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-R���� <br /> . Working To Restore Nature <br /> described in EPA publication SW-846 be used to determine the necessary number of samples <br /> In this case, the recommended number of samples calculated according to SW-846 was <br /> approximately 13 RESNA recommends the analysis of fifteen 4 1 composite samples, or <br /> approximately one per 100 cubic yards, in order to verify diminishing concentrations of <br /> contaminants. SW-846 calculations are included in Attachment 3. <br /> To further reduce dissolved hydrocarbons in the groundwater, pooled water in the open <br /> excavation should be removed by pumping and discharged to the City sanitary sewer under <br /> permit As an alternative, pumped groundwater could be treated on site prior to discharge <br /> Treatment could consist of temporary storage and aeration in a portable storage tank, with <br /> subsequent discharge to surface under appropriate permits In addition, the remaining portion <br /> of well MW l should be removed or properly abandoned/destroyed, and the remaining wells <br /> (MW2, MW3, MW4) should be monitored for groundwater quality and depth to water <br /> i <br /> If you have any questions or comments please call our office at (209) 838-3507 <br /> Respectfully, <br /> RESNA Industries Inc <br />• Tom J Lutterman <br /> Staff Geologist <br /> rnP ne <br /> ologist <br /> Gregory P Stahl <br /> CA Registered Geologist No 5023 <br /> TJLlggk <br /> cc John Dieckman <br /> CRWQCB <br /> 1500591SXR-0194 FNL 5 <br />