Laserfiche WebLink
4 <br /> San Joaquin County DIRECTOR <br /> Donna Heran,RENS <br /> Environmental Health Department <br /> >a ASSISTANT DIRECTOR <br /> " 600 East Main Street Laurie Cotulla,REHS <br /> ¢; <br /> Stockton, California 95202.3029 PROGRAM COORDINATORS <br /> .° Carl Borgrman,REHS <br /> Mike Huggins,REHS,RDI <br /> cF kci�z� Website: www.sjgov.orglehd Margaret Lagorio,REHS <br /> Phone: (209)468-3420 RobertMcClellon,REHS <br /> Fax: (209)464-0138 Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> February 27, 2008 <br /> Dalwinder Dhoot Kashmir Singh Dhoot <br /> 15600 S. Harlan Road 5300 Penny Lane <br /> Lathrop, CA 95330 Pleasanton, CA 94588 <br /> Sub1ect: Joe's Place Site Code: 231585 <br /> 15600 Harlan Road <br /> Lathrop, CA <br /> San Joaquin County Environmental Health Department {EHD} has reviewed the "Quarterly <br /> Groundwater Monitoring Report, Fourth Quarter 2007" dated January 28, 2008, prepared by <br /> Stratus Environmental, Inc. (your consultant) for the above referenced site. In a telephone <br /> conversation with Dalwinder Dhoot, it was requested that the EHD comment on the site after <br /> review of this report. <br /> The concentrations of MTBE in the groundwater samples collected from the on-site monitoring <br /> wells have declined since the first monitoring wells were installed in February 2000 (highest <br /> concentration at that time was 2800 micrograms per liter). The highest concentration of MTBE <br /> (150 micrograms per liter) found in the groundwater samples collected in December 2007 was <br /> from on-site monitoring well MWQ-1X, that is located about 50 feet northeast of the area of the <br /> former underground storage tanks>and at the northwest property line. <br /> The MTBE in the groundwater has migrated with the flow of the groundwater from the former <br /> underground storage tank area, initially to the northeast and more recently to the northwest. <br /> There are monitoring wells on the northern, southern, eastern and western borders of the 3.77 <br /> acre parcel north of this site. All of these wells except the well in the northeast corner of that <br /> parcel have had concentrations of MTBE in the groundwater samples collected from them with <br /> current concentrations ranging from 13 to 120 micrograms per liter. The MTBE contamination <br /> appears to have spread across and contaminated the groundwater beneath most of that 3.77 <br /> acre parcel. Because the concentrations of MTBE are relatively low compared to other sites, <br /> there are no identified drinking water wells threatened by the plume of contamination and the <br /> contaminant plume has spread over a Targe area, cost-effective active remediation has not <br /> been established. <br /> Can August 2, 2007, Jim Barton from the Central Valley Regional Water Quality Control Board <br /> and I met with Sarah Salcedo and Gowri Kowtha from Stratus Environmental. At the meeting It <br /> was discussed that remediation by natural attenuation was probably not viable and that <br /> groundwater extraction and treatment may be the most viable option for the site. At the <br />