of this chapter.
B. The Five Hydrogeologic Areas.
- (1) Hydrogeologic Area 1. The area where the unconfined Quaternary aquifer of the Maryland Coastal Plain is of major importance; the area described in “United States Geological Survey (USGS) Professional Paper 822, Water Resources of the Delmarva Peninsula, 1973” and “Maryland Geological Survey (MGS), Report of Investigation No. 40, The Columbia Aquifer of the Eastern Shore of Maryland, Part 1 Hydrogeology, 1984”, which is incorporated by reference.
- (2) Hydrogeologic Area 2. The area where the confined aquifers of the Maryland Coastal Plain are of major importance as described in “MGS, Open File Report 72-02-1, A User's Guide for the Artesian Aquifers of the Maryland Coastal Plain, 1972”.
- (3) Hydrogeologic Area 3. The rocks of the Maryland Piedmont and Blue Ridge as described in “MGS, Report of Investigation 10, Ground Water Occurrence in the Maryland Piedmont, 1969”, and “MGS, Open File Report 69-02-1, Ground Water Aquifers and Mineral Commodities of Maryland, 1969”, exclusive of the carbonate rocks.
- (4) Hydrogeologic Area 4. The sedimentary rocks of the Maryland Appalachian Highlands and Valley and Ridge Provinces, exclusive of carbonate rocks, as described in the references listed in Hydrogeologic Area 3.
- (5) Hydrogeologic Area 5. The carbonate rocks as defined by the “Maryland Geological Survey, Geologic Map of Maryland”, Scale: 1:250,000 dated 1968.
Authority: Environment Article, §§9-1305 and 9-1305.1, Annotated Code of Maryland
Effective date: November 28, 1980 (7:24 Md. R. 2257)
Regulations .02J and .07B, C, D, G, J, and N amended effective March 1, 1982 (9:4 Md. R. 331)
Regulations .07Q and .09D adopted effective August 31, 1981 (8:17 Md. R. 1420)
Regulation .09C and D amended as an emergency provision effective May 26, 1983 (10:12 Md. R. 1070), emergency status expired September 26, 1983
Regulation .09C and D amended and E adopted effective December 5, 1983 (10:24 Md. R. 2189)
Map recodified as Regulation .13
Chapter recodified from COMAR 10.17.13 to COMAR 26.04.04
Regulation .07D amended as an emergency provision effective November 5, 2007 (34:26 Md. R. 2260); emergency status expired May 3, 2008
Regulation .09B amended effective September 2, 2002 (29:17 Md. R. 1382)
Regulation .09B-1, F, and G adopted effective November 25, 1991 (18:23 Md. R. 2493)
Regulation .12D amended effective October 26, 1992 (19:21 Md. R. 1894)
Regulation .12F amended effective November 25, 1991 (18:23 Md. R. 2493)
Regulations .01—.13 repealed and new Regulations .01—.39 adopted effective January 19, 2015 (42:01 Md. R. 19)