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t"r <br /> PUBLIC 5EALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Kaaren Furst, M.D., M.P.H., Health Officer , r <br /> 304 East Weber Avenue, Third Floor - Stockton, CA 95202 <br /> 2091468-3420 FILE G <br /> STELLA RUIZ NOV �, `� � 98 <br /> 4491 DURHAM FERRY ROAD <br /> TRACY CA 95376 <br /> RE: Ruiz Grocery SITE CODE: 1551 <br /> 4491 W. Durham Ferry Road <br /> Tracy CA 95376 <br /> On October 22, 1998, San Joaquin County Public Health Services, <br /> Environmental Health Division (PHSIEHD) made a visit to the above referenced <br /> site to meet with Henry Hurkmans of Clearwater Group, Inc. The purpose of the <br /> meeting was to get an overview of the Soil Vapor Extraction system (SVE) which <br /> has been installed on site by Clearwater Group, Inc. PHSIEHD has the following <br /> comments concerning that system. <br /> There were no calibration graduations on the dilution airflow valve. The quantity <br /> of dilution air being allowed into the system was a rough estimate at best. In <br /> order to accurately quantify airflow (volume) an appropriately sized in-line flow <br /> meter shall be installed. The volume of air introduced into the destruction device <br /> of an SVE system is used to quantify the amount in pounds of hydrocarbons <br /> removed from the soil. Therefore, the added dilution airflow volume is important. <br /> There was no particulate filter or moisture filter to clean the dilution air before it <br /> entered the system. Adding particulates and moisture to the SVE system may <br /> decrease its ability to function efficiently. <br /> There was no temperature gauge on the V1 flow sensor. Since gas volume is a <br /> function of temperature, a temperature gauge is necessary to be able to report <br /> this value in standard cubic feet/meter(scfm). <br /> Each wellhead must have: a pressure gauge, to monitor vacuum; a flow meter, <br /> to quantify air volumes; a sampling pork, to allow for specific wellhead <br /> contaminant level testing; a temperature gauge, to be able to standardize air flow <br /> rates. A control valve should be installed at each wellhead_ Radius of influence <br /> testing must be performed on each wellhead in order to determine what role <br /> each individual well is playing in the remediation effort. To do a proper radius of <br /> influence analysis you must isolate (turn off) all other wells, apply vacuum and <br /> flow to the well you are testing and then measure the induced vacuum of the <br /> other wells. If Clearwater Group, Inc. chooses to use temporary gauging to <br /> A Division of San Joaquin County Health Care Services <br />