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sl � <br /> ARZANMA <br /> Quarterly Monttonng Report,Site Code 1203 <br /> Stockton Regional Wastewater Treatment Facility <br /> 2500 W Navy Dnve,Stockton,CA <br /> August 6, 1992 <br /> Page 3 <br /> On June 24 and 25, 1992, well MW4 was redeveloped by air betting sand out of the well casing <br /> to a depth of approximately 20 feet below grade and pumping approximately 118 gallons of <br /> groundwater from the well A groundwater sample was collected after the well had been <br /> recovered Subsequent sampling rounds will allow the further development of the well <br /> GROUNDWATER MONITORING AND SAMPLING <br /> On June 24, 1992, RESNA personnel conducted groundwater monitoring and sampling from <br /> monitoring wells MW1, MW2, MW3, and MW4 Static groundwater elevations were measured <br /> prior to purging and sampling any well on-site Water levels were again measured on July 9, <br /> 1992, in conjunction with a resurvey of the wellheads Based upon July 9, 1992 monitoring <br /> data, groundwater flows northeast with a gradient of 0 008 ft/ft, or approximately 42 ft/mile <br /> (Figure 3) Groundwater monitoring data is summarized in Table 1 <br /> Groundwater samples were collected from site wells on June 24, 1992 Prior to sample <br /> collection, each well was purged of a minimum of 50 gallons of water to collect representative <br /> groundwater samples Purged water was contained in 55 gallon drums (DOT H), labelled, and <br /> stored on-site Groundwater samples were collected after physical parameters (pH, temperature, <br /> and conductivity) were monitored and had stabilized Samples were collected using a disposable <br /> bailer with a bottom-emptying device Field purge logs are presented in Attachment 1 <br /> LABORATORY ANALYSIS <br /> Groundwater samples were analyzed for BTEX and TPHD by state-certified RESNA <br /> Environmental Laboratories Analytical results are summarized in Table 2 Laboratory data <br /> sheets and chain-of-custody documentation are included in Attachment 2 <br /> Laboratory results indicate dissolved hydrocarbon constituents are not present at or above <br /> laboratory detection limits in any site wells <br /> LRO80392]PL <br />