Laserfiche WebLink
Beacon Station No 3641 October 8, 2003 <br /> Stockton California Quarterly Groundwater Monitomn Report <br /> xylenes (BTEX), and the fuel oxygenate methyl-t-butyl ether (MTBE) by Environmental <br /> Protection Agency (EPA) Method 8260B <br /> Results of Groundwater Monitoring <br /> Depth-to-groundwater measurements were subtracted from the surveyed TOC elevations to <br /> calculate groundwater elevations Groundwater elevation data, summarized in Table 1, were <br /> used to construct a groundwater contour map (Figure 2) Groundwater level data indicate <br /> flow in the immediate site area was eastward under a gradient of approximately 0 006 <br /> Analytical data are summarized in Table I Benzene concentration data were used to <br /> construct a benzene isoconcentration map (Figure 3) Analytical reports and the chain-of- <br /> custody document are contained in Attachment C <br /> GeoTracker EIectronic Data Deliverables <br /> The analytical electronic data deliverable (EDD) is uploaded by Kiff The groundwater well <br /> measurement file EDD (GEO_WELL) for this quarterly monitoring event has been uploaded <br /> by Horizon The GEO_WELL file upload confirmation sheet is contained in Attachment D <br /> Recommendations <br /> Horizon recommends continued quarterly monitoring during the ongoing investigation and <br /> . remediation phases of the protect <br /> Horizon performed an additional groundwater investigation in February 2003 The <br /> investigation report was submitted on July 10, 2003 and included recommendations, as <br /> appropriate, for additional fieldwork to delineate the extent of petroleum hydrocarbons in soil <br /> and groundwater Ultramar is in the process of securing right-of-entry agreements with the <br /> off-site property owners to allow installation of additional off-site groundwater monitoring <br /> wells <br /> Horizon is in the process of preparing final design for the site interim remediation system <br /> The final design will then be submitted to the utility company for evaluation of electrical and <br /> natural gas requirements After utility requirements are determined and any necessary design <br /> changes are made, Horizon shall initiate the permitting process <br /> 641gmrQ303 doc <br /> Project No 1641 46 2 HORIZON ENVIRONMENTAL INC <br />