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BaySeparator (BaySaver Separator) Specifications



The structure shall be designed for H-20 loading traffic and applicable earth loads. The materials
and structural design of the devices shall be per ASTM C857 and ASTM C858.

A. The minimum compressive strength of the concrete in the manhole base, riser, and top
sections shall be 4000 psi.

B. The minimum wall thickness shall be one twelfth of the internal diameter of the riser or
largest cone diameter.

C. Cement shall conform to the requirements for Portland cement of Specification C150.

D. Aggregates shall conform to Specification C33, except that the requirement for gradation
shall not apply.

E. Reinforcement shall consist of wire conforming to Specification A82 or Specification
A496, of wire fabric conforming to Specification A185 or Specification A497, or of bars
of Grade 40 steel conforming to
Specification A615/A615M.

F. The access cover shall be designed for HS20-44 traffic loading and shall provide a
minimum of 30 inch clear opening.

G. All joints shall be waterproofed with wrapped gaskets or sealed with a mastic treatment.

H. Any grout used within the system shall meet the ASTM C 1107 “Standard Specification
for Packaged Dry, Hydraulic-Cement Grout (Non-Shrink)”. Grades A, B and C at a
pourable and plastic consistency at 70oF. CRD C 621 “Corps of Engineers Specification
For Non-Shrink Grout.”

I. Storage manhole connector holes shall be equipped with a seal gasket the meets or exceeds
material specifications of ASTM C-923 or other locally approved methods.


A. Smooth wall pipes within the system, (i.e. tee pipes, connector pipes and down pipes) shall be
constructed of SDR 26 HDPE pipe of standard ASTM F412.

B. Pipe and fitting material shall be high-density polyethylene meeting ASTM D3350 minimum cell
classification 335400C for 12- through 60- inch diameters. The 12- through 60- inch pipe material
shall be Hancor Resin 8TM, which is a slow crack resistant material evaluated using the single
point notched constant tensile load (SP-NCTL) test.

C. Installation shall be in accordance with ASTM D2321 with the exception that minimum cover in
trafficked areas for 4- to 48- inch diameters shall be one-foot and for 60-inch diameters shall be
1.5 ft.

D. Sheet material that makes up the weir plate and bypass plate is to be made of HYA-022. HYA-
022 is a high molecular weight, high density polyethylene resin designed for medium and large
part blow molding. This product exhibits excellent impact strength and stress crack resistance.

E. All pipe joints, particularly the reducer/adaptor to the mainline, shall be installed with an exterior
joining coupler. The joint coupler shall be Polyseal Pipe Coupler as manufactured by Mar-Mac
Manufacturing Company or an approved equal and shall be installed according to the
manufacturer’s recommendations.

F. The connector pipes should be connected with the down pipes using Fernco Flexible Couplings
that have been manufactured to conform to ASTM C-425.


A. An Oil/Water/Grit Separator(s) shall be supplied as defined in the attached drawings. This
stormwater treatment system shall comprise two structures with a connecting separator unit
between them. The system shall be configured such that fine sediments and floatable pollutants
are retained in an off-line structure to prevent resuspension. This separator(s) shall be capable of
separating both suspended solids and oils (hereafter called pollutants) from storm-water at a rate of
no less than 80% removal efficiency at the maximum treatment flow rate.

B. The unit shall be designed to allow for three flow paths, which are used during different flow
rates. These three flow paths shall be defined as the low flow treatment flow path, the maximum
treatment flow path and the peak design flow path, and are described below.

C. During low flow treatment flows the unit shall work by separating the lighter pollutants to the top
of the primary manhole and directing these pollutants to the secondary (storage) manhole, while
heavier suspended solids are directed to the bottom of the primary manhole. In this way the unit
shall be capable of treating all flows up to the low flow treatment flow rate though both manholes
in a primary and secondary treatment process.

D. At higher flows, less than the defined maximum treatment flow rate, the unit shall continue to treat
all fluids in the primary manhole and shall direct those lighter pollutants from the top of the
primary manhole to the storage manhole for a secondary treatment process. At the same time, the
unit shall remove the clean fluids from the center of primary manhole and direct these treated
Rev 8/8/2005 BaySaver Stormwater Treatment System Specifications Page 3 of 3
fluids directly out of the unit. Thus the unit shall avoid re-suspension of previously collected
pollutants in the storage manhole with these clean and treated fluids from the first manhole.

E. At flow rates above the maximum treatment flow the unit shall offer a third flow path that allows
for redirection of the fluids past the storage manhole thus eliminating re-suspension of the
pollutants collected in the storage manhole by these higher flows.

F. The unit shall not possess any elbows of greater than 60° between the primary and storage

G. The unit shall be capable of having the storage manhole completely inspected and maintained
from the top opening without obstruction.

H. No system that does not consist of at least two separate treatment manholes and at least two
treatment flow rates plus a bypass flow rate shall be considered an “or equal.”