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Shaw Environmental,Inc. <br /> 4005 Port Chicago Highway <br /> Concord, CA 94520 <br /> Telephone: 925-288-2381 <br /> Fax: 925-288-0888 <br /> aw <br /> June 7, 2010 <br /> Project 124601 <br /> Mr. W. Michael Carroll, PE <br /> County of San Joaquin <br /> Department of Public Works <br /> 1810 E. Hazelton Ave. <br /> Stockton, California 95201 <br /> Re: Evaluation Monitoring Well G-2 at the North County Sanitary Landfill, San Joaquin <br /> County, California <br /> Dear Mr. Carroll: <br /> The purpose of this letter is to report on Monitoring Well G-2 at the North County Sanitary <br /> Landfill. <br /> G-2 is an approximate 170-foot deep monitoring well that was installed in the third quarter <br /> of 1987. The first monitoring event conducted on this well was on August 17, 1987, and <br /> was monitored until third quarter 1996. G-2 has not been monitored since that time because <br /> it has not been included in the Monitoring and Reporting Program associated with the Waste <br /> Discharge Requirements for the site. The County has, however, continued to take depth-to- <br /> groundwater measurements at this well. <br /> G-2 is installed in the same water-bearing unit as the other monitoring wells on site. Water <br /> levels have continued to be recorded at this well. As indicated by the Historical Summary of <br /> Analytical Results (attached), the water quality at this well is consistent with the other <br /> groundwater monitoring wells on site, and does not indicate impact by the landfill. <br /> Assessment <br /> Assessment of this well is based on three criteria: <br /> I. Is the well in adequate condition to be sampled? <br /> The depth to water at the last monitoring event (May 20, 2010) was 158.65 feet, which <br /> indicates that there is sufficient water in this well for sampling. <br /> Based on Shaw's investigation of the well, the well riser and surface seal appears to be <br /> secure, the well is appropriately screened to sample groundwater, and it appears that this <br /> well is in an adequate condition to be sampled. <br /> C-11 NCLF G-2.dm <br />