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Cancun Restaurant - 2 - 2 May 2019 135 East Miner Street Stockton, San Joaquin County ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME), tertiary butyl alcohol (TBA), 1,2-dichloroethane (1,2-DCA), and ethylene dibromide (EDB). In an email dated 1 May 2019, AGE provided additional information regarding depth discrete grab groundwater sampling. AGE stated that grab groundwater samples would be collected at approximately 20, 60, and 100 ft bgs in borings CPT-2, CPT-3, and CPT-4, and at approximately 100 ft bgs in boring CPT-1. Central Valley Water Board staff generally concur with the scope of work presented in the Work Plan, provided the following comments are addressed. Please submit a Well Installation and Site Assessment Results Report by 30 August 2019. Central Valley Water Board staff comments follow: 1. Based on the groundwater gradient and historic grab groundwater data, the proposed location of well MW-3A is north, and cross gradient to the anticipated down-gradient flow direction from well MW-1A and the former UST pit. Therefore, please modify the location of MW-3A adjacent to existing B interval well MW-3B. In addition to being located more in line with the anticipated groundwater flow direction, this location will also allow for comparison of concentrations across depth in the same area. 2. Based on historic grab groundwater data, and data from wells MW-1A and MW-1B, A and B interval wells should be installed to the north of MW-1A and MW-1 B to define the extent of petroleum impact in this direction and to provide repeatable data points. Therefore, please install a well screened in the A interval, and another in the B interval, to define the extent of impact near soil boring B2. 3. In a letter dated 31 August 2018, Central Valley Water Board staff requested collection of additional soil gas and ambient air sampling, and submission of a results report by 31 December 2018. To date, this report has not been submitted. By 1 August 2019, submit a soil gas sampling results report. 4. In the 31 August 2018 letter, Central Valley Water Board staff requested comprehensive soil and groundwater data tables, including sample collection depth, be included in the Work Plan. While data tables were included, the sampling depth of grab groundwater samples from borings B1 through B5 was not included. Please update comprehensive data tables to include sample depth for all soil and grab groundwater samples. Comprehensive data tables should be included in the results report due 30 August 2019. 5. In the 31 August 2018 letter, Central Valley Water Board staff requested submission of a Revised Sensitive Receptor Survey, provided DWR well completion reports are now available. To date a Revised Sensitive Receptor Survey has not been submitted. By 30 June 2019, please submit either a Revised Sensitive Receptor Survey, or an update on receiving well completion reports from the Department of Water Resources with a proposed submission date for the Revised Sensitive Receptor Survey. 6. In the 31 August 2018 letter, Central Valley Water Board staff requested submission of the following documents to the State Water Resources Control Board's Geotracker website: