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� v SOIL SUITABILITY STUDY REPORT SITE LOCATION: PA#: 0900141 3552 West Yosemite Avenue, Lathrop Report Date: April 25,2010 1. INTRODUCTION& PROPOSED DEVELOPMENT: This report is for the 3552 West Yosemite Avenue, Lathrop site. The main purposes is to change the occupancy of the existing residential house to commercial occupancy and add truck parking area. The truck parking area is the main development on this site of 1.5 acres. The parking area and driveway to have 2 inches of asphalt concrete over 6 inches of gravel over 80% compacted base. A site plane drawing is attached showing vicinity map, existing structure, driveway, well, septic system, retention basin and parking area etc. 2. PRESENT AND PAST USES OF THE SITE: In the past, the site was used as an agricultural orchard. In 1978, a house was constructed and since then untill now, it was used as a residence. Now, it is proposed to be developed for truck parking use. 3. EXISTNG AND PROPOSED SEPTIC TANK USAGE: J The existing.septic system has a pre cast concrete septic tank with 1200 glalleons capacity, that has 5'x 9.2' x 5' size with 54 " liquid depth and two (2) compartments-11 as installed in 1978, permit no. 78-74 date issued 2-4-78. It has been and is functioning well on this site with sandy loam soil for the last 32 years without any repairs. As a matter of fact, the septic systems work well in this neighborhood due to the sandy loam soil and very little use due to trucking businesses in this area of Light Industrial Zoning. The copy of the Permit No. 78-74 is attached herewith for information. The proposed truck parking uses will have less inflow than exiting residential use. In the truck parking, the drivers park their ticks and leave the site as soon as possible. There are no future plans proposed or expected to increase the septic tank use in this Light Industrial Zone site. 4. GROUNWATER INFORMATION: The groundwater in the area is good. The depth of the groundwater fluctuates from 20' to 50; / depth depends on weather and rains in area. There is!one well ok site that was constructed in 1978 under Permit No. 78-266 dated 2-22-78. The copy of this permit is attached herewith. On this site of,3552�-West Yosemite Avenue, APN"# 241-400-08, the well water analyses was performed on 4-19-10 for E: Coli, Nitriles and 1,2-Dibromo-3-chloropropane and 1,2- Dibromoethene{El) % . Chain of Custody as well as the result of analyses are attached herewith for information. 1