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5.5 Monitoring Well Development <br /> The monitoring wells will be developed no sooner than 48 hours following installation. The wells <br /> will be developed by block-surging and over-pumping a minimum of five water-filled casing <br /> volumes. During development, purge water will be periodically monitored for turbidity, pH, <br /> electrical conductivity, and/or temperature. Development will cease once relatively clear <br /> groundwater is produced and/or until groundwater parameters have stabilized over two to three <br /> consecutive readings. <br /> 5.6 Surveying of Monitoring Wells and Establishing Groundwater Gradient <br /> A wellhead elevation survey will be performed to provide surveyed measuring-point elevations <br /> used to establish the elevation of groundwater in the monitoring wells. The survey will be <br /> performed by a California Licensed Land Surveyor in accordance with the State of California <br /> Geotracker requirements. Depths-to-water will be logged and corresponding groundwater <br /> elevation will be calculated when the monitoring wells are sampled. Utilizing the calculated <br /> groundwater elevations, a groundwater elevation contour map will be prepared and the <br /> groundwater gradient will be calculated. <br /> 5.7 Groundwater Sampling Methodology and Analyses <br /> Groundwater samples will be collected from monitoring wells MW-1, MW-2 and MW-3 following <br /> well development.The monitoring wells will additionally be sampled approximately three months <br /> following the initial sampling event. <br /> Prior to collecting groundwater samples, the water levels in the wells will be measured and the <br /> wells will be purged using a reduced-flow technique and groundwater samples collected once the <br /> groundwater purge parameters have stabilized. A minimum of one tubing and pump volume will <br /> be removed from each well before a sample is collected. <br /> Groundwater samples will be contained in 40-ml laboratory-grade volatile organic analysis (VOA) <br /> vials preserved with hydrochloric acid (HCL). Groundwater samples collected from the monitoring <br /> wells will be submitted for analysis of VOCs,fuel oxygenates in accordance with EPA Method 82606, <br /> and for TPH-cc in accordance with EPA Method 8015M. <br /> Additional Site Assessment Work Plan <br /> Heliostockton Property <br /> 434 Dr.Martin Luther King Jr. Boulevard <br /> Stockton,California <br /> Partner Project Number SM17-191672 <br /> RWQCB Case#:392004 <br /> January 9,2018 <br /> Page 12 <br />