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PUBLIC HEALTH SERVICES <br /> � 1L� <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor Stockton, CA 95202 iFi <br /> 209/468-3420 <br /> AMERCO REAL ESTATE CO JUN 13 2000 <br /> DOUG DUNHAM <br /> 2721 N CENTRAL AVE STE 700 <br /> PHOENIX AZ 85004 <br /> RE: U Haul# 709-50 Site Code: 1772 <br /> 2701 N. Wilson Way RO# : 00574 <br /> Stockton, CA-,95215 <br /> San Joaquin County Public Health Services,Environmental Health Division (PIS-EHD) has <br /> reviewed the March 21, 2000 "Additional Site Charactenzation Report" submitted by Blaes <br /> Environmental Management (BEM) on April 28, 2000 and has the following comments. <br /> This report covers recently installed monitoring wells on site at the direction of PJS-EHD. The <br /> data collected for this phase made a diligent effort to complete the investigation of this site. Many <br /> is much closer to evaluating remedial action alternatives. <br /> questions were answered and this site <br /> Although many soil samples were collected and analyzed from many points around the site, some <br /> areas remain undefined as to the vertical and lateral extents of contamination. Soil data to support <br /> some vertical extent conclusions and inferred lines of lateral limits of contamination is missing so <br /> PHS-EHD does not agree with the statement, "Blaen Erzrirnvar-ntal bas defined tbeprobahle lateral and <br /> u tuul ectent of h)drorarbom in soil". Soil and groundwater data is missing from the east/southeast <br /> quadrant,east of MW-4A-B, (in Wilson Way area) and is to be collected before this site may <br /> progress to the Remedial Action phase. <br /> Additionally, by not sampling all of the monitoring wells during the February 2000 sampling event, <br /> PHS-EHD is unable to evaluate the correlation between existing deep soil contamination and deep <br /> groundwater conditions. There appears to be some discrepancies between the labeling of the <br /> casings in the nested wells. PHS-EI-ID has found conflicting data for these casings. The total well <br /> depths noted by the sampling technician do not match the boring logs in the report, or the field <br /> notes taken by PHS-EHS staff during the installation of these wells. It seems that groundwater was <br /> obtained only from the shallow casings of the new nested wells where the total depth was reported <br /> at just less than 50 feet below ground surface (`bgs). If this was the case, it does not allow for a full <br /> evaluation of the deep soil contamination and the correlation to the groundwater conditions at those <br /> depths contaminated soil was detected. Additional vertical soil investigation is warranted at"DP-4 <br /> and DP-6" areas. Groundwater conditions at 120' and 125' bgs need to be addressed. <br /> Iii inion of San Joaquin Countv Health Care Services <br />