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' Of-Site Groundwater Investigation Work Plan Page 2
<br /> Rainwater Car Wash,Manteca, California 95336
<br /> May 30,2012
<br /> ' 3. SITE HISTORYAND BACKGROUND
<br /> ' 3.1 Property Ownership and Business Type
<br /> The site is currently owned by Mr.Fassel (Phillip)Elder and is currently occupied by a gasoline service station
<br /> ' and convenience store(Save-On Gas&Liquor Foodmart).
<br /> 3.2 Environmental History
<br /> ' The UST removal and prior assessments at the site were documented in the reports and documents listed below.
<br /> The reports and documents reviewed by AA&A were obtained from the GeoTracker database or were provided by
<br /> Mr.Elder,the current property owner and responsible party.
<br /> ' • Advanced GeoEnvironmental, Inc. (AGE),Preliminary Investigation and Evaluation Report(PIER),June
<br /> 11, 1999;
<br /> ' • AGE,Quarterly Report—Third Quarter 2000, September 20,2000;
<br /> • AGE,Sensitive Receptor Survey, September 8,2000;
<br /> • AGE,Cone Penetrometer Testing Site Investigation—Fourth Quarter 2000, February 7,2001;
<br /> ' • AGE,Ground Water Aquifer Pumping Test Report—Second Quarter 2001,May 15,2001;
<br /> • AGE, Interim Remediation Work Plan—June 2001, 21 June 2001;
<br /> t • AGE,Multi-Level Monitoring Well Installation Report—Fourth Quarter 2002,April 13,2003;
<br /> • AGE, Groundwater Extraction Well Installation Report—First Quarter 2010, February 17,2010;and
<br /> • AGE,Groundwater Remediation Report—First Quarter 2010,May 18,2010.
<br /> ' 3.2.1 Advanced GeoEnvironmental, Inc. (AGE), Preliminary Investigation and
<br /> Evaluation Report(PIER), June 11, 1999
<br /> ' Advanced GeoEnvironmental,Inc. (AGE),of Stockton,California,advanced six soil borings(P-1 through P-6)at
<br /> the site to assess the extent of petroleum-impacted soil and groundwater. Total petroleum hydrocarbons as
<br /> gasoline and as diesel(TPHg and TPHd)were detected in soil samples at concentrations as high as 390
<br /> ' milligrams per kilogram(mg/kg); dissolved TPHg and TPHd were detected in grab groundwater samples at
<br /> concentrations as high as 310,000 micrograms per liter(µg/L). Benzene,toluene,ethylbenzene and total xylenes
<br /> (collectively BTEX)compounds were detected in soil and grab groundwater samples at concentrations as high as
<br /> ' 51 mg/kg and 48,000 µg/L,respectively.Methyl tertiary butyl ether(MTBE),tertiary amyl methyl ether(TAME)
<br /> and tertiary butyl alcohol(TBA)were detected in soil and grab groundwater samples at concentrations as high as
<br /> 140 mg/kg and 310,000 µg/L, respectively.
<br /> ' 3.2.2 AGE, Quarterly Report- Third Quarter 2000, September 20, 2000
<br /> AGE installed groundwater monitoring wells MW 1 through MW5 on-and off-site to assess the extent of
<br /> ' petroleum-impacted soil and groundwater. TPHg and BTEX were detected in soil samples collected from borings
<br /> MW 1, MW2 and MW4 at concentrations as high as 85 and 6.7 mg/kg,respectively;MTBE and TAME were
<br /> detected in soil samples collected from MW 1,MW2 and MW3 at concentrations as high as 100 mg/kg.
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