Laserfiche WebLink
Former Beacon Station No 12419 April 10,2002 <br /> California wGroundwater <br /> (TPHg), the volatile aromatic compounds benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX), and the fuel oxygenate methyl-tert-butyl ether (MTBE) by Environmental Protection <br /> Agency (EPA) Method 8260B <br /> Groundwater Monitoring Results <br /> Depth-to-groundwater measurements were subtracted from the surveyed TOC elevations to <br /> calculate groundwater elevations Groundwater elevation data were used to construct a <br /> groundwater contour map as shown on Figure 2 <br /> Groundwater analytical results are summarized in Table 1 Benzene concentration data from <br /> this sampling event were used to construct a benzene isoconcentration map as shown on <br /> Figure 3 Copies of the laboratory data sheets and chain-of-custody documents are included <br /> as Attachment C <br /> Recommendations <br /> Horizon recommends continued quarterly monitoring be performed to evaluate trends in the <br /> groundwater gradient and concentrations of dissolved hydrocarbons over time Horizon has <br /> submitted a Problem Assessment Report / Corrective Action Plan, for the site which <br /> describes the nature and extent of petroleum hydrocarbons in soil and groundwater, and <br /> contains recommendations for remedial actions <br /> Report Distribution <br /> We recommend a copy of this report be forwarded to <br /> Mr Michael J Infurna, R E H S Mr Gordon Boggs <br /> Environmental Health Division CRWQCB - Central Valley Region <br /> San Joaquin County Public Health Services 3443 Routier Road, Suite A <br /> P O Box 2009 Sacramento, California 95827-3098 <br /> Stockton, California 95201 <br /> If you have any questions, please contact Horizon at (916) 939-2170 <br /> Sincerely, <br /> HORIZON ENVIRONME <br /> REXFORD X SMITH � <br /> Ce <br /> • <br /> No 5.307 <br /> Rexford Smith �� 0 4= Craig J Roth <br /> Registered Geologist No 530 Ae o>= `SFO Staff Geologist <br /> cA <br /> 419gmr02Q1 doc <br /> 141945 2 HORIZON ENVIRONMENTAL INC. <br />