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aqua i <br /> scet&i.e <br /> ■ ,engineers Inc. <br /> July 7, 1998 <br /> Mr. James Tong <br /> Charter Properties <br /> 6601 Owens Drive, Suite 100 <br /> Pleasanton, CA 94588 <br /> SUBJECT: ASE PROPOSAL #98-141R <br /> SOIL ASSESSMENT <br /> 7750 Schulte Road <br /> Tracy, California <br /> Dear Mr. Tong: <br /> Aqua Science Engineers (ASE) has received a response from the San <br /> Joaquin County Public Health Services, Environmental Health Division <br /> (SJCPHS-EHD) to ASE's June 17, 1998 workplan for a subsurface soil <br /> assessment at the above-referenced site. The SJCPHS-EHD response (which <br /> is attached) requires additional work which is beyond the scope of work <br /> outlined in ASE's proposal 98-1,41. The changes in the scope of work a n d <br /> associated costs for the additional scope of work are presented below. <br /> 1 ) Groundwater sampling is required which will require use of a drill <br /> rig such as a Geoprobe. It will not be possible to drill this boring <br /> with a hand auger which was to be used with our original scope of <br /> work. The use of a Geoprobe will require an additional $600.00. <br /> 2) The SJCPHS-EHD is requiring two samples (one soil and one water) to <br /> be analyzed for methanol and ethanol by modified EPA Method <br /> 8015. The cost for these additional analyses are $375.00 on a two <br /> week turnaround time basis. <br /> 3) The SJCPHS-EHD is requiring soil samples be analyzed every 5-feet <br /> from 8-feet below ground surface (bgs) until groundwater is . <br /> encountered. They are also requiring a groundwater sample. The <br /> analyses in each of these "sets" of analyses will include total <br /> petroleum hydrocarbons as gasoline (TPH-G) by modified EPA <br /> Method 5030/8015, total petroleum hydrocarbons as diesel (TPH-D) <br /> by modified EPA Method 3510/8015, benzene, toluene, ethylbenzene <br /> 2411 Old Crow Canyon Rood, Suite 4, Son Ramon, CA 94583 • 925-820-9391 • Fox 925-837-4853 <br />