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Water Well Log Aquitard <br /> The aquitard mentioned in regard to the water well (number 2S/5E-22Q, State Permit <br /> Number 78-330, address Gonzales Transit Mix, 8181 W. Business Loop 205, Tracy, CA, <br /> see attached log) were those logged by the driller at the time of well installation in 1978. <br /> The drillers log shows "clay" logged at 19-21 feet, and a deeper "clay" from 27-48 feet. <br /> The log shows that the sanitary seal extends to 50-feet from the surface, hence these clays <br /> could be aquitards sealed by the well seal. <br /> Possible Additional Water Wells On-site <br /> PHS-EHD indicated that additional water wells may occur on-site on the basis of the <br /> undated Resna figure. The site owner indicated that no other wells occurred on-site. <br /> Wright will make a physical surface inspection to search for additional wells. If those <br /> wells are present, Wright will attempt to sound and sample them for the contaminants <br /> previously analyzed. <br /> Additional Monitoring Wells If Needed <br /> PHS-EHD has indicated that if any of the proposed monitoring wells show contaminant <br /> presence, additional deeper discretely screened wells may be required. Wright is in <br /> agreement the site should have adequate groundwater monitoring. The previous site soil <br /> and groundwater chemical data indicates a plume of degraded TPHD with degraded TPH <br /> Gasoline, depleted in volatile components. Aquitard soil samples (at about 26 feet±) will <br /> be collected to ascertain contaminant presence in that strata (on the assumption that if the <br /> contaminant had vertically transited the strata, residual contaminants would possibly <br /> remain). Wright recommends reviewing the data collected for the entire site in the previous <br /> and projected assessments, including after the proposed monitoring wells have been <br /> installed and sampled, to determine the need for deeper discretely screened wells. <br /> We hope this letter has clarified your questions. If you have any questions, call. <br /> Sincerely,, <br /> Wright Environmental Services, Inc. pl� �y <br /> ''1 N2 1262 <br /> ��,�qi "�_�+� j10'a�-, CERTIFIED <br /> Jo Lynch Christopher M. Palmer L E:G' : Er!';G <br /> President HG 246; CEG 1262 t <br /> �}sT GECLCG;ST 1. <br /> Attachment: State Water Well Report number 2S/5E-22Q, State Permit Number 78-330, <br /> Gonzales Transit Mix, 8181 W. Business Loop 205, Tracy, CA. <br /> Reference <br /> Jackson, J. A. and Bates, R. L., 1987, Glossary of Geology: American Geological <br /> Institute, Alexandria, VA, pg. 33. <br /> Page 2 <br />