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TN4.FE N T <br /> RT <br /> ENVARONNI" I A, <br /> I. N-T— <br /> "o A-Q ,l " <br /> I Prol"rfl'.'? <br /> I kill <br /> R J1 <br /> 2 <br /> g <br /> Tel'--phone: (210 9 .16 <br /> F _209 464-0 <br /> Kasep F'dtv. R F 11.S <br /> ENTERPRISE INVESTMENTS APR 17 9-0F <br /> CIO MONTY AND LAURA WARREN <br /> 1052 AMELIA DRIVE <br /> LONG BEACH CA 90807 <br /> RE: Enterprise Investments SITE CODE: 711 <br /> 355 Enterprise Place <br /> Tracy, California 95376 <br /> San Joaquin County Environmental Health Department (EHD) has met with the Central <br /> Valley Regional Water Quality Control Board (CVRWQCB) to address concerns after <br /> being denied access to the property at 315 Enterprise Place., adjacent to the above- <br /> referenced property. By letter dated March 1, 2006, EHD approved the ad�,-ancernent of <br /> two soil borings at this property to fifteen feet below surface grade (bs-) to investigate <br /> 'D 1� -1 <br /> soil and groundwater contamination east of the former underground storage tank site. <br /> ol <br /> CVRWQCB supports EHD's decision to waive installation of the offsite borings, <br /> previously approved by EHD, at this time. Please proceed with the advancement of the <br /> two onsite soil borings to fifteen feet I)sg to dtlinoatc soil and groundwater contamination <br /> lateraliv to the southwest and south. One borehole will be located approximately SO feet <br /> southwest of extraction well EW-1, and one borehole will be located approximately 80 <br /> feet south of EW-1. <br /> By letter dated March 1, 2006, EHD recommended that one additional boring, located <br /> baffivay between the former UST and monitoring well MW-5, be advanced to <br /> approximately thirty feet hs_g, or deeper if necessary, to delineate the vertical extent of <br /> impacted mpacted soil at this site. Please ainend Additional Site Asse,qsniew ff/ork Plan, dated <br /> February 7. 2006, to include this borehole; and, at the recommendation of'CVRWQCB, <br /> please amend this work plan to include additional borings, advanced to approximately ten <br /> feet bsor, to delineate soil and groundwater contamination west of monitoring well MW-3. <br /> By letter dated March 1, 2006, EHD directed you to evaluate the potential for vapor <br /> intrusion inside ng i ide the building located onsite and the building located at 315 Enterprise <br /> t:> <br /> Place., Tracy, California. Please submit a work plan to EHD by May 31- 2007, that will <br /> assess the potential for vapor intrusion into the existing onsite building only, or provide a <br /> rational, with technical support, for discounting vapor intrusion into the building as a <br /> potential hazard for this site. <br />