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0 1117 Lone Palm Avenue,Suite 201 CV �� Modesto,California 1 209-579-222-2221 Fax:209-579-2225 I1840CIATE 8 INC. remediation system. The scope of work includes: modification as appropriate of the Health and Safety Plan on file with the SJCEHD; installation of two sparge wells; conducting an ozone pilot test; and preparation of a report summarizing the results of the proposed activities. The scope of work is described below. Permitting ATC will schedule field personnel and equipment, notify Underground Services Alert to locate underground utilities as required,and perform other necessary field preparation and job start-up activities. A private utility locating service will also be used to locate underground utilities that may be present in the work areas. A drilling permit application will be completed and submitted to the SJCEHD prior to initiation of drilling activities. Sparge Well Installation Two ozone sparge wells are proposed for the pilot test. The borings for the sparge wells will be advanced using a hollow stem auger rig equipped with 8-inch outside diameter augers at the locations shown on Figure 3. These locations are in the heart of the shallow groundwater plume and will likely provide useful radius of influence data based on their proximity to existing monitoring wells JLM3 and JLM13. Soil samples will be collected at five to ten foot intervals for lithologic logging purposes. Descriptions of soil types, lithologic features, blow counts, soil-groundwater interface and sample locations will be recorded on boring logs. Soil samples will be field screened for organic vapors using a photoionization detector(PID). The pilot test well construction details for the proposed ozone sparging wells were designed using recent and historical groundwater elevation and analytical data to account for seasonal water table fluctuation. The sparge wells will be installed to a depth of approximately 35 feet bgs and will consist of 2-inch inside diameter schedule 80 PVC well screen and casing with approximately five feet of 0.010 inch slot screened PVC. An 18-inch long and one-inch diameter porous (25 micron pore size) PolyVinylidine DiFluoride (PVDF) In-situ Oxidation Point (IOP)B will be placed inside the screened portion of each sparge well. The IOP, designed and manufactured by H2O Engineering, is constructed from ozone- resistant PVDF, a highly non-reactive and pure thermoplastic fluoropolymer also known as Kynar. Within the well box, the well casing will be fitted with a water/air tight wellhead connection (WHC) designed from schedule 80 PVC material that will be used to facilitate sparging. A sand pack will be placed in the annulus of the wells extending from the bottom of the well screen to approximately two feet above the top of the screen. Approximately two feet of bentonite will be placed on top of the sand pack and hydrated with potable water. A bentonite cement slurry mixture will be tremi grouted from the top of the bentonite layer to approximately two feet below surface grade. Surface completions will consist of a watertight bolt-down wellhead set in Portland cement. Appendix B shows the proposed well construction details. Drill cuttings will be collected and stored on site in DOT- approved 55-gallon drums and will remain on-site pending proper waste profile characterization and disposal. Pilot Testing workplan—1 At L Market ATC Associates Inc- S:...\28589\ nc.5:...\28589\Reports ATC Project No.54.28589.1001 5