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Upgradiemknvironmental CGOsultants July 17, 2001 Mr. Ken Gillies Gillies Trucking P.O. Box 8303 Stockton, CA 95208 ` �o Subject: Second Quarter 2001 Monitoring Report a �� C Gillies Trucking Yard r- 3931 Newton Road y. p Stockton,CA Dear Mr. Gillies: .c- cn The purpose of this letter is to transmit the results of the groundwater monitoring activities that = took place during the second.calendar quarter at 3931 Newton Road. Because monitoring was limited to the two domestic wells at 3931 and 3851 Newton road, we have not prepared a full monitoring report. At his request,I met with Mr.Jeff Wong of San Joaquin County PHS/EHD at your site on July 3 to collect a water sample from each of the domestic wells. When I arrived at the site, I noted that some.of the groundwater monitoring wells had been located and the gravel had been cleared to allow access to the well, but other wells were still buried and I therefore postponed monitoring or sampling the wells until all of them have been exposed.I allowed the two domestic wells to flow for approximately 15 minutes before collecting a sample from the tap in a 1-liter amber bottle. The two samples_were placed in a cooled ice chest and later transported to Excelchem Analytical Laboratory in Roseville. They were analyzed for Total Petroleum Hydrocarbons in the diesel range, and the laboratory report is attached. Diesel Was not detected in either sample. We also reviewed the letter from Mr. Wong to you,dated June 21, 2001, in which he requested that a pumping test be conducted before July 31,2001. We have since spoken to Mr. Wong and explained why such a test would not be appropriate at this time. Presently,there is less than 5 feet of groundwater in the contaminated aquifer,which has a small areal extent and would rapidly go dry under pumping test conditions.In recent monitoring events,we have found that the well goes dry after only a few minutes of purging, implying that an extremely slow pumping rate would be required to prevent this from happening during a pumping test. Pumping at such a slow rate would not be an effective method of remediating the groundwater contamination at your site,and would be a very slow process requiring several years. Mr. Wong has asked us to investigate alternative treatment methods prior to the meeting that he has scheduled for August. Si ere Victor B. Cherven President cc: Jeff Wong, PHS/EHD Marty Hartzell, CVRWQCB e9 Stockton: P.O. Box 8002, Stockton, CA 95208 (209) 772-3620 Cameron Park: 3369 Kimberly Road, Cameron Park, CA 95682 (530) 677-3055