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County San Joaquin CIWQS Place ID 244507 From: DelFrate, Todd@Waterboards [mailto:Todd.DelFrate@waterboards.ca.gov] Sent: Monday, January 29, 2018 4:22 PM To: Isham, Julian <Julian.lsham@aptim.com>; Hold, Howard @Waterboa rds <Howard.Hold @waterboards.ca.gov>; Bahadori, Taj <tbahadori@sigov.org>; 'Cheng, Joyce' <Joyce.Cheng@cbi.com> Cc: Easter, Daniel <daniel.easter@aptim.com>; Yurovsky, Michael <Michael.Yurovskv@aptim.com> Subject: RE: North County Landfill Well G-10 Taj, staff has reviewed the information presented below and reviewed the location map attached. San Joaquin County will advance one well boring (G-10) at the location presented on the map. Staff concurs with the location. Please proceed to install the well with the schedule provided below. Once the well has been installed and surveyed, a second letter work plan proposing two additional wells will be forwarded to staff for review. Staff will conduct a quick turn so that the County can maintain the schedule. Based on the information below, the two additional wells will be drilled starting 19 February 2018. Following completion, the wells will be surveyed. An approved Title 27 compliant well and well field requires the County to develop the wells, measure depth to groundwater, and collect initial samples. Staff expects the wells to be developed and initially sampled for COCl and five year CDCs listed in the MRP at the time of development. Please be mindful of turbidity as turbid samples may interfere with the analytes. Depth to groundwater measurements should be collected from all viable site wells on the day of measurement so that proper groundwater flow and direction can be calculated. Staff will not rescind the prohibition that no waste can be disposed of in Module 5B until the North County Sanitary Landfill has a compliant monitoring well network approved by staff. Staff must see that the wells have been properly drilled with appropriate screen intervals set at proper depths, the wells have been developed, the wells have been measured for depth to groundwater, and the wells have been sampled per the MRP. Once these conditions have been met, staff will approve the monitoring well network. This monitoring system shall be compliant no later than 30 March 2018. Following that, barring any other conditions of non-compliance with the monitoring network, the County will be able to resume filling in Module 5B. Finally, staff requests the Discharger properly respond to the Continuing NOV dated 8 January 2018 by submitting a complete Monitoring Well Installation Work Plan. A complete Work Plan is necessary to address any public or management inquiries, if needed. Please submit this Work Plan by 7 February 2018. Furthermore, by 1 June 2018, the Discharger shall submit a Monitoring Well Installation Report per the Water Board Well Installation Report Guidelines attached. Any questions do not hesitate to call. From: Isham, Julian [mailto:Julian.lsham@aptim.com] Sent: Monday, January 29, 2018 9:58 AM To: DelFrate, Todd@Waterboards <Todd. Del Frate@waterboards.ca.gov>; Hold, Howard @Waterboa rds <Howard. Hold @waterboards.ca.gov>; Taj Bahadori <tba a ori@s' olgy^org>; 'Cheng, Joyce' <Joyce.Cheng@cbi.com> Cc: Easter, Daniel <daniel.easter@aptim.com>; Yurovsky, Michael <Michael.Yurovsky@aptim.com> Subject: North County Landfill Well G-10 Todd Based our discussion today, the attached figure shows the location of the first (well G-10) of three new monitoring wells to be installed at the North County landfill. The drilling of this new well will commence Tuesday January 30, 2018. The San Joaquin County will install new G-10 at the location shown on the figure to better confirm the groundwater flow direction. As shown on the figure the current direction of flow appears to be northward towards wells G-7 and G-