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1 <br /> QUARTERLY REPORT <br />' Nomellini Construction Co. <br /> 1045 West Charter Way <br /> Stockton, California <br /> December 1994 <br />' 1.0 INTRODUCTION <br />' In accordance with the request of Nomellini Construction Co (NCC), Geological Audit <br /> Services, Inc (GeoAudit) has prepared this report summarizing activities performed during <br /> the fourth quarter of 1994 at 1045 West Charter Way in Stockton, California (the site) One <br />' soil boring and three monitoring wells were installed at or near the site Groundwater <br /> samples were also collected from nine monitoring wells The purpose of the field work was <br /> to further investigate the lateral extent of petroleum hydrocarbons in soil and groundwater <br />' The location of the site is illustrated on Figure 1 A plan of the site is rllustlated on Figure <br /> 2 <br />' 2.0 BACKGROUND <br /> 2.1 Site Location <br />' The site is located approximately one-half mule west of lnteistate 5 on West Charter Way <br /> (State Route 4) in Stockton, San Joaquin County (Figure 1) SUIlounding land use is light <br /> industrial/conlmeicial A truck stop is located immediately east of the site, the propelty <br /> immediately west of the site is operated by Sunrise Sanitation <br /> 2.2 Underground Storage Tank Removal <br /> Two 1,000-gallon underground storage tanks (USTs) were removed from the site in August <br /> 1988 The tanks were used for the storage of regular and unleaded gasoline (see Figure 2) <br /> One 550-gallon waste oil UST was also removed from a separate excavation Analytical <br /> results of soil samples collected from beneath the gasoline USTs indicated that an <br /> unauthorized release of hydrocarbons had occurred Constituents were detected below levels <br /> of concern in the sample collected beneath the waste Oil tank <br /> The tank area was overexcavated in November 1988 Soil was excavated to a depth of 19 <br /> feet Soil samples were collected from the excavation and screened for organic vapors using <br /> a photo-ionization detector (PID) Organic vapor readings indicated that petroleum <br /> hydrocarbons were present at depths in excess of 19 feet Therefore, the excavation was <br /> backfilled and a site assessment was performed <br /> 0-1-71 A.&I S- 1.. <br /> 3G94 09-1026=1045 Nmwlh,,ORM2 94 <br /> I <br />