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�' �, � _ rte° •, � +� ��=�;, �=', <br /> • <br /> s � <br /> San Joaquin County Public Health Services <br /> Page 2 <br /> July 10, 1991 <br /> SFO31605.PM <br /> ns for Preliminary <br /> According to the Tri-Regional Ret <br /> Evaluation and Investigation Staff <br /> enaa groundwater <br /> is not required because: <br /> The total petrol <br /> my ntall of the soil arbon osampl s beneath the tr total Oil and grease ank. <br /> are less than 1 pp <br /> . No detectable residues for <br /> �eapsonalleum hydrocarbohigh gcaund�'vater level found in <br /> the sail at or below the <br /> The soil is predominantly silt and silty sand. <br /> venue soil <br /> ings <br /> Groundwater was not encounter oc urs at ain the s <br /> deptner Ah of 72 feet bgs inra monitoring <br /> bgs ). However, first groundwater <br /> well located less than a quarter mile southwest of the East Miner Avenue investi- <br /> gation (Disco location). According tt)1,,i-Regional Boar toting Wells on anda- <br /> te <br /> - tions, "the regional board will assess the necessitygroundwater is greater than 50 feet <br /> specific basis" in areas where seasonal high g <br /> bgs. <br /> r Based on this evaluation, Del Monte believes that a groundwater monitoring well <br /> ce investigation at the East Miner Avenue <br /> is not required to complete the subsurfa <br /> location. <br /> Sincerely, <br /> CH2M HILL <br /> Tim Bray <br /> Project Manager <br /> Enclosures <br /> cc:- Wilbur Sprague/Associated Services <br /> Bill Riker/Del Monte <br /> David Koll/Del Monte <br />