r)F.\ CTVIL ENGINEERING tr,^s.s' MATERIAL LABORATORY May 21,2012 South Orange County Community College District 28000 Marguerite Parkway Mission Viejo, CA 92692-3635 Attention: Mr. Walter Rice Subject: PERCOLATION TEST RESULTS Storm Water Retention System Proposed New Science Building Saddleback College Campus Area Mission Viejo, California Project No: 1030.01 Dear Mr. Rice: This report presents the results of the percolation testing performed by the Civil Engineering Material Laboratory (C.E.M. Lab) for the proposed New Science Building at the Saddleback College Campus area, in the City of Mission Viejo, California. PROJECT DESCRIPTION The site proposed for the development is the southerly portion of the existing split level open parking lot 5, located north of Library Drive Road and accessed from College Drive East (Plate 1) To comply with the Standard Urban Storm Water Mitigation Plan (SUSMP) requirements, it is our understanding that an on-site water retention system for the proposed New Science Building is contemplated. PI]RPOSE AND SCOPE The purpose of C.E.M. Lab's investigation was to provide preliminary design percolation rates for the subsurface soils for design of the proposed retention system. The scope of the work performed for this purpose consisted of the following tasks: . The gathering and review of available published and unpublished reports and maps pertaining to the geotechnical conditions at the site and surrounding areas; r Subsurface exploration consisting of drilling seven small-diameter borings, B-1 through B-3; and P-1 through P-4; 2640 Walnut Ave. Unit 6(M" Tustin, CA 92780 Telephone: (800) 303-2365 Fax: (800) 755-4020 Visit us @ cemlabcorp.com
Transcript
r)F.\ CTVIL ENGINEERINGtr,^s.s' MATERIAL LABORATORY
May 21,2012
South Orange County Community College District28000 Marguerite ParkwayMission Viejo, CA 92692-3635
Attention: Mr. Walter Rice
Subject: PERCOLATION TEST RESULTSStorm Water Retention SystemProposed New Science BuildingSaddleback College Campus AreaMission Viejo, California
Project No: 1030.01
Dear Mr. Rice:
This report presents the results of the percolation testing performed by the Civil Engineering
Material Laboratory (C.E.M. Lab) for the proposed New Science Building at the Saddleback
College Campus area, in the City of Mission Viejo, California.
PROJECT DESCRIPTION
The site proposed for the development is the southerly portion of the existing split level open
parking lot 5, located north of Library Drive Road and accessed from College Drive East (Plate 1)
To comply with the Standard Urban Storm Water Mitigation Plan (SUSMP) requirements, it is
our understanding that an on-site water retention system for the proposed New Science Building
is contemplated.
PI]RPOSE AND SCOPE
The purpose of C.E.M. Lab's investigation was to provide preliminary design percolation rates
for the subsurface soils for design of the proposed retention system.
The scope of the work performed for this purpose consisted of the following tasks:
. The gathering and review of available published and unpublished reports and mapspertaining to the geotechnical conditions at the site and surrounding areas;
r Subsurface exploration consisting of drilling seven small-diameter borings, B-1through B-3; and P-1 through P-4;
2640 Walnut Ave. Unit 6(M" Tustin, CA 92780Telephone: (800) 303-2365 Fax: (800) 755-4020
Visit us @ cemlabcorp.com
Project No. 1030.01
May 21"2012Page2 0F')
L/^II.E3. Logging of the borings using visual and tactile methods;
o Collection of samples considered representative of materials encountered,
o Performing percolation testing in borings P-l through P-4;
o Engineering analysis of field data;
. Preparation of this report, summarizing our field investigation, conclusions andpresenting our findings.
FIELD INVESTIGATION
The field investigation was conducted on January 27,2012. Subsurface conditions were explored
by drilling seven small-diameter borings within the area of proposed construction.
The borings were drilled with eight-inch-diameter hollow-stem auger drilling equipment.
Borings B-lthrough B-3 were drilled to depths ranging from 21.5 to 76 feet below existing
ground surface. Borings P- 1 through P-4 were drilled to depths ranging from 6.5 to 13.5 feet
below the existing ground surface. Borings P-l through P-4 were utilized for performing
percolation tests within the upperl0 feet of the proposed building subgrade.
The borings were logged using usual and tactile method by our field engineer. The approximate
location of the soil borings are shown on site boring/percolation test location plan, Plate 2. Logs
of the exploratory borings are presented in Appendix A.
GEOLOGYo Site Geolosy
Information obtained from our subsurface investigation for the site as well as existing
reports for the surrounding buildings, indicated that the site is underlain by fill soils,
alluvium and colluvium deposits, and bedrock of Niguel Formation.
o Artificial Fill
Up to seven feet of fill was encountered in the borings excavated for this project. The fill
soil that was observed was comprised of mottled grayish brown, moist to wet, soft to
medium stiff sandy to silty clay.
o Alluvium & Colluvium Denosits
Three to thirty feet of alluvium and colluvium deposits were encountered in our borings.
The upper 20 feet of deposits generally consisted of reddish brown to gray, moist,
medium dense/stiff clayey sand to sandy clay. Below 20 feet the materials encountered
generally consisted of moist and dense, gravelly sand.
o Niguel Formation
The bedrock encountered at the site was predominantly gray and brown, moist, dense and
hard interbedded layers of sand stone, silts stone and clay stone ofNiguel Formation.
Project No. 1030.01May 21,2012Page 3 g'-'\
L/4.E3o Groundwater
Minor perched groundwater was encountered at 65.5 feet and 38 feet below existing
ground in B-1 and B-2 respectively at the time of drilling.
PERCOLATION TEST PROCEDURE & RESULTSPercolation testing was conducted in borings P-1 through P-4 to determine preliminary design
percolation rates and was performed in substantial compliance with County of Orange Healthcare
Agency "On-Site Sewage Guidelines". The approximate locations of the percolation test holes
are shown on the attached Plate 2.
Percolation test wells were constructed by inserting 2-inch-diameter; perforated PVC pipes in the
borings and backfilling the annular spaces with %-inch gravel to prevent caving during the
percolation tests. Following construction of the percolation test wells (P-i through P-4), the test
wells were filled with water and pre-saturated for a minimum of 24 hour period prior to the start
of percolation testing. The percolation testing was then performed, and consisted of refilling each
test well with water to referenced elevation and taking a reading of drop in water level every one-
halfhour for a period of6 hours. The percolation test results and calculated percolation rates are
presented in Appendix B.
We trust this is the information you require at this time. Please contact us should you need furtherinformation. We appreciate the opportunity to be of continued services.
Respectfully submitted,
No. GE 2199Exp.6F0n2
ohammadPrincipal EG.E.2199
Attachments: AppendixA&B
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APPENDIX A
Log of Borings
LOG OF EXPLORATORY BORING
)roject No. 1027 Boring No: B'1)roject: Saddleback College Boring Location: See Plate 1
New Sciences Building Elevation: 425'MSL)ate: 112712012 DrillType: Hollow Stem Auger
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