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i Working To Restore Nature 1710 Main Street Escalon, CA 95320 Phone: (209) 838-3507 FAX: (209) 838-3509I ' ' f/ April 8, 1993 U Mr. Mike Mosbacher RECEIVED CA Regional Water Quality Control Board Central Valley Region 3443 Routier Road, Suite A APR 12 19g� Sacramento, CA 95827-3098 ENVIRONMENTAL HiALTH PERMIT/91RVIOU RE: Genstar/Western Stone Products, 8181 West Eleventh Street, Tracy, CA Dear Mr. Mosbacher: This letter presents the alternatives for disposal of approximately 20,600 gallons of water that is contained in a Baker tank at the above referenced site (Figure 1). Petroleum hydrocarbon impacted water was pumped into the Baker tank from an excavation pit in October 1992. Bioremediation was utilized to treat the impacted water. Laboratory analysis of a water sample collected in February 1993 (Table 1) did not detect any petroleum hydrocarbon constituents, indicating that bioremediation had been successful. Several alternatives have been proposed for disposal of the stored water. One option was to transport the water to the City of Tracy sewage treatment plant. This plan was discussed with treatment plant personnel and initially approved by them. However, when recently contacted, plant personnel indicated they would not accept water that does not need treatment as this merely adds to the hydraulic load on their equipment. A second option would be to use the water in concrete batching operations at the site. The mixing plant uses between 3000-3500 gallons of water per week. At this rate, it would take nearly two months to utilize all of the stored water. Additional costs for Baker tank rental would be incurred during this time. A third choice would allow discharge of the water to the surface at the project site. Discharge could occur either by release from the tank to the ground, in effect, flooding a portion of the site; or, the water could be utilized in a sprinkler truck for the purpose of dust control. Q UA R TLY%W D L R0493.FNL