ARCHIVED REPORTS XR0001633 - Laserfiche WebLink

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r A k4KLEINFELDER File No 20-3769-01 November 21, 1994 At this time and in accordance with previous SJCEHD requests on this project,fwe propose ton analyze only the bottom three soil samples from each-boring After collection, the soil samples 4 'will be-labeled, logged on a chain-of-custody, and immediately stored in an iced cooler The samples will be submitted ta-APPL�Inc in Fresno, California for the following analyses PP • TPH Purgeable by EPA Method 8015NV5030 (gasoline range) • BTEX by EPA Method 8020 The samples will be analyzed on a normal laboratory schedule requiring approximately two weeks (ten working days) for completion In an attempt to fully define the extent of hydrocarbon-affected groundwater with a limited number of wells, Kleinfelder recommends the use of a Hydropunch 11 The Hydropunch IIe (HP11) is a discrete groundwater grab sampler The water sample is obtained by drilling down to the capillary fringe Once the capillary fringe is encountered the auger bottom plug is lifted out, the Hydropunch II® is lowered to the bottom of the auger The Hydropunch 110 is then driven approximately 3 to 5 feet into the aquifer The Hydropunch Ile casing is then lifted, exposing 3 to 5 feet of Hydropunch IIS screen A bailer can then be lowered into the Hydropunch 110 and abtam water which has entered it through the screen by hydrostatic pressure The use of the U�`k11� Hydropunch II® is advantageous because it allows further plume definition of hydrocarbons within an aquifer (with defined groundwater flow direction and gradient) so that a limited number of wells can be utilized By lirruting the number of wells used, long-term monitoring costs are significantly reduced The Hydropunch 11® would be used in 1 of the 2 borings proposed for this site Once the plume has been further defined by use of the Hydropunch He, the one 55-foot deep boring would be advanced at a location based on the data obtained and a morutoring well would be installed in it The boring will be drilled approximately 20 feet into groundwater (approximately 55 feet bsg) All soil borings will be advanced using a truck-mounted drill ng equipped with 8-inch hollow stem augers The borings will be drilled, logged, and sampled following the protocol described in Attachment A Following completion of the drilling, a 2- inch diameter Schedule 40 PVC well will be installed in the monitoring well boring__The well .� will be constructed as described in Attachment A -Ali of the wells will be surveyed for_well' location and elevation above mean sea level (msl) by an independent subcontractors so that subsequent water-level-sounding data can be utilized in determining groundwater flow directions and gradient, as described in Attachment A The costs for this task as reflected in Attachment B, are the same unit costs as expressed in the awarded contract However, the attached costs reflect the additional chemical analyses required by Mr Michael Collins of the SJCEHD during the prior phase of work ETH and 1WC194 Copyright 1994 Klefnfelder Inc Page 4 of l l