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PUBLrc HEALTH SEke�ICES <br /> �..� ..o <br /> SAN JOAQUIN COt:Nn r <br /> IOGI KHANNA ivt.D.,bt.P.H. <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Huelton Avenue) Stockton. Califoniia 95201 <br /> c4Ffia`'� <br /> (209)468-3400 <br /> Cr <br /> fir%, i_I <br /> JOHN JOHNSON <br /> THE CUSTOMER COMPANY <br /> P.O. BOX 886 MAY 2 7 1992 <br /> BENECIA, CA 94510 <br /> RE: FOOD AND LIQUOR SITE CODE: 1984 <br /> 890 N. Main <br /> Manteca, CA 95336 <br /> The intent of this letter is to acknowledge receipt of your April, <br /> 22, 1992 letter, requesting closure of the above referenced site. <br /> There are many factors that must be considered prior to issuing a <br /> closure and that complicate the evaluation of a site like this. <br /> Public Health Services, Environmental Health Division (PHS/EHD) is <br /> required to obtain a high level of confidence that the site does <br /> not pose a risk to human health and safety by impacting <br /> groundwater. This determination is not a negotiable issue. <br /> PHS/EHD can not and will not offer to close a site based on, "if <br /> you do this, we will do that. " In addition, PHS/EHD must seek <br /> concurrence of its determinations from the Central Valley Regional <br /> Water Quality Control Board (CVRWQCB) before closure is possible. <br /> PHS/EHD is acutely aware of your desire for closure and will gladly <br /> accommodate you, as soon as we are able. Staff must examine a <br /> number of factors in evaluating each site. This information is <br /> then entered into a matrix called a leaching potential analysis. <br /> This matrix was developed by geologists, engineers, and engineering <br /> geologists at the State Water Resources Control Board. This matrix <br /> is the first of many forms of evaluation. In an effort to make <br /> this process more clear and add insight regarding your particular <br /> situation, the following outline is being offered. <br /> Soil type: The soil beneath this site is primarily <br /> sandy. Soils are considered the secondary source of <br /> contamination, once the leaking tanks or product lines <br /> are removed. Sandy soils have a high transmissivity, <br /> which is a measure of how fast contaminants are able to <br /> spread or leach through the ground. <br /> Depth to Groundwater: According to maps prepared by San <br /> Joaquin County Flood Control and Water Conservation <br /> District (Spring/Fall 1983 & Spring/Fall 1986) the depth <br /> to groundwater under this site has been as shallow as 15 <br /> feet. When contaminants reach the groundwater they <br /> A Division of San Joaquin Gtunn,Health Care Services C7 <br />