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..' AUG 1E '89 12:13 BIO NATIr'"'=L CORP. <br /> (C) 1989 BIO NATIONAL C:ORP'ORATION <br /> 5- "PLY FOR VARIANCE TO TREAT HYDROCARBON SOIL CONTAMINATION IN <br /> SITU I <br /> a. Ass�iming acceptance of on site cutti Igs/water treatment, knowing <br /> the underlying water table ,is already contaminated with both <br /> petroleum and chlorinated hydrocarbon products, simultaneous in <br /> situ soil treatment is the most desiratle approach to mitigation of <br /> the site. <br /> b. CONTROLLED GROUNDWATER EXTRACTION, COUPLED WITH BIO-AUG- <br /> KENTED VAPOR EXTRACTION OF THE SOILS, WILL ASSURE CONTROL <br /> OF FLUIDS AND VAPORS IN THE I SOIL AND GROUNDWATER <br /> SIMULTANEOUSLY, AS ALL M0V:5'v1R1-NT WILL BE TOWARD THB <br /> EXTRACTION WELLS. <br /> Bio-augme,ritation of the vapor extraction process allows in situ <br /> treatment of both volatile and non-volatile hydrocarbons by oxidative <br /> microbes. The aystem has full conti-61 over remedial fluids by <br /> excess fluid extraction from insertion/venting° and extraction wells. <br /> d. Soil contamination should be mitigated along with groundwater <br /> treatment, to prevent further contamination of the groundwater as <br /> seasonal variations in Nater table occur., <br /> 8. Potential air' pollution will be controlled b v conventional methods, <br /> finishing with a carbon filter. <br /> It is hoped that this outline and the accompanying Work Plan will receive a <br /> "go-ahead" from DOHS, RWQCB and Sen Joaquin County. We believe it i <br /> represents a practical and thoughtful approach toy a fairly well contained, but <br /> complex Problem. <br /> ' y at,tacRing the groundwater problem immediately, we hope to avoid any <br /> negative effects of a wet winter, including ;'e, ersal of the groundwater � <br /> gradient. <br /> While we expect to make adjustments as the process develops, we are <br /> c"=rifident by retaining full, control over both the groundwater and vadose zone <br /> activity, the whole can take place: in a'M reasonably short time with <br /> excellent results <br /> erald V. Todd, Ph.D. <br /> President j <br /> August 1.6, 1989 � <br /> I <br /> 1 <br /> 4 HOLT806 <br />