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' 7 CLEARW_ "A�K' TER G R O L, P I N C Ennrronmerstnf Scro,ces DRILLING AND WELL INSTALLATION ACTIVITIES Date of field activities 4/22/97 Wells Installed VW-4 Drilling Company Mitchell Drilling Environmental, Inc of Rancho Cordova, CA Drill Rig Type CME-75 equipped with 10-inch diameter hollow-stem augers Well Materials 4-mch diameter PVC with 0 02-inch slotted screen Casing Blank/Screen 0-5 feet bgs / 5-15 feet bgs Grout/Bentonite/Sand 0-2 feet bgs / 2-4 feet bgs /4-15 feet bgs Sand Type Lonestar#3 Sand Remarks Soil types observed during drilling correlated well with strata observed wells MW-1 and VW-3 See attached boring log and well construction details PROJECT STATUS Clearwater has completed the Construction Specifications Package for the installation of the groundwater air sparge and soil vapor extraction system proposed in the Revised Remedial Action PIan, letter dated November 12, 1996 The specifications package will be used to solicit bids from contractors within the next month Following receipt of construction bids, Clearwater will subnut a pre- approval request to the Underground Storage Tank Clean-up Fund for costs associated with installation, start-up, operation and maintenance of the remediation system Clearwater has also completed and submitted an authority-to-construct permit application to the San Joaquin Valley • Urufied Air Pollution Control District for the construction of the soil vapor extraction system ATTACHMENTS • Site Location Map (Figure 1) • Site Plan (Figure 2) o Groundwater Elevation Contour Map-4/22/97(Figure 3) • Hydrocarbon Distribution Map-4/22/97(Figure 4) o Groundwater Elevations and Sample Analytical Results (Table 1) • Clearwater Gauge/Purge Calculations and Well Purging Data field sheets o Soil Boring and Well Construction Log VW-4 n Laboratory Report and Chain-of-Custody Form o Clearwater Field Procedures Ruiz,4491 W Durham Ferry,Tracy,CA 2 May 26, 1997