Laserfiche WebLink
r <br /> 1"b <br /> SAN JOAQUIN COUNTY PUBLIC HEALTH SERVICES <br /> ENVIRONMENTAL HEALTH DIVISION <br /> SITE MITIGATION UNIT , Joaquin • <br /> 304 E.WEBER STREET <br /> nty <br /> STOCKTON CA 95201 Public <br /> RON ROWE Services <br /> SENIOR REHS Environmental <br /> PHONE#209 468-0342Division Health <br /> FAX#209 468-3433 <br /> Fam <br /> To: Mike Niemi From: RON ROWE <br /> Geological Technics PHS/EHD SITE MITIGATION UNIT <br /> Fax: 209-538-5852 Pages: 3 <br /> Phone: 209-538-6424 Date: Wednesday, July 07, 1999 <br /> Re: 16865 Gawne Rd, Moresco Site CC: Michael McGranahan (209-524-5075) <br /> ❑ Urgent ❑ For Review ❑ Please Comment ❑ Please Reply ❑ Please Recycle <br /> • Comments: <br /> Mr. Niemi <br /> In response to a July 7, 1999 telephone call from Mr. McGranahan I have prepared this fax. Mr. <br /> McGranahan is interested in receiving a "No Further Action" status for this site. As PHS/EHD <br /> informed you the week of June 20, 1999 your June 7, 1999 Soil and Groundwater Investigation <br /> Report (received at PHSIEHD June 14, 1999)fails to meet the criteria agreed upon by PHSIEHD <br /> and the Underground Storage Tank Cleanup Fund. <br /> The report documents the presence of MTBE at 60.5 — 61.0 feet below grade surface 10 times <br /> the concentration observed at 15.5 — 16.0 feet below grade surface in samples analyzed from <br /> the borehole completed as MW-1 (increasing concentration with depth, deeper than previously <br /> known). MTBE was previously described at 3300 ug/Kg in borehole SB-7 at 28.5—29 feet below <br /> grade surface on 6/17/96. Borehole SB-7 and MWA are lees than 10 feet apart according to <br /> Figure 2: Site Map, drawn 1113/98 (sic, MW-1 was installed 412199, drawing showing MW-1 is <br /> dated 1113/98). MTBE in soil is now documented only 28 feet from the high groundwater level <br /> observed on 418/99, alluvial material separating MTBE from groundwater described in the <br /> borehole log for MW-1 indicates minimal protection as sandy gravel,silt, and sand (between 60 <br /> and 90 feet below grade surface, water at 89 feet). Goundwater was measured on two dates <br /> approximately 40 days apart. Within that time frame depth to groundwater has changed <br /> dramatically (4 feet). The agreement included installing a monitor well, sampling and analyses <br />