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ENVIRONTMENTAL HEALTh-DEPARTMENT <br /> SAN JOA+QUIN COUNTY <br /> Unit Supervisors <br /> i< Donna K.Heran,R.E.H.S. <br /> _{ Director304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Milo Huggins,R.E.H.S.,R.D.I. <br /> Douglas W.Wilson,R.E.H.S. <br /> h _; bio- Program Manager Telephone: ( � -3420 Margaret Lagorio,R.E.H.S.� iFoo Laurie A.Cotulla,R.E.H.S. <br /> Program Manager Far: (209) 464-0138 Robert-McClellan,R.E.H.S, <br /> g Mark Barcellos,R.E.H.S. <br /> KASHMIR. SINGH & DALWINDER DHOOT MAY 3 1 2005 <br /> 1.5600 S HARLAN ROAD <br /> LATHROP CA 95330 <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-Revised Plan" (Plan) dated May 2, 2005, prepared <br /> by SECOR for the above referenced site. The Plan is work to evaluate the <br /> feasibility of groundwater extraction as an interim remedial action. It proposes <br /> conducting step drawdown and constant rate pump tests in MW-2, MW-3 and <br /> MWO-1X and submitting a report of the work. This work is approved. <br /> It is the recommendation of EHD that the pump test on at least one of the wells <br /> be extended to several days. If the test is extended, more samples should be <br /> collected for analysis so that contaminant concentration trends can be better <br /> evaluated. EHD also recommends that water level recoveries in the pumping <br /> wells be recorded and analyzed as a backup method for determining aquifer <br /> characteristics. <br /> The plan states that MW-1, MW6, MW-0 , and MW-01 can be monitored during <br /> the constant rate pump tests in MW-2 and MW-3. The distances from MW-2 <br /> and MW-3 to MW-1, MW6, MW-03, and MW-01 range from 80 feet to 580 feet. <br /> The pump test conducted on MW7 showed little draw down on MWA (80 feet <br /> away) or MW-3 (125 feet away). Monitoring'MW-1, MW6, MW-03, and MW-01 <br /> during the constant rate pump tests in MW-2 and MW-3 may not provide useful <br /> information. <br /> On January 31, 2005, EHD approved a work plan submitted by Stratus <br /> Environmental for the installation of two off-site shallow screened monitoring <br /> wells, one on-site shallow screened monitoring well, and one off-site deeper <br /> screened monitoring well with conditions. This work has not been completed to <br /> date. This work is to be completed prior to August 1, 2005. If MW 9 and MW 10 <br /> are installed prior to the pomp tests, they may provide better monitoring points <br /> for the pump test to be conducted on MW3. <br />