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Mr George Takemon Project OF90-002 04 <br /> August 21, 1995 <br />' Page 3 <br /> hydrocarbon impact, soil samples for laboratory analyses were not collected from the air <br />' sparge well <br /> On May 17, 1995, a technician from EMCON was on site to develop the air sparge well <br /> (see Appendix A) A groundwater sample collected after well development did not contain <br /> floating product or product sheen <br /> ' <br /> Laboratory rator Methods and Results <br /> ' Soil samples collected from the stockpile were analyzed for total purgeable hydrocarbons <br /> (equivalent to TPHG) with BTEX distinction using Environmental Protection Agency <br /> (EPA) Methods 5030/DHS LUFT18020 In addition, the samples were analyzed for total <br /> lead using EPA Method 305017420, and for reactivity, corrosivity, and ignitabilty <br /> Samples were analyzed at Columbia Analytical Services, Inc , in San Jose, California <br /> (California Department of Health Services Hazardous Waste Testing Laboratory <br /> Certification 1425) Copies of the chain-of-custody records and laboratory analysts reports <br /> are presented in Appendix C <br /> Results of analyses indicated TP-1G and total xylenes concentrations were 0 1 and <br /> 0 005 parts per million (ppm), respectively Total lead was detected at a concentration of <br /> 12 ppm It is our understanding that Teichert properly disposed of the stockpiled soil <br /> GROUNDWATER MONITORING: SECOND QUARTER 1995 <br /> ' <br /> On May 30, 1995, a technician from EMCON measured depth to water, performed <br /> subjective analyses of groundwater, and collected groundwater samples from monitoring <br /> ' wells MW-9 through MW-11, MW-13, and MW-14 for laboratory analyses Well MW-9 <br /> was partially obstructed, therefore, a groundwater grab sample was collected Well <br /> MW-13 was reconstructed to function as an SVE well and was modified to a total depth <br /> of 64 feet bgs Wells MW-1, MW-3, MW-4, and MW-13 were dry during the site visit <br /> Floating product was not observed in any of the monitoring wells Sample locations are <br /> ' shown on Figure 2 <br /> The surveyed elevations and the depth to groundwater measurements, summarized in <br /> ' Table 1, were used to evaluate the potentiometric surface beneath the site The <br /> potentiometnc groundwater surface on May 30, 1995, was toward the northeast with a <br /> hydraulic gradient of 0 001 (see Figure 3) Groundwater elevations increased <br /> approximately 2 04 feet from the previous sampling event (March 1995) <br /> SAC1N 1P1010F90•0F900020 4cs-95 PAS 2 <br />