ARCHIVED REPORTS XR0010698 - Laserfiche WebLink

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'} 0 �• The sparging will perform two necessary duties The first is to step the hydrocarbon from the water and soil and the second is to oxygenate the water to promote biodegradation Since all of the chemicals in gasoline have Henery's constants above 10's Atm-M3- mole" they will be stnpped from the water and soil as they have been with the vapor extraction system The added oxygen to the water will allow more oxygen for the microorganisms to metabolize the hydrocarbons in the water and soil The sparging system will have to be monitored to assure it is operating properly Pnor to starting the sparging the depth to water in wells BM-1, BM-3, BM-4, BM-5, BM-6, BM-7 and BM-8 will be measured After two days of operation the depth to water will again be checked in these wells The reason for checking is to define the limas of the sparging and to observe if the mounding from the sparging in not too great Before starting the vapor recovery from the extraction wells they will be checked for the amount of hydrocarbons in the wells and again two days later this will be checked Future testing will depend on the onginal tests If the system operates as designed the sparging will continue until it is not removing any more hydrocarbons If it is not operating as designed the system will be shut down and adjustments will be made ADDITIONAL MONITORING WELLS The EHD letter requests two additional monitoring wells Well BM-12 will be located along the western property line of this property and will check the incoming groundwater contamination from • sites west of this property Well BM-9 records incoming contamination from westerly sites but this well will define the extent of the contamination Well BM-13 will monitor contamination directly down gradient of source area (old tanks) Well BM-11 may monitor this, however there is a contaminated site to the southeast of this property and some or all of the contamination in this well may come from that site In Apn1 1996 we dnlled two hydropunch CPT bonngs in the parking lot of Pep Boys, the findings are shown in the Quarterly and Activity Report of June 10, 1996 We planned to drill three bonngs, however, the ng encountered refusal before it reach the water table This well (BM-13)will be dnlled at approximately the same spot The EHE has also requested we dnll one bonng to define the vertical limits of the contamination Through discussion, we have requested this bonng be converted to a vapor extraction well labeled VW-6 The well position and design is shown in Figures 4 and 5 Wells BM-12 and 13 will be dnlled to a depth of 60 feet, which is 10 feet below the lowest depth to water taken since January 1990 Vapor extraction well VW-6 will be dnlled to a depth of 45 feet Dunng the drilling soil sampled will be taken every 5 feet, checked with an OVA Meter and selected sampled will be sent to Sherwood Labs, a certified California Analytical laboratory, for analyses of the TPH and BTEX chemicals The bonngs will be logged geologically by a Registered Geologist The wells will be constructed using 2 inch PVC slotted casing from 60 feet to 30 feet in BM-12 &13 and from 45 feet to 15 feet in VW-6 Blank casing will placed from the end of the slotted casing to the surface Number 3 sand will be placed opposite the slotted casing and about 2 feet above the casing A bentonite seal made of hydrated chips will be placed directly above the sand and the remainder of the well annulus will be filled with hydrated cement Each well will be capped with a steel traffic box . The dnrl cuttings will be placed in steel drums and left on site until the laboratory analyses are finished F