Laserfiche WebLink
+ <br /> ' q} 11 <br /> r 5 <br /> 30 May 2004 <br /> AGE-NC Project No 02-0962 , <br /> Page 8of10 _ <br /> r � <br /> feet above the screened interval Following placement of the filter pack, the'well will be surged to <br /> assist in settling the filter pack Additional sand will be added if settling occurs <br /> �A nominaftwo-footbentonite seal will be placed above the f lter pack to minimize the potential for°- <br /> grout penetration into the screened section of the well The bentonite seal will be formed by pouring <br /> bentonite pellets or chips into the annulus and allowing them to settle on the filter pack The <br /> bentonite pellets will be allowed to hydrate for a minimum of one-half hour prior to grouring <br /> The remaining annular space will be filled wlthin one foot of the ground surface with a cement grout <br /> The grout mixture will consist of Type UII portland neat cement and not more than 6 gallons of water <br /> per 94-pound sack of cement The grout will be placed by pumping through tremmie pipe A <br /> grouting inspection will be scheduled with EHD personnel <br /> Following completion of the monitoring wells, well elevations and locations will be surveyed by a ' <br /> California-licensed surveyor relative to a City of Stockton elevation benchmark <br /> 4 2 2 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 offine-gamed 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 /> 4 3 GROUNDWATER SAMPLING PROCEDURES <br /> Ground water sample collection will be performed in accordance with the EHD's Recommended <br /> Groundwater Sampling Gutdehnes, dated 15 February 1995 <br /> 4 3 1 Static Water Level Measurements <br /> r ,+ <br /> Before purging and sampling during ground water monitoring events, static water level will be <br /> measured using an electric water level indicator Water level data will be recorded to the nearest 0 01 <br /> foot from a reference point marked of the top of the PVC well casing Before and after each use,the ri <br /> electric oil/water level indicator will be washed in an Alconox solution and rinsed with water <br /> Advanced GcoEnvironmental,Inc <br /> + i <br /> r <br />