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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOA UIN COUNTY <br /> Program Coordinators <br /> x <br /> Donna K. Reran, 11.H.S; I <br /> Director 304 East Weber Avenin,Third Floor Carl Borgman,R-E.H.s_ <br /> Laurie A. Cotulla,R.E.HS. Stockton,California 95202-2708 Mike Huggins,R,E;H.S.,R.I)_I_ i <br /> Assistant Director <br /> Telephone: (209),468-3420, Margaret Lagorio,R,E.H.S: <br /> c ,a pRobert McClellon,R.E.H,S: <br /> Fax;(209)-464-0138 Jeff Carruesco,R.E.H.S:. I <br /> Website:www.sjgov.org/ehd/ Casey Foley R.E.H S. <br /> KASHMIR SINGH & DALWINDER DHOOT NOV 2 7 2006 <br /> 15600 s iXARLAN ROAD <br /> LATHROP CA 95330 <br /> RE: Joe's Place SITE CODE: 231585 <br /> 15600 Harlan Road <br /> Lathrop, Ca' <br /> Sart Joaquin County Environmental Health department (EHD) has reviewed the <br /> "Additional Groundwater Assessment Work Plan" dated October 2 , 2046, prepared by <br /> Environmental Remediation Group for the above referenced site. The work plan <br /> proposes drilling of up to seven boreholes with installation of up to 13 monitoring wells. <br /> EHD is not approving the work plan because sufficient justification forand details on, <br /> construction of the monitoring wells was not provided. EHD directs that a new work plan <br /> be submitted teased on.the following comments. <br /> The contaminant of concern at this site is MTBE. It appears the MTBE contamination in <br /> :the groundwater has migrated from the former UST location in the northwest-portion of <br /> the site northeasterly to the areas of MW2, MW3, MW8, MW9, MWO-2, MW11 and in <br /> December 2005 arrived at MW4-3. In the second quarter of 2006 reportedly there was <br /> ai variable groundwater flow from northeast to northwest; The concentrations of MTBE <br /> decreased in MWO-2 and MW11 in the second quarter 2006. The hlghest: <br /> concentrations of MTBE in the second quarter of 2006 were found in the samples from <br /> :MW3, MW8, and MW9. Monitoring wells MW3 and MW9 have wells screens in the first <br /> sand interval (Sand A)and MW8 has a well screen in the second sand interval {Sand l3). <br /> The third sand interval {Sand C}has not been investigated by installation Ofa monitoring <br /> W611 screened at that depth. Since the groundwater in Sand B (MWB)has been <br /> impacted, Sand C must be investigated for vertical definition, Since the highest <br /> concentrations of MTBE are in the area of MW3, MW8, and MW9, it would be justifiable <br /> to investigate Sand Gin this area. Justification for installation of additional monitoring <br /> wells in$.and C must be provided. <br /> The lateral extent of the MTBE contamination north to northwest of MVSl2 and MWd-1X <br /> in Sand A and Sand.B has not been investigated. Installation of monitoring wells in the. <br /> Sand A, Sand B and Sarid C intervals would be justifiable north to northwest of the MW2' <br /> location: :Depending dh results from the third quarter 2006 sampling and monitoring of <br /> the existing wells, installation of Sand A monitoring wells north 0f MW4-3 and northeast <br /> of MWI I may be justifiable. <br /> The work plan proposed installation of two 2-inch well casings in a borehole but did hdt' <br /> detail the diameter of the.borehole. In order to have a 2-inch grout seal ar6Uhd each <br /> casing the borehole would have to be a minimum of 10 inches in diameter. The work <br /> plan proposed a total depth of the boreholes to be 55 feet below ground surface (bgs)... <br /> The top of Sand J was encountered at 50 to 65 feet bgs, therefore total depth of the <br /> boring must be specific to the location of the boring. <br />