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California -gional Water Quality Con .1 Board Central Valley Region t `E Karl E. Longley,ScD,P.E.,Chair Linda S.Adams Arnold Secreraryfor Sacramento Main Office Schwarzenegger SecyEnvirt aryfoal 11020 Sun Center Drive 4200,Rancho Cordova,California 95670-6114 Governor Phone(916)464-3291 •FAX(9)6)464-4645 Protection http://www.waterboards.ca.gov/centralvalley IIrr �� IIS\V/�I�� LI��'.�J�t! V L� July 14, 2008 JUL 1 7 2008 ENVIROKIEN T HEALTH Mr. Philip Goalwin PERMIT/SERVICES E2C Remediation 5300 Woodmere Drive, Suite 105 Bakersfield, CA 93313 APPROVAL OF REMEDIAL ACTION PLAN, FORMER BUSY BEE CLEANERS, 40 NORTH MAIN STREET, LODI, SAN JOAQUIN COUNTY Staff of the California Regional Water Quality Control Board, Central Valley Region (Regional Water Board) have reviewed the Draft Final Remedial Action Plan (RAP) for the Former Busy Bee Cleaners (the Site), located at 40 North Main Street in the city of Lodi, San Joaquin County. E2C Remediation, Inc., prepared the document on behalf of the representatives of the Busy Bee Site. A dry cleaning business was operated at this property from 1984 through 1996. During the operation of the dry cleaning business, dry cleaning chemicals, specifically perchloroethene (PCE), were released to soil and groundwater. Based on the evaluation of remedial alternatives for the site, presented in the Feasibility Study (FS) dated September 6, 2006, and subsequent field-scale pilot studies conducted at site, the proposed remedial alternative for the Busy Bee Site is Soil Vapor Extraction combined with Groundwater Air Sparging (SVE/GAS). The proposed remedial alternative is a proven technology for the removal of volatile organic compounds (VOCs), including PCE, from soil and groundwater. A fact sheet describing the proposed plan was distributed to all businesses and residences located in the area above the groundwater plume and within two city blocks of the plume perimeter. The fact sheet invited the public to comment on the proposed plan but no comments from the public were received. Implementation of SVE/GAS is expected to restore the beneficial use of the polluted groundwater at the site and is predicted by E2C Remediation, Inc to achieve Cleanup Goals within two (2) to three (3) years. In accordance with State Water Board Resolution 92-49, the discharger must cleanup groundwater to "background" levels unless it is not technically and economically feasible to do so. The background level for PCE at the site is zero. However, the analytical detection limit for PCE in groundwater water is 0.5 Ng/L and therefore 0.5 pg/L is the technically feasible cleanup level for PCE in groundwater. The criteria for the cessation of SVE is when 1) PCE levels in vapor effluent samples from the SVE treatment system are stable and approach non-detectable levels at the method detection limit using Modified EPA Method TO-15, and 2) following rebound testing, E2C demonstrates, to the Regional Water Board's satisfaction, that residual concentrations of PCE in the soils at the site do not pose a threat to public health or the groundwater. California Environmental Protection Agency Via'Recycled Paper