ARCHIVED REPORTS_XR0008195 - Laserfiche WebLink

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00 00 2 2 Permits Procurement and Utilities Clearance Following the approval of this Work Plan, San Joaquin County well installation permits will be obtained for the proposed monitoring wells Site access will be coordinated with current site operator The well locations will be marked and Underground Service Alert (USA) will be contacted to obtain clearance of underground utilities prior to the advancement of the borings 2 3 Well Installation Protocol All field procedures will be overseen by a geologist, under the direction of a California Registered Geologist Procedures for drilling soil borings, well installation, well development, and groundwater sampling are outlined in the following sections The on-site geologist will be present at all times during drilling in order to 0 Observe the drilling subcontractor, • Maintain a continuous lrthologic log of the borehole in accordance with the United Soil Classification System (USCS), • Screen drilling cuttings, and atmospheric conditions within the work place with a PID, • Oversee the implementation of the Health and Safety Plan 2.4 Soil Sampling During drilling, each borehole will be advanced using truck-mounted drilling rig equipped with an 8- inch diameter hollow stem auger Soil samples will be collected at 5-foot intervals using a California Modified Drive Sampler for lithologic identification The samples collected will be screened with a PID, however, laboratory analyses will not be performed 2 5 Monitoring Well Installation Two (2) two-inch diameter groundwater monitoring wells will be installed in borings drilled at the proposed locations shown on Figure 2 The wells will be completed to an estimated final depth of 60 feet below ground surface (bgs), based on July 1998 data that indicates a water level of 38 feet bgs, compared with reported depths to water of 52 feet in 1996 and approximately 70 feet in 1994 The groundwater monitoring wells will be installed through the hollow-stem augers Monitoring wells will be completed with flush threaded, 2-inch inner diameter schedule 40 PVC casing and well screen The wells will be assembled without the use of chemical bonding The screened interval will be filtered packed with pre-washed filter sand from the total depth to approximately two feet above the top of the screened interval Both the screen size and the filter pack will be assessed based on-site sieve inspection of the aquifer materials found at the interval to be • screened Two well screen and filter sizes will be on hand in order to prevent delays Well screens are anticipated to consist of 0 020-inch slotted schedule 40 PVC However, should the native soils DAMES&MOORE 2