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30 March 1999 <br /> AGE-NC Project No 96-0263 <br /> Page 2 of 7 <br /> Total petroleum hydrocarbons quantified as gasoline (TPH-g), purgeable aromatics - benzene, <br />' toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary butyl ether (MTBE) were <br /> detected in each of the samples analyzed at concentrations exceeding the method detection Iimits <br /> TPH-g was detected in soil samples at concentration up to 3,400 milligrams per kilogram (mg/kg) <br />' BTEX compounds and MTBE were detected at concentrations up to 430 mg/kg of xylene and770 <br /> mg/kg of MTBE Total lead was detected at background levels The highest concentrations of <br />' petroleum hydrocarbons were detected in soil samples collected from the product line trench and <br /> dispenser areas Laboratory results of soil samples analyzed for petroleum hydrocarbons are <br /> summarized in Table 1 <br /> 1 <br /> 3.0. PROCEDURES <br /> All field work was performed in accordance with San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control <br />' Board(CVRWQCB)guidelines for the subsurface investigations of underground storage tank(UST) <br /> sites, and following Work Plan for- Site Assessment, prepared by AGE, dated 16 April 1998 and <br /> approved by the PHS-EHD on 13 May 1998 <br /> I3 1 PROBING AND SAMPLING <br /> On 24 June 1998, a total of nine soil probe borings (B 1 thiough 139) were advanced at the site, under <br /> observation by the PHS-EHD Probe borings A ere advanced in the area of the former UST system <br /> and in step-out location north, northeast, west and south of the former UST facility Probe borings_ <br /> B 1 and B6 were advanced to a depth of 20 feet bsg Probe boring B5 was advanced to a depth oQ5 •�a <br /> feet bsg All other soil probe borings were advanced to a depth of 15 feet bsg Soil borings 138 and <br /> B9 were advanced solely for the collection of grab water samples Locations of the soil probe <br /> borings are illustrated on Figure 2 <br /> The soil borings were advanced with a Geo robe 5400 piobing unit utilizing 1 25-inch diameter <br /> probe rods Probe borings B1 through B4, B6 and B7 were sampled with a 1 5-inch diameter soil <br /> sampling assembly filled with four six-inch by 1 125-inch brass sleeves Soil boring B5 was <br /> continuously sampled (cored) using a Geoprobe macro soil sampling assembly and a 4-foot acetate <br /> sleeve, beginning at 4 feet bsg and coring continuously to total depth <br /> After collection, the ends of a 6-inch portion of the soil-filled acetate sleeve or the second brass <br /> sleeve were covered with Teflon sheets, capped and sealed with tape All samples were labeled with <br /> boring designation, depth, date and time of sampling <br /> Advanced GeolEnvironmental,Inc <br />