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December 22, 1998 <br /> 41017 002 Harding Lawson Associates <br /> Mr Michael Kith <br /> ' PHSIEHD <br /> Page 11 <br /> ' • Soluble analyses indicate that these soils do not contain detectable concentrations of soluble TPHd <br /> or TPHmo, and therefore do not pose a potential threat to groundwater quality <br /> ' . The excavation was appropriately backfilled and compacted <br /> Quarterly monitoring of the four wells around the UST was performed on July 28, 1998 and on October 14, <br /> 1998, approximately 3 months following the UST removal The analytical results indicated that for both <br /> ' sampling events none of the analytes were detected above their respective reporting linuts (copies of the <br /> analytical reports are attached) This data further supports the soluble data, in that, the remaining impacted <br /> soils do not threaten groundwater quality beneath the Site <br /> ' Based on the analytical results and the observatLons made in the field, and the quarterly monitonng results, <br /> HLA concludes that the soils remaining in place adjacent to the former UST sidewall do not pose a threat to <br /> ' groundwater quality and do not require any additional sampling or investigation <br /> Based on the information and conclusions presented in this report and summarized above, HLA recommends <br /> that the four monitonng wells be properly destroyed and that UST be considered appropriately closed and a no- <br /> further-action-required letter be issued by the PHS/EHD to Newark-Sierra <br /> LIMITATIONS <br /> The activities were conducted in accordance with practices and procedures generally accepted in the consulting <br /> engineering field Information presented in this report does not confirm the presence or absence of suspect <br /> materials at the property, but indicates whether the possibility of such materials exists based on the scope of <br /> work performed Our professional opinions expressed herein are based on limited data, no other warranty is <br />' given or implied by this report This report is complete and accurate to the extent that cited reports and agency <br /> information are complete and accurate <br /> 1 <br /> 10 <br /> r <br /> • <br />