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San Joaquin Coun},, DIRECTOR <br /> Q `7 Donna Heron,REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> 6x00 East Main Street <br /> Laurie Gotuila,REHS <br /> PROGRAM COORDINATORS <br /> .,; Stockton, California 95202-3029 Carl Borgman,REHS <br /> Mike Huggins,REHS,RDI <br /> °�6i610`' Website: www:sjgov.org/ehd Margaret t.agorio,REHS <br /> RobertMcClellon,REHS <br /> Phone: (209)468-3420 <br /> JeffGarruesco,REHS,RDI <br /> Pax: (209)464-0138 Kasey Foley,REHS <br /> MAY $ 570V <br /> DALWZNDER DHOOT KASHMIR SINGH DHOOT <br /> 15600 S HARLAN ROAD 5300 PENNY LANE <br /> LATHROP CA 95330 PLEASANTON CA 94588 <br /> RE: Joe's Place SITE CODE: 231585 <br /> 15600 Harlan Road <br /> Lathrop, Ca <br /> San Joaquin County Environmental Health Department (EHD) has reviewed the <br /> "Interim Remedial Action Plan Revision V (IRAP)dated January 24, 2007 and <br /> the "Additional Groundwater Assessment Report" (Report) dated April 16, 2007, <br /> prepared by Environmental Remediation Group for the above referenced site <br /> and provides the following comments. <br /> EMD does not approve of the CRAP, given the anticipated cost for Option 1 is <br /> $386,000 and for Option 2 is$603,000. The current highest concentration of <br /> MTBE in groundwater samples is in off-site monitoring well (M ) 9 at 129 <br /> micrograms/[!ter (ug/1), according to the MTBE Isocontour Map dated February 6, <br /> 2007. Although the plume is expansive, given the highest concentration in <br /> groundwater is 129 ug/I, an expenditure of$386,000 to $603,000 for interim <br /> remediation would be difficult to justify and may not be approved for <br /> reimbursement from the State Water Resources Control Board Cleanup Fund <br /> (CUF). In a telephone conversation with CUF staff, EFID was informed that their <br /> office should preapprove reimbursement for any high cost remediation. The cost <br /> to treat the extracted water to meet all requirements of the City of Lathrop for <br /> disposal to the public sewer as well as other options should be evaluated. <br /> Additionally, it may be appropriate to evaluate the effectiveness of groundwater <br /> extraction by performing extraction and disposal fora shorter period (i.e. once a <br /> week for a month). <br /> The Report documented the installation of off-site wells MWI2C, MW13A/B, <br /> MW13C, MW14A, MW14B, MW15A_and MW15B, that the analytical results of <br /> the soil samples collected during installation of the MW's were non-detect and <br /> that the initial results of groundwater sampling indicate that the MTBE <br /> contamination is not defined. The Report states that there is evidence that Sand <br /> C has been impacted since the water sample from MW13C contained 2.9 ug/I of <br /> MTBE. Sometimes during construction of monitoring wells cross contamination <br /> occurs. Additional sampling of MW13C as well as MW 12C will confirm whether <br /> Sand Chas been impacted. Additional sampling of MW 1 A/B and MW 15A are <br /> needed to confirm the initial detections of MTBE in those well samples. The <br /> need for installation of additional wells will be determined after further sampling <br /> of the new wells. <br />