Laserfiche WebLink
i <br /> I <br /> R,4M 1 SUBSURFACE IP1Y£511BAMON'Ell Lls R6 ORT <br /> ?! 1605 South a Dorado.Stockton,UROM'a <br /> M� Selected soil samples were delivered under chain-of-custody, to a state- <br /> certified analytical laboratory for analysis of concentration of: a} total <br /> PPH as gasoline; b) benzene, <br /> t� purgeable petroleum hydrocarbons R ) <br /> toluene, ethylbenzene,total xylenes (BTEX); c) ethylene aibromide (I_oBY <br /> and d) ethylene dichloride {EDC}. In addition, the stockpiled soil was <br /> sampled for organic lead. <br /> iOn July 11, 1991, the groundwater monitoring wells were developed, <br /> F purged, and sampled. <br /> .4 <br /> The groundwater samples were delivered under chain-of-custody,to astat®- <br /> w©! certified laboratory for analysis of concentrations of: a}TPPH as gasoline; <br /> b) BTEX; c) EDB; d) EDC; and e) total lead. <br /> The top-of-casing elevation of each well was surveyed by a surveyor <br /> w� licensed in the State of California. <br /> The field and laboratory data was reviewed and a factual report of this <br /> investigation was prepared. <br /> 4612,0 BACKGROt1ND INFORMATION <br /> 2.1 Site Descrl tion <br /> R The subject site is located be South EI Rorado Avenue arThCanter s ssituated in t in the City <br /> i 1 of Stockton, San Joaquin County, California (Figure 1). <br /> is bound on <br /> commercial/residential/light industrial area of so t hEl Dorado Avenue, onon. The thesouth by <br /> F the north by East 2nd Street, on the east by Sou <br /> 'i a car wash facility, and on the west by Center Street. <br /> r � <br /> }; <br /> The Exxon service station is presently an active station. The store retails regular-leaded, ! <br /> lines. <br /> regular-unleaded,and extra-unleaded gesoround storage�tankslf(UST) withincludeities associated� <br /> three dispenser islands, and three underground <br /> product piping. The three USTs are located immediately south of the dispenser islands <br /> z on the southern half of the site. The type of construction and the installation dates of the <br /> USTs are,unknown. Figure 2 shows thetha tank inventory alocation of the t the siteVeground and <br /> underground features. Table 1 summarizes <br /> `4H 2.2 Pr _I r_ve tl atlon <br /> x <br /> On February 5, 1991, a ground penetrating radar (GPR) survey was performed by <br /> NORCAL , of Petaluma, California. The survey <br /> - ---------NORCAL-Geophysical-Consultants, lnc_(_ ) _ ___ <br /> I " was performed In the area of the existing UST basin to locate existing-underground <br /> facilities for avoidance during drilling. Upon completion of the GPR survey, two sail <br /> 1990, at an angle of 30 degrees from vertical, <br /> borings were drilled on February 22, <br />