|
Mr. Harlin Knoll
<br /> n
<br /> Checklist for No Further Action Request and Monitoring Well Destruct;� _ .WEB
<br /> ZQ1Q
<br /> September 29,2010
<br /> Page 2 ENVIRONSNT RVH
<br /> ICES
<br /> PERMITI
<br /> Table 1
<br /> Checklist of Required Data for No Further Action Request
<br /> Western Oil and Spreading,Inc.,Acampo Plant Site,Acampo, California
<br /> Western Oil and Spreading,Inc.,Acampo Plant Site
<br /> Site Name and Location: 19356 N.Highway 99,Acam o,San Joaquin County,California
<br /> The sensitive receptor survey conducted in 2003 identified 63
<br /> L 1. Distance to production wells for municipal, domestic and agricultural water supply wells within the 2,000-foot
<br /> ® domestic,agriculture,industry and other uses search radius. In addition,the water wells in the vicinity of the site
<br /> within 2000 feet of the site, are cased below 300 feet,due to concerns of brine infiltration from
<br /> the Victor Fine Foods Facility.
<br /> 2. Site maps, to scale,of area impacted showing Attachment A contains Figure 2,which is a map showing the
<br /> locations of any former and existing tank location of the former ASTs1/USTs2,buildings,streets,etc.
<br /> ® systems,excavation contours and sample Monitoring wells,former soil borings,and sample locations are
<br /> locations,boring and monitoring well elevation also shown. Also in Attachment A is Figure 3 from the March 26,
<br /> contours,gradients,and nearby surface waters, 2010 report,which shows the most recent groundwater elevation
<br /> buildings,streets,and subsurface utilities, contours and gradient.
<br /> L Attachment A contains geologic cross sections from the March 26,
<br /> 2010 report. Subsurface soils identified at the site consist primarily
<br /> ® 3. Figures depicting Litho ams{cross section), of interbedded layers of sands,silty sands,and clayey sands. Site
<br /> treatment system diagrams; soils have been characterized to a maximum depth of 60 feet BGS3
<br /> L beneath the site and 70 feet BGS at well MW-7.
<br /> No soil was stockpiled on site. All soils generated during
<br /> ® 4. Stockpiled soil remaining on-site or off-site excavation activities and other subsurface investigations are
<br /> disposal(quantity); resumed to have been disposed properly.
<br /> L Seven monitoring wells remain on site,and will be destroyed after
<br /> the NFA letter has been issued. Documentation of well destruction
<br /> ® 5. Monitoring wells remaining on-site,fate. will be provided within 90 days of performing the well
<br /> 1 destruction.
<br /> LAttachment B contains tabulated historical groundwater elevations
<br /> and depths-to-water which were included in Appendix B of the
<br /> March 26,2010 report. Groundwater elevations have ranged from
<br /> ® 6. Tabulated results of all groundwater elevations -2.39 to 8.57 feet MSL,with an average elevation of 4.4 feet MSL.
<br /> and depths to water; Historically,the direction of groundwater flow beneath the site has
<br /> been to the north/northeast and the gradient has varied from
<br /> A
<br /> approximately 0.001 to 0.008 feet per foot.
<br /> LAttachment B contains historic data of sampling conducted at the
<br /> 7. Tabulated results of all sampling and analyses: site,well installation,and quarterly/semi-annual monitoring and
<br /> ® ® Detection limits for confirmation sampling was also contained in Appendix B of the March 26,2010 report.
<br /> Total lead analysis was performed and listed under Table 6 of a
<br /> ® Lead analyses previous consultant's report dated November 5,1987(Attachment
<br /> C.
<br /> Recent data reveals that due to the non-detection of TPHM05 and
<br /> L8. Concentration contours of contaminants found TPHD6,contaminant contours in soil and groundwater have not
<br /> and those remaining in soil and groundwater, been calculated. Historic analytical data is included in Attachment
<br /> and both on-site and off-site: B and in the March 26,2010 report. In addition,SHN has
<br /> L described soil and groundwater impacts over the course of the site
<br /> ® Extent of soil contamination investigations within the March 26,2010 report. This information
<br /> ® Lateral ® Vertical has been described in Sections 4.5(Extent of Petroleum
<br /> L Extent of groundwater contamination Hydrocarbon Impacted Soil)and 4.6(Extent of Petroleum
<br /> ® Lateral ® Vertical Hydrocarbons in Groundwater). See also Figures 6 and 7(in
<br /> Attachment A),which include historic soil analytical results as well
<br /> as historic TPHD concentrations in groundwater.
<br /> L
<br /> \\Eureka\Projects\2007\007152-WOS\PUBS\rpt\20100929-NFA.doc C,_II
<br /> L
<br />
|