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1 <br /> tt <br /> �� <br /> LEARWATE r =:"" . <br /> , T Iv� .� <br /> G R O U P, I N C. ON 29 hii 9l 3h <br /> Environmental Services <br /> Ms. Lori Duncan December 23, 1998. <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> 1 <br /> Re: 'Ruiz Grocery, 4491 W. Durham Ferry Road, Tracy, CA. <br /> Dear Ms. Duncan, <br /> i - <br /> Clearwater Group, Inc. (Clearwater) is in receipt of your correspondence dated November 12, <br /> 1998, in which your office requested additional modifications or clarification regarding the soil <br /> vapor..extraction /,air,.sparge (SVE/AS) remediation system currently.operating at the referenced <br /> site. Clearwater appreciates your comments and.we'look forward to resolving these issues. On <br /> behalf:of_Mrs t-Stella,Ruiz -,t- 0 would like,to,respnd to,each of_the;issues you raised in the order <br />{ listed to help ease review <br /> (1) "There were no calibration graduations on the.dilution.airflow valve...In order to accurately <br /> quantify airflow (volume) an appropriately sized in-line flow meter shall be installed. The volume <br /> of air introduced into the destruction device of an SVE system is used to quantify the amount of <br /> pounds of hydrocarbons removed from the soil. Therefore, the added dilution airflow volume is <br /> ' important. There was no particulate filter or.moisture filter to clean the dilution air before it entered <br /> "± the s stem. Adding g particulates and moisture to the SVE system may,decrease its abi1"ity'to <br /> function efficiently." <br /> By the nature of the way.system.is configured, it is not necessary to accurately know the amount of <br /> dilution air entering the air.stream in order to calculate hydrocarbon removal rates. It is important <br /> to note that the flow at V 1 reports total airflow (i.e. well gas + dilution air), and that the SVE <br /> influent samples are also,collected at a point following the addition of dilution air (i.e. well gas + <br /> .dilution.amr). ;These,.values=are then used to,calculate hydrocarbon rates <br /> 0. <br /> i •('(..' :r' ;ris �. vd 4.:��` �ig -.. �°' .. - - 't.- - -!.. <br /> The SVE system contains::an in-line moisture knock-out to remove moisture from the air-stream. <br /> r 520'Third Street,Suite 104_ + Oakland,California 94607 + Telephone 510-893-5160 + Fax 510-893-5947 <br /> i <br />