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V rf <br /> Second Quarter 1997 Groundwater Monitoring Report <br /> . Moore Petroleum, 14800 W Frontage Rd,Manteca,CA <br /> September 11, 1997 <br /> Page 4 <br /> Generally, it appears that concentrations of TPH, as gasoline, and BTEX have declined significantly <br /> at the site since remedial activities began This indicates that both remedial activities and natural <br /> attenuation have decreased concentrations of TPH, as gasoline, and BTEX at the site Based on <br /> quarterly monitoring result trends at the site, and the RBCA Tier 1 evaluation, Apex will conduct <br /> soil borings to confirm the absence of TPH, as gasoline, and BTEX at the site Upon receipt of <br /> analytical soil boring results, determining that TPH, as gasoline, and BTEX are not present above <br /> action levels at the site, Apex will submit soil boring results in a closure request to the San Joaquin <br /> County Environmental Health Division following Appendix B of the Tri-Regional. Guidelines <br /> Once a"No Further Action' letter is received, Apex will then properly abandon the nine <br /> groundwater morutonng wells and the two Reinjection Wells <br /> Based on the analytical results of the two domestic wells (DM-1 and DM-2), Apex re-sampled <br /> these two wells on August 31, 1997 Once we receive the analytical results, we will report them <br /> with the results of the closure verification soil borings <br /> REPORT DISTRIBUTION <br /> Apex submitted copies of this report, in final form, to <br /> 1 Ms E Thayer <br /> Central Valley Regional Water Control Board <br /> 3443 Routier Road, Sunte 'A' <br /> Sacramento, California 95827-3098 <br /> 2 Ms M Lagono <br /> San Joaquin County Environmental Health Division <br /> Post Office Box 2009 <br /> Stockton, California 95201 <br /> 3 Mr Craig Mitchell <br /> San Joaquin Valley Unified Air Board <br /> 4230 Kiernan Ave , Suite 130 <br /> Modesto, California 95356 <br /> REMARKS AND SIGNATURES <br /> The interpretations and/or conclusions contained in this report represent the professional opinions <br /> of Apex Envirotech, Inc These opinions are based on currently available information and were <br /> developed in accordance with currently accepted geologic, hydrogeologic and engineering practices <br /> • at this time and for this specific site Other than this, no warranty is implied or intended <br /> A 1QMR0797 WPD <br />