Laserfiche WebLink
GEOSYNTEC CONSULTANTS <br /> Ms. Amy Terrell <br /> 8 June 2001 <br /> Page 4 <br /> HRC Injection <br /> Figure 2 shows the locations of the proposed HRC injection points. The HRC <br /> injection points are distributed in 5 rows with alternating rows of 5 and 4 injection <br /> points per row. The injection points are spaced about 5 ft apart within each row and the <br /> rows are spaced about 8 ft apart. Approximately 6 lbs of HRC will be used per vertical <br /> foot of injection in the targeted uppermost groundwater treatment zone that ranges from <br /> approximately 24 to 48 ft bgs. <br /> To reduce viscosity of the HRC during injection, a hot tank will be used to heat the <br /> HRC before injection. The HRC will be pumped through Geoprobe rods using a grout <br /> pump capable of pumping at pressures ranging from 200 psi to 1500 psi. A cement <br /> grout will be used to seal the injection points from the top of the HRC to the ground <br /> surface. <br /> Groundwater Monitoring <br /> Groundwater monitoring will be performed quarterly for a period of approximately <br /> 2 years. Groundwater samples will be collected from the two new monitoring wells and <br /> MW-3 using a peristaltic pump with disposable tubing. As the project progresses, the <br /> sampling frequency may be adjusted to accommodate the rate of groundwater quality <br /> changes. <br /> The groundwater samples collected from the three wells during the pilot-scale field <br /> test will be analyzed for: <br /> • dissolved oxygen (DO); <br /> • oxidation-reduction potential (ORP); <br /> • iron; <br /> • manganese; <br /> • alkalinity including <br /> • total alkalinity, <br /> • bicarbonate alkalinity, <br /> \\WCREEK-01\DATA\PRJ I\WFS\SHELL\VER\HRC plans\RWQCB Plan.doc <br /> 40 RECMM• RECY AI LE <br />