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h <br /> 4 May 10, 1987 AGS 86103-2 <br /> Cardlock Station #27 - Stockton, California <br /> RECOMMENDATIONS <br /> r <br /> �t <br /> The levels of hydrocarbons detected at the base of the tank <br /> �F <br /> backfill material may require mitigation in association with tank <br /> repair operations. A soil vapor venting system, an in situ <br /> biodegradation system, or a system combining elements of both <br /> r <br /> programs could be designed which would significantly lower <br /> hydrocarbon concentrations in this area. Applied GeoSystems will <br /> design an effective mitigation program if required by state and <br /> local agencies and if requested by the site owner. <br /> Benzene was found in ground water from MW-4 at a level of 1. 2 <br /> `G <br /> parts per billion. Drinking water standards for benzene are 0.7 <br /> parts per billion. Other constituents were found to be not <br /> detectable or present at levels significantly below drinking <br /> 4 water action levels. These levels are vexy near the detection <br /> „ limits of the methods used. Several other factors can affect the <br /> concentrations reported, including sample collection methods, <br /> sample handling, and spurious results induced during transport or <br /> in the laboratory. <br /> y, <br /> Mf <br /> t4 . <br /> - 14 <br /> �4�p/!ed Ge�oSYstems $Q°>>o <br />