Laserfiche WebLink
California 16gional Water Quality Colirol Board <br /> l\, Central Valley Region <br /> Katherine Hart, Chair <br /> Linda S.et Adams 11020 Sun Center Drive#200,Rancho Cordova,California 95670-61 `, Arnold <br /> Environmental Secretary Phone(916)4643291 -FAX(916)464-4645 RECEI V EMarcenegger Protection http://w .w terboards.ca.gov/centralvalley Governor <br /> J N 0 3 2011 <br /> 30 December 2010 <br /> ENViRONMENTALHEALTH <br /> PERMITlsERVICES <br /> Mr. Doc Heath <br /> Glenn Springs Holdings, Inc. <br /> 5005 LBJ Freeway, Suite 1350 <br /> Dallas, TX 75244-6119 <br /> CONDITIONAL CONCURRENCE WITH INSITU BIOREMEDIATION WORK PLAN, <br /> OXYCHEM STOCKTON, 1904 CHARTER WAY, SAN JOAQUIN COUNTY <br /> The former Occidental Chemical Company (OxyChem) site at 1904 Charter Way had been an <br /> agricultural chemical distribution facility under the control of various operators between 19-55 <br /> and 1993. In 2001, contaminated soil near the middle of the eastern boundary (at MW-5B) <br /> was remediated, and in 2003, trees were planted on-site to remove remaining contaminants <br /> from soil and to exert hydraulic control on groundwater. While hydraulic control appears to be <br /> preventing further migration of groundwater pollutants, shallow groundwater beneath the site <br /> contains nitrate, 1,2-dichloropropane (1,2-DCP), 1,2,3-trichloropropane (1,2,3-TCP), dinoseb, <br /> 1,2-dibromo-3-chloropropane (DBCP) and chloride. <br /> OxyChem proposes to accelerate remediation of groundwater beneath the facility by using in <br /> situ bioremediation. This proposal and supporting groundwater quality data are found in the <br /> following documents which were prepared by The Source Group, Inc. <br /> • 29 November 2010 Work Plan for Enhanced In-Situ Bioremediation (EISB) of Shallow <br /> Groundwater, OxyChem Stockton (In Situ Work Plan) <br /> • 1 December 2010 2010 Annual Groundwater Monitoring and Sampling Report <br /> As discussed below, California Regional Water Quality Control Board, Central Valley Region <br /> (Central Valley Water Board) staff conditionally concur with the In Situ Work Plan. With some <br /> minor modifications, the In Situ Work Plan will qualify for permit coverage under General Order <br /> No. R5-2008-0149. <br /> IN SITU PROPOSAL <br /> Occidental Chemical proposes a two-phase approach to remove pollutants from shallow <br /> groundwater. The first phase is to add a mixture of two carbon substrates that will induce <br /> reducing conditions in the injection area at the middle of the eastern property boundary. The <br /> injectants will facilitate microbiological reduction of nitrate and the chlorinated pollutants <br /> 1,2-DCP, 1,2,3-TCP, dingseb, and DBCP. The proposed injectants are HRC° Primer, which is <br /> a dilute formulation of Hydrogen Releasing Compound, and 3DME, which is a micro-emulsion <br /> soybean oil compound. The HRC Primer provides a readily degradable lactate compound that <br /> stimulates the rapid microbial removal of oxygen and nitrate, which thereby establishes a <br /> reducing environment. The soybean oil compound is more slowly degraded, which maintains <br /> California Environmental Protection Agency <br /> CdRecycled Paper <br />