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� r , a r r 12 January 2004 °i AGE-NC,Project No 95-0121 ' Page 6 of 6 Additionally, the vertical extent of hydrocarbon-impacted soil and ground water Ihad not been fully ' assessed when the CAP was developed The mass of adsorbed hydrocarbons now known to be within 1 the saturated zone is significant,mostly due to the elevated ground water table At the time the CAP ' was prepared,the vertical assessment was not required by the SJCEHD California Health and Safety Code regulations (H&S 25295) require the assessment and continual monitoring of the vertical- margin dissolved hydrocarbons Additional evaluation of soil and ground water below 30 feet bsg ' is required to documented concentrations of dissolved and adsorbed hydrocarbons, required for E mitigation and ultimately closure t50 RECOMMENDATIONS _ 1 hia r ' Based upon data collected during third quarter 2003, AGE recommends • Continued ground water monitoring events at the site, however, collection of ground water ' samples from wells MW-1 through MW-9 (deeper screened monitoring wells) should be alternated between monitoring events with shallow screened wells VW-1 through.VW-9 • In accordance with California Underground Storage Tank Regulations, Article 5, Section ; ' • 2655, free-phase petroleum product should be monitored and mitigated immediately If additional petroleum product is encountered during the monitoring, than manual bailing ' activities should commence until the product is no,longer visible' Monitoring of VW-1 should be continued until free-phase floating petroleum product is no longer encountered Free-phase petroleum product should also be monitored for at well EW-1;due to the previous ' detection of product at this well t ' A work plan addendum,for four (4) cone penetrometer testing soil borings were submitted to the ' SJCEHD on 18 June 2003 and approved by the SJCEHD by letter on 25 September 2003,(Figure 2) AGE has tentatively scheduled CPT field work to commence on 03 February 2004 , 1 I 4 M e 6 0. + LIMITATIONS r r 1 Our professional services were performed using that degree of care and skill ordinarily exercised by -environmental consultants practicing in'this or similar localities The findings were based upon , analytical results provided by an,independent laboratory Evaluation of the hydrogeologic conditions ' N ` at the site for the purpose of this investigation was made from review of previous consultants reports and al limited number, of available data points' (field` meters and ground water samples) and ' subsurface`conditioris+may vary away from these data points ,Nol, other warranty, expressed or implied, is made as to the professional interpretations,opinions and recommendationsicontamed in this report I E ' Advanced Geo Environmental,Inc s 3 r 1 3