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A <br /> December 16, 1986 <br /> Beacon Service Station 03-492 - Manteca, californiaG$ 86102-1 <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Although the measured local ground water gradient is level we <br /> understand, through conversations with Laurie Cotulla of the San <br /> Joaguin Local Health District, that the regional <br /> ground water <br /> gradient is toward the northwest:. The relatively higher levels <br /> Of soil contamination found in B-1/MW-1 and B-2/MW-2 and the law <br /> to non detectable level of soil contamination in B-3/MW-3 offer <br /> further evidence for a northwesterly flow. The source of <br /> �ontaminat%in appears to be up gradient from <br /> - MW-1 and MW-2. The <br /> low levels of soil and water contamination found in B-3/MW-3 <br /> could be the result of migration of the hydrocarbons along the <br /> relativelyflat <br /> gradient, or could represent background levels <br /> for the site. <br /> 1 <br /> The levels of contamination detected in the <br /> ' ground wat r. samples <br /> from MW-1, and MW-2 are above drinking water standards. Remedial <br /> action may be necessary. It is our understanding,. based on <br /> conversations with Laurie Cotulla of the San Joaquin Local ;health <br /> District, that the ground water in the vicinity of the site is <br /> used 'for domestic purposes. we will evaluate this during the <br /> preliminary phase of a._remedial-program;--of--one-is-aeedea. <br />