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PUBLIC HEALTH SERVICES �4R4 •c <br /> SAN JOAQUIN COUNTY = i <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer . <br /> P.O. Boz 2009 (1601 East Hnekon Avenue)•stocluon,California 95201 <br /> (209)468.3400 <br /> R W READE <br /> 40 O.KET-EY CA 94705 APR 1 5 19 9 <br /> RE: Yellow Submarine SITE CODE: 2514 <br /> 140 W. Harding Way <br /> Stockton, CA 95202 <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD)has <br /> reviewed the workplan dated March 3, 1993 submitted by Greg Mello and has the following <br /> comments. <br /> Sufficient information does not exist in order for PHS/EHD to consider site certification. <br /> Additional subsurface investigation will be required at 36 feet below ground surface in the <br /> area approximately 20 feet north of monitoring well MW-4. PHS/EHD suggests a slant <br /> boring be considered to gather soil samples for this area that will confirm the extent and <br /> concentration of contamination that was estimated in your report of findings on the <br /> installation of MW-4. With this further investigation, the amount and concentration of <br /> contaminated soli north of MW-4 can be more accurately determined. Once the amount <br /> and concentration of contaminated soil is known, the need for remediation can be <br /> determined. Samples should be analyzed for BTEX, TPH-D and TPH-G. <br /> In an addendum, provide calculations that will enable soli sampling from the slant boring <br /> every vertical 5 feet below ground surface by including the angle of the boring and diagonal <br /> distances required to obtain these samples. Thank you for the revised third and fourth <br /> quarter monitoring reports for 1992. <br /> The necessity of the proposed monitoring well,MW-5 southwest of the former tank location, <br /> is not known at this time. Should groundwater monitoring events indicate a southwest <br /> gradient direction, the installation of this well would be required. <br /> Monitoring Well 3 (currently the downgradient well, located in the northeast corner of the <br /> site) is not being sampled for petroleum hydrocarbons due to problems with its construction. <br /> PHS/EHD considers downgradient well(s) to be a vital component in the investigation of <br /> groundwater downgradient from a contamination source. To ensure a valid and complete <br /> investigation of this site, PHS/EHD recommends MW-3 be destroyed under permit and <br /> replaced with a new well. This replacement well should be located closer to the previously <br /> contaminated source. <br /> A Nrbion of Son Joaquin CCW HOM cine St WCS <br />