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r/ 11 EDMUND G. BnowN Jn. <br /> i4i� <br /> GOVERNOP <br /> l <br /> C a t I I O R M l a <br /> M`FE AEW ROODRIOUE2 <br /> Water Boards � ENVIRONNENIAI PgOiEG LION <br /> Central Valley Regional Water Quality Control Board nn/ <br /> 5 September 2012 Fi�r�ja ?�11 <br /> ON <br /> Mr. Philip Goalwin P�R� Fj��gH <br /> E2C Remediation <br /> 5300 Woodmere Drive, Suite 105 <br /> Bakersfield, CA 93313 <br /> FOURTH QUARTER 2010 GROUNDWATER MONITORING- 90% CLEANUP MILESTONE <br /> ACHIEVEMENT, FORMER BUSY BEE CLEANERS, 40 NORTH MAIN STREET, SAN JOAQUIN <br /> COUNTY <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff has reviewed <br /> the report titled First Quarter 2012 Groundwater Monitoring and Current Remediation Status Report <br /> submitted by E2C dated 23 March 2012. <br /> In a letter dated 23 February 2009, Regional Board staff indicated a minimum of two successive <br /> quarters of groundwater data was needed to demonstrate that a Milestone concentration has been <br /> achieved. <br /> Table 1 shows the 90% reduction milestone concentration (PCE) to be 118 pg/L. Concentrations of <br /> PCE in key wells have been reported as 111 pg/L in the fourth quarter of 2011 and 87 Ng/L in the first <br /> quarter of 2012. Therefore, Central Valley Water Board staff concurs that the 90% reduction milestone <br /> has been achieved. <br /> Table 1 - Sampling results of Key Wells <br /> Baseline I IX-1BB MW-06 MW-1BB MW-4BB MW-5BB MW-6BB MW-7BB MW-9BB MW-19BB Total ARG <br /> PCE(ug/L) 240 55 194 25 80.6 51 340 66 130 1,181.6 0.5 <br /> Future Milestone Analytical Data <br /> Date EXABB MW-06 MW-1BB MW-4BB MW-5BB MW-6BB MW-7BB MW-9BB MW-19BB Total Reduction Reduction Milestone <br /> 9/30/2010 73.0 0.9 55.8 14.2 0.0 0.0 44.2 34.7 3.6 226.4 Milestone % <br /> 12/21/2010 72.0 0.9 16.0 7.0 13.0 32.0 34.0 10.0 6.6 191.5 1,181.1 0 17A <br /> 3/22/2011 69.0 2.0 10.0 15.0 23.0 41.0 55.0 13.0 17.0 245.0 885.8 25 17B <br /> 6/13/2011 37.9 0.6 4.9 7.5 12.1 6.9 19.8 3.2 16.4 109.2 590.6 50 17C <br /> 9/8/2011 31.9 0 4.1 6 8.7 6.5 54 3 10.2 124.4 472.4 60 17D <br /> 12/2/2011 32.6 0 4.4 0 11.5 13.9 38 0 10.7 111.1 354.3 70 17E <br /> 3/13/2012 31 0.74 6.7 2.5 7.6 0.66 22 4.8 11 87.0 236.2 80 17F <br /> 118.1 90 17G <br /> 0.0 100 17H <br /> 0.0 Maintained 171 <br /> KAR_ E. LONGLEY SCD, P.E., CHAIR 1 PAMELA C. CREEDON P.E., BCEE, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive 11200,Rancho Cordova,CA 95670 1 www.waterboards.ca.gov/centralvalley <br /> ��nr.cyct CD-- <br />