|
Groundwater was found at a depth of approximately 12 5 feet below ground surface(bgs) Several
<br /> soil samples were found to contain petroleum compounds The highest levels were found in borings
<br /> B-2 and B-3, east of the dispenser islands The soil sample from boring B-3, at a depth of 12 feet,
<br /> was reported to contain 880 ppm (mg/kg)TPH-g, with 9 2 ppm MTBE, 0 89 ppm benzene, 15 ppm
<br /> toluene, 10 ppm ethylbenzene and 63 ppm xylenes
<br /> The majority of the groundwater samples from both investigations were found to contain petroleum
<br />' compounds The lughest levels were found in samples from borings B-2, B-3 and B-5 with B-3
<br /> showing the highest levels These were all near the dispenser islands The sample from boring B-3
<br /> contained the 130,000 ppb (Aig/L) TPH-g with 21,000 ppb MTBE, 3800 ppb benzene, 18,000 ppb
<br /> toluene, 3,100 ppb ethylbenzene and 17,000 ppb xylenes
<br /> The highest levels reported in the GeoAudit investigation were from boring GB2, south of the UST
<br />' location The groundwater sample was reported to contain 13,000 ppb TPH-g, 83 ppb benzene, 840
<br /> ppb toluene, 230 ppb ethylbenzene and 1900 ppb xylenes They also reported 3,400 ppb TPH-g, 35
<br /> ppb benzene, 48 ppb toluene, 16 ppb ethylbenzene and 96 ppb xylenes in boring GB8 The boring
<br /> locations are shown on Figure 3 and the data is presented in Tables 3 and 4
<br /> Video Survey of Drinking Water Well
<br /> A video survey was completed to gather additional information regarding construction and design
<br /> of the drinking water well located at Franks One Stop, 2072 W Yosemite Avenue, Manteca,
<br /> California On November 25, 1997, Welenco removed the pump and piping from inside the well
<br /> A video survey was then completed using the top of casing as the datum The results of the video
<br /> survey are summarized in the Welenco, report (Remedy Inc., Quarterly Sampling Report for
<br /> Drinking Water Well, Franks One Stop, 2072 W. Yosemite Avenue, Manteca, California,
<br /> August 28, 1998)
<br /> The inside diameter (ID) of the well at the surface was shown to be 8 inches diameter Screened
<br /> intervals were reported from 84 to 102 feet, 104 to 121 feet, and 123 feet to the bottom of the survey
<br /> (140 feet) The static water level was reported at 16 feet depth
<br /> Tank Removals
<br /> Remedy Construction, Inc removed two 10,000 gallon diesel tanks (east end of the UST tank pit
<br /> area) on June 5, 1998 The work was completed in conjunction with upgrade of UST's at the site
<br /> The soil around the fill end of the tanks showed staiiung from green to black, and a diesel odor was
<br /> detected
<br /> The remaining four 10,000 gallon gasoline tanks (west end of the UST tank pit area) were removed
<br /> by Remedy Construction, Inc on June 10, 1998 The soil around the fill end of the tanks had a
<br /> gasoline odor
<br /> ISoil samples were taken at each end of the tanks Grab water samples were also collected at each
<br /> Remedy Inc Interim Investigation and Remediation Report September 16 1998
<br /> Frank's One Stop, 2072 W Yosemite Avenue Manteca, CA 0151IR RPT
<br /> 2
<br />
|