Frank Streets. This had previously been owned by orchardists Daniel and Edwin Wakeley. At the same time, part of Frank Street which separated these two purchases from the original Pipehead Site was also acquired and still more land was purchased in 1949. The Carpenter's Store in the 1910 survey plan and 1928 aerial photograph was no longer shown in a 1951 aerial photograph. Sherwood Pumping House in the 1928 aerial photo had been removed by 1951 and replaced with new structures which housed Boosting Plants. The 1951 aerial photo shows addition of several auxiliary structures near the 1906 cottage and a large new building with a hipped roof east of the Canal. In the 1950s there were 2 new structures built: a large rectangular building in the north-west portion of the site (between the Canal and Palmer Street) and a smaller rectangular building adjacent the Boosting Plants. Also a new 84" steel pipeline was completed from Prospect to Pipehead in 1958. Aerial photographs show a number of changes made to the site between 1961 and 1970. The boosting stations north of the Basin were removed as was the 1905 workshop building. This was replaced by a Water Pumping Booster c.1967. The second cottage (bought in 1906) and large rectangular 1950s building were demolished and the northwest portion of the site completely cleared. New buildings in this area included the Old Store Building, Storage Shed, Asset Management Workshop and Storage Building. The pre-1950s building with the hipped roof to the east of the Canal was replaced with the present Main Building and Conference Room 3 in c.1967. A residence was built for the Resident Site Operator and so were a Pipeline Control Room, Geological Office and Laboratory and several smaller structures. In the years 1970-8 a Geological Sample Storage Shed and Water Pumping Station No. 189 were built and two of the main screen basins were replaced by a set of 4 rotary drum screens. Supply from Pipehead to Potts Hill was enhanced by the construction of an additional supply tunnel in 1972. A second Geological Sample Storage Shed and "Hellodrome" were built between 1978–86 and No. 1 and No. 2 screening decks were enclosed by a steel shed in 1981. In 1991 the Board decided to move screening operations from Pipehead to Prospect and in 1995 staff were relocated and the screening area was decommissioned. After the screening decks officially