SEPTIC LICENSE FINAL PAPER UPADTED QUESTIONS AND
ANSWERS RATED A+
✔✔What must the installation report include - ✔✔All items listed in the WAC 246-272A-
0265
✔✔What do the minimum separation requirements established in the C1-9.1 apply to -
✔✔All gravity and pressure sewers of 24 inch diameter or less
✔✔What conditions would result in requirements of sewer install being more stringent -
✔✔High ground water - unstable soil conditions - other geotechnical constraints
✔✔What is the minimum horizontal separation between sanitary sewers, reclaimed
water lines, and existing potable water lines - ✔✔10ft
✔✔What is the minimum vertical separation between the bottom of the drinking water
line and the crown of the sewer - ✔✔18 inches
✔✔When local conditions prevent the 10ft horizontal and 18 in vertical what guidelines
need to be followed - ✔✔- laid in a separate trench from water line - constructed of
material equivalent of water main standards and pressure tested
✔✔When local conditions prevent the 10ft horizontal and sewer and water are in the
same trench, what must happen - ✔✔Both water and sewer must be constructed with a
casing pipe of pressure rated pipe designed to withstand minimum static pressure of
150 psi - water line shall be placed on a bench of undisturbed earth with 18in of vertical
separation
✔✔What must happen when a sewer line is crossing a water line at angles including
perpendicular - ✔✔Laid below the water line 18 inches
✔✔When gravity sewers passing under water lines what must happen - ✔✔Constructed
of material described in table C1-3 - pipe crossing under water should be at least 18ft
long and centered on water - standard sewer material cased with steel, iron or pvc with
a DR of 18 or less
✔✔Gravity sewers passing over water lines shall protect water lines by - ✔✔Vertical
separation of 18 inches - adequate structural support to prevent sewer breaking on
water - sewer pipe will be centered and longest length - water line casing equivalent to
C1-9.1.4A
, ✔✔For pressure sewers under water lines the sewer shall only be constructed with -
✔✔Ductile iron pipe or standard pipe in a casing equivalent to the C1-9.1.4A table and
must extend 10ft to either side of crossing
✔✔When will a marina have pump out and shoreside facilities installed - ✔✔Initial
construction or expansion of facilities when the marina is of size and designed to serve
boats 17ft or longer
✔✔What shall pump out and shoreside facilities be designed according to - ✔✔"Design
criteria for pumpout facilities at new or expanded marinas"
✔✔Who established the "design criteria for pump out facilities at new or expanded
marinas" - ✔✔Washington state parks and recreation commission
✔✔What document by the Washington state parks and rec Commision contains the
"design criteria for pumpout facilities at new or expanded marinas" - ✔✔Financial
assistance application for clean vessel funding program
✔✔Where is the requirement for construction of sewage pumpout facilities specified -
✔✔Water quality certification for the for of engineers section 10 permit
✔✔Each marina will prominently display signs stating what - ✔✔It is illegal to discharge
untreated sanitary waste into US waters and direct boaters to the pumpout facilities
✔✔Pipe and joints in stream crossing will be tested where - ✔✔In place
✔✔What must stream crossing pipe and joints do to pass the test - ✔✔- zero infiltration
- protected from hydraulic m, longitudinal, vertical, horizontal loads, erosion, and impact
✔✔When can sewers be laid on piers across rivers ir streams - ✔✔When it can be
demonstrated that there are no other practical alternatives
✔✔How will sewers on piers be constructed compared to sewers entering or crossing
streams - ✔✔The same
✔✔Minimum cover of sewer in stabilized channels is - ✔✔5ft
✔✔Minimum cover of sewer in shifting channels is - ✔✔7ft
✔✔Inverted siphons shall have not less than ____ barrels - ✔✔Two
✔✔What is the minimum pipe size for inverted siphons - ✔✔6inches
ANSWERS RATED A+
✔✔What must the installation report include - ✔✔All items listed in the WAC 246-272A-
0265
✔✔What do the minimum separation requirements established in the C1-9.1 apply to -
✔✔All gravity and pressure sewers of 24 inch diameter or less
✔✔What conditions would result in requirements of sewer install being more stringent -
✔✔High ground water - unstable soil conditions - other geotechnical constraints
✔✔What is the minimum horizontal separation between sanitary sewers, reclaimed
water lines, and existing potable water lines - ✔✔10ft
✔✔What is the minimum vertical separation between the bottom of the drinking water
line and the crown of the sewer - ✔✔18 inches
✔✔When local conditions prevent the 10ft horizontal and 18 in vertical what guidelines
need to be followed - ✔✔- laid in a separate trench from water line - constructed of
material equivalent of water main standards and pressure tested
✔✔When local conditions prevent the 10ft horizontal and sewer and water are in the
same trench, what must happen - ✔✔Both water and sewer must be constructed with a
casing pipe of pressure rated pipe designed to withstand minimum static pressure of
150 psi - water line shall be placed on a bench of undisturbed earth with 18in of vertical
separation
✔✔What must happen when a sewer line is crossing a water line at angles including
perpendicular - ✔✔Laid below the water line 18 inches
✔✔When gravity sewers passing under water lines what must happen - ✔✔Constructed
of material described in table C1-3 - pipe crossing under water should be at least 18ft
long and centered on water - standard sewer material cased with steel, iron or pvc with
a DR of 18 or less
✔✔Gravity sewers passing over water lines shall protect water lines by - ✔✔Vertical
separation of 18 inches - adequate structural support to prevent sewer breaking on
water - sewer pipe will be centered and longest length - water line casing equivalent to
C1-9.1.4A
, ✔✔For pressure sewers under water lines the sewer shall only be constructed with -
✔✔Ductile iron pipe or standard pipe in a casing equivalent to the C1-9.1.4A table and
must extend 10ft to either side of crossing
✔✔When will a marina have pump out and shoreside facilities installed - ✔✔Initial
construction or expansion of facilities when the marina is of size and designed to serve
boats 17ft or longer
✔✔What shall pump out and shoreside facilities be designed according to - ✔✔"Design
criteria for pumpout facilities at new or expanded marinas"
✔✔Who established the "design criteria for pump out facilities at new or expanded
marinas" - ✔✔Washington state parks and recreation commission
✔✔What document by the Washington state parks and rec Commision contains the
"design criteria for pumpout facilities at new or expanded marinas" - ✔✔Financial
assistance application for clean vessel funding program
✔✔Where is the requirement for construction of sewage pumpout facilities specified -
✔✔Water quality certification for the for of engineers section 10 permit
✔✔Each marina will prominently display signs stating what - ✔✔It is illegal to discharge
untreated sanitary waste into US waters and direct boaters to the pumpout facilities
✔✔Pipe and joints in stream crossing will be tested where - ✔✔In place
✔✔What must stream crossing pipe and joints do to pass the test - ✔✔- zero infiltration
- protected from hydraulic m, longitudinal, vertical, horizontal loads, erosion, and impact
✔✔When can sewers be laid on piers across rivers ir streams - ✔✔When it can be
demonstrated that there are no other practical alternatives
✔✔How will sewers on piers be constructed compared to sewers entering or crossing
streams - ✔✔The same
✔✔Minimum cover of sewer in stabilized channels is - ✔✔5ft
✔✔Minimum cover of sewer in shifting channels is - ✔✔7ft
✔✔Inverted siphons shall have not less than ____ barrels - ✔✔Two
✔✔What is the minimum pipe size for inverted siphons - ✔✔6inches
