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r. DCT E_ _= 1r:_- LE",/IPI�F,'I:_1<:E, 4 „ L,EVINE•FRICKE CONSULTING ENGINEERS ANO HYDROOEOLOO18TS LF 134'7 October 28, 1988 Mr. Kevin Huber Grupe Development Company 2291 West March Lane, Suite 100B Stockton, California 95207 Subject: Revised sampling and Analysis Plan for Preliminary Field Investigation Brookside Development site, Stockton, California Dear Kevin: Enclosed is our revised sampling and analysis plan (Tasks 5 and 6 from our work Order Number 1, dated October 11, 1988) for con- ducting a preliminary field investigation of the subject prop- erty. The purpose of this investigation is to assess the poten- tial presence of environmental contaminants associated with cur- rent and past activities at the site. The changes made to the original sampling and analysis plan were based upon information obtained during our assessment of background information concern- ing the subject property, and our field inspection, historical review, and regulatory record review on the property conducted to date (Tasks 1-3 of Work order Number 1) . our overall strategy for investigating the subject property is essentially the same as that proposed in the Work order, We pro- pose to conduct two types of sampling: soil sampling at randomly-- selected locations within the field areas of the subject prop- erty, and targeted sampling of both soil and ground water at spe- cific locations where site activities appear to indicate a higher likelihood of release of chemicals to the subsurface. For the first type of sampling, we propose to divide the subject property into eight units, based roughly on crop history and parcel bound- aries. Soil samples: will be collected from shallow borings at four to five locations within each unit, and samples from each unit will be composited by depth into one sample for laboratory analysis. At the targeted locations, soil and/or ground-water samples will be collected at selected locations. These samples will not be composited, but will be analyzed discretely for the suspected types of compounds. We propose to collect soil samples at 10 targeted locations, and water rumples at 12 targeted locations on the subject property. in addition, two surface water and twc near-surface sediment samples will be collected for analysis, one of each from each of two drainage ditches that transact the sub- ject property. 1400 Power street, 12th Floor Emeryville, COYOMIO 94608 (415) 652-4500 Other off,ces in NEWPORT BEACH and OAKLAND, CA