|
' QUARTERLY GROUNDWATER MONITORING REPORT
<br /> • THIRD QUARTER, 1998
<br />' Herman & Helen's Marina
<br /> Venice Island Ferry
<br /> Stockton, CA
<br />' November 23, 1998
<br />' 1 INTRODUCTION
<br /> On September 30 and October 1, 1998, Condor Earth Tcchnologirs, InL (Condor) conducted quarterly
<br /> groundwater and surface water monitoring at Herman & lielen s Marina located at Venice Island Ferry in
<br />' Stockton, ( alifornia (Figures I and 2, Appendix A) 1-he work described in this report was conducted in
<br /> accordance with sampling procedures included in Work Plan - iVlomtor Well Installation and Work Plan
<br /> Addendum, prepared by Condor and dated May 30, I997, and July 9, 1998, respectively The work plan was
<br />' conditionally approved by Mr Ronald Rowe of the San Joaquin County Public Health Servicesft-nvironmental
<br /> Health Department (PIIS/EIID) in correspondence dated July 8, 1997 The work plan addendum was approved
<br /> by Mr Rowe in correspondence dated July 27, 1998 The third quarter, 1998, monitoring described in this report
<br />' is the fourth quarterly groundwater monitoring event and the first surface water sampling event to be conducted
<br /> at the site This report was prepared at the request of Mr David Smith of Herman & Helen's Marina
<br /> Laboratory analyses of the samples collected from the monitor wells included benzene, toluene, ethyl benzene
<br /> and total xylenes (B FEX), total petroleum hydrocarbons quantified as gasoline (TPH-G), selected gasoline
<br /> oxygenate s/addttives, and selected parameters for evaluating the potential for intrinsic bioremediation Field
<br />�• analyses of monitor well purge water also included selected intrinsic bioremediation parameters Laboratory
<br /> analyses of thc, surface water samples collected from the drainage ditch (located east of the site) and the island
<br /> drainage channel (located south of the site) included BTEX, TPII-G, and selected gasoline oxygenates/additives
<br />' Additionally, a sample of untreated and treated water was collected from the facility's drinking water treatment
<br /> system for laboratory analysis of volatile organic compounds 1 his report includes a site history, a summary of
<br /> the current monitoring event (including a description of the sampling and laboratory analytical results), a
<br /> summary of the intrinsic bioremediation parameter data, and summary/conclusions
<br /> 2 SITE BACKGROUND
<br />' On October 30, 1991, Warren E Gomes Excavating, Inc , of Rio Vista, California, excavated and removed three
<br /> underground storage tanks (USTs) from the site (Figure 2, Appendix A) The USTs (TKI, TK2, and TK3)
<br /> contained gasoline and diesel fuel A small hole was found on the lower fill end of TK3 (diesel tank) Petroleum
<br />' staining and odors were noted in the soil beneath the former locations of the USTs Six soil samples were
<br /> collected by Condor from the UST excavation at depths of 9 to 12 feet below the ground surface Laboratory
<br /> analyses indicated elevated concentrations of TPH-G, BTEX, and total extractable petroleum hydrocarbons
<br />' quantified as diesel (TEPA) in the soil samples
<br /> On August 22, 1995, three hydropunch borings were drilled at the site Gasoline odors were noted in each
<br />' borehole Laboratory analyses indicated concentrations of TPH-G and BTEX in the soil and groundwater
<br /> samples analyzed from each borehole Based on the results of the August 1995, investigation, Condor
<br /> recommended additional investigation be conducted to evaluate the extent of the hydrocarbon plume On August
<br /> 29, 1996, five Geoprobe boreholes were installed at the site The results of the laboratory analyses indicated that
<br />' elevated concentrations of TPH-G, BTEX, and methyl tertiary butyl ether (MTBE) were present in soil and
<br /> groundwater samples collected from the northern portion of the site and that further investigation was necessary
<br />' to evaluate the extent of soil and groundwater contamination
<br />' �� CONDOR
<br />
|