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' Atlantic Richfield Company 4 <br /> ARCO 6020 1711 Y_ osennte Avenue,Manteca,CA Apn1 12 2001 <br />' SUMMARY OF FINDINGS <br /> r. <br />' • MtBE concentrations were reported in soil samples collected from <br /> MW-6@25', MW-6@30', and MW-7@35' at 0 657 mg/kg, 0 533 <br /> mg/kg, and 0 109 mglkg, respectively Benzene was reported in one <br />' soil sample (MW-9@30') at a concentration of 0 00978 mg/kg <br /> • MtBE and TAME were reported in the groundwater sample from well <br />' MW-6 at concentrations of 1,760 ppb and 4 79 ppb, respectively (EPA <br /> Method 8260) Other analytes were not detected in the water from <br /> these wells <br />' • Groundwater flow was to the north at a gradient of 0 003 ft/ft <br /> • Approximately 6 tons of stockpiled soil generated during drilling <br />' activities was disposed of at Forward Landfill in Manteca, California <br />' CONCLUSIONS AND RECOMMENDATIONS <br /> Based on the data collected during this assessment, petroleum hydrocarbons have <br /> impacted soil and groundwater beneath the site To confirm concentrations of <br />' hydrocarbons in groundwater and groundwater flow direction, SECOR recommends the <br /> site be placed on a quarterly sampling schedule <br />'• This report presents our understanding of existing conditions at the subject site The <br /> conclusions contained herein are based on the analytical results and professional <br /> judgment, which are in accordance with current standards of professional practice, no <br />' other warranty is expressed of implied SECOR assumes no responsibility for <br /> exploratory borings or data reported by other consultants or contractors If you have any <br />' questions or comments regarding this report, please feel free to call us at (916) 861-0400 <br /> Sincerely, <br /> SECOR International Incorporated <br /> 7 <br /> Rusty Benkosky 111, <br /> 7 lj:' pFplO <br />' Project Manager <br /> ¢ GRECS <br /> BARCLAV <br /> � No 6260 � <br /> I Greg Barclay,'RG 6260 9��oFOQ? <br /> CAi.►F <br /> Senior Geologist <br /> Attachments Figure 1 - Site Location Map <br /> Figure 2 - Groundwater Concentration Map <br /> Figure 3 - Groundwater Elevation Contour Map <br /> 077 42070 330/Well Install report-6020 doc <br />