An inspection was made of three facilities belonging to the Naval Station, San Diego, California during the period August 21 and September 11, 1984. The principal object was to provide that quality of inspection that would allow the engineer inspectors/divers to assess the general physical condition of the piling of the Piers inspected using non-destructive techniques. Typical and critical elements were photographed.
An underwater inspection of Pier J/K at the naval Air Station, North Island, San Diego, California was conducted between June 15, and August 28, 1981. The object was to provide that quality of inspection that would allow the engineer diver to assess the general physical condition of the piling supporting the pier. All of the 791 concrete piles were observed in their entire lengths. Ninety of those piles were cleaned by commercial divers for closer inspection.
An underwater facilities inspection was made of certain facilities at the North Island Naval Air Station, San Diego, California during the period July 20 to August 25, 1984. The assessed facilities were: The Old Air Station Bulkhead, The Carrier Quay Wall or Bulkhead, Pier Bravo, and Pier J/K. A condition of moderate to severe sulphate deterioration of the concrete was found in the piling to such an extent that is is recommended that the pier live load be restricted to 100 psf (pounds per square foot) and truck cranes in excess of 15 tons be prohibited. The pier is adequately supported against earthquake forces (as defined in NavFac P-355) applied perpendicular to its principal axis. However, the piles would not be expected to support the pier in the event of earthquake forces applied parallel to the principal axis.
The general physical condition of Bulkheads and the piling of the Piers at the Naval Training Center, San Diego, California were inspected using non-destructive techniques. Typical and critical elements were photographed. At Pier 548 - The 12 inch square concrete piles supporting the access pier and the 12 inch concrete guide piles of the floating piers are in good condition. At Pier 445 - The 12 inch concrete piles of the access structure are in good condition. The dry pack material at the top of each of these piles is deteriorating and should be replaced. The 30 inch octagonal guide piles of the floating section are in excellent condition. Wooden guide piles should be replaced in four years at an estimated cost of $10,000. The South Boundary Bulkhead is in good condition. Two small voids have formed at construction joints in wall and should be filled with a light cemented material at an estimated cost of $1,000. This reinforced concrete retaining structure at Pier 548 is in good condition but undermined at one end. The void should be filled with cemented material at an estimated cost of $1,000. The wooden retaining structure at Pier 446 is badly dry rot deteriorated and should be replaced within in two years. It is estimated that the cost of replacement will be $76,900.
In september, 1982, an underwater inspection was conducted at the Naval Submarine Base, San Diego, California to assess the condition of the submerged portions of the following structures: Pier 5000 (Sperry Pier), Pier 5002 (Elk River Pier), Pier 5003 (Dixon Pier), Sheet Pile Bulkhead adjacent to Pier 5002. A visual swim-by inspection was made of all facilities under investigation and a more detailed visual and tactile inspection was made of representative components of each facility. Ultrasonic thickness measurements were made of selected steel sheet piles. The detailed inspection included cleaning and scraping of selected areas of the piles and documentation of conditions with color photographs. Generally, the underwater inspection indicated that the submerged portions of the facilities included in this project are in excellent condition. However, Pile 23G or Pier 5000 has been severely damaged above water on the underside of pile cap. This pile should be repaired. A few minor cracks were found in three piles of Pier 5000. The cracks are not significant at this time, but repair of cracks using epoxy is recommended as part of future maintenance operations. It is also recommended that, in the tidal and the splash zone, the protective coating be applied to the steel sheet piling and appurtenances of the Bulkhead adjacent to Pier 5002. Design live loads for each facility are contained in this report. No reductions from these design loads are warranted, except in the area of Pile 236 of Pier 5000 which should be restricted to dead loads only until repaired. Keywords: Underwater inspection; Mooring inspection; Naval Submarine Base; California.
Lima Quay Wall Inspection Summary: The quay wall is constructed of concrete sheet piles, and consists of 3400 lineal feet in addition to the east end. The inspection was referenced to NAVFAC drawing 1343552. The quay wall is in good condition. Heavy marine growth approximately three inches thick was evident from the mud line to the low water mark throughout the length of the wall. (Marine growth consisted primarily of barnacles, mussels and scallops.) Fill material was washing out behind the wall in several noted locations. J-K Pier: Half of the piles on J-K pier were spot inspected (at least four places on each) for a total of 300 piles. Spot inspection was required due to heavy marine growth on the piles. Of the 300 piles inspected 168 have sustained minor to moderate damage. The pier is still considered serviceable but requires major work soon to remain serviceable. The minor damage consisted of small cracks and the moderate damage from cracks 1/2 to 3/4 inch deep and up to 20 feet long. Upon cleaning the piles bankia and torpedos were often present. Age and marine growth have caused spalling and generally softened the concrete. A more thorough inspection would require extensive cleaning. Under the pier, above the waterling were several areas with exposed rebar. Improper preparation of the area to be repaired is a probable cause of the extensive spalling of these ganite repairs. NAVFAC drawing numbers 6003915 and 6003918 germane. Photos showing some of the damage are attached as enclosure (3).
Pier 11A at the Naval Supply Center, San Diego was subjected to a detailed underwater inspection with the objective of assessing the general structural condition of the in-water structural elements. A swim-by visual inspection (designated Level I) was conducted on all 1847 concrete piles and on the total area of the 1820 lineal feet of concrete seawall and bulkhead. A more detailed inspection and cleaning (designated Level II) was performed at 30 sites distributed among three elevations at 10 stations located at 200 foot intervals laterally along the bulkhead. The Level II inspection also included 11% of the bearing and batter piles. Representative samples of all significant deterioration/damage found were photo-documented.
An inspection was made of certain facilities at the Naval Amphibious Base, Coronado (San Diego), California during the period August 6 to August 10, 1984. The principal object of the inspection was to provide that quality of inspection that would allow the engineer inspector/divers to assess the general physical condition of the Bulkheads and piling of the Piers inspected. Each facility was inspected using non-destructive techniques. Typical and critical elements were photographed. The facilities inpected and the recommendations regarding each of them are as follows: Fuel Pier; Piers 1-15 and Bridge; Mammal Pier; Bulkheads 1 and 2; and Marina 1231. The outer piles of the fixed access Pier have been covered with either concrete jackets or plastic wrapping. These covers do not extend to the mudline in all cases leaving bare wood exposed to borer attack. These exposed areas should be covered.
