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California0egional Water Quality C trol Board , <br /> Central Valley Region <br /> Katherine HartChairs <br /> Linda S.Adams Edmund G.Brown Jr. <br /> Secretaryfor 11020 Sun Center Drive#200, Rancho Cordova,California 95670-6114 Governor <br /> Environmental Phone(916)464-3291 -FAX(916)464-4645 <br /> Protection http://www.waterboards.ca.gov/centraIva11 f <br /> ECS Y <br /> MAY Z 7 <br /> 13 May 2011 <br /> Mr. Philip Goalwin PERMIT/SEKiOct- <br /> E2C Remediation <br /> 5300 Woodmere Drive, Suite 105 <br /> Bakersfield, CA 93313 <br /> FOURTH QUARTER 2010 GROUNDWATER MONITORING - 80% CLEANUP MILESTONE <br /> ACHIEVEMENT, FORMER BUSY BEE CLEANERS, 40 NORTH MAIN STREET, SAN <br /> JOAQUIN COUNTY <br /> Regional Board staff has reviewed the report titled "Fourth Quarter 2010 Groundwater <br /> Monitoring and Current Remediation Status Report" submitted by E2C dated 1 March 2010. <br /> In a letter dated 23 February 2009, Regional Board staff indicated a minimum of two <br /> successive quarters of groundwater data was needed to demonstrate that a Milestone <br /> concentration has been achieved. <br /> Table 1 shows the 80% reduction milestone concentration (PCE) to be 236 pg/L. <br /> Concentrations of PCE in key wells have been reported as 225 pg/L and 191 pg/L in the <br /> second and third quarters of 2010, respectively. Therefore, Regional Board staff concurs that <br /> the 80% reduction milestone has been achieved. <br /> Table 1 - Sampling results of Key Wells <br /> Baseline EX- MW- MW- MW- MW- MW- MW- MW- MW- Total ARG <br /> 1BB 06 1BB 4BB 5BB 6BB 7BB 9BB 19BB <br /> PCE 240 55 194 25 80.6 51 340 66 130 1,181.6 0.5 <br /> u /L <br /> Future Milestone Anaiyticai Data <br /> Date EX- MW- Mw- MW- MW- MW- I MW- MW- MW- Total Reduction Reduction Milestone <br /> 1BB 06 1BB 4BB 58B 6BB 7BB 9BB 19B6 <br /> Milestone <br /> 9/25/2008 144 24.6 86.4 18.6 39.6 17.6 128 67.8 141 667.6 <br /> 12/29/08 220 4.5 110 15 35 34 150 120 160 848.5 1,181.1 0 17A <br /> 3/26/09 48.1 51.20 13.7 7.0 14.6 30.6 73.0 25.7 27.3 291.2 885.8 25 17B <br /> 5/20/09 64.0 2.2 23.0 13.0 31.0 5.0 130.0 73.0 42.0 383.2 590.6 50 17C <br /> 8/11/09 110 2.3 54 4.9 4.1 41 140 59 13 428.3 472.4 60 17D <br /> 12/22/09 1.3 0.0 3.5 1.1 1 11.0 7.5 19.0 0.7 2.2 46.3 354.3 70 17E <br /> 4/2/10 29.8 2.6 17.0 14.1 23.2 37.6 58.2 24.1 22.3 228.9 236.2 80 17F <br /> 9/29/10 73.0 0.9 54.5 14.2 0.0 0.0 44.2 34.7 3.6 225.1 118.1 90 17G <br /> 12/21/10 72.0 0.9 16.0 7.0 13.0 32.0 34.0 10.0 6.6 191 0.0 100 17H <br /> 0.0 Maintained 171 <br /> California Environmental Protection Agency <br /> p�aRecycled Paper <br />