December 3, Work Plan, ECL Pond Soil Investigatio n Santa Susana Field Laboratory Rockwell International Corporation,

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1 HDMSe December 3, 1984 Work Plan, ECL Pond Soil Investigatio n Santa Susana Field Laboratory Rockwell International Corporation, Rocketdyne Division

2 HDMSe I WORK PLA N ECL POND SOIL INVESTIGATIO N SANTA SUSANA FIELD LABORATOR Y ROCKWELL INTERNATIONAL CORPORATIO N ROCKETDYNE DIVISIO N INTRODUCTIO N This work plan has been prepared pursuant to a request from Mr. Michael Francis, Environmental Control Specialist, Rocketdyn e Division, Rockwell International Corporation. The purpose o f this work plan is to assess the extent of suspected soi l contamination in the vicinity of the Engineering Chemistr y Laboratory (ECL) Pond at the Santa Susana Field Laboratory (SSFL). This work plan has been prepared as an addendum to th e existing ECL Pond groundwater investigation work plan. The task s outlined under this work plan should be performed in conjunctio n with the ECL Pond groundwater investigation in order to cost. The objectives of the work plan are as follows : minimiz e organic compound s vertical extent of suspecte d In October 19234, was excavated down to the top of the Chatsworth Formation. After the excavation was completed, water was observed seeping into the excavated pit. Water samples were collected and analyzed by the Rocketdyne Analytical Chemistry Unit. Results of analyses

3 HDMSe indicated the presence o f tetrachloride, chloroform, an d Associates, Inc., 1984). It i s in the immediate vicinity o f sources of contamination to th e data developed during the implementation of this work plan may b e in designing a program ECL Pond area thus contamination. to excavate contaminated soils fro m eliminating the source of groundwate r

4 HDMSe SOIL CONDITION S The ECL Pond was constructed in Quaternary alluvium. Th e Quaternary alluvium is composed of unconsolidated gravel, sand, silt, and clay. This mixtures of material has been eroded fro m surrounding exposures of the Chatsworth Formation, and has bee n deposited on the irregular erosional surface ofthe Chatswort h Formation. In the vicinity of the ECL Pond the eroded Chatswort h Formation surface is characterized by northeast-southwes t trending ridges which may be broken by eroded joints trendin g northwest-southeast. The thickness of the alluvium varies, bu t is probably less than 20 feet in most places. During excavatio n of the ECL Pond in October 1984, the alluvium-chatswort h Formation contact was encountered approximately five feet belo w the bottom of the pond. The Quaternary alluvium overlies the Cretaceous Chatswort h Formation. The Chatsworth Formation is composed primarily o f massively bedded, well-consolidated, marine sandstone with thi n interbeds of shale and minor lenses of conglomerate. Th e to the northwest and, where exposed, i t

5 HDMSe002321'53 PROPOSED SOIL INVESTIGATIO N I For the purposes of this investigation samples should b e collected through the entire sequence of alluvium overlying th e Chatsworth Formation. The maximum thickness of the alluvium i s unknown, but is believed to be less than 20 feet Soil Boring s A total of 6 soil borings are proposed ( Figure 1). Four borings will be located alon g the margins of the pond excavation. Four additional borings will be located at a distance of 10 feet from the excavation. Sample Collection Procedure s Soil sampleswill be collected using split -spoon or Shelby tube samplers. All sampling devices will be cleaned thoroughly before each sample is collected. After each split- spoon or Shelby tube is removed from the borehole, the hole will be advanced using a bucket auger and additional split - spoons Shelby tubes will be driven. Sam$les will be collected at one foot intervals from land surface to the base of the alluvium. Lithologic logs for each soil boring will be compiled. or Samples collected using brass Shelby-type tubes will be sealed, unextruded, with teflon caps or aluminum foil. Samples collected using other devices will be placed in clean glass jars with teflon-lined lids. All samples will be labeled and refrigerated immediately after collection. Containers used to refrigerate the samples will protect the samples from light. Analyses will be performed by Brown and Caldwell Analytical Services Division, Pasadena, California. Standard chain-ofcustody and sample integrity procedures will be followed (Hargis

6 HDMSe Harois & Associates, Inc. & Associates, Inc., 1984 ; Appendi x Analytical Procedure s Analyses will be performed on all samples collected from the depth interval 0-1 feet, and on all samples collected from the depth interval immediately above the base of the alluvium. Analyses will also be performed on samples collected at approximately half the total depth of the borehole. Additional analyses from other depth intervals may be required. Samples not analyzed immediately will be stored and refrigerated for possible later analysis. Samples will be analysed for volatile organic compounds using EPA method Samples will also be analysed for total nitrate, sulfate, and flouride content.

7 HDMSe Hargis & Associates, Inc., Work Plan : ECL Pond Groundwate r Investigation, Santa Susana Field Laboratory, Rockwel l International Corporation, Rocketdyne Division.

HDMSe00232156................ ENGINEERING CHEMISTRY LABORATORY CONCRETE CHANNE L L ' ECL POND SH-2.,r!SH- 3 < ~ CONCRETE LINED ASH-5 SUSPECT WATER POND S/LVERNAL0?

8 HDMSe ENGINEERING CHEMISTRY LABORATORY CONCRETE CHANNE L L ' ECL POND SH-2.,r!SH- 3 < ~ CONCRETE LINED ASH-5 SUSPECT WATER POND S/LVERNAL0?ESERVOI R, Rocuera ;, EXPLANATIO N SH-I j-...frop ROCKWELL --,! COR-ORATiO N Sunk, rn, I,I, I-1 '.:: rulur i ECL AREA Hargis Ls associate' 1 l1s~ 11 1\ J'11 LPIll, Inc

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