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. ; �", � ?_� ,:; i-•". a� a' ��� _.�� � � � tea, <br /> 5 <br /> 1� <br /> 11 <br /> i <br /> D.Q.S. - Stockton Inc- <br /> pot Plrtlog 3941 <br /> j Pege -1: <br /> Option 4 <br /> Perform a groundwater investigation. Typically a <br /> i _ <br /> groundwater investigation includes the installation of at least 3 <br /> monitor walls at the site to investigate the horizontal limitz of <br /> r soil and groundwater contamination. The elevation of the well <br /> collars are surveyed and depth to water measurements are ta;:e;i to <br /> detexzine the groundwater flow direction. The disadvantage of <br /> _ this option is that the source of the green petroleum stained <br /> soil encountered fror a depth of 25 feet down to 50 feet has not <br /> E been identified. It is likely that the groundwater flow <br /> directiolx.-' as varied much over the past several decades. A <br /> groundwater investigation would be premature at this stage. <br /> �J ! <br /> ' 5.3 Recommendations <br /> Condor recommends that the site be re-excavated to remove as <br /> much of the gasoline contaminated soil as possible. Based upon <br /> J the above information this appears to be the most feasible and <br /> productive remedial option. <br /> ` Condor further recommends that a thorough site history <br /> J , <br /> investigation be conducted. The layer of petroleum stained soil <br /> � f. �1 encountered from approximately 25 feet down to 50 feet appears to <br /> have come from a source other than the gasoline tanks <br /> ^� located directly above. . A records search should be conducted at <br /> -the_.:Stanis.laus_County Environmental Health Department to <br /> investigate the possibly of additional sources or areas of <br /> �. <br /> CONDOR <br /> e <br /> s <br />