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601 South Ventura <br /> Page 2 <br /> The work plan proposed only four discrete sidewall samples. I HS/EHD requests that discrete sidewall samples <br /> be collected every 20 linear feet and that at minimum four si ewall samples be collected. The PAR indicated <br /> that discrete bottom samples would be collected, only if witer does not enter the excavation. PHS/EHD <br /> requests that discrete bottom samples be collected,regardles of whether the sample is above or below water <br /> level. Groundwater was last reported in MW1 at approximately 11 feet (March 1993) although groundwater <br /> has been reported as low as 18 feet (December 1992). Residual soil contamination is documented at 17 feet. <br /> Contamination which is adsorbed to soil beneath the current water IeveI may act as a source of contamination <br /> to groundwater. <br /> The work plan proposed groundwater extraction from the open excavation. PHS/EHD concurs that <br /> groundwater extraction is an effective groundwater remedial action. Extraction will occur both during the <br /> re-excavation and following the re-excavation. One groundwater sample will be collected after the excavation <br /> has recharged. <br /> The work plan proposed that one composite sample (2 field o 1 lab)be collected from the excavated soil for <br /> characterization purposes. If however, the soil is sampled 1br use as backfill, PHS/EHD requests that one <br /> sample be collected every 25 cubic yards. If treatment is necmsary,subsequent confirmation sampling of the <br /> treated soil will also be necessary. <br /> Since the site is located within the City of Stockton boundaries,it will be necessary to secure a grading permit <br /> from the City of Stockton Building Division. <br /> Please contact PHS/EHD at least 48 hours prior to commencing field activities. PHS/EHD inspections of <br /> sampling events are an important aspect of local regulatory Dversight. If you have any questions, comments <br /> or if you wish to schedule a sampling inspection, please contact Mary Meays, Senior RENS, of my staff at <br /> (209) 468-0337. <br /> i <br /> Jogi Khanna, M.D., M.P.H. <br /> ealth Officer <br /> I <br /> Laurie A. Cotulla, REHS, Prog am Manager i <br /> Environmental Health Division <br /> LAC/MM:lb <br /> I <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: John Lane, RESNA <br /> I <br />