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San Joaquin County DIRECTOR <br /> O u t N Donna Heran,REHS <br /> Environmental Health Department <br /> ASSISTANT DIRECTOR <br /> 2 :?� 600 East Main Street Laurie Cotufia,REHS <br /> s < Stockton, California 95202-3029 <br /> • PROGRAM COORDINATORS <br /> r r` Mike Huggins,REHS;RDI <br /> clWebsite:www.S ov.Or fehd Margaret Lagorio;REHS <br /> t�fi,osxc� Phone: 1468-3420 RobertMcClelion,REHS <br /> 209 <br /> { ) Jeff Carruesco,REHS,RDI <br /> Fax: (209)464-0138 xasey Foley,REHS <br /> December 19, 2008 <br /> Dalwinder Dhoot Kashmir Singh Dhoot <br /> 15600 S. Hanan Road 5300 Penny Lane <br /> Lathrop, CA 95330 Pleasanton, CA 94588 <br /> Subject: Joe's Place Site Code: 231585 <br /> 15600 Harlan Road <br /> Lathrop, CA <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the letter from <br /> your attorney, Kim L. Taylor, dated December 3, 2008, and your responses to the EHD letter <br /> dated August 19, 2008; concerning the above subject site. <br /> The letter proposes submitting a work plan proposing a human health and environmental risk <br /> assessment, including the collection of soil gas data for use in modeling and that monitoring <br /> wells MW5, MW6, MW14B and MWO-1 be dropped from the groundwater monitoring program <br /> and be destroyed. The EHD has discussed the letter and responses with the Central Valley <br /> Regional Water Quality Control Board (CVRWQCB) and the following items should be <br /> addressed prior to preparing an environmental risk assessment or submitting a closure request. <br /> 1') A soil gas investigation should be performed and the results compared to the San <br /> Francisca Bay Regional Water Quality Control Board Environmental Screening Levels <br /> (ESLs) May 2008, with shallow soil and residential use characteristics, for vapor <br /> intrusion and dermal contact with unrestricted use since the MTBE plume is under <br /> residential properties.. If the ESLs are exceeded then a risk assessment will be <br /> necessary. <br /> ) The MTBE plume is not defined to the northwest of monitoring well MW13AB. Since <br /> additional investigation under Interstate Five would be difficult, use of a fate and <br /> transport model such as Bioscreen, a freeware USEPA model, should be considered to <br /> show how far the MTBE will migrate and when all areas of the plume of contaminated <br /> groundwater will reach the CVRWQCB water quality goals. <br /> Quarterly groundwater monitoring should continue until this site receives a "No Further Action <br /> Required" determination from the EHD and the CVRWQCB. in a letter dated December 4, <br /> 2008, the EHD stated that the sampling frequency of monitoring wells MW5, MW6, MW14B and <br /> MWO-1 could be reduced to annual. These wells are not to be destroyed until the site receives <br /> a "No Further Action Required"determination from the END and the CVRWQCB. <br /> A work plan for collection of soil gas data should be submitted to the EHD by February 2, 2009. <br />