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decrease excepting in MW-2 where it continues to vary between 0 2 and 0 7g/L <br /> While the inferred source of leaking UST's and piping has been removed and there is <br /> no replenishment of diesel contamination, earlier soil contamination remains Potential <br /> long term impact on surrounding shallow ground water requires further assessment of <br /> the contaminated zone and modeling of the residual hydrocarbons impact <br /> To this end it is important to quantify the residual hydrocarbons, consider the Iithology <br /> and other factors bearing on plume migration and establish a "non-detection" boundary <br /> about the plume Very low levels of contamination at the site's north and eastern property <br /> line (MW No 6) suggests a plume non detect (<0 050 g/L) boundary to be within one <br /> hundred feet outwards from the industrial site <br /> This workplan addresses further efforts to define the plume boundary <br /> 1.3 Agency Discussions <br /> The Lead Agency for this site remediation is the San Joaquin County Public Health <br /> Service, Environmental Health Division (PHS/EHD) The current contact is Jeffrey Wong, <br /> REHS, at LOP/Site Mitigation Unit IV 304 East Weber Ave , 3`d Floor, Stockton, CA <br /> 95202, (209)468-3920 <br /> In cases where groundwater contamination exists or is threatened, final acceptance by <br /> the Central Valley Regional Water Quality Control Board (CVRWQCB) of applied <br /> mitigation is required The CVRWQCB contact is Marty Harzell, at USU Unit, 3443 <br /> Routier Road, Sacramento, Cal,fomia 95827-3098 <br /> A meeting was held September 19, 2000 between WO&S's Hans Ho, PhD and Jeff <br /> jHopkins, PHSIEHD's Jeff Wong The PHSIEHD representative said that definition of the <br /> non detection groundwater contamination boundary was necessary in order that the long <br /> Iterm impact of the in situ contamination could be defined <br /> 1-3 <br />