Laserfiche WebLink
i� <br /> PUBJC HEALTH SERVICES oPa �o <br /> SAN JOAQUIN COUNTY <br /> N: < <br /> JOG] KHANNA M.D., M.P.H. <br /> Health Officer <br /> P. O. Box 2009 . (1601 East Hazelton Avenue) Stockton, California 95207 <br /> � tIF ORS <br /> (209) 468-3400 <br /> April 10 , 1990 <br /> Apache Plastics <br /> Dan Crownover <br /> 2050 E . Fremont <br /> Stockton , CA 95205 <br /> We have reviewed the November , 1989 , Subsurface Investigation <br /> Report prepared for this site by Western Geologic Resources , Inc . <br /> ( WGR ) . The investigation included installation and sampling of <br /> four groundwater monitoring wells on-site . <br /> Petroleum hydrocarbons were detected in ground water near a former <br /> underground storage tank on- site . Benzene was reported at <br /> concentrations as high as 32 , 000 parts per billion . High levels of <br /> ethylene dichloride ( 1 , 2 , -DCA ) and ethylene dibromide ( EDB ) were <br /> also detected in groundwater samples . Further investigation will <br /> be necessary to determine the extent of the impact to water <br /> quality . ` <br /> According to WGR ' s February 5 , 1990 letter , WGR is currently re - <br /> evaluating plans for future work , and will attempt to find <br /> locations for additional monitoring wells . Based on the reported <br /> directions of groundwater flow beneath the site , the existing <br /> underground storage tanks on the adjacent property should not <br /> interfere with investigation of discharges at the Apache Plastic , <br /> Inc . , site . <br /> A large building occupies the area of the site lying downgradient <br /> from the former underground storage tank . The dimensions of this <br /> building are such that if wells were installed on the opposite side <br /> of the building only , they would be too far from the source of the <br /> discharge to provide adequate information about the contaminant <br /> plume . Therefore , to adequately define the extent of impacts to <br /> groundwater it may be necessary to install monitoring wells inside <br /> the building . <br /> We are also concerned about the high levels of 1 , 2 -DCA and EDB in <br /> groundwater beneath this site . We recommend that the next set of <br /> groundwater samples include analysis for other volatile organic <br /> chemicals by EPA method 601 / 8010 or 624 / 8240 . <br /> COPY <br /> A Division of San Joaquin County Heahh Gare Services <br />