ARCHIVED REPORTS XR0012678 - Laserfiche WebLink

Home Browse Search

tion. The second well will be constructed with d" PVC well casing and screen to allow for the pumping tests and use as a Possible reinjection well during remediation, if necessary. Should it be determined that groundwater contamination extends beyond the property lines of the project site, additional moni- toring wells may be proposed in a future work plan. One of the soil borings will be drilled to 30 feet at a location on the edges e: of Channel Street, under permit from the City of Stockton, to determine the lateral extent of the soil hydrocarbons detected in MW2. The second soil boring (an angle boring) will be drilled to 15 feet, under the easterly pump island to determine if any hydrocarbons are present in soils beneath the island. The three 35 foot vapor extraction wells will be situated so that they can be used in future remediation activities if the vapor extraction test results warrant. 3.1 Drilling/Well Development/Mcaitoring The two groundwater monitoring wells will be drilled to depths of 45 foot below grade, approximately fifteen below the estimated static water level (Figure 2). The wells will be constructed of two and four inch diameter F480 PVC well screen/casing and com- pleted as shown on Figure 4. Each well will be developed in accordance with WaterWork's Well Development Protocol (Appendix I) prior to setting the surface seals. A neat cement mixture w ' will be used to seal the wells. -• One soil boring will be drilled to a depth of 30 foot below grade at the location shown on Figure 2. Two soil samples will be collected during the drilling of this boring. A 15 foot angle soil boring will bedrilled at the location shown on Figure 2 to assess the soils beneath the easterly pump island. One soil sample will be collected during drilling. Three vapor extraction wells will be drilled to 35 foot below grade (Figure 2). These wells will be screened above the water table for use in the vapor extraction test and for possible remediation activities. Drilling will be conducted by State licensed (C57) drilling company using a hollow stem drill rig. A field geologist will be present to continuously log all drill cuttings and soil samples utilizing the Unified Soil Classification System. Descriptions Of soil types encountered, sample collection intervals, boring abandonment, and well construction detailswill be recorded on well/boring logs and included within the assessment report. �- Cored soil samples will be collected above the water table at --in five footintprvals_and-belowthe-water--table-at- select-Inti�rvals - -- ''--— -- T in-accordance with WaterWork's Soil Sampling Protocol (Appendix y II) . Selected soil samples will be submitted for laboratory analysis. Selection of samples for laboratory analysis will be 4 .<