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February 22,2012 <br /> ❑�� �1t11�8y'y0in Page 4 of 15 <br /> r_ and Associates,Inc. <br /> monitoring well will be installed to a total depth of approximately 35 feet below <br /> land surface(bls). <br /> The monitoring well will be located in the vicinity of NEG MW-1. It will be <br /> constructed of a 4-inch diameter, schedule 40 PVC outer casing to a depth of <br /> approximately 25 feet bis and a 2-inch diameter inner casing to a depth of 25 feet <br /> bls. The monitoring well will be completed with 5 feet of well screen,a sand pack <br /> and bentonite seal. The monitoring well will be finished above grade. Both the 4- <br /> inch diameter outer casing and the 2-inch diameter inner casing will extend <br /> approximately 2 to 3 feet above the land surface. The monitoring well will be <br /> completed with a 2-foot by 2-foot concrete well pad. A locking pressure cap will <br /> be used to secure the monitoring well. <br /> The monitoring well will be developed following installation. Well development <br /> facilitates the removal of sediment that accumulates within the well casing and <br /> sand pack during installation and promotes hydraulic communication with the <br /> monitoring well and the water-bearing fonnation. <br /> Ground Water Sampling— <br /> `1'he five existing monitoring wells(NEG MW-1,NEG MW-2,NEG MW-3,NEG <br /> MW-4 and NEW W 1)and one proposed monitoring well will be sampled for total <br /> and dissolved arsenic. Each monitoring well will be purged prior to sampling. <br /> Throughout the purging process,pH,specific conductivity,temperature, dissolved <br /> oxygen, oxidation/reduction potential and turbidity will be measured and <br /> recorded. Samples will be collected once the field parameters have -net the <br /> FDEP's stabilization criteria. The monitoring wells will be sampled for total and <br /> dissolved arsenic. <br /> The ground water samples will be placed on ice following collection and <br /> delivered to the Advanced Environmental Laboratories, Inc. (AEL) under chain- <br /> of-custody protocol. AEL is accredited by the NELAC(National Environmental <br /> Laboratory Accreditation Conference)Institute, it is assumed that the samples will <br /> be analyzed on a normal (7 to 10 day)turnaround time and the cost of sampling is <br /> based on this assumption. <br /> Southwest Grove <br /> The additional assessment activities associated with the South Grove includes the <br /> installation of one deep monitoring well in the vicinity of SWG ST-TW-I. <br /> Additionally, two new shallow monitoring wells will be installed to delineate the <br /> extent of arsenic in ground water north of SWG MW-5 and east of SWG MW-6. <br /> Slug test will be performed on up to three monitoring wells to estimate localized <br /> hydraulic conductivity of the surficial aquifer. Ground water samples will be <br /> collected from the eight existing monitoring wells and three proposed monitoring <br /> 45 <br />