CORRESPONDENCE_2018-2019 - Laserfiche WebLink

Home Browse Search

Taj Bahadod Page 4of6 July 6, 2018 • Well water is clear to the unaided eye • Sediment in the well casing is less than 0.1 foot thick • Water removed during surging and purging will be a minimum of three times the water volume in the well prior to the start of purging plus three times the volume of water added for purging and surging • Temperature is consistent within 0.2 deg F • Specific conductivity is within 10 percent change • pH varies less than 0.2 pH units • Turbidity varies not more than 10% Well Installation Report - A well installation report for well WM-4A including the analytical results of first monitoring event will be included with the Second Semiannual 2018 Monitoring Report. Boring log, well completion details, and survey data will be uploaded to GeoTracker. The well installation report will include the items listed in the RWQCB's Monitoring Well Installation Report Guidelines. The report will be signed by a California -licensed professional engineer or geologist. The first monitoring event for this well will included the full suite of Constituents of Concern from Table VI of the NCSL's Monitoring and Reporting Program Number R5- 2010-0016. Re -construction of Probes SG -4, -5, -7, & -9 The RWQCB stated in the NOV that the County should provide reasoning why the last four (4) single completion gas probes (SG -4, -5, -7, & -9) have not been reconstructed as triple completion gas probes. As stated above, APTIM understands that the County acknowledges LFG migrating from the base of unlined Module I is the source of VOCs in the groundwater and the vadose zone at FSL. VOCs have been consistently detected at the following locations as shown of Figure 1: Groundwater monitoring well MW -3 Single completion probe soil gas devices SG -1, -4, -5, -7, & -9 Triple completion probe soil gas devices SG -2A, -3A, -6A, -10A, & -1 I As stated above, Figure 1 shows that the soil gas probe devices form a relative tight monitoring network around Module L The triple probe devices show that VOCs are present all the way down to groundwater at all triple probe locations. Because VOCs were detected all the way to groundwater at every location that a single shallow probe was replaced with a triple probe, it is highly likely that at the remaining single probe locations, VOCs have also migrated all the way down to groundwater. It is our understanding that 2018-07-16 FH Workplan