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cnowolmy September 12, 2019 FOR: San Joaquin County Environmental Health Department (EHD) 1868 Hazelton Ave. Stockton, CA 95205 PROJECT: Wat Dhammararam Heaven Temple Project 3732 East Carpenter Road Stockton, California 95215 APN: 179-160-50, SR0080912 SUBJECT: Soil Suitability/Nitrate Loading Studies Report Addendum RECEIVED SEP 1 � 2019 ENVIRONMENTAL HEALTH PERMIT/SERVICES Reference is made to the Studies I completed for the project referenced above and the comments letter received from EHD found in Appendix D. The first question raised is in regards to the Precipitation Data in Table 4, Page 5. The Soil Survey Table 1: Temperature and Precipitation Chart is found in Appendix A. There is an "Average" column in the Precipitation category. The "Average" Precipitation column totals 14.19 inches, the "Less Than" column totals 8.3 inches and the "More Than" column totals 18.92 inches. While it is true the "More Than" column totals 23.47 and not 18.92, this is because when the differences between the "More Than" months (as listed) and the "Average" months are determined, this is added back to the "Average" totals, then the real total is found; the same for the "Less Than" column. This number (18.92 inches) is used just to demonstrate that the rainfall can be significantly higher than the average. The comment was made from Paragraph 2: "The average precipitation values should be used in the nitrate loading analysis instead of the "2 years in 10 value listed in Table 4." I did use the "average precipitation values" in the nitrate loading analysis. The San Joaquin County Department of Public Works Isohyetal Map of Mean Annual Precipitation (Appendix B) and the Soil Survey: Figure 3: The average annual precipitation, in inches, San Joaquin County (Appendix C) both illustrate that the average annual precipitation at the project site is actually around 13.5 inches per year; but I used 13.0 inches, which is more conservative. The comment from Paragraph 3: The Estimated Recharge Value. The CIMIS value referenced is invalid. The Manteca CIMIS monitoring station is almost 10 miles to the south and in an area with an average rainfall of 11 inches. I give several presentations a year through the University of California on irrigation and the use of CIMIS, and I discuss in detail the use of a station which must be carefully analyzed when it is not in close proximity to a subject acreage. The author of "Attachment 1" states that "Note that the key difference is expressing the recharge factors (wastewater and rainfall percolation) in acre-feet per year (AFY), rather thaninches per ygar averaged over the development -recharge area." But they are equivalent! AFY volume is the same as cu ft/yr volume; with cu ft/yr units reduced to in/yr. Page 1 of 3 Y.C. 2ax 3794 + J a�da&, CQ 95381 + (20) 4C2-1652 + dd he6ne�oZ�e jtet