HomeMy WebLinkAboutC9.1_Storm Drain Details V10
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18" ADS, HOPE OR
PVC PERFORATED
PINE. PERFORATIONS
ATIONS
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OBSERVATION WELL
PER ACHD SD-627
SAND AND GREASE TRAP
(ACHD BMP #01). SEE ASTM C33
DETAIL 2 THIS SHEET. FILTER SAND
OVEREXCAVATE A MINIMUM OF 2' INTO FREE ��
DRAINING MATERIAL (SEE TABLE FOR PERC �O� ������ �0������� �O� ��� ���� TIVE MA E�IN
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RATE) AND BACKFILL WITH 6" MINUS PIT%
RUN OR 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.
SAND AND GREASE TRAP
(ACHD BMP #01). SEE
DETAIL 2 THIS SHEET.
18" PERFORATED PIPE WITH PERFORATIONS TOP HALF ONLY
O O ■
INLET PIPE PER PLAN
50' MIN. T PLAN VIEW 5' MIN.
OBSERVATION WELL
PER ACHD SD-627
M NOTES
1. ACCORDING TO THE PROJECT GEOTECHNICAL REPORT PREPARED BY ATLAS TECHNICAL CONSULTANTS LLC
OBSERVATION WELL DATED SEPTEMBER 15, 2020, GROUNDWATER WAS NOT ENCOUNTERED DURING GEOTECHNICAL
PER ACHD SD-627 EXPLORATION. CONTACTOR 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 ATE AFTER FACILITY IS FULLY EXCAVATED.
4. IF ROCK IS ENCOUNTERED DURING FACILITY EXCAVATION, CONTACTOR 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, CONTACTOR MAY NEED TO BLAST OR BORE TO
CREATE CONDUIT FOR DRAINAGE TO OCCUR OR REDESIGN THE SYSTEM TO ACHIEVE THE REQUIRED
INFILTRATION.
in
WRAP TOP AND SIDES OF TRENCH IN
NON -WOVEN FILTER FABRIC. SEAMS
SHALL OVERLAP A MINIMUM OF 1'.
ESTIMATED HIGH
GROUNDWATER
1 NOT ENCOUNTERED
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ELECTRONIC MARKERS PLACED ON
CORNER OF FACILITY, TYP.
COORDINATE WITH ACHD INSPECTION
STAFF FOR PLACEMENT OF MARKERS
DURING CONSTRUCTION PRIOR TO
BACKFILLING.
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'
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
SAND AND GREASE TRAP DETAIL (ACHD BMP #01) 00
SCALE: NOT TO SCALE llC9.1
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DESIGNED:
C. GRAHAM
DRAWN:
L. HAASE
CHECKED:
C. GRAHAM
APPROVED:
C. GRAHAM
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PREPARED FOR:
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G20 LLC
PO BOX 593
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EAGLE, ID 83616
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CSW PROJECT NO, 22001
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DRAWING DATE 06/02/2022
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