Laserfiche WebLink
800 East Kettleman <br /> Page 2 <br /> In addition to TPH-gas mass estimates, the masses of the more volatile and mobile <br /> constituents such as benzene, toluene, ethylbenzene and xylene, should also be estimated. <br /> TPH-gas contamination does effect water quality; however, the health and aesthetic <br /> considerations associated with the volitiles must also be evalutated. The migrational patterns <br /> also differ and warrant separate environmental fate analysis when evaluating the potential <br /> threat to groundwater. <br /> Bioremediation was referenced as a mechanism involved with petroleum hydrocarbon mass <br /> reduction at the site, approximately 52% in four years. PHS/EHD agrees that bioremediation <br /> does occurs; however, when assigning rates, site specific information should be utilized. <br /> Some methodologies used to evaluate site specific biorernediation rates include, physical data <br /> demonstrating reduction over time or evaluation of lithological information, bioavailability, <br /> biological activity and soil chemistry. Please provide a copy of the referenced article within <br /> the 1995 Proceedings of the Battelle International Symposium on In Situ and On Site <br /> Bioreclamation. <br /> Please proceed with efforts to submit a closure summary report as outlined in the Appendix B <br /> Requests for Closure dated March 1, 1994 and prepared by Staff of the Central Valley <br /> Regional Water Quality Control Board. The closure summary report should include site <br /> specific information, modified estimates of contaminant mass and additional environmental <br /> fate analysis. PHS/EHD suggests that the closure summary report also include recent <br /> analytical results, including MTBE analysis. The results of MTBE analysis should be <br /> included in table form. <br /> If you have any questions or wish to discuss the above referenced report or PHS/EHD <br /> comments, please do not hesitate to contact me at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary M,eays, Senior REHS Margaret Lagorio, REHS <br /> Site Mitigation Unit Supervisor <br /> MM1800KET <br /> cc: Elizabeth Thayer, CVRWQC33 <br /> cc: Jay Johnson, EMCON <br />