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Ripona Market <br /> Quarterly Groundwater Sampling Report July 2002 <br /> Page: 3 <br /> • <br /> established water quality goals The MTBE release appears to be centered on well MW2 <br /> with slight down gradient migration toward well MM3 The low concentrations in well <br /> MW3 indicate that the plume is localized in the vicinity of the release <br /> Fuel oxygenates were previously detected in soil samples collected at depths of 25 and 30 <br /> feet in a boring in the vicinity of the former underground storage tanks The extent of the <br /> groundwater plume, as detected in the current monitoring event, is undefined A survey <br /> of potential contamination plume receptors within 2,000 feet of the point of release <br /> identified water well approximately 2000 feet from the former underground storage <br /> tanks <br /> A work plan for an additional site investigation, approved by San Joaquin County <br /> Environmental Health Division, will be implemented Base on the absence of methanol in <br /> the groundwater samples, methanol analysis should be discontinued in future monitoring <br /> events and omitted from the additional site investigation Quarterly monitoring will <br /> continue with next event scheduled for October 2002 <br /> The above represents our best professional opinion as to environmental conditions at this <br /> site These opinions were derived using data at hand, and standards of care common to <br /> the environmental consulting community in Northern California There is the possibility <br /> . that even with proper application of the above methodologies, there may exist on the <br /> subject property conditions that could not be identified within the scope of this sampling <br /> work or which were not reasonably identifiable from the available information The <br /> methodologies included in this report are not intended to produce all inclusive or <br /> comprehensive results, but rather to provide the client with information regarding <br /> apparent suspicions of existing and potential adverse environmental conditions relating to <br /> the subject property Additional work at this site may generate data that could lead to a <br /> change of opinion regarding conditions or appropriate remedial procedures or both <br /> Prepared by �Fp,EO G,6p <br /> Hca �EFITIF1 <br /> iu ROBERT FOURTc'n <br /> �-- cc EN' 1 0 <br /> pV <br /> Certified Hyd og ologist #180 9�F�F CAL�F��� <br /> 1�14vrRON.ar�,yr <br /> KL <br /> Michael <br /> VJ- 1KILerda nz, A, RE HS MCI 02157 <br /> California Registered Environmental Assessor#02157 <br /> California Registered Environmental Health Specialist #4783 Expires <br /> I <br />