ensure maintenance is carried out by a competent person (someone who has the necessary skills, knowledge and experience to carry out the work safely) 1  maintain plant and equipment regularly â use the manufacturerâs maintenance instructions as a guide, particularly if there are safety-critical features.
HDPE (High Density Polyethylene). 3/4 HDPE will cost about $45.00 for 100' ($0.45/ft), so depending on the amount required can be much cheaper than the previous options. HDPE is used by many municipalities as water supply lines, so it has been tried and tested in underground applications.
The average price for a HDD per GB was $0.075 in 2011, the SSD cost $2.42 per GB. The lowest per GB price for a SSD was $1.50, while HDD could be purchased for $0.053 per GB.