SITE INFORMATION AND CORRESPONDENCE

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Upgradient,,.Environmental Ccsultants January 25, 2001 Mr. Todd Teresi Teresi Trucking P. O. Box 1270 Lodi, CA 95241 Subject: Completion of Site Investigation Teresi Trucking Yard 900-112 E.Victor Road Lodi, CA - Dear Mr. Teresi: -- On September 19, 2000, you were notified by the Environmental Health Division of the San Joaquin County Public Health Services agency (PHSIEHD) that the investigation and remedial action at your site had been completed and a No Further Action letter had been issued by the Central Valley Regional Water Quality Control Board. Accordingly, PHSIEHD directed you to destroy the groundwater monitoring wells at your site. Upgradient Environmental Consultants submitted a Work Plan for. Well Destruction to PHSIEHD on October 30, 2000 and was granted a Well Destruction Permit on December 6, 2000. On•December 7,V&W Drilling mobilized a truck-mounted drilling rig (CME- 75) to the site to drill out the three existing wells, all of which were 75 feet in depth. V&W used 10-inch-diameter augers to destroy the wells and fill the boreholes with cement grout in accordance with'County regulations. Two of the wells were destroyed without incident; however,problems occurred with well TT-3, when the augers began to drift off vertical. The driller attempted to re-center the drill bit over the boring, but the bit could not bore through the well seal (cement grout) and continued to drift farther off line. Therefore, drilling was terminated at a depth of approximately 25 feet and the PHSIEHD inspector was informed that further attempts to drill out the well would be fruitless. All borings were backfilled with cement grout at the end of the day and the drill cuttings were stockpiled on plastic sheeting for later profiling. Upgradient Environmental collected one composite sample from the stockpile on December S and transported it to Sequoia.Analytical for laboratory analysis. Total Petroleum Hydrocarbons in the diesel range were detected at a concentration of 6 mg/kg (parts per million) in the sample. The laboratory.report is attached. Also on December 8, I spoke with the PHSIEHD representative (Ms. Carol Oz) regarding the difficulties encountered with TT-3. During our discussion, she informed me that County regulations stipulate that monitoring wells can be pressure-grouted with cement grout if contamination is not present, but must be drilled out if contamination is known or suspected. She then indicated that it would be necessary to repeat the attempt to drill out the well, perhaps with other equipment. I explained that no contamination was detected in any of the original soil samples that had been collected from TT-3 when it was drilled, Stockton: P.O. Box 8002,Stockton, CA 95208 (209) 772-3620 - Cameron Park: 3369 Kimberly Road, Cameron Park, CA 95682 (53 0) 677-3055