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1 <br /> B2. Soil Sampling Handling and Transport <br />' P g g <br /> 1 The soil samples were submitted to an on-SITE mobile laboratory provided by Baseline <br />' On-Site Analysis of Huntington Beach, California for analyses <br /> 2 Sample handling, transport, and delivery to the laboratory were documented using <br />' proper chain-of-custody procedures, including the use of chain-of-custody forms <br /> B3. Groundwater Monitoring Well Installation Procedures <br /> 1 The monitoring well installation permits were obtained from the San Joaquin County <br /> Public Health Services prior to well installation <br />' 2 The morutoring wells were constructed of flush-jointed,threaded, 4-inch inside diameter <br /> (ID), Schedule 40 PVC slotted (0 020-inch) and blank casing The screened intervals <br />' were completed from approximately 20 to 60 feet bgs and 35 to 60 feet bgs The filter <br /> pack consisted of No 3 sand placed from the bottom of the screened interval to 3 feet <br /> above the top of the screened interval. <br />' 3 An approximate 3-foot thick granular bentonite annular seal consisting of hydrated <br /> medium bentonite chips was placed immediately above the sand pack and was then <br /> backfilled to l foot bgs with type I-II cement <br /> 4 A traffic-rated well housing was placed above the well casing and set in concrete The <br />' well housing, which had a locking lid, was set flush with the ground surface <br /> 5 Well development was not implemented until at least 48 hours after the well had been <br /> installed The wells were developed by surging with a surge block, and bailing using the <br /> Smeal rig to remove a minimum of five (5) casing volumes of water during well <br />' 6 The water-depth measuring point on each well's casing was noted with a small mark in <br /> the casing The elevation of the top of the casing at the notch was surveyed to the nearest <br /> 0 01 foot relative to mean sea level (msl) by Morrow Surveying, of Sacramento, <br />' California, a licensed surveyor The locations of the wells were surveyed to second- <br /> order accuracy <br />' 134. Water-Sample-Collection Procedures <br /> 1 The water level and depth to the bottom of each well were measured using an <br />' hydrocarbon/water interface meter, the measurements were recorded to the nearest 0 01 <br /> foot Prior to use in each well, the meter was decontaminated <br />' 2 Prior to the collection of groundwater samples, the well was purged until at least three (3) <br /> iwell casing volumes of water had been removed and stabilization of pH,temperature, <br /> electrical conductivity and turbidity readings had been reached <br />