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Mr. Sam Savig <br />Page 3 of 3 <br />0.167 ppm (average of dispenser samples #11 and #12) to 0.009 ppm, a factor of nearly 20X. Depth <br />to first groundwater at the site is expected to be approximately 45-50 feet based on San Joaquin <br />Control Flood Control District information (Attachment Q. The levels of residual MTBE present at <br />the base of the excavation would not have the capacity to degrade groundwater above MCLS. For <br />instance, a 50% attenuation of MTBE would result in a concentration below the State of California <br />secondary MCL of 0.005 ppm. <br />Based upon the extremely limited extent and magnitude of residual soil contamination, we recommend <br />no further action with respect to this fuel leak case. <br />If you have any questions or comments please contact Ground Zero at your earliest convenience. <br />Respectfully, GEo <br />Ground Zero Analysis Pc.�� �p <br />GREGORY P. I"► <br />Gregory P. Stahl, RG 5023 STA I <br />No. 5023 � <br />CA Certified Hydrogeologist No. 264 <br />Attachments OF CAO���aP <br />cc: Dr. Allen Wall, WLM <br />Mr. Chuck Dowdy, Elite IV Contractors <br />elite\wlm\excret. doc <br />