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L N April 6 , 2023 To : San Joaquin County Community Development Subject : Alternative Parking Plan Rationale 1735 Mariposa Road , Stockton The design shown on the proposed site plan includes a small concrete area between the buildings for ADA parking and travel between the two structures . The remaining area inside the fencing is proposed to be a compacted gravel surface with a lignin treatment to be maintained to eliminate dust travelling onto any adjacent roadways . There will be 2 concrete aprons to provide access from Pock Lane that extend 20 feet within the Property Line per 9 -406 - 080 g ( 6 ) . In order to protect the ground water level and preserve the natural drainage as much as possible , the proposed gravel surfacing will provide for the stated desire of providing " a similar material sufficient thickness and consistency to support anticipated traffic volumes and weights , properly graded for drainage , and maintained in good condition . " ( 9 -406 . 100 3 ( e ) . Based on California Green Building Standards Code A4 . 106 . 4 , permeable paving should be utilized for parking , walking or patio surfaces where not less than 30 % of total parking shall be permeable . Additionally, the EPA recommends LID ( low impact development ) that " employs principles such as preserving and recreating natural landscape features , minimizing effective imperviousness to create functional and appealing site drainage that treat stormwater as a resource rather than a waste product . " The proposed gravel surface will aid in minimizing effective imperviousness . After clearing and grubbing the site , the existing top 6 " will be scarified and mixed with concrete and be compacted to a minimum of 90 % . A minimum of 4 " layer of Class 2 Karen Reiss Engineering CA License #C 61524 400 Del Antico Ave #276 , Oakley CA 94561 ( 510) 909- 3169 ksreisspe@gmail . com 1