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ARCADIS Ms. Amy Terrell <br /> January 29, 2014 <br /> Results and LNAPL Removal Rate Comparison <br /> Physical Removal from Wells <br /> The volume of LNAPL bailed during each quarterly event and cumulative removed <br /> quantities are summarized in Table 1. Recovered LNAPL volumes ranged from 0.43 <br /> gallon (MW-8A) to 5.74 gallons (MW-06A) per well during 2013. <br /> A total of 18.67 gallons of LNAPL were physically removed from six wells during four <br /> 2013 field events as follows: <br /> • First Quarter 2013 —4.96 gallons <br /> • Second Quarter 2013—2.34 gallons <br /> • Third Quarter 2013 —3.83 gallons <br /> • Fourth Quarter 2013 — 7.54 gallons <br /> The average LNAPL bailing volume was approximately 4.7 gallons per event but the <br /> results appear to be seasonally dependent. <br /> Laboratory Analytical Results-NSZD Removal Rate <br /> NSZD rates over an acre of land and over 0.75 acre (the approximate LNAPL <br /> footprint) are summarized in Table 2 and provided below. Laboratory analytical <br /> reports are included in Appendix A. <br /> First NSZD Sampling Event <br /> Traps were deployed on February 12, 2013 and recovered on February 26, 2013. <br /> Based on the analytical results, NSZD occurred over an acre of land at rates ranging <br /> from approximately 599 to 1,412 gallons/acre/year(1,005 gallons/acre/year <br /> average). <br /> In addition, calculating the rate over the approximate LNAPL footprint (0.75 acre), <br /> NSZD occurred at rates ranging from approximately 449 to 1,059 gallons/0.75 <br /> acre/year (754 gallons/0.75 acre/year average). <br /> Page: <br /> G 9Projects\UPRR Roseville\RC000709_Tracy Mnt Faci1dy\3_DELIVERABLES\2014.01 NSZD Rpt\Tracy ca-Mainl Facility_NSZD Rpt(01-29-14).doc 5/9 '� <br />