|
Ratto, Sarale and Del Carlo Property
<br /> Page 8 of 9
<br /> Our Project Number: LGS080506G� ,O
<br /> WJk
<br /> May 30, 2008 J
<br /> Table 3
<br /> Summary of Percolation Tests
<br /> Test No. Percolation Percolatio
<br /> ' Test Rate Test Comments
<br /> Date Tested Depth ft. Duration (see notes)
<br /> p ( ) (minutes h)
<br /> P-1 (shallow) 3 28 4-hr Satisfactory
<br /> 4-23-08 percolation rate
<br /> P-2 (shallow) 3.50 4 4-hr Satisfactory
<br /> 4-23-08 percolation rate
<br /> P-3 (shallow) 3.35 4.72 4-hr ; Satisfactory
<br /> 4-23-08 percolation rate
<br /> Note: A satisfactory percolation rate for a"shallow"test is less than or equal to 60 minutes per inch.
<br /> A satisfactory percolation rate for a"deep"test is less than or equal to 30 minutes per inch.
<br /> 6.7 Discussion of Percolation Test Results
<br /> The soils within the sewage disposal areas of the Site have demonstrated a satisfactory
<br /> percolation rate in accordance with the requirements of the EHD for the use of a standard
<br /> septic system.
<br /> 6.8 Discussion of Septic System Sizing
<br /> Groundwater was encountered at approximately five (5) feet below the ground surface. Septic
<br /> system construction utilizing a raised filter bed should follow the San Joaquin County On-Site/
<br /> Wastewater Disposal Standards where applicable.
<br /> 7.0 CONCLUSIONS
<br /> In summary, percolation rates that meet the minimum EHD standards were achieved in the
<br /> proposed septic disposal areas of c of the oposed parcels. Groundwater was encountered
<br /> at approximately five (5) fe -low the g ands bce. The parcels appear suitable for the use
<br /> of a se tic system utilizi a raised filter be"o maintain the San Joaquin County required
<br /> distant from groundwat r level. DB was"not detected in the water sample, Nitrate was
<br /> found t 2.9 rx g/L-NO3, b6low_the_makimum contaminant level (MCL) of 45 mg/L-NO3 set by
<br /> the Unl ed S tes EPA.
<br /> 8.0 LIMITATIONS
<br /> The conclusions of this report are based on the information provided regarding the existing and
<br /> proposed development, the use of the subject property, and the Site conditions as they existed
<br /> at the time we excavated our test holes and performed the percolation tests. It was assumed
<br /> that the test holes and percolation test results are representative of the subsurface conditions in
<br /> the general area.
<br /> Ratto, Sarale and Del Carlo Property Page 9 of 9
<br /> Our Project Number: LGS080506
<br /> May 30, 2008
<br /> Our professional services were performed, our findings obtained, and our conclusions proposed
<br /> in accordance with generally accepted engineering principles and practices. This warranty is in
<br /> lieu of all other warranties either expressed or implied. Test findings and statements of
<br /> professional opinion do not constitute a guarantee or warranty, expressed or implied.
<br /> 9.0 SELECTED REFERENCES
<br /> California Geological Survey (formerly California Division of Mines & Geology), 1991, Geologic
<br /> Map of the San Francisco - San Jose Quadrangle; CDMG Map 5A, Scale 1 : 250,000.
<br /> Crites, R., Tchobanoglous, G., 1998, Small and decentralized wastewater management systems:
<br /> McGraw-Hill series in water resources and environmental engineering, McGraw-Hill
<br /> Boston first edition.
<br /> Hantzshe N., Finnemore, E.J. 1992, Predicating Ground-Water Nitrate-Nitrogen Impacts.
<br /> Groundwater, Vol. 30, No. 4.
<br /> San Joaquin Community Development Department, 2008, www.co.san-joaquin.ca.us.
<br /> San Joaquin County Environmental Health Department, 2003, On-Site Wastewater Disposal
<br /> Standards: San Joaquin County Environmental Health Department, 304 E. Weber
<br /> Avenue, 3rd Floor, Stockton, California.
<br /> San Joaquin County Flood Control and Water Conservation District. Depth to groundwater
<br /> elevation maps for Fall 2003, and Spring 2004. Published biannually, Scale: 1 inch = 2
<br /> miles.
<br /> U.S. Department of Agriculture, Soil Conservation Service, 1992, Soil Survey of San Joaquin
<br /> County, California.
<br /> U. S. Environmental Protection Agency, 2008, http://yosemite.epa.gov
<br /> U.S. Geological Survey, 1968, Lathrop Quadrangle, California, 7.5 Minute Series Topographic
<br /> Map, Scale: 1: 24,000. www.topozone.com.
<br /> --44
<br />..
<br /> 902 Industrial Way•Lodi.CA 95240•209.367.3701 • Fax 209.369.4228 ©2008 Nei!O.Anderson&Associates,Inc
<br />
|