WORK PLANS - Laserfiche WebLink

Home Browse Search

30 November 2000 AGI:-NC Project No. 99-061 Paine 7 of 9 Additionally. soil samples will be Field screened for the presence of'volatile orgaulic compounds using an organic vapor natter (OVM), equipped xvith a photo ionisation detector (PID). Soil sample descriptions and OVN1 readings will be recorded on a log for each boring. Following, sample collection, each preserved sample sleeve will be labeled with the horino, location. depth. time. date and samplers initials. Appropriately sealed and labeled samples will be placed in a chilled container under ice and transported under chain-of-custody procedure to a DI IS-certified laboratory. C'Uttings generated during drillim, will be placed in DOW-approved »-Mallon drums. Rinseate will he containerized in properly labeled DOT-approved 55-gallon drums. and stored on-site in an area lacking public access. Disposal alternatives will be evaluated based oil results of soil and water analysis. 4.2. WELL COMPLETION The 8.25-inch diameter pilot borings to be single-completed as a ground water monitoring wells utilising '-inch diameter schedule 40 polyvinylchloride (PVC) 0.020-inch slotted well screen and blank well casing. .A 20400t lend-th of Nrell screen is anticipated for installation of the monitoring well. A proposed monitoring well construction diagram is depicted in Figure Atter installing the well casing in each pilot boring. a filter pack material consisting ol'pre-washed 92/12 or#3 Lonestar sand will be added through the autgcl's over the screen interval to approximately two feet above the screened interval. Following placement ofthe filter pack, the well will be surged to assist in settling the filter pack. Additional sand will be added it settling" occurs. A nominal hyo-fbot bentonite sea] (pell plug non-coded bentonite pellets) will be placed above the filter pack to minimize the potential lar grout penetration into the screened section of the well. The bentonite seal will be formed by pouring bentonite pellets into the annulus and allowing them to settle on the filter pack. The hentonite pellets will be allowed to hydrate for a minimum oFone-halt hoar prior to grouting. The remaining annular space will be filled within one foot ofthe ground surface with a celllent grout. 'file grout mixture will consist ofType IIII portland neat cement and not more than 6 gallons of nater per 94-pound sack of cement. The grout vJ11 he placed by pumping through tremmic pipe. A grouting inspection will be scheduled with PHS-EHD personnel. Following completion ofthe monitoring wells, well elevations and locations will he surve\ed b% ACiI: personnel. relative to monitoring well MW-1 or a San .loaquin County elevation benchmark. Advancedfocail:ucirroriIll enlal, lug.