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12 <br /> <br />3. the treatment area in flowing waters or immediately outside of the treatment area in non - <br />flowing waters, immediately after the application event, but after sufficient time has elapsed <br />such that treated water would have exited the treatment area. (pre-treatment) For Redwood <br />Shores Lagoon, the event monitoring will occur in the untreated portion of the lake <br />within 10 minutes after the pesticide application along a given boundary and at a <br />distance of 50-70 feet from that boundary. Shoreline landmarks or buoys, and GPS <br />coordinates will mark the site for the follow up post-treatment sampling. <br /> <br />4. Post-Event Monitoring. Post-event monitoring samples shall be collected within the <br />treatment area within one week after application. (post-treatment) For Redwood Shores, the <br />post-treatment sampling will typically occur 4-7 calendar days following the application <br />event, and may occur immediately prior to the following week's application even if it's within <br />the 7 calendar day period. <br /> <br />This sampling program results in two (2) locations being sampled the day of the treatment, <br />and the same two (2) locations sampled 4-7 days later. The location of each sampling site will <br />be recorded as both a brief written description and as longitude and latitude using a GPS unit. <br /> <br />4.4 SAMPLING METHODS AND ANALYSES <br /> <br />Two general types of water analyses are conducted to determine water quality conditions and <br />potential toxicity. The first type is a "general characterization of water quality conditions" <br />and consists of mostly field analyses for: dissolved oxygen, temperature, pH, turbidity, and <br />salinity. The second type is the "pesticide residue analysis" and consists of the laboratory analysis <br />for the active ingredient (the toxic component) in the pesticide used in the treatment (Table 2). <br />A third category of monitoring included in Table 2 is that of nutrients. Although not required <br />for an APAP, monitoring nutrient levels during the pesticide monitoring activities will aid in <br />evaluating the effectiveness of BMPs instituted to reduce the frequency of algal blooms. <br />4.4.1 Field Measurements <br />If measurements of dissolved oxygen, temperature, pH, turbidity, and salinity may be <br />conducted in the field with instruments. If testing of these parameters is conducted in the field, <br />calibration of the test instruments shall occur that morning prior to their use. Water samples <br />for testing shall be taken from the mid-depth of the water column using a discrete-depth sampling <br />bottle such as a Kemmerer bottle. The Kemmerer bottle or equivalent shall be rinsed three <br />times in the water to be sampled prior to collecting the water samples from that site. The <br />coordinates of each sampling location will be determined and recorded using a GPS unit. <br />4.4.2 Sampling for Laboratory Analysis <br />Water to be sampled for pesticide residue analyses will be collected from the mid-depth of the <br />water column using a discrete-depth sampling bottle such as a Kemmerer bottle. The Kemmerer <br />bottle or equivalent shall be rinsed three times in the water to be sampled prior to collecting the <br />water samples from that site (see the QA/QC section for other measures to avoid sample <br />contamination). Copper samples will be filtered on site, or shall be placed in plastic bottles <br />6.3.A. - Page 176