Document 10y51e5jE5dNaQRxKwDXera4a

Notations:- Re Memorandum of April 15 on Field Investigation A. Correction of Error (a) On page 3 of the attachment (Mr. Cholak's memo)j see 4. Service Stations. The total number of observations at 21 service stations, instead of 396, is 756. The cost of analysing 756, rather than 396 filters, will be $7,560 rather than $3,960. The correction of this error adds $3,600 to the estimated cost of this item. (b) On page 10 of main memorandum, see 2. The analysis of samples --- (1) Samples collected - - - - - - - - - - $11,960 + 3,600 = $15,560.00 (2) Samples collected - - - - - - - - - - (a) $9,960.00 + 3,600.00 $13,560.00 (b) $7,960.00 + 3,600.00 = 11,560.00 (c) $5,960.00+3,600.00 = 9,560.00 4. Total Cost - (1) Maximum $22,960.00 + 3,600 (2) Minimum $16,960.00 + 3,600 $26,560.00 $20,560.00 B. Alteration of program O (see pages 3 and 10 of main memorandum) It is now agreed, because of the lack of service stations of < " suitable location and volume of business, that the survey will include 10 stations in San Francisco, 10 in Los Angeles, and 1 in Bakersfield. hi This reduces the total of such personnel, and results in a N9631 proportional reduction in the cost of the analyses of urine and blood, The latter is estimated to be diminished by a sum which will range from $3, 0 0 0 .0 0 and $3,750.00. ^ Thus the overall cost of the survey, considering this revision and the