ARCHIVED REPORTS XR0001638 - Laserfiche WebLink

Home Browse Search

-w•5 1 20 September 2001 AGE-NC Project No 96-0235 V ' Page 6 of 8 1 5 DOT-approved 55-gallon drums, and stored on-site in an area lacking public access Disposal alternatives will be evaluated at a later date=based on laboratory results of rinseate _ A second soil boring will be located adjacent the first CPT boring for ground water sample collection Based on CPT findings, discrete grab groundwater samples will be collected in saturated intervals of porous and permeable material beginning at a depth of approximately 40 feet bsg A y ' HydroPunch sample tool will be pushed into the specified zone, then withdrawn approximately five feet to expose an inlet screen The Interior of the sampling tool fills with water and a 1-inch outer diameter (O D) stainless steel bailer will be lowered and,utilized to extract a ground water sample All soil borings will be'backfilled over their entire depth with a portland cement grout mix Following,sample collection, the sannples will be placed in laboratory- Pp su lied containers, be ' labeled, and will be transported under chain-of-custody to a DHS-certified laboratory Proposed CPT boring locations are Illustrated on Figure 2 Following borehole advancement, portland cement (grout mix) will be utilized to backfill each borehole utilizing a tremae pipe The PHS-EHD will be given the opportunity to inspect the grout mix prior to,backfilling activities 1 3 2 GROUND NATER EXTRACTION WELL PILOT BORING AND COMPLETION The pilot soil boring will be advanced to a depth of approximately 50 feet bsg utilizing a truck— mounted, hollow-stem dnll rig equipped with 12-Inch diameter hollow-stem augers Cuttings generated during drilling will be placed on plastic sheeting and covered Rinseate will be 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 on results of soil and water analysis ` The pilot soil boring will be completed as a ground water extraction well utilizing a six-inch diameter Schedule 40 PVC'0 020-mch slotted,well screen and casing A 20-fo6t section of well screen will,be installed from a_depth_of approximately 30 feet to 50 feet bsg with blank casing , y extending to surface grade i After installing the well casing, filter pack material consisting of pre-washed #3 Lonestar sand will be added from the bottom of the borehole to approximately two feet above the screened interval as the augers are slowly pulled upward Following placement of the filter pack, the well will be surged to assist settling the filter pack,, Additional sand will be added if settling occurs AGE's extensive experience,installing extraction wells in San Joaquin County has shown those materials generally ' result mwells that can be surged,' developed and that produce ground water with minniial sediment A nominal five-foot'bentonite seal will be placed above the filter pack Bentonite chips will be 1� ` Advanced GevEnvironmentai,Inc