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GROUNDWATER MONITORING REPORT
<br /> THIRD QUARTER 2402
<br /> BOYETT PETROLEUM
<br /> 1.0 INTRODUCTION
<br /> Condor Earth Technologies, Inc. (Condor) conducted third quarter 2002 groundwater monitoring on September
<br /> 26, 27, and 30, 2002, at the Boyett Petroleum facility (site) located at 419 S. Main Street in Manteca, California
<br /> (Figures 1 and 2, Appendix A). Condor was retained by Mr. Dale Boyett of Boyett Petroleum to provide
<br /> professional consulting services. This report was prepared at the request of Mr. Boyett.
<br /> The third quarter 2002 groundwater monitoring event was conducted at the request of Mr. Boyett pursuant to a
<br /> directive from Mr. Jeffery Wong of the San Joaquin County Environmental,Health Department (SJCEHD).
<br /> During a meeting at the SJCEHD offices on August 15, 2002, Condor personnel reviewed historical data and
<br /> discussed future work at the site with Messrs. Jeffery Wong and Nuel Henderson of the SJCEHD. The work
<br /> described in this report was conducted in response to the August 15, 2002, meeting. The primary objective of
<br /> the work was to survey the nine groundwater monitoring wells to meet the requirements of California
<br /> 1 Assembly Bill 2586, conduct a groundwater sampling event, and conduct a sensitive receptor survey within a
<br /> 2,000-foot radius of the site. This report includes site background information, a description of the monitoring
<br /> activities, sensitive receptor survey information, a description of the laboratory analytical results, a summary
<br /> Iwith conclusions, and recommendations.
<br /> 2.0 SITE BACKGROUND
<br /> On November 20 and 21, 1996, soil sampling was conducted at the site by WHF, Inc., (WHF) under the
<br /> direction of Mr. Robert McClellon of the San Joaquin County Public Health Service, Environmental Health
<br /> Division (SJCPHSEHD). According to WHF, on November 20, 1996, one soil sample was collected from
<br /> beneath each of the site's three existing fuel dispenscrs at a depth of approximately two feet below the
<br /> dispenser piping. On November 21, 1996, four discrete soil samples were collected to characterize
<br /> 1 approximately 44 cubic yards of material stockpiled at the site. The four discrete samples were composited into
<br /> two soil samples for laboratory analyses. The soil samples collected from both the dispenser locations and the
<br /> soil stockpile were analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-G) by EPA method
<br /> 8015M, and for benzene, ethyl benzene, toluene, total xylenes (BTEX), and methyl tert-butyl ether(MTBE)by
<br /> 1 EPA Method 8020.
<br /> On October 5, 1998, WHF, in conjunction with Fisch Environmental Exploration Services, completed two
<br /> vertical soil borings, SB-I and SB-2, to a maximum depth of 18 feet below ground surface (bgs) proximal to
<br /> the fuel dispenser island. Soil samples were collected at 5-foot intervals for soil classification. Three soil
<br /> samples were collected from each boring at depth intervals of 4-6 feet, 9-11 feet, and 16 feet. One groundwater
<br /> sample was collected from each boring from a depth of 18 feet for laboratory analyses.
<br /> On August 27 and 30, 1999, WHF, in conjunction with Frontier Drilling, completed four soil borings. The
<br /> borings, which varied. in total depth between 26.5 and 36.5 feet bgs, were subsequently converted into
<br /> monitoring wells MW-I through MW-4; depth to groundwater was reported to be at approximately 18 feet bgs.
<br /> Laboratory analytical results of eleven soil samples collected from the borings/wells indicated no detectable
<br /> levels of petroleum hydrocarbons with the exception of MTBE, which was detected in MW-1, MW-3, and
<br /> MW-4 at concentrations up to 200 micrograms/kilogram (gg/Kg). MTBE was detected in groundwater samples
<br /> collected from MW-1, MW-3, and MW-4 at concentrations of 2,700 micrograms per liter(pg/L), 5,700 pg/L,
<br /> �'� CONDOR
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