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s <br /> Beacon #419 <br /> 2350 Waterloo Rd , Stockton page 2 <br /> Sol] and groundwater samples should be analyzed for TPH-G, BTEX, and all oxygenates <br /> known to be contained in the gasoline stored in the UGTs UltraMar's use of ethanol and/or <br /> methanol in the past may now present a problem for laboratories PHD-EHD recommends <br />' that you ascertain that the laboratory your consultant plans to use is capable of detecting <br /> and discerning if these additives are present in the soil and groundwater samples submitted <br /> for analyses Current policy requirements from the CVRWCQB include EPA Method 8260 <br /> for use in detecting the oxygenates and PHS-EHD has enclosed our latest guideline for <br /> your review <br />' PHS-EHD recommends that this proposed phase of investigation be modified to include the <br /> required vertical delineation of the soil and groundwater If soil contamination is detected at <br /> the historical low depth to groundwater, it will need to be delineated to the lateral extent as <br />' well as the vertical extent An alternate plan should be prepared that will include the <br /> placement of additional wells or casings at depths where deeper contamination exists <br /> PHS-EHD will not be able to approve remediation plans for a site until the full extent of the <br />' contamination is verified <br /> An addendum to this workplan is needed pnor to approval by PHS-EHD Please submit <br /> one in a timely manner that includes the above noted items A boring permit application <br /> and the $89 fee should also be submitted with the addendum <br />' UltraMar, Inc does not own the service station now doing business at this address In order <br /> to be able to issue a boring permit for this parcel, PHS-EHD will need to verify that an <br /> access agreement is present that allows you to continue the onsite investigation Please <br />' submit a copy for PHS-EHD records <br /> You may continue to direct your submittals to Michael infurna and you may call him at (209) <br />' 468-3454 should you have any questions or wish to discuss the site <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Micnael J Infuma Jr , Senior REHS Margaret agono, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> MI/ <br /> Enclosure <br /> CVRWQCB - Pat Anderson (w/o enclosure) <br /> C Horizon Environmental — Kenn B Ma <br /> Y teik, CEG, 5011 Foothill Pkwy, Ste#7, <br /> EI Dorado Hills, Ca , 95762 (w/enclosure) <br />