Laserfiche WebLink
• 21 August 2003 <br />AGE -NC Project No 03-1055 <br />Page 9 of 10 <br />• <br />A nominal two -foot thick bentonite seal will be placed above the filter pack to minimize the potential <br />of grout penetration into the filter pack or screened section of the well The bentonite seal will be <br />formed by pouring bentonite chips into the annulus and allowing them to settle on the filter pack <br />Bentonite chips will be hydrated using five gallons of water The bentonite chips will be allowed to <br />hydrate for a mimmum of one-half hour prior to grouting <br />The remaining annular space will be filled to within one foot of the ground surface with a cement <br />grout The grout mixture will consist of type LT Portland neat cement and not more than 6 gallons <br />of water per 94 -pound sack of cement For inspection purposes, the EHD will be notified at least <br />48 hours prior to conducting grouting procedures A traffic -rated well box will be installed over the <br />monitoring well <br />Following completion of the monitoring well, well elevation and location will be surveyed by a <br />Cahfornia-licensed surveyor <br />3 3 3 Monitoring Well Development <br />Development of the proposed wells will consist of a combination of bailing with a stainless steel <br />bailer to remove the mayor portion of fine-grained sediment from inside the well, surging to flush <br />out or draw in sediment from the filter pack and additional ground water evacuation (purging) with <br />a Waterra bailing pump to finish the removal of fine-grained sediment Developmental purging <br />activities will be continued until field parameter (pH, electrical conductivity, and temperature) <br />readings have stabilized and purged water is visually sediment -free <br />3 4 GROUNDWATER SAMPLING PROCEDURES <br />Groundwater sample collection will be performed in accordance with pertinent applicable sampling <br />protocols, details of which are presented below <br />3 4 1 Static Water Level Measurements <br />Before sampling and during quarterly ground water monitoring, static water level and free -product <br />thickness will be measured using an electric oil/water level indicator Water level data will be <br />recorded to the nearest 0 01 foot from a reference point marked of the top of the PVC well casing <br />Before and after each use, the electric oil/water level mdicatorwill be washed in an Aiconox solution <br />and rinsed with water <br />Advanced GeoEnvironmental, Inc <br />