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INSPECTION OF 71ELLS 13.5.1. Inspections will be made to ensure that these well standards are being adhered to during all phases of construction, development, sampling, and/or destruction. 13.6. CONTRACTOR REQUIREMIENTS 13.6.1. Constriction, alteration, or destruction of monitoring wells and exploration holes (borings) or shallow exploration holes (borings) installed to monitor hazardous waste facilities, other waste facilities, or underground storage tanks, or land acquisitions, _ . . shall be performed by a C-57 licensed contractor under the direction of a California Registered Professional Engineer, California Registered Geologist, or a California Certified Engineering Geologist, [Sections 6735, 7835, and 7835.1 , Business and Professional Code and Rule 415, Professional and Vocational Regulations]. 13.6.2. Work performed under the direct supervision of a Registered Civil Engineer, Registered Geologist, Registered Environmental Health Specialist, or Registered Environmental Assessor, where the total depth is less than ten feet, is not required to be performed by a C-57 licensed contractor. 13.7. REPORTS 13.7.1. Monitoring well construction, alteration, or destruction reports shall be filed with the California Department of Water Resources in accordance with provisions of Sections 13750 through 13754 (Division 7, Chapter 10, Article 3) of the California Water Code. 13.7.2. Subsurface Investigative Reports and all analytical data obtained in the course of the permitted investigation shall be submitted to the Director, and other appropriate regulatory agencies, upon completion. 13,5. CASING 13.8.1. Casing shall be ASTM, API, and/or AWWA approved. Refer to the State of California Water Well Standards Bulletin 74-81 and 74-90. 13.8.2. Casing should be protected from damage due to sagging and bending, severe impacts and loads, direct sunlight or subjected to freezing temperatures, and potentially harmful chemicals. 13.8.3. All well casing shall be assembled and placed with sufficient care to prevent damage to casing sections and joints. All casing joints above intervals of perforations or screen shall be watertight. Any perforations shall be below the depth specified in Section 13.12. The casing shall be equipped with centering guides or"centralizers",if installed in open borehole, to ensure the even radial thickness of the annular seal and filter pack. 13.8.4. Steel casing may be joined by welds, threads, or threaded couplings. Welding shall be accomplished in accordance with standards of the American Welding Society or the most recent revision of the American Society of Mechanical Engineers Boiler Construction Code. Casing shall be equipped with a "drive shoe" at the lower end if it is driven into place. 17