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E IM-West, Inc <br /> 1777 Botelho Drive <br /> "° r-, i L HIE AI-TI i Suite 260 <br /> April 13, 1994 t ' QS � A'K,E Walnut Creek, CA 94596 <br /> ' (510) 946-0455 <br /> i{ 2, G 2 (510)946-9968(Fax) <br /> Ms Mary Meays <br /> Environmental Health Division <br /> San Joaquin County <br /> 445 N San Joaquin Street <br /> Stockton, California 95201 <br /> SUBJECT Ground Water Remediation <br /> Activities ERM <br /> 1515 & 1325 West Weber Ave <br /> Sites 1 and 2 <br /> Stockton, California <br /> SJCPHS Site #1285 <br /> Dear Mary <br /> On behalf of Catellus Development Corporation (Catellus), ERM West Inc (ERM) <br /> has prepared this report to document the ground water remediation activities <br /> completed at the former underground storage tank sites located at 1515 (Site 1) & <br /> 1325 (Site 2) West Weber Avenue in Stockton, California (Figure 1) The work <br /> was conducted by ERM in accordance with the Final Remediation Plan (ERM- <br /> West, September 1993) approved by the San Joaquin County Public Health <br /> Services (County) in a letter dated September 23, 1993 This letter report is <br /> organized into the following subsections <br /> • Ground Water Hydrology, <br /> • Previous Investigations, <br /> • Ground Water Remediation, <br /> • Ground Water Monitoring, and <br /> • Recommendations <br /> GROUND WATER HYDROLOGY <br /> Investigation and tank remov activities at the site indicated the presence of <br /> confined shallow ground w ter conditions (Preliminary Assessment Report, <br /> ERM-West, Inc , May 1993) uring drilling activities performed by ERM and <br /> previous consultants, ground water was typically encountered in borings at depths <br /> ranging from 3 5 to 19 feet below ground surface (bgs) In the borings, ground <br /> water was generally first encountered after drilling through a silt and clay zone <br /> into sandy soils The fine-grained silts and clays generally serve to confine the <br /> ground water to the sandy soils The confined nature of the ground water was <br /> SL� ;� <br /> A Member of the Environmental <br /> Resources Management Group <br />