Mr. Joe B. Sanders Cw Subject: ESTIMATED WEIGHTS OF CONSTRUCTION MATERIALS, — QFERATIONS.CASTLE, REDWING,AND BARDTACKI June 29, 1959 - Page 2 the summarydoes” not’ tncliide®“aser“firnishea haterials,- exceptStation ah. REDWING, Whichincludes user-furnished ‘7-inch tubing and aluminum thrust ring, put ‘does notincludé vactium pumps ‘and gas ballast equipment. Station 24 tabulation for iron and steel also includes steel to within 400 feet of GZ. _ ; The information for composition of the CASTLE Station was contained in a letter ~ from Mr.‘ J. Me Lloyd to Mr. Pe W. Spain, dated 18 May 1954, and includes Stations The information for éomposition of the REDWING Stations was taken from a tabula- tion submitted in a confidential letter from H&N to Mr. P. W. Spain, dated April 9, 1956. _(H&N Number 343). The HARDTACKI’ tabulation appears on confidential Drawing J/s 90-005-54, dated August 7,° 1958, which was transmitted to Mr. Rea Blossom by H&N LA-9500, dated October 20, 1958, Crater informationis frou survey ‘data at the H&N Resident Engineer's office, EPG. Quantities of reinforcing steel orconcrete for foundations have not bee includedT“Chemical canposition of” cratered materialhasnotbeen determined,1 but the following Information hasbeen taken fromGeological Survey Professional Paper, 260-A "Geology of Bikini and.Nearby Atolls," dated 1954, pages 84-86: Calcium Carbonate, 87.7% to 98.6% with the minimm reading at veeme a nes . 15.5% depth. and the maximm at 340" depth. Magnesium Carbonate, 8.3% to 0.7% withmaximm at 15.5' depth wees been ne . and the minimm at 340' depth. From other.samples at Bikini, spectrographic analyses indicated the following Ma ~ 0004 to’ .003% ..Na, -_.07 to 1.0% However, “the spectrographic analysesof carbonates are statedin the paper as "not considered to be as accurate asthose of some other types of rock," and = =~ *two’ samples---from 330 feet and---from 635 feet, contain more silicon, aluminum, iron, manganese and sodium than other samples, but these elements are possibly due-to contamination by drilling ma." Weshall be gladto have samples taken and analyzed to present more conclusive information if desired. Very truly yours, 1/ It is not possible to incorpdrate the information provided into predictions of induced activity without this date. a COPIED/DOE LANL RC Bobet 3 : HOLMES & NARVER, INC /s/ S. P. Howell, Manager Engineering & Construction pt GS