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Work Plan and Health and Safety Plan aSK Project No. G1910411L North Manteca Trunk Sewer Test Well June 17, 2019 Manteca,California Page 3 water depth at a minimum of three and maximum of five progressive pumping rates. Storativity will be estimated from data collected after pumping is stopped, during well water level recovery to its approximate level at the start of the test. We will pump the well using a submersible stainless-steel pump having a maximum discharge rate of 40 gallons per minute.The discharge rates will be evaluated based on the real-time well yield response,with the goal of doubling the rate of discharge for each step, depending on site conditions. Each successive pumping rate increase will be made when the pumping rate step drawdown appears asymptotic. The pump test will end and well recovery measurements will begin when the final step-drawdown becomes asymptotic.The depth to water will be measured before, during and after the test using wireless transducers and a datalogger; a barometric transducer log will j also be made to understand temporal barometric effects on the water level pump test data. Water discharged from the well during the pump test will be contained at the site within a rented, 21,000-gallon tank. A water sample will be collected from the test well during the well pump test for laboratory analyses necessary to meet low-threat waste discharge permit requirements. Provided the well effluent meets the discharge requirements, the contained water will be discharged to land or surface water at a location designated by the Client at or near the well test location. If the well test effluent contained on Site can be discharged at the Site, we will be required to muck out and rinse the tank before it is removed by the tank provider. We assume this limited amount of solid and semi-solid sediment can be discharged directly to the ground surface at the Site. Task 3—Analytical Laboratory Testing As described in Task 1, we have assumed that analytical laboratory testing will be required for waste discharge permitting. We will also test the groundwater for volatile organic compounds (VOCs) related to petroleum fuel releases noted near the east end of the project area, such as the Frank's One Stop release near the intersection of West Yosemite Avenue and Airport Way.Water samples for VOC testing will be collected by bailer or from the well effluent discharge at three intervals, 1) before the well test begins, 2) during the approximate middle of the test, and 3) after pumping is discontinued. The waste discharge permit and local contaminant plume samples will be analyzed on a 5-day turn-around time (TAT),which is the minimum TAT of one of the analyses. The waste discharge permit testing, per Table I-1 of the California Regional Water Quality Control Board- Central Valley Region Order 115-2018-0002, Amending Order R5-2016-0076 & NPDES No. CAG995002, Waste Discharge Requirements for Limited Threat Discharges to Surface Water, requires the following analyses, which will be performed by BSK's State-certified analytical testing laboratory. The analyses, will be: