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California r-gional Water Quality Con* l Board '- <br /> Central Valley Region <br /> Karl E. Longley,ScD,P.E.,Chair <br /> Linda S.Adams Arnold <br /> Secretaryjor 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Schwarzenegger <br /> Environmental Phone(916)464-3291 •FAX(916)464-4645 Governor <br /> Protection E „ �;11 ,t, I1 <br /> http://www.waterboards.ca.gov/centralvalley U II �I , <br /> 23 February 2009 FEB 2 5 2009 <br /> ENVIRONNIEN[HEALTH <br /> Mr. Philip Goalwin PERMIT/SERVICES <br /> E2C Remediation <br /> 5300 Woodmere Drive, Suite 105 <br /> Bakersfield, CA 93313 <br /> 25% MILESTONE SAMPLING EVENT, FORMER BUSY BEE CLEANERS, 40 NORTH MAIN <br /> STREET, LODI, SAN JOAQUIN COUNTY <br /> Regional Board staff has reviewed the sampling data submitted by California Laboratory <br /> Services (CLS) on behalf of E2C dated 29 December 2008. The data is included in this letter <br /> as Attachment A. <br /> In July 2008, the Regional Board approved the Final RAP (SVE/GAS and quarterly monitoring) <br /> for the Busy Bee site. Full scale implementation of the RAP commenced in August 2008. <br /> Two separate sampling schedules are required for the site; MRP schedule and Milestone <br /> Sampling schedule. Two rounds of sampling have occurred since the SVE/GAS has been in <br /> operation, one quarterly monitoring event and the 25% Milestone event. Results of the two <br /> events are depicted in Table 1 below. The 25% Milestone sampling event took place 18 <br /> December 2008 with staff from both the Regional Board and E2C. Groundwater samples <br /> were collected from all "key wells" by Greg Brandin (E2C) and Roberto Cervantes (Regional <br /> Board) and were transported to CLS by Roberto Cervantes on 18 December 2008 at 4.50 pm. <br /> Table 1 — Sampling results of Key Wells <br /> Baseline EXABB MW-06 MWABB 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 EX-1 B6 MW-06 MWABB MW4BB MW-5BB MW-6BB MW-7BB MW-9BB MW-19BB Total Reduction Reduction % <br /> Milestone <br /> 9/24/2004 144 24.6 86.4 18.6 39.6 17.6 128 67.8 146 672.6 <br /> 12/18/2004 220 4.5 110 15 35 34 150 120 160 848.5 1,181.1 0 <br /> -_ -_ -- <br /> 885.8 25 <br /> 590.6 50 <br /> 472.4 60 <br /> 354.3 70 <br /> 236.2 80 <br /> California Environmental Protection Agency <br /> C3 Rec.trled Paper <br />