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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> )OGl KHANNA M.D..M.P.H. <br /> Health Officer <br /> Lip R�: <br /> P.O.Box 2009�(1601 Fast Elaxclton Avenu�)0 9epdaan,California 95201 �� <br /> (209)468-3400 <br /> tiX '� <br /> PETER WALLACE ` <br /> P O BOX 99308 EEC 31 1993 <br /> STOCKTON CA 95201 <br /> RE: Hess-Dubois Cleaners SITE CODE: 2504 <br /> 348 W. Harding Way <br /> Stockton, CA 95203 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) <br /> has reviewed the "Report Environmental Assessment" dated December 21, 1993 as <br /> submitted by John P. Cummings and has the following comments. <br /> Groundwater gradient information included in this report has determined that the <br /> direction of flow of the groundwater beneath the site is to the south. This differs from <br /> historical data that shows at neighboring sites the groundwater flows to the east. <br /> Please submit to PHS-EHD your calculations along with the survey information that <br /> supports your conclusion for a southerly groundwater gradient. <br /> There are many factors that effect the groundwater gradient and PHS-EM is concerned <br /> that wells in the area may be affecting this site's hydraulic gradient. Include in your next <br /> quarterly monitoring report due April 16, 1994, a survey of wells within a half mile radius <br /> of the site. <br /> PHS-EHD recommends that monthly measurements and gradient calculations be <br /> initiated for the site to verify the groundwater direction. After confirming the gradient, <br /> additional monitoring wells may have to be installed to ensure that a downgradient well is <br /> provided Currently MW-3 is upgradient of the tank pit and is the well with the highest <br /> contamination in the groundwater. Please submit these monthly reports, complete with <br /> calculations, to PHS-EHD prior to the next month's monitoring event. <br /> Water samples from November 4, 1993 sampling event were in the custody of two Falcon <br /> Energy employees for eight (8) days prior to transfer to Greyhound Bus Lines for <br /> transport to Sparger Technoiogy,inc. Groundwater and soil samples obtained during <br /> approved site activities shall be secured by third party individuals and released to either <br /> qualified couriers or a Department of Health Services approved laboratory under chain <br /> of custody only. Under no circumstances shall owners or contractors or their <br /> representatives be allowed to transport or take custody of samples. <br /> A Dhhba of Sm jom*&QuW HaMM Cane See+leea <br />