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C t1 �� ED 1117 Lone Palm Avenue Suite B <br /> Modesto California 95351 <br /> MAY 4 2001 <br /> www atc-envi ro cam <br /> 209 579 2221 <br /> Fax 209 579 2225 <br />• A s s 0 c I A T E 5 i N c ENVIRONMENT HEALTH <br /> PERI'VI T DERVICES <br /> May 3, 2001 <br /> 54 92054 0002 <br /> Mr Michael J Infurna <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Ave , Third Floor <br /> Stockton, CA 95202 <br /> Subject Addendum to Closure Summary Report GEMELOS PROPERTY(Paladin Center) <br /> 2421 Holly Drive, Tracy, California, 30 March 1999, AGE-NC Project No 96- <br /> 0217 by Advanced GeoEnvironmental, Inc <br /> Dear Mr Infurna <br /> ATC Associates Inc has prepared this letter report on behalf of Mr John Gemelos, property <br /> owner, to serve as an addendum to the March 30, 1999, Closure Summary Report prepared by <br /> Advanced GeoEnvironmental, Inc for the property located at 2421 Holly Drive in Tracy, <br /> California The site location is shown on Figure 1 This addendum addresses concerns noted in <br /> the April 19, 1999 correspondence from San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS/EHD) to Mr Gemelos and also includes required data as <br /> listed in the Appendix B of the Tri-Regional Board Staff Recommendations for Preliminary <br /> Investigation and Evaluation of Underground Storage Tank Sites (Attachment 1) <br /> 1.0 REMOVAL OF UNDERGROUND STORAGE TANKS <br /> In April 1988, two 10,000-gallon underground storage tanks (USTs) formerly containing <br /> gasoline were excavated and removed from the site, along with approximately 120 cubic yards of <br /> soil A representative from the San Joaquin Local Health District inspected the tank removal <br /> The San Joaquin Local Health District inspection report and closure permit, are included in <br /> Attachment 2 These show that the Health District noted no violations at that time No visible <br /> holes were noted in either tank No odor was noted in the soil Two soil samples and one water <br /> sample were collected from the tank pit after removal Laboratory analytical results of soil and <br /> groundwater samples taken during the excavation showed no impact by petroleum hydrocarbons <br /> to the soil, but groundwater was impacted These elevated concentrations of petroleum <br /> hydrocarbons may have been from the rinsing of the tanks in preparation for removal and not <br /> from leaking USTs Much lower concentrations of petroleum hydrocarbons were detected in <br /> monitoring wells subsequently installed at the site as described in Section 3 0 and included in <br /> Table 3 <br /> W 192054 0002kiosure-addendum doe 1 <br />