Laserfiche WebLink
0 <br /> • 25 August 1997 <br /> AGE-NC Project No 95-0173 <br /> Page 6 of 6 <br /> 2 The PVC casing will be emplaced through the hollow stem augers, utilizing 3-feet of screen <br /> from 37 to 40-feet bsg <br /> 3 A #3 Lonestar Lapis Luster sand will be poured down the annulus between the well casing <br /> and the Inner wall of the hollow stem auger The filter pack will be placed adjacent to the <br /> screen(0 020 Inch screen size) from the bottom of the boring to a point approximately 2 feet <br /> above the top of the screen <br /> 4 A five foot interval of bentonite will be placed above the filter pack and will serve as an <br /> annular seal Portland Type II cement will be utilized to grout from the annular seal to surface <br /> grade The proposed IAS well construction diagram is Included as Figures 3 -Pi oposed In- <br /> ,situ Air Spai ging Well Design <br /> 4 3 IN-SITU AIR SPARGING PILOT TEST <br /> The following procedures will be followed for performance of an IAS pilot test <br /> • 1 A compressor-driven unit will be used to inject air into the subsurface via the IAS well <br /> 2 Parameters to be measured during the IAS pilot test include induced pressure at monitoring <br /> points, sparging rate (discharge rate), vapor concentrations at monitoring points, depth to <br /> ground water in ground water monitoring wells and dissolved oxygen <br /> 3 Ground water samples will be collected from selected wells prior to Initiation of the pilot <br /> study and at the completion of the pilot study Ground water samples will be collected using <br /> disposable bailers and new nylon rope, samples will be collected In 40-m1 VOA vials and one- <br /> Iiter amber bottles <br /> 4 Store the ground water samples In a chilled container and transport under chain-of-custody <br /> protocol to a state-certified laboratory for analysis of TPH-g, TPH-d, BTEX, MTBE and iron <br /> in accordance with approved EPA methods <br /> 44 REPORT PREPARATION <br /> Upon completion of the pilot test, sampling and laboratory analysis, a Corrective Action Report will <br /> be prepared summarizing results of the work performed The report will include recommendations <br /> for additional investigation or remediation, if necessary The report will be in a format acceptable to <br /> the PHS-EHD and CVRWQCB and will be reviewed and signed by a California Registered Geologist <br /> • <br /> A6 anced GeoEm lroju1 cnu 1,Inc <br />