Laserfiche WebLink
r <br /> • WWI <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> 'Wry. ` <br /> oP..... SAN JOAQUIN COUNTY <br /> �—'--. Unit Supervisors <br /> —. � Donna K.Heran,R.E.H.S.' 304 East Weber Avenue, Third Floorj. Carl Borgman,R.E.H.S. <br /> Director <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> Douglas W.Wilson,R.E.H.S. <br /> • .. �P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> <<FOR Laurie A.Cotulla,R.E.H.S. <br /> Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> JUN 1 2 2003 <br /> ROGER BISHOP <br /> PILKINGTON NORTH AMERICA INC <br /> P O BOX 128 <br /> LATHROP CA 95330 <br /> RE: Libbey Owens/Pilkington North America SITE CODE: 1816 <br /> 500 E. Louise <br /> Lathrop, CA <br /> San Joaquin County Environmental Health Department (EHD)was contacted on <br /> June 12, 2003, by Condor Earth Technologies on your behalf regarding our June <br /> 4, 2003, letter approving the work proposed for the above referenced site. <br /> It was pointed out that the work plan did not propose collection and analysis of <br /> soil samples from the five push borings proposed to further investigate the <br /> underground storage tank (UST) removed in 1997, only groundwater samples. <br /> After further review of the site information at the time of the (UST) removal in <br /> 1997 and the previously approved work plan, EHD provides this letter to clarify <br /> what is required for further investigation of the removed 1997 UST area. <br /> A cement slab that was below the UST was left in place when the UST was <br /> removed and the soil samples obtained were from the sidewalls of the excavation <br /> at a depth of 12 feet. The soil sample from the west wall was reported to have a <br /> concentration of .006 mg/kg of MTBE. Therefore, soil samples must be collected <br /> at a depth of 12 feet or greater to show the extent of this contamination. Since <br /> there is a cement slab beneath the former UST location, performing a direct push <br /> boring and 6ollecting a soil sample at 12 feet or below in the center of the former <br /> UST location is not feasible, so that push boring can be removed from the <br /> planned work. The work plan proposed pushing to about four feet below <br /> encountered groundwater, anticipated to be about 10 feet below surface grade, <br /> and collecting a groundwater sample. The four direct push borings proposed <br /> around the former UST location must be pushed to a depth of 12 feet or greater <br /> and a soil sample collected. Groundwater samples must also be collected from <br /> the four push point locations. <br /> Please ensure that detection limits for constituents of concern are appropriate. <br /> For example, most laboratories can achieve detection limits of .005 mg/kg for soil <br /> samples and .5 ug/I for water samples when analyzing for BTEX, MTBE, TAME, <br /> ETBE and DIPE. <br />