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ATC Associates Inc. <br /> 1117 Lone Palm Avenue,Suite B <br /> CV)ATC Modesto,California 95351 <br /> 209-579-222-2221 <br /> Fax:209-579-2225 <br /> A S S O C I A T E S I N C . <br /> summarized in Table 2. Calculations mass extraction and vapor emission rates are included in Tables 3 <br /> and 4. <br /> On October 18, 2011, the SVE system was shut off due to a noise complaint after operating for 30.6 <br /> hours. On December 1, 2011, the SVE system was restarted and allowed to operate for approximately <br /> 1.4 hours in order to collect decibel measurements and influent concentration data. Background decibel <br /> measurements collected with a noise dosimeter at locations approximately 30 feet from the SVE unit <br /> while it was shut off ranged from 57.3 to 63.3 decibels. Measurements collected while the SVE unit was <br /> operating ranged from 63.1 to 70.2 decibels. On March 6, 2012, the SVE system was restarted and <br /> configured for timed operation of 12 hours per day. The SVE system ran continuously (12 hours per <br /> day) from March 6 through April 5, 2012. Available operations and maintenance field data and <br /> laboratory data associated with the SVE system are included in Attachment 1. <br /> RECOMENDATIONS <br /> Based on operation data collected during this reporting period, ATC recommends: <br /> • Continued operation of the soil vapor extraction system <br /> • Continued operation of the ozone injection system <br /> • Conducting groundwater monitoring in the second quarter of 2012 to include groundwater <br /> sample collection from EWl, MWI, MW1C, MW2, MW3, MW3C, MW4, MW6A, MW613, <br /> MW6C, MW7B, MW7C, MWIOB, MW11C, and MW12A. Monitoring wells MW1C, MW3C, <br /> MW 1 IC, and MW 12A are recommended to be sampled in order to confirm the results of the last <br /> sampling event which is the only time these wells have been sampled. Following evaluation of <br /> the second quarter 2012 data, a recommendation will be made with regard to future sampling of <br /> these wells. ATC recommends suspending sample collection from MWS, MW7A, MW8, <br /> MW9A,MW9B, MW9C,MW10A, and MW10C. <br /> If you have any questions or require additional information regarding this report, please contact us at <br /> (209) 579-2221. <br /> Respectfully submitted, PpFESS/0 <br /> ATC Associates Inc. IR N9 <br /> Qt�,O .JEANNE <br /> HOMSEY 2� <br /> co <br /> Z5 No. C047410 <br /> Exp,-M443 <br /> Todd Hafner, P.G. Jeanne Homsey,PE ST CIVIL <br /> Senior Geologist CA Professional Engineer#47410 qTF OF CAL�FO� <br /> cc: Mr. Jay McIlrath <br /> Mr. James Barton, RWQCB <br /> Jamar Status Rpt 1 Q 2012 5 <br />