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F <br /> STAT=OF CAUQANw GEORGE DEUKM41AN,C7pvere <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL `ALLEY REGION <br /> 3aa3 RGUnER ROAO <br /> SACRATAENTO.CA 95827-3098 <br /> Mr. Ted Knowles 17 February 1989 <br /> 1140 West Hairmer !.ane <br /> Stockton, CA -�F209 <br /> SOIL REMEDIATION PROPOSAL FOR FORMER KNOWLES GAS STATION AT 1140 WEST HAMMER <br /> LANE, STOCKTON <br /> Thank you for submitting the 6 February 1989 Soil Remediation Proposal (SRP) <br /> for our review. The in-situ venting system proposed by Groundwater <br /> Technology, Incorporated (GTI) to remediate soil at your site is acceptable o <br /> us provided that the system is shown to operate effectively during the "full - <br /> scale test. " <br /> Prior to installation, GTI is to supply us with the details on the procedure <br /> they propose to use when conducting this full-scale test of the soil venting <br /> system. The serten� • itervals of the proposed recovery wells extend across <br /> sand, silt, and c :uy layers, which means, due to its higher permeability, th <br /> sand layer will yield the mast vapors. How will the testing evaluate the <br /> systems ability to yield vapors from the silt and clay layers? Will it be <br /> necessary to install recovery wells which are screened in discrete layers or <br /> can it be shown that the system will recover vapors from all the layers? <br /> Please have GTI supply us with the testing details by 10 March 1989. <br /> All required permits for installation and operation of the system must be <br /> obtained from the appropriate local agencies. <br /> In addition, the extent of soil Contamination beneath the tank Wt is based pn <br /> data from one soil boring (S8-1) . In order to better define the vertical I i <br /> extent, and to show the initial concentrations prior to soil venting, we ' <br /> request that at least two soil samples collected from each of the four vapor <br /> recovery well installation borings be submitted to the laboratory for TPH as <br /> gasoline and BTX and E analyses. Soil samples collected from 30 feet below 9 <br /> grade down to the vertical extent of the baring are of special of interest. <br /> If petroleum hydrocarbons are detected in the soil samples collected at 45 <br /> feet below grade (the proposed vertical extent of the borings) , the boring is <br /> to be advanced until no hyd^ocarbons are detected, or until ground water is <br /> encountered. <br /> If you have any questions, )lease call me at (916) 361-5725. <br /> ray w z/ <br /> `�'' KAZ OCT 1 1 1989 <br /> EDWARD W. JAMES �T*_ lo-r/ems' <br /> 7-gi neeri ng Geologist G-e, , 4AVe ENVIR(;)NMENTAL HEALTH <br /> PERMIT/SFRVICES <br /> EWJ:ewj <br /> cc: Ms. Diane Hinson, San Joaquin Local Health District, Stockton <br /> Mr. James Grasty, Groundwater Technology, incorporated, Sacramento <br /> ;I <br />