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EDMUND G. BROWN JR. <br /> GOVERNOR:_)•. r GOVERERNOOR , <br /> C A t I I O R..A 1410000 <br /> SECRETARY oORDRIOUEZ <br /> WaterBoards ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 7 February 2014 �p�4 <br /> FSB 11 . <br /> Mr. Phil GoalwinNVIAONMESE�V CE <br /> E2C Remediation f- ?VW�11 <br /> 5300 Woodmere Drive, Suite 105 <br /> Bakersfield, CA 93313 <br /> COMMENTS ON SUPPLEMENTARY BATCH PUMPING REPORT AND REQUEST FOR NO <br /> FURTHER ACTION— FORMER BUSY BEE CLEANERS, LODI, SAN JOAQUIN COUNTY <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff has <br /> reviewed the report entitled "Supplemental Batch Pumping Report of Findings"dated 27 <br /> November 2013 prepared by E2C Remediation. The Report was prepared for the former Busy <br /> Bee Cleaners (Site) in Lodi and was to provide data in support of a No Further Action <br /> determination (NFA). <br /> Background <br /> E2C submitted a report' showing residual concentrations of PCE in two groundwater monitoring <br /> wells (MW7-BB and EX-1 BB) that exceeded the Maximum Contaminant Level (MCL) of 5 ug/L. <br /> In an attempt to reduce the isolated "hot spots" near the wells, E2C conducted an additional <br /> batch pumping event on 5 November 2013. During this event, E2C extracted approximately 560 <br /> gallons from MW-7BB and 80 gallons from EX-1 BB. On 12 November 2013, E2C collected <br /> groundwater samples from wells MW-7BB and EX-1 BB. The sample results are shown below: <br /> Pre-Extraction PCE Post Extraction PCE <br /> Well Name Concentration, [Ng/L] Concentration, [pg/L] <br /> 21 February 2013 12 November 2013 <br /> MW-7BB 10.3 5.1 <br /> EX-1 BB 10.2 1.4 <br /> The recent groundwater data from wells MW-7BB and EX-1 BB shown above indicate that <br /> residual concentrations of PCE in the groundwater beneath and in the vicinity of the Site are <br /> nearly at or below the MCL. Based on calculations performed by E2C, the residual PCE in <br /> groundwater is predicted to reach the Public Health Goal of 0.06 pg/L in approximately 13 <br /> ' High-Vacuum Extraction Report of Findings; E2C Remediation, 10 April 2013 <br /> KARL E. LONGLEY SCD, P.E., CHAIR I PAMELA C. CREEDON P.E., BCEE, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200,Rancho Cordova,CA 95570 I t'✓ww.waterboards.ca.gov/centralvalley <br /> C*.%RECYCLED PAPER <br />