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�./ LI <br /> 2402 Pacific Avenue <br /> Page 2 <br /> southeast of MW2. The contamination evidenced in samples collected from MWl and <br /> B3 will require at least two monitoring wells northwest of B3 and southwest of MW1 . <br /> Also, the groundwater sample from B8 did not undergo analysis and no groundwater <br /> sample was collected from B5, so the boring proposed 50 feet east of 68 may be <br /> unnecessary. It is PHS/EHD's understanding that there was no indication of soil or <br /> groundwater contamination from samples collected from 88; therefore, the additional <br /> 50 feet east between B8 and the proposed location for further investigation, may be <br /> excessive. Please re-evaluate the proposed location east of 38. <br /> PHS/EHD concurs with the proposed locations for additional investigation north of 67 <br /> and east of MW4. <br /> As noted above, monitoring wells will be required to define the extent of the <br /> groundwater plume rather that additional Geoprobe borings. The groundwater sample <br /> results from the previous Geoprobe investigation did provide valuable information <br /> regarding the extent of soil and groundwater contamination; however, given the <br /> results obtained to date, PHS/EHD will require that a hollow stem auger drill rig be <br /> used to install the required monitoring wells and to collect the additional soil samples <br /> necessary to define the extent of soil contamination. Also, consideration should be <br /> given to the installation of at least one vapor extraction well and an air sparge well, so <br /> that feasibility analysis can be performed since active remediation will be required at <br /> this site. <br /> Furthermore, PHS/EHD indicated in correspondence dated November 5, 1996, that a <br /> proposal for the installation of additional groundwater monitoring wells must be <br /> included with the results obtained from the prior investigation. <br /> Please submit a revised addendum incorporating PHS/EHD's comments. Once <br /> PHS/EHD has reviewed and approved the revised addendum, you should obtain pre- <br /> approval from the State Water Resources Control Board Clean--up Fund Unit to ensure <br /> that the costs will be reimbursable. <br /> If you have any questions, please do not hesitate to contact me at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Hea Division A�0 , <br /> Mary Meays, Senior REHS Margaret Lagorio, REHS <br /> Site Mitigation Unit Supervisor <br /> MM/2402PAC.MS <br /> cc: Elizabeth Thayer, CVRWQCB cc: Cleanup Fund Unit <br /> cc: Peter Batt, 2376 E. Armstrong, Lodi CA 95240 cc Bob Marty, AGE <br />