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04 August 2000= AGE-NC Project No 9.8-0521 _ = Page 6 of 11 3 2 2 Logging _ J --Duplicate soil samples were extruded from the remaining brass sleeves or from the unpreserved =_ portions of the soil in the coi e barrel sample and were screened for the presence of organic vapor, ' - using the OVA-The-OVA readings were iecorded on the boring logs Soil samples were visually - - described and logged in accoi dance with the Unified Soil Classification System(USCS) The boring - logs ai e pi esented in Appendix A _ ' LL 3 2 3 Monitoi ing Well Installation and Development Following drilling and sampling of soil borings MW-1 through MW-3, the soil borings were ' - - completed as ground water monitoring wells Wells MW-1 and MW-3 were constructed using two 2-inch diameter, schedule 40PVCcasing while well MW-2 was constructed with 4-inch diameter, schedule 40 PVC casing The monitoring wells wei e designed with 0 02-inch slotted screen installed ' fi orn depths of app`i oximately 5 to 20-feet bsg and with blank casing extending to the surface A filter pack of#2112 Lonestai sand was installed from 4 to 20 feet bsg Bentonite chips were used to create a one-foot transition seal above the sand pack The remaining annular space was backfilled to within t • six inches of surface grade with portland cement A traffic-rated well box (8-inch diameter) was installed over each well, in accordance with San Joaquin County regulations Monitoring well design specifications-al e depicted on the boring logs in Appendix A - On-30 Api iI 2000, the wells were developed in order to increase water flow into the well and to _ min_imize the amount of fine-grained sediment di awn into the well during pumping or bailing 3 2 4 Ground Water Monitoring Activities On 07-June 2000, ground water monitoring activities were pei formed at the site The monitoring ' activities included the measurement of gi ound water levels and collection of ground water samples - fiom the three monitoring_wells- ' - The watei level in each monitoring well was measured i elative to the tops of the well casings using a Solmst water level meter_After water levels were measured, a two-stage submeF sible pump was used to purge each well Ten gallons(a minimum of three well volumes)of water were removed from ' wells MW-1 and MW-3 and twenty-seven gallons of water were removed from well MW-2 - Temperatui e, pH and conductivity of the purged water were measured at two-gallon intervals for ' - MW-1 and MW-3 and nine-gallon intervals foi MW-2 Temperatui e, pH and conductivity of the pui ged watei was measui ed using an ICM water analyzer(Appendix B) Purged water was stored -_' -- - - Advanced GeoEnvn•anmental,Inc