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' to a State-certified laboratory All samples were collected according to ESE SOP No 3 All <br /> • well purging and sampling data are included in Appendix E - Sample Collection Logs <br /> 3.3 Surveying <br />' On November 5, 1990, three of the ground water monitoring wells were surveyed for their <br /> locations and elevations An ESE field geologist surveyed each well elevation and location as <br /> well as locations of other site features The surveyed locations were used to develop a working <br /> site plan A reference elevation datum was established by the field geologist at a permanent <br /> location and was assigned an arbitrary elevation of 37 00 feet above mean sea level (AMSL) <br /> An United States Geological Survey (USGS) 7 5-minute topographic map for the Lodi North <br />' Quadrangle was used in assigning the arbitrary elevation of 37 00 feet AMSL This elevation <br /> was used to develop top of casing (TOC) elevations which enabled ESE to calculate ground <br /> water elevations and subsequent ground water gradient and flow direction <br />' On May 28, 1993, ESE surveyed the newly installed ground water monitoring well for location <br /> and TOC elevation in relation to the three pre-existing wells and the reference datum Top of <br /> casing elevations and historical ground water elevations are presented in Table 3 - Historical <br /> Ground Water Elevation Data <br /> 3.4 Laboratory Analytical Methods <br /> • Selected soil samples collected during both phases of drilling were submitted to a State-certified <br />' analytical laboratory and analyzed for Total Petroleum Hydrocarbons as diesel (TPH-D) or Total <br /> Extractable Hydrocarbons (TEH)by California Department of Health Services (DOHS) Method, <br /> LUFT Manual October 1989, and for benzene, toluene, ethylbenzene, and total xylenes (BTEX) <br />' by Environmental Protection Agency (EPA) method 8020 <br />' Ground water samples collected from the wells were submitted under chain of custody <br /> documentation to a State-certified laboratory and analyzed for TPH-D or TEH and BTEX by <br /> California DOHS, LUFT Manual October 1989 and EPA method 8020, respectively <br /> i3.5 Drill Cuttin s and Pure Water Storage <br /> 1 All soil cuttings generated as a result of drilling activities was stored on-site in discrete piles on <br /> plastic sheeting and covered with plastic sheeting pending proper disposal/recycling All ground <br /> water generated from development and sampling activities as well as drilling equipment rinsate <br />' was stored in properly labeled Department of Transportation (DOT) rated 55-gallon drums <br /> pending proper disposal/recycling <br /> 1 <br />' F 169351961CLOSURE RPT 8 Environmental Science&Engineering Inc <br /> 1 <br />