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GROUNDWATER RESOURCES CONSULTANTS, INC .CONSULTING HYDROGEOLOGISTS

1735 EAST FORT LOWELL ROAD ,SUITE 4TUCSON, ARIZONA 85719PHONE (602) 326-1898

• ENVIRONMENTAL SPECIALIST S

August 5, 199 1

Mr . Richard CunninghamRocketdyne Divisio nRockwell International Corporation6633 Canoga AvenueDept . 543, Mail Stop JA-16Canoga Park, California 9130 3

RE : Channel Sampling Strategy

Dear Mr . Cunningham :

CHUCK M . DICKENS, P .G .

DAVID B . HAWKINS, P .G .

SHELDON D . CLARKKURT J . BLUST, P.G .DINAH H. JASENSK Y

Based upon the site reconnaissance conducted July 31, 1991, we have

further developed the soil sampling strategy for the channels leading from

the test stands (i .e . source areas) to the impoundments . Our previously

proposed approach to sampling channel soils was stratified random sampling .

The results of our field inspection, however, indicated that such an

approach would be inappropriate . The channels are diversely constructed and

should be considered separately . Some of the channels are downhill slopes

on bedrock which have been lined with concrete gunite . Other channels are

simply unlined bedrock and some are lined depressions over alluvium . The

channel lengths are also diverse . Some of the impoundments have short

feeder channels which lead to a longer channel . In addition, some channels

are located in areas of high topographic relief .

The site inspection indicates that suspected areas of contamination

will not be distributed at random nor thoroughly dispersed nor in a regular

pattern . We anticipate that maximum potential contamination will be in

areas of depressions , liner cracks , outfall drains and accumulated sediment .

We propose that the soil sampling will focus on those areas of suspected

c,9nntamination . This change from stratified random sampling is supported by

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• WATER SUPPLY DEVELOPMENT • GROUNDWATER CONTAMINATION INVESTIGATIONS •

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the California Department of Health Services draft guidance document

(Chapter 15, Standard 2 .3 .1 .1) which outlines the criteria for systematic

or random sampling . Our proposed strategy is based on known information

regarding channel physical characteristics and usage .

Each channel , including feeder channels , will be considered separately .

It is anticipated that samples will be collected using a spatula or a slide

hammer drive sampler . Channels which consist of lined gunite on bedrock

will be sampled in areas of accumulated sediment . If the bedrock channel

does not have an area of accumulated sediment , it is proposed that only the

impoundment will be sampled . It is not considered feasible to sample the

bedrock , because it is a well-cemented sandstone . Analytical procedures

would restrict detection of any volatile constituents .

If the channel is underlain by alluvium , samples will be collected in

areas of greatest suspected contamination such as depressions , cracks in the

liner ( if present ) and outfall drains . Lined channels overlying alluvium

will be cored prior to sampling . Where appropriate , four samples will be

collected from each channel . If the channel is relatively short or has

limited areas where sampling is possible , the number of samples will be

reduced . A preliminary sampling strategy is outlined below by impoundment .

• SPA-1 : Channel partially under road . One good sampling location at

north end of channel prior to underground pipe leading into

former pond .

. SPA-2 : Accessible area above former impoundment near MMH storage

area . Approximately 65 feet of lined channel is accessible .

Four sampling locations possible .

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• ABSP : Has feeder channels from Alfa 1 ( lined bedrock ), Alfa 3

(lined bedrock ) and former Alfa 2 ( lined bedrock) . The

feeder channels connect to unlined bedrock canyon which has

areas of accumulated sediment . Four sampling locations

possible within bedrock canyon portion of channel .

From the Bravo test stand are three feeder channels which

connect into one channel prior to entering ABSP . Two of the

feeder channels are concrete -lined over bedrock . At their

intersection is an area of some sediment and approximately

50 feet lower is a second area of sediment . These two areas

are considered possible sampling locations . The third

feeder channel is unlined alluvium . Based on its length two

sampling locations are proposed .

Length between the intersection of the feeder channels at

the Bravo Skim Pond ( non-RCRA ) and ABSP is approximately 100

feet . Four samples are proposed for this length of channel .

• ECL : Waste water previously entered the impoundment through

piping ( above ground pipe rack ) . No surface channel is

known to have lead to the impoundment . Sampling is proposed

only for the impoundment .

• STL-IV-1 :

At least five feeder channels are present at STL-IV-1 . The

channels are lined alluvium . At the shorter channels two

samples are proposed and for the longer four samples are

proposed .

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• STL-IV-2 :

No surface drainage channels visible . No sampling proposed,

unless channels are located .

• Delta : Channel located on steep slope and consists of lined bedrock

with no accumulated sediment . No sampling is proposed in

the channel .

• APTF : Channel is lined bedrock . Waste water could be directed to

APTF-1 or APTF- 2 . No accumulated sediment is present . No

sampling is proposed in channel .

The information presented in this letter will be included in our

sampling plan for the impoundments and channels to be submitted to the

California Department of Health Services (DHS) .

If you have any questions or comments regarding the contents of this

letter , please do not hesitate to contact us .

Respectfully submitted ,

GROUNDWATER RESOURCES CONSULTANTS, INC .

AM,0Dawn H . Gard i aProject Hydroge loggiisst

'6~4k A -Dinah H . JasenskyAssociate Hydrologist

DHG :DHJ :krb

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