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L HEALTH ffEPARTMENT <br /> VIRON �, I ENT L <br /> A ITY <br /> Diwrni K. HET ran. R.E.H.S. Coorefillaroj-v <br /> dTI f3u:kman. R.F.H.S. <br /> murip k. Colull"l, R.E.H.S. '17i) R.L.H.S.. R .I. <br /> Man-,arci La,—,orio. K.E.11.S. <br /> T(-Icphone: (209)40-'420 <br /> jzobm MCC lcllor_ <br /> Fax: (209) 464-0 1 8R <br /> J efT(- I I <br /> Kasz:-, Foley" R.F H.S. <br /> ENTERPRISE INVESTMENTS APR 1 7 2007 <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, Califor-nia 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 advancement of <br /> two soil borin(1)1s at this property to fifteen feet below surface grade (hsg) to investigate <br /> soil and groundwater contamination east of the former underground storage tank Site. <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 bsc, to delineate soil and groundwater contamination <br /> laterally 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 /> halfway between the former UST and monitoring well MW-5, be advanced to <br /> approximately thirty feet bsg, or deeper if necessary, to delineate the vertical extent of <br /> impacted so]] at this site. Please amend Additional Site Assessment ff,ork- PLin, 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 bsg, to delineate soil and groundwater contamination west of monitoring we]I MW-3. <br /> By letter dated March L 2006, EHD directed you to evaluate the potential for vapor <br /> intrusion inside the building located onsite and the building located at 315 Enterprise <br /> Place, Tracy, California. Please submit a work plan to EHD by May 31, 2007, that N['"111 <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 />