b. Survey Frequency . Between October 1962 and December 1972, 1,760 pro- 

 files were obtained from 90 surveys. The survey frequency varied significantly 

 throughout this period from both year to year and season to season (Fig. 18). 

 Each profile line was surveyed 25 times in 1963, but only 4 times in 1966. 

 Most surveys were made in the fall and winter; relatively few were made in the 

 summer. 



S ^ 10 



llTHp-rrpn rp-n-fl r|"U l]"UJ1-i-rf1 



to 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 "1972 



Year 



15r 



§:£ 10 



CO 5 





Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. 



Month 



Figure 18. BEP survey frequency, Ludlam Beach, New Jersey. 



c. Survey Procedure. Profile lines were surveyed using the transit and 

 stadia method (Fig. 19). The Philadelphia District survey crews performed all 

 survey work except for a period in 1963 and 1964 when it was contracted to 

 Mauzy, Morrow ^ Associates of Lakewood, New Jersey. 



31 



