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6. REFERENCES <br /> American Society for Testing and Materials (ASTM) D-2487-11. Standard Practice for <br /> Classification of Soils for Engineering Purposes (Unified Soil Classification System). <br /> ASTM, D-2488, Standard Practice for Description and Identification of Soils, Visual- <br /> Manual Procedure. <br /> California Department of Water Resources (DWR), 1990. Water well standards: State of <br /> California. Bulletin Nos. 74-81 and 74-90. <br /> United States Environmental Protection Agency(USEPA),2005. Groundwater Sampling <br /> and Monitoring with Direct Push Technologies, OSWER No. 9200.1-51. August. <br /> 17 <br />