ARCHIVED REPORTS XR0003037 - Laserfiche WebLink

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Chevron Products Company 15 Former Chevron Service Station #9-5775, 301 West Kettleman Lane, Lodi, California June 5, 2001 6 2 1 Abandon and Replace Well 12 Chevron has Initiated preliminary discussions with the City of Lodi to negotiate the purchase and replacement of Well 12 The cost to purchase a property and Install a replacement well is estimated to be in excess of $1,000,000. In addition to the installation of the replacement well, the water distribution network would need to be reconfigured to accommodate the new well The City of Lodi does not feel that this course of action is necessary at this time 6.22 Well Head Treatment SECOR has initiated conversations with US Filter/Westates to evaluate the potential of wellhead carbon treatment of the Well 12 US Filter/Westates has manufactured and provided numerous municipal wellhead carbon treatment systems for the City of Lodi Utilizing projected worst-case contamination scenarios and the well specifications, at 90,000 -pound carbon treatment system consisting of three 30,000 -pound units plumbed in series would be adequate for this application The cost of procurement and installation of this system is expected to be in excess of $350,000 In addition to the procurement and installation costs, property adjacent to Well 12 would need to be acquired to house the unit Property negotiation and system implementation is expected to require a minimum of eight months 6.2.3 Removal From Active Service I& In May of 2001, Chevron completed negotiations with the City of Lodi and successfully reassigned Well 12 from active service to emergency standby status Under emergency standby status, the City will operate the well only during emergency loss of pressure in the water distribution network The City will also periodically operate the well for a short duration to collect water quality samples The City has identified this alternative as the least intrusive and thereby the most feasible method of protecting the drinking water supply Chevron is reimbursing the City of Lodi $2,000 per month in compensation for reassignment of Well 12 to emergency standby status Under tlus plan the well would remain on emergency standby status for a total cost of $24,000 per year 6,3 Enhanced Groundwater Extraction • The existing GWE system currently extracts approximately 10 gallons per mmute from the on-site extraction wells EX -1, EX -2, and EX -3 Results of aquifer testing and modeling indicate that significant hydraulic capture is generated by operation of the existing groundwater extraction system, however, recent assessment and monitoring results indicate that minor concentrations of petroleum hydrocarbons have migrated to the practical limit of the radius of capture It is anticipated that a maximum flow rate of 30 gpm may be accommodated by installation of a small air stripper or additional carbon treatment beds SECOR is currently investigating these options I IChevron1957751ParFrpl9-5775PARFRP2 doe