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James T. Allen, Ph.D <br /> Page 4 <br /> July 31 , 1987 <br /> - Three rounds of sampling have not indicated <br /> the presence of any organic contaminants. <br /> The planned well DSW-2E will be situated down- <br /> gradient of the source area, between the site <br /> and potential drinking water supply wells, <br /> and will be monitored quarterly. <br /> o Wells DWS-2A and DWS-2B do not need to be monitored <br /> quarterly because: <br /> Previous sampling has not revealed the pres- <br /> ence of organic contaminants in these wells . <br /> Existing and planned Wells DWS-1B, DWS-7A, <br /> and DWS-7B are downgradient of the source <br /> area and will be monitored quarterly; these <br /> locations will provide better information <br /> than would DWS-2A or 2B. <br /> - The groundwater tapped by these wells contains <br /> very high TDS (average greater than 1 ,500 mg/1) <br /> and chloride (average greater than 600 mg/1) <br /> and is therefore not a potential source of <br /> drinking water. <br /> o Wells at Gold Bond and the City_ Police well do not <br /> need to be monitored quarterly because : <br /> The Gold Bond wells produce nonpotable water <br /> (high TDS and chloride) and are used solely <br /> for industrial process water. <br /> Several rounds of sampling have not indicated <br /> the presence of organic contaminants in the <br /> currently operating wells . <br /> The SCPD well is not at present operated as a <br /> source of drinking water supply, although it <br /> exists as a potential emergency water supply <br /> source; this well will be sampled for General <br /> Scan Analysis . <br /> The preliminary PHERA will address the need <br /> for additional monitoring to protect public <br /> health. <br />