HomeMy WebLinkAboutCT 2018-0005; VILLAGE WALK; PRELIMINARY INFILTRATION TESTING STORM WATER MANAGEMENT; 2018-01-26310.968.2999
January 26, 2018
TMS Highland Investments, LLC
Tony Sfreddo
29250 Paseo Sedano
San Juan Capistrano, California 92675
tsfreddo@icloud.com
Subject:
stratatech@yahoo.com
w.o. 284018-1
MAR O 2 2018
CiTY OF CARLSS,~.D
F< .... i:\NNING D!V!s.c;.;
Preliminary Infiltration testing, Storm Water
Management, 341-347 Oak Ave, Carlsbad,
California
Ref: STRATA-TECH, INC.; "Geotechnical Engineering Investigation, Proposed Multi-family
Residential Development, 341-347 Oak Ave, Carlsbad, California", January 18, 2018
Gentlemen:
In accordance with your authorization and terms of our contract STRATA-TECH, Inc. is pleased
to submit the results of our storm water infiltration testing.
Falling head percolation testing was performed in two Pits at the locations shown on the attached
grading plan.
The soils encountered consist primarily of beach deposits Orange-yellow, silty, fn sand, Sand, fn
to 15-feet. Logs of the Pits are attached. The percolation pit bottoms are substantially separated
from seasonal groundwater. Ground water was encountered in adjacent borings that were dry to
15 feet. Groundwater is not expected to rise within 15 feet from the proposed development.
. ,.
STRATA-TECH,INC.
13E •C •NSULTANTS
TMS Highland Investments, LLC.
Preliminary Storm Water Infiltration Testing
2 January26 , 2018
341-347 Oak Ave. Carlsbad
Testing was performed in 5-foot dry wells consisting of 6-inch slotted well screen with .020"
openings in an 8" diameter hand borings having the annular space packed with #3 Monterey filter
sand to prevent caving. Hand borings were prepared on 12/27 /17.
The cased pits were filled with water for pre soak on 12/27/17 and the percolation test conducted
immediately following the pre soak which confirmed sand condition criteria as outlined in
OC_TGD_5-19-l 1AppendixVII.
The testing consisted of filling each 5-foot pit with water to within 24-inches of the surface and
allowing it to seep for IO min intervals and repeatedly filling the test pit and measuring the
stabilized rate at the end of 6th cycle. The drop between successive measurements was recorded for
each pit and is the basis for the calculated infiltration rate.
The lowest calculated infiltration rate of 9.5 inch/Hr. may be used by the design civil engineer for
the infiltration system design for the subject site. When a conservative factor of safety, FS = 3 is
applied the infiltration rate becomes 3.2 in/Hr.
At the completion of testing the well screens were pulled and remaining holes filled with native soil
and tamped.
AGENCY REVIEW
All soil, geologic and structural aspects of the proposed development are subject to the review and
approval of the governing agency(s). It should be recognized that the governing agency (s) can
dictate the manner in which the project proceeds. They could approve or deny any aspect of the
proposed improvements and/or could dictate which foundation and grading options are acceptable.
Supplemental geotechnical consulting in response to agency requests for additional information
could be required and will be charged on a time and materials basis.
'
STRATA-TECH,INC.
13ECICCINSULTANTS
lMS Highland Investments, LLC.
Preliminary Storm Water Infiltration Testing
3 January26 , 2018
341-347 Oak Ave. Carlsbad
This report is subject to review by the controlling authorities for this project
The work performed was carried out in accordance with acceptable geotechnical principles
common to the local area in which we practice. We make no other warranties, either expressed or
implied.
Respectfully submitted:
STRATA-TECH, INC.
Roland Acufia, PG
President
Enclosures:
Appendix; A
Plate I -Pit/Pere Location Map
Plate 2 -Test Pit Logs
Plate 3 -Test Results
Larry Finley
RCE46606
VICINITY MAP
Geotechnical Engineering Investigation
341-347 Oak Ave
Carlsbad, California
STRATA -TECH, INC.
Work Order 284018
Plate No.
LOCAL GEOLOGY
Geotechnical Engineering Investigation
341-347 Oak Ave
Carlsbad, California
STRATA -TECH, INC.
Work Order 284018
Plate No. 1
STRATA-TECH,INC.
GEOCONSULTANTS
APENDIX A
Plot Plan, Boring Logs and Test Results
RECORD OF SUBSURFACE EXPLORATION
~-~ -Date Preliminary Geotechnical Investigation <I) ~~ t Q) C
C. "'C :::i ~ Q) u .r:. 341-347 Oak ave E 1ii "O o,s 15.. (1)
Cl) ·o ~ ~ Q)
~~ 0 0 Carlsbad, California
u B Work Order 284018 Test Pit No. 1
Description of Earth Materials
0 -Orange-Brown, fn sand
2 -Orange-brown , fn-med Sand,w/trace of clay, dry
3.2 113 4 -
6 -Orange-tan, fn-med , silty sand, dry
8 -Bottom at 8' Feet. No Ground Water. No Caving.
RECORD OF SUBSURFACE EXPLORATION
~--~ -Date 1/0/1900 Preliminary Geotechnical Investigation
<I)
0~ ~ ~ Q) C
C. "'C .3 ~ Q) u .r:. 341-347 Oak ave E (/) "O 0 ,s 15.. (1) ·o ~ ~ Q) Cl) ~~ 0 0 Carlsbad, California
u B Work Order 284018 Test Pit No. 2
DescriPtion of Earth Materials
0 -Brown, Silty Sand w/ Roots
5 -Orange-Brown, fn-med, Sand , dry
7.2 114.1
10 -9.1 113.9 Yellow-Tan Sand , Dense, damp
15 -
Bottom at 15 Feet. No Ground Water. No Caving. -
STRATA -TECH, INC.
BORING LOCATION MAP
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PLATE:2
Percolation Test Dltl Sheet
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