HomeMy WebLinkAboutC9.1_Storm Drain Details V1E
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SAND AND GREASE TRAP
(ACHD BMP #01). SEE
DETAIL 2 THIS SHEET.
OVEREXCAVATE A MINIMUM OF 2' INTO FREE
DRAINING MATERIAL (SEE TABLE FOR PERC
RATE) AND BACKFILL WITH 6" MINUS PIT
RUN OR ASTM C33 FILTER SAND
SAND AND GREASE TRAP
(ACHD BMP #01). SEE
DETAIL 2 THIS SHEET.
INLET PIPE PER PLAN
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50' MIN.
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OBSERVATION WELL
PER ACHD SD-627
OBSERVATION WELL
PER ACHD SD-627
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • C • • • • •
18" ADS, HOPE OR
PVC PERFORATED
PIPE. PERFORATIONS
IN TOP HALF ONLY.
ASTM C33
FILTER SAND
PROFILE VIEW
PORTION OF OBSERVATION WELL LYING
IN DRAINAGE SAND MUST BE WRAPPED
WITH TYPE I DRAINAGE GEOTEXTILE PER
ISPWC SECTION 2050.
18" PERFORATED PIPE WITH PERFORATIONS TOP HALF ONLY
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WRAP TOP AND SIDES OF TRENCH IN
NON -WOVEN FILTER FABRIC. SEAMS
SHALL OVERLAP A MINIMUM OF 1'.
ESTIMATED HIGH
GROUNDWATER
NOT ENCOUNTERED
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12" INLET PIPE PER PLAN
SAND AND GREASE TRAP (BOISE
VAULT OR APPROVED EQUAL WITH
BAFFLES) SIZE PER TABLE
12" INLET PIPE PER PLAN
PROFILE VIEW
PLAN VIEW
RINGS AS REQUIRED
X.) SET RIM FLUSH
DISHED GRADE
B" OUTLET PIPE PER PLAN
NO DETAIL 1 THIS SHEET
24" DIA. TRAFFIC RATED FRAME AND
COVER PER
1TLET PIPE PER PLAN
AND DETAIL 1 THIS SHEET
SAND AND GREASE TRAP TABLE
STRUCTURE NAME
SIZE
RIM ELEV.
INV. ELEV. IN
BAFFLE "B" ELEV.
BAFFLE "C" ELEV.
INV. ELEV. OUT
SG TRAP #1-1
1000 GALLON
2761.03'
2755.15'
2755.05'
2754.55'
2754.30'
SG TRAP #2-1
1500 GALLON
2763.21'
2757.00'
2756.90'
2756.40'
2756.15'
SG TRAP #3-1
1000 GALLON
2764.45'
2760.85'
2760.75'
2760.25'
2760.00'
SAND AND GREASE TRAP DETAIL (ACHD BMP #01) r2_�
SCALE: NOT TO SCALE C9.1
PLAN VIEW 5' MIN.
OBSERVATION WELL
PER ACHD SD-627
NOTES
1. ACCORDING TO THE PROJECT GEOTECHNICAL REPORT PREPARED BY ATLAS TECHNICAL CONSULTANTS LLC
DATED SEPTEMBER 15, 2020, GROUNDWATER WAS NOT ENCOUNTERED DURING GEOTECHNICAL
EXPLORATION. CONTRACTOR SHALL NOTIFY THE ENGINEER IMMEDIATELY IF GROUNDWATER IS
ENCOUNTERED WITHIN 3-FEET OF THE BOTTOM DESIGN ELEVATION FROM ANY INFILTRATION FACILITY
AND/OR IF IT IS HIGHER THAN ANTICIPATED.
2. REFER TO ACHD BMP 20 FOR ADDITIONAL INFORMATION REGARDING SEEPAGE BED CONSTRUCTION.
3. ACHD STAFF MUST VERIFY FACILITY INFILTRATION RATE AFTER FACILITY IS FULLY EXCAVATED.
4. IF ROCK IS ENCOUNTERED DURING FACILITY EXCAVATION, CONTRACTOR TO HAVE TEST PERFORMED BY
SOILS ENGINEER AFTER SEEPAGE TRENCH IS FULLY EXCAVATED. IF THE PERCOLATION TEST IS LESS
THAN SPECIFIED BY THE SOILS REPORT AND ENGINEER, CONTRACTOR MAY NEED TO BLAST OR BORE TO
CREATE CONDUIT FOR DRAINAGE TO OCCUR OR REDESIGN THE SYSTEM TO ACHIEVE THE REQUIRED
INFILTRATION.
ELECTRONIC MARKERS PLACED ON
CORNER OF FACILITY, TYP.
COORDINATE WITH ACHD INSPECTION
STAFF FOR PLACEMENT OF MARKERS
DURING CONSTRUCTION PRIOR TO
BACKFILLING.
SEEPAGE BED TABLE
SEEPAGE BED NO.
SEEPAGE BED DIMENSIONS
TOP OF ROCK ELEV.
BOTTOM OF ROCK ELEV.
BOTTOM OF SAND ELEV.
PERF. PIPE INVERT
PERF. PIPE DIAMETER
100-YEAR VOLUME
DESIGN INFILTRATION RATE
ACHD SEEPAGE BED #1
20'Wx93'Lx10'D
2759.00'
2749.00'
2747.50'
2754.30' (18")
2755.75' (12")
(1) 18"
(1) 12"
8,720 CF
8 IN/HR
ACHD SEEPAGE BED #2
15'Wx65'Lx10'D
2760.50'
2750.50'
2749.00'
2756.15'
(1) 18"
4,534 CF
8 IN/HR
ACHD SEEPAGE BED #3
14'Wx62'Lx11'D
2763.00'
2753.00'
2751.50'
2760.00'
(1) 18"
4,426 CF
8 IN/HR
SEEPAGE BED DETAIL (ACHD BMP #20) 1
SCALE: NOT TO SCALE C9.1
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DESIGNED:
C. GRAHAM
DRAWN:
L. HAASE
CHECKED:
C. GRAHAM
APPROVED:
C. GRAHAM
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PREPARED FOR:
G20 LLC
PO BOX 593
EAGLE, ID 83616
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CSW PROJECT NO. 22001
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DRAWING DATE 06/02/2022
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