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-3- (3) Constructed of materials that will not be structurally weakened by the stored motor vehicle fuel; (4) Screened along the entire vertical zone of permeable ma- terial which may be installed between the primary container and the leak interception and detection system; (5) Capable of precluding leakage of any motor vehicle fuel from the casing to areas outside of the leak interception and detection system; and (6) Extended to the ground surface and covered with a locked waterproof cap or enclosed in a surface security structure that will protect the access casing(s) from entry of surface water, accidental damage, unauthorized access, and van- dalism. A secure facility will satisfy the requirements for protection against unauthorized access and vandalism. 2.6 The secondary container shall, at a minimum, encompass the area within the system of vertical planes surrounding the exterior of the primary container. If backfill is placed between the pri- mary and secondary containment, then an evaluation shall be made of the maximum lateral spread of a point leak from the primary containment over the vertical distance between the primary and secondary containment. The secondary containment shall extend an additional distance beyond the vertical planes described above equal to the radius of the lateral spread plus one foot. The secondary containment shall be able to hold 100 percent of the motor vehicle fuel stored in the primary container considering space occupied by fill material. 2.7 The secondary container must be capable of precluding the inflow of the highest ground water anticipated during the life of the underground storage tank into the space between the primary and secondary containers. 2.8 The secondary container and any backfill material between the primary and secondary containers shall be designed and construct- ed to promote gravity drainage of a motor vehicle fuel leak from any part of the primary container to the monitoring location(s). 2.9 Double -walled underground storage tanks where the interstitial space is alarmed and open vaults are exempt from the requirements of Section 2.0, except 2.10. 2.10 The actual location and orientation of the underground storage tank and piping shall be indicated on as -built drawings of the facility. Copies of all drawings and plans shall be submitted to the Anheuser-Busch Companies Environmental Engineering and Resources Department.