Laserfiche WebLink
C <br /> page 3 <br /> 26500 Nowell Road <br /> PHS/EHD responded to the "Request For No Further Action" report in correspondence <br /> dated January 6, 1999. Based on the analytical results from the soil samples discussed <br /> above, PHSIEHD denied issuance of a No Further Action designation and requested <br /> that vertical definition of the soil contamination in the source area be completed. <br /> PHSIEHD is also concerned that vertical and lateral definition in ground water has not <br /> been made at this site. No water sample has been collected for analysis from this site <br /> below 20 feet bsg, while soil contamination has been documented at 33 feet bsg. The <br /> groundwater gradient at this site is divergent but has been southerly 3 out of the 5 times <br /> that is has been determined. PHSIEHD feels that this data, in combination with the <br /> documented 34 feet bsg ground water contamination at the southern adjacent Tri-Valley <br /> site, is indication that a complete site characterization has not been made. Plume <br /> stabilization assessment, mass balance calculations and risk evaluation cannot be <br /> properly completed until the full extent of the contamination is documented. <br /> The well survey presented in the ENSR document was incomplete. It included neither <br /> the domestic wells located on the west side of Nowell Road nor the production and <br /> remediation wells located on the Tri-Valiey site. An assessment of the potential risk <br /> posed by this site cannot be made without a complete list of sensitive receptors. <br /> In summary, PHSIEHD requests a complete listing of wells within a 2000 foot radius of <br /> this site be submitted and documentation be presented that there is not a deeper <br /> groundwater contaminant plume existing at and migrating from this site. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> I <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> L-oi,,k cl <br /> Lori Duncan, REHS Marg�etLagoorio�, EHS <br /> Site Mitigation Unit IV Supervisor, Unit IV <br /> Enclosures <br /> cc: Mark List, CVRWQCB, wIo enc. <br /> Pamela Lopez, w/o enc. <br /> Alan Klein, ENSR, w/o enc. <br /> Chris Savage, Tri-Valley Growers, w/o enc. <br />