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., <br /> r �{ <br /> P nr�m­ <br /> The Atchison) Topeka and Santa Fe Railway Company <br /> 5770 South Eastern Mcnlic <br /> ! s Angrles,C,LliFurnia 90040 (213) 889-7767 <br /> April 16, 1991 <br /> File: 01001915 - 4 `h <br /> San Joaquin County Public Health Services APR <br /> Environmental Health Division <br /> 495 North San Joaquin Street �NVfi�C)i��f�E�4�fRL k-iEEiLT <br /> P. 0. Box 2009 wfzPlliT/SEfZVIE:ES <br /> Stockton, CA 95201 <br /> RE: Investigation of contamination associated with former vaulted tanks and UST's <br /> Iocated at 1033 East Scotts Avenue, Stockton, California <br /> Dear Sirs: <br /> As you are aware, borings at the site have indicated that soils tinder these tanks are <br /> contaminated with hydrocarbons. Three wells were recently installed to determine if <br /> groundwater has been impacted. 1 have enclosed, for your review, the March 1991 Final <br /> Site Assessment Report detailing the results of the investigation. <br /> Samples collected from the wells did contain w_ry low levels of some high boiling point <br /> hydrocarbon. However, the laboratory does not characterize these detections as diesel. <br /> The laboratory technician said that it could be any kind of naturally occurring organic <br /> matter. No benzene, toluene, ethylbenzene or xylenes were detected in any of the well <br /> samples. <br /> In light of these most recent results, I have contracted with EPM-West to conduct the <br /> following work as outlined: <br /> r <br /> 1. Better define extent of contaminated sol[ and determine if it is hazardous <br /> waste: <br /> U Prepare brief addendum to current work plan. <br /> O Install three borings. <br /> Analyze soil samples. <br /> O Prepare brief report or findings to be entered as Appendix K to the <br /> attached March 1991 Site Assessment Report. <br /> 2. Conduct quarterly monitoring and sampling of the three monitoring wells: <br /> • Determine groundwater gradient and direction. <br /> • Analyze for TPH and BTEX. <br /> • Submit brief report to San Joaquin County. <br /> ° Begin last week of April 1991. <br /> As soon as the extent of the soil contamination is defined (Appendix K), the Site <br /> Assessment Report will be submitted to various remediation contractors. Their proposals <br /> will be reviewed and a remediation work plan submitted for the technique selected. <br /> 8 San la Fe Soatherrm Pacific company <br />