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Mr Daniel K Barber,P E <br /> ' September 9, 2003 <br /> . Page 2 of 17 <br /> ' by several homes (separating it from the highway 99 North frontage road)—is '/4 mile south of <br /> Woodbridge Road in Acampo, San Joaquin County, California Figure 1 is a generalized site <br /> ' location map <br /> ' PREVIOUS ENVIRONMENTAL ACTIVITIES <br /> The following summarizes previous environmental remediation and site characterization <br /> ' activities A detailed discussion of the magnitude and extent of residual soil and groundwater <br /> contamination is presented in a subsequent section of this report Appendix A contains the <br /> tabulation of analytical results provided to SES <br /> ' The site formerly utilized the following five underground storage tanks (USTs), all located in <br /> the northeastern corner of the property <br /> ' ■ Two 20,000-gallon Iiquid "cutback" asphalt <br /> ' ■ One 2,000-gallon diesel fuel <br /> 0 One 1,000-gallon gasoline <br /> 10 ■ One 500-gallon gasoline <br /> The five USTs were removed in October 1987 The approximate locations of the USTs and <br /> ' associated excavations are shown on Figure 2, Site Plan While SES was not able to review <br /> any documentation reports that may have been completed following the UST removals, we <br /> ' understand that according to the regulators, the area of former diesel and gasoline USTs to <br /> the south of the subject property near the domestic well has no contamination of concern The <br /> domestic well was also sampled and showed no total petroleum hydrocarbon (TPH) <br /> ' contamination (Wong, 2003) <br /> ' Soil contamination by hydrocarbons was observed at the location of 20,000-gallon liquid <br /> asphalt tanks in the northeastern area of the property Liquid asphalt is a long-chain <br /> hydrocarbon that likely has a similar signature as diesel fuel The reports by Gallardo & <br /> ' Associates (1999) referenced "contamination" detected in the soil excavation confirmation <br /> soil samples, specifically within the "tank cavity" of the two 20,000-gallon USTs, however, <br /> ' no additional documentation is available regarding the UST removals (e g , laboratory data of <br /> confirmation samples or a technical report) <br /> ' In response to a request from the lead regulatory agency San Joaquin County Environmental <br /> • Health Division (SJCEHD), a workplan for a preliminary site assessment was submitted <br /> (Gallardo & Associates, 1998) and implemented in March 1999 (Gallardo & Associates, <br /> Stellar Environmental Solutions <br /> ' Z—'ECIS.]-]--RvrN1 I—DKFArAc Sad.CWavaRc W k gu�WRT-8sPc atm_ <br />