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AAPEX NOV - 3 2005 ENVIRONMENT HEALTH PERM1rIsErIVIcEs 11244 Pyrites Way • Gold River, (A 95670 E N V I R 0 T E C H , I N C . Phone 916.851.0174 Fox 916.851.0177 Toll Free 1.800.242.4259 November 1, 2005 Mr. Michael Infuma San Joaquin County Environmental Health 304 East Weber Avenue, Third Floor Stockton, California 95202-2708 Subject: Formal Reply to October 18, 2005 Phone Conversation Flag City New West#1003 6437 West Banner Street Lodi, California Apex Project No. NWP01.004 Dear Mr. Infuma: Apex Envirotech, Inc. (Apex) has been authorized by New West Stations (New West) to reply to the phone conversation on October 18, 2005. In that phone conversation, it was discussed that the startup and operation schedule for the interim remediation system should commence immediately. Apex has already begun the extraction well and remediation compound installation processes. You, Mr. Infuma with San Joaquin County Environmental Health(SJEHD), suggested that Apex arrange to haul the treated water from the site to the local sewer authority in batches until the NPDES permit was approved, which normally takes six months. Apex and New West are dedicated to protecting the water resource currently being utilized by the City of Lodi to service their customers. However, due to the cost of batch hauling water from the site to the disposal facility in Rio Vista (disposal to the local sewer facility was denied due to high volumes), further investigation and delineation of the groundwater plume is a more prudent course of action at this time. The cost to batch haul water from the site to the disposal facility for six months is estimated to cost $1,200,860.00. The interim remediation system will utilize groundwater pumping and treatment of the first water zone. The site wells are expected to yield water at a rate of 4 gallons per minute (gpm) with a total system volume anticipated at 20 gpm or 28,800 gallons per day (gpd). The capacity of a vacuum truck is approximately 5,000 gallons so batch hauling will require six truckloads per day and a 21,000 gallon baker tank to store treated water at the site. A high level float 'safety shutoff system is also required to avoid overfilling the baker tank.