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Quarterly Monitoring Report <br /> April through lune 1993 <br /> r rr; 1 <br /> Smith's Canal Pump Plant <br /> Page 2 <br /> removed from MW4. Table 2 summarizes the product thickness measurements and volume of <br /> product removed. All bailed product has been contained in a DOT approved double containment <br /> drum pending appropriate disposal. <br /> Groundwater samples were collected on June 9, 1993, from wells MW2 and MW3. No <br /> groundwater sample was collected from MW4, due to the presence of product sheen. San <br /> Joaquin County Public Health Services, Environmental Health Division (PHSIEHD) has granted <br /> semi-annual groundwater sampling for MWl, therefore, no sample was taken from this well. <br /> The next groundwater sampling for MW 1 is tentatively scheduled for October 1993. Prior to <br /> sample collection, each sampled well was purged of a minimum of three well volumes of water <br /> to collect representative groundwater samples. Purged water was contained in labeled 55 gallon <br /> drums (DOT H), and stored on-site. <br /> Groundwater samples were collected after physical parameters (pH, temperature, and <br /> conductivity) were monitored and had stabilized. A dedicated disposable bailer with a bottom- <br /> emptying device was used to collect samples from wells MW2 and MW3. Field purge logs are <br /> presented in Attachment 1. <br /> LABORATORY ANALYSIS <br /> Samples were analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX) and total petroleum <br /> hydrocarbons as diesel(TPHD)by Sequoia Analytical, a State-certified laboratory, utilizing EPA <br /> methods 8020 and modified 8015, respectively. Analytical results are summarized in Table 3. <br /> Laboratory data sheets and chain-of-custody documentation are included in Attachment 2. <br /> Laboratory results indicate dissolved hydrocarbon constituents in the diesel range are present in <br /> well MW3 at 55 parts per billion (ppb), which is marginally above the detection limit of 50 ppb. <br /> Monitoring well MW2 laboratory results indicate dissolved hydrocarbon constituents are not <br /> present at or above detection limits. <br /> ANTICIPATED ACTIVITIES <br /> RESNA anticipates that the additional field activities proposed in RESNA's April b, 1993 <br /> workplan will begin in late July. Field work will include the installation of two additional <br /> monitoring wells and drilling seven soil borings to further define the extent of groundwater and <br /> QRTpRLY`2QMR1993.PNL <br />