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M • <br /> should include a dilution ventilation system which increases the frequency of air exchange <br /> ' t in the enclosure <br /> Physical Setting - The subject site is located in the San Joaquin Valley, the southern <br /> portion of the Great Valley geomorphic province of northern California The Great Valley <br /> ' is generally characterized as an asymmetrical structural trough into which large quantities of <br /> marine, alluvial fan and stream sediments have been deposited Groundwater in the site <br /> vicinity was found to be approximately 16-25 feet below ground surface and travel in a <br /> southwest direction <br /> 62 Recommendations <br /> On the basis of the information compiled and reviewed by MARK, we recommend <br /> further investigation or documentation of the site conditions To address the issues pertinent <br /> to the subject site, MARK recommends <br /> ■ Further inquiry into Chevron's files regarding any information related to the <br /> removal of the underground storage tank(s), environmental sampling, location of <br /> former underground storage tank(s) and location of existing piping, <br /> 0 Perform underground survey to locate existing underground piping and utilities, <br /> of documentation is unavailable, <br /> ■ Investigation of the subsurface conditions in the areas around the former <br /> underground storage tank(s) and existing piping, and <br /> 0 Investigation of the subsurface conditions resulting from off site impacts from the <br /> former adjacent Golden Star Liquor site <br /> PHASEI 6 6-3 95-1104801 <br />